Pressure wave generation device

Abstract

According to the present invention, a pressure wave generation device, configured to generate a pressure wave by discharging a high-pressure gas generated in a high-pressure chamber from an outlet to the outside, includes a high-pressure gas container that defines the high-pressure chamber and has the discharge port for discharging the high-pressure gas along a first direction, a piston for opening or closing off a connection channel connecting the discharge port and an outlet, the piston extending along a second direction intersecting the first direction and having formed therein a through hole that passes through in the first direction, a piston housing container that houses the piston so as to be capable of reciprocating in the second direction, a gas fuel supply device that supplies a gas fuel to the high-pressure chamber, and an oxygen supply device that supplies oxygen gas to the high-pressure chamber. The gas fuel supply device includes a gas fuel tank in which the gas fuel is stored, a gas fuel line through which the gas fuel tank and the high-pressure gas container communicate, a gas fuel adjustment valve that is provided on the gas fuel line and that is capable of adjusting gas fuel pressure of the gas fuel flowing through the gas fuel line, and a gas fuel pressure measurement device that is provided on the gas fuel line closer to the high-pressure gas container than the gas fuel adjustment valve, and that measures the gas fuel pressure. The oxygen supply device includes an oxygen gas tank in which oxygen gas is stored, an oxygen line through which the oxygen gas tank and the high-pressure gas container communicate, an oxygen gas adjustment valve that is provided on the oxygen line and that is capable of adjusting oxygen gas pressure of the oxygen gas flowing through the oxygen line, and an oxygen gas pressure measurement device that is provided on the oxygen line closer to the high-pressure gas container than the oxygen gas adjustment valve, and that meas

Description

Pressure wave generator

[0001] The present disclosure relates to a pressure wave generator configured to generate a pressure wave by discharging high-pressure gas generated in a high-pressure chamber to the outside from a discharge port. This application claims priority based on Japanese Patent Application No. 2024-232682 filed with the Japan Patent Office on December 27, 2024, and incorporates the content thereof herein.

[0002] For example, Patent Document 1 discloses a pressure wave generator that generates high-pressure gas by supplying gas fuel and oxygen gas to a high-pressure chamber and then igniting them.

[0003] Japanese Patent No. 7153824

[0004] In this type of pressure wave generator, the pressure wave generated varies depending on the ratio (mixing ratio) of the amount of oxygen gas to the amount of gas fuel in the high-pressure chamber. However, since the pressure wave generator described in Patent Document 1 adjusts the amounts of gas fuel and oxygen gas supplied to the high-pressure chamber based on the atmospheric pressure in the high-pressure chamber, there is room for improvement in the accuracy of the mixing ratio, which is important for generating a desired pressure wave.

[0005] The present disclosure has been made in view of the above problems, and an object thereof is to provide a pressure wave generator capable of generating an arbitrary pressure wave.

[0006] To achieve the above objective, the pressure wave generating device according to the present disclosure is configured to generate a pressure wave by releasing high-pressure gas generated in a high-pressure chamber to the outside from an outlet, and comprises: a high-pressure gas container defining the high-pressure chamber and having an outlet for ejecting the high-pressure gas along a first direction; a piston for opening or closing a connecting passage connecting the outlet and the discharge port, the piston extending along a second direction intersecting the first direction and having a through hole formed therein that penetrates along the first direction; a piston housing container housing the piston so as to be able to reciprocate along the second direction; a gas fuel supply device for supplying gas fuel to the high-pressure chamber; and an oxygen supply device for supplying oxygen gas to the high-pressure chamber, wherein the gas fuel supply device is The oxygen supply device includes a gas fuel tank in which the gas fuel is stored, a gas fuel line connecting the gas fuel tank and the high-pressure gas container, a gas fuel control valve provided in the gas fuel line and capable of adjusting the gas fuel pressure of the gas fuel flowing through the gas fuel line, and a gas fuel pressure measuring device provided on the high-pressure gas container side of the gas fuel control valve in the gas fuel line and capable of measuring the gas fuel pressure. The oxygen supply device includes an oxygen gas tank in which oxygen gas is stored, an oxygen line connecting the oxygen gas tank and the high-pressure gas container, an oxygen gas control valve provided in the oxygen line and capable of adjusting the oxygen gas pressure of the oxygen gas flowing through the oxygen line, and an oxygen gas pressure measuring device provided on the high-pressure gas container side of the oxygen gas control valve in the oxygen line and capable of measuring the oxygen gas pressure.

[0007] According to the pressure wave generator of this disclosure, any pressure wave can be generated.

[0008] This figure schematically shows the configuration of a pressure wave generator according to one embodiment. This is a schematic functional block diagram of a control device according to one embodiment. This figure illustrates an example of the operation of a pressure wave generator according to one embodiment.

[0009] Hereinafter, a pressure wave generator according to an embodiment of the present disclosure will be described with reference to the drawings. Such an embodiment represents one aspect of the present disclosure and is not limiting to this disclosure, and can be modified at will within the scope of the technical idea of ​​the present disclosure.

[0010] The pressure wave generating device according to this disclosure is installed, for example, in a boiler attached to an incinerator, and is configured to generate a pressure wave by releasing high-pressure gas generated by igniting gas fuel in a high-pressure chamber to the outside through an outlet.

[0011] (Configuration) Figure 1 is a schematic diagram showing the configuration of a pressure wave generator 1 according to one embodiment. As shown in Figure 1, the pressure wave generator 1 includes a high-pressure gas container 2, a piston 4, a piston housing container 6, a gas fuel supply device 8, and an oxygen supply device 10. In the embodiment illustrated in Figure 1, the pressure wave generator 1 further includes a discharge nozzle 12, a first gas supply device 14, a second gas supply device 16, an ignition device 18, a pressure acquisition device 20, an opening degree acquisition device 70, and a control device 100.

[0012] The high-pressure gas container 2 defines a high-pressure chamber 3 inside. The high-pressure gas container 2 has a nozzle 5 for ejecting the high-pressure gas HG generated in the high-pressure chamber 3 along a first direction D1. In the embodiment illustrated in Figure 1, the high-pressure gas container 2 has a cylindrical shape and extends along the first direction D1. The nozzle 5 is formed at one end of the high-pressure gas container 2 on one side in the first direction D1. The high-pressure chamber 3 has a circular shape when viewed in cross-section in a direction perpendicular to the first direction D1.

[0013] In one embodiment, as illustrated in Figure 1, the high-pressure gas container 2 includes a diameter-reducing section 17 that reduces the inner diameter of the high-pressure chamber 3 to d1 as it approaches the nozzle 5 (one side in the first direction D1). The diameter of the nozzle 5 is d1, and the inner diameter of the high-pressure chamber 3 is maintained at d1 from one end of the diameter-reducing section 17 on the nozzle 5 side to the nozzle 5. The high-pressure gas container 2 has a gas fuel supply hole 22 and an oxygen supply hole 24 that penetrate from the outer wall surface to the high-pressure chamber 3. One end of the high-pressure gas container 2 on one side in the first direction D1 is connected to the piston housing container 6. The high-pressure gas container 2, the piston housing container 6, and the discharge nozzle 12 are integrally constructed as a single component. In some embodiments, the high-pressure gas container 2, the piston housing container 6, and the discharge nozzle 12 are each separate components.

[0014] The piston 4 opens or closes a connecting passage 9 that connects the nozzle 5 and the outlet 7 for releasing high-pressure gas HG to the outside. The piston 4 extends along a second direction D2 that intersects the first direction D1. The piston 4 has a through hole 21 that penetrates the piston 4 along the first direction D1. In this disclosure, the second direction D2 is perpendicular to the first direction D1.

[0015] In one embodiment, the piston 4 has a cylindrical shape. The through-hole 21 of the piston 4 has a circular shape when viewed in a cross-sectional view taken in a direction perpendicular to the first direction D1 (second direction D2). The diameter of the through-hole 21 is the same as the diameter of the nozzle 5. In the first embodiment, the diameter of the through-hole 21 is configured to be the same throughout the entire first direction D1, but the disclosure is not limited to this embodiment.

[0016] The discharge nozzle 12 has a cylindrical shape with both ends open and extends along a first direction D1. The discharge nozzle 12 has a discharge port 7 formed at one end on one side of the first direction D1 and an inlet 19 formed at the other end on the other side of the first direction D1. The other end of the discharge nozzle 12 on the other side of the first direction D1 is connected to the piston housing container 6. The discharge space 11 formed inside the discharge nozzle 12 has a circular shape when viewed in cross-section in a direction perpendicular to the first direction D1 (second direction D2). The discharge nozzle 12 includes an expanding portion 23 that widens the inner diameter of the discharge space 11 as it approaches the discharge port 7 (one side of the first direction D1). The inner diameter of the discharge space 11 of the discharge nozzle 12 is maintained from the end of the expanding portion 23 on the discharge port 7 side to the discharge port 7, and the discharge port 7 has a larger diameter than the nozzle outlet 5. The discharge nozzle 12 is located on the opposite side of the piston housing 6 from the high-pressure gas container 2 in the first direction D1. The centerline O2 of the discharge nozzle 12 is located on the centerline O1 of the high-pressure gas container 2.

[0017] In one embodiment, as illustrated in Figure 1, the connecting channel 9 includes a discharge space 11 of the discharge nozzle 12 and a flow space 15 located between one storage section 30 (described later) and the other storage section 32 (described later) of the storage space 13 formed inside the piston storage container 6.

[0018] The piston housing 6 houses the piston 4 so that it can reciprocate along the second direction D2. In one embodiment, the piston housing 6 has a cylindrical shape and extends along the second direction D2. The piston housing 6 has a storage space 13 formed inside. The storage space 13 has a circular shape in a cross-sectional view taken along the first direction D1. The piston housing 6 includes a one-side storage section 30 located on one side of the second direction D2 with respect to the connecting flow path 9, and a other-side storage section 32 located on the other side of the second direction D2 with respect to the connecting flow path 9.

[0019] One side storage section 30 and the other side storage section 32 are spaced apart from each other in the second direction D2, and a flow space 15 is formed between the one side storage section 30 and the other side storage section 32. The internal space 31 of the one side storage section 30 opens toward the other side in the second direction D2 and communicates with the flow space 15. The internal space 33 of the other side storage section 32 opens toward one side in the second direction D2 and communicates with the flow space 15. In other words, the storage space 13 includes, in order from one side in the second direction D2, the internal space 31 of the one side storage section 30, the flow space 15, and the internal space 33 of the other side storage section 32.

[0020] One side storage section 30 includes an end wall 38 having an opposing surface 36 that faces one end face 34 on one side of the piston 4 in the second direction D2. The end wall 38 has a first gas flow hole 35 that penetrates the end wall 38 along the second direction D2. The other side storage section 32 includes an end wall 46 having an opposing surface 44 that faces the other end face 42 on the other side of the piston 4 in the second direction D2. The end wall 46 has a second gas flow hole 37 that penetrates the end wall 46 along the second direction D2.

[0021] The first gas supply device 14 supplies the first gas G1 to the internal space 31 of the one-side storage section 30 via the first gas flow hole 35. In one embodiment, as illustrated in Figure 1, the first gas supply device 14 includes a first gas tank 50 in which the first gas G1 is stored, a first gas line 52 connecting the first gas tank 50 and the one-side storage section 30 of the piston storage container 6, and a first gas valve 54 provided in the first gas line 52. The first gas valve 54 is, for example, a solenoid valve electrically connected to a control device 100, and is closed or opened according to instructions transmitted from the control device 100. When the first gas valve 54 is opened, the first gas G1 is supplied to the internal space 31 of the one-side storage section 30.

[0022] In one embodiment, as illustrated in Figure 1, the pressure wave generator 1 further includes a first pressure relief line 72 connected to the portion of the first gas line 52 closer to the piston housing container 6 than the first gas valve 54, and a first pressure relief valve 74 provided in the first pressure relief line 72. The outlet of the first pressure relief line 72 (formed on the opposite side from the first gas line 52) opens, for example, to a discharge space 11. The first pressure relief valve 74 is, for example, a solenoid valve, which is opened or closed according to instructions transmitted from the control device 100. When the first pressure relief valve 74 is opened, the first gas G1 can be discharged from the internal space 31 of the one-side housing 30 to the discharge space 11.

[0023] The second gas supply device 16 supplies the second gas G2 to the internal space 33 of the other side storage section 32 via the second gas flow hole 37. In one embodiment, as illustrated in Figure 1, the second gas supply device 16 includes a second gas tank 56 in which the second gas G2 is stored, a second gas line 58 connecting the second gas tank 56 and the other side storage section 32 of the piston storage container 6, and a second gas valve 60 provided in the second gas line 58. The second gas valve 60 is, for example, a solenoid valve electrically connected to a control device 100, and is closed or opened according to instructions transmitted from the control device 100. When the second gas valve 60 is opened, the second gas G2 is supplied to the internal space 33 of the other side storage section 32.

[0024] In one embodiment, as illustrated in Figure 1, the pressure wave generator 1 further includes a second pressure relief line 76 connected to the portion of the second gas line 58 closer to the piston housing container 6 than the second gas valve 60, and a second pressure relief valve 78 provided on the second pressure relief line 76. The outlet of the second pressure relief line 76 (formed on the opposite side from the second gas line 58) opens, for example, to a discharge space 11. The second pressure relief valve 78 is, for example, a solenoid valve, which is opened or closed according to instructions transmitted from the control device 100. When the second pressure relief valve 78 is opened, the second gas G2 can be discharged from the internal space 33 of the other side housing 32 to the discharge space 11.

[0025] The first gas G1 and the second gas G2 may have the same components or different components. In one embodiment, each of the first gas G1 and the second gas G2 is a non-flammable gas, such as nitrogen gas.

[0026] In one embodiment, the piston 4 described above is configured to be housed in both the internal space 31 of the one-side housing 30 and the internal space 33 of the other-side housing 32. Therefore, the piston 4 moves along the second direction D2 in accordance with the pressure difference ΔP between the air pressure in the internal space 31 of the one-side housing 30 and the air pressure in the internal space 33 of the other-side housing 32.

[0027] The piston 4 is pressed by the differential pressure ΔP generated by the supply of the first gas G1 and the second gas G2, and moves along the second direction D2. When the through hole 21 aligns with the connecting passage 9 due to the movement of the piston 4, the connecting passage 9 is opened. On the other hand, if the through hole 21 does not align with the connecting passage 9, the connecting passage 9 is blocked. In this disclosure, the opening degree of the connecting passage 9 is defined as 0% when the connecting passage 9 is blocked by the piston 4, and 100% when the flow rate of the high-pressure gas HG flowing through the connecting passage 9 is at its maximum while the connecting passage 9 is open by the piston 4. The 100% opening state refers, for example, to the state where the center line of the connecting passage 9 and the center line of the through hole 21 overlap each other. However, this disclosure is not limited to the state where the 100% opening state refers to the state where the center line of the connecting passage 9 and the center line of the through hole 21 overlap each other. The 100% opening state refers to a state in which the portion of the flow space 15 that opens to the nozzle 5 is not blocked at all by the piston 4 and is completely open.

[0028] In one embodiment, as illustrated in Figure 1, the length L1 of the second direction D2 from the other end face 42 of the piston 4 to the through hole 21 is equal to, or nearly equal to, the length L2 of the internal space 33 of the other side storage section 32 in the second direction D2. With this configuration, when the opening of the connecting passage 9 reaches 100%, if the air pressure in the internal space 31 of the one side storage section 30 is greater than the air pressure in the internal space 33 of the other side storage section 32, the other end face 42 of the piston 4 will come into contact with the opposing surface 44 of the other end wall 46. As a result, the movement of the piston 4 toward the other side in the second direction D2 is restricted, and the opening of the connecting passage 9 can be maintained at 100%.

[0029] The opening degree acquisition device 70 acquires the opening degree of the connecting passage 9. The opening degree acquisition device 70 is, for example, a pressure sensor or pressure sensor supported on one end face 34 of the piston 4 and which acquires the atmospheric pressure in the internal space 31 of the one-side housing 30. The pressure sensor is electrically connected to the control device 100 and transmits the value of the atmospheric pressure in the internal space 31 of the one-side housing 30 to the control device 100. However, this disclosure does not limit the opening degree acquisition device 70 to a pressure sensor. The opening degree acquisition device 70 may be, for example, a position sensor that detects the position of the piston 4. Furthermore, the installation location of the opening degree acquisition device 70 can be anywhere as long as the opening degree of the connecting passage 9 or the position of the piston 4 can be measured, and it may be installed on the side of the piston housing container 6 or on the side of the piston 4. One example of such a location is a magnetic sensor or an optical sensor. In addition, by providing multiple detection points for the opening degree acquisition device 70, the position of the piston 4 can be determined more accurately, and more detailed adjustment of the ignition timing becomes possible. In some embodiments, the opening degree acquisition device 70 includes a pressure sensor or pressure sensor that acquires the air pressure in the internal space 33 of the other side storage section 32.

[0030] The gas fuel supply device 8 supplies gas fuel F to the high-pressure chamber 3. As shown in Figure 1, the gas fuel supply device 8 includes a gas fuel tank 80 in which the gas fuel F is stored, a gas fuel line 82 connecting the gas fuel tank 80 and the high-pressure gas container 2, a gas fuel control valve 84 provided in the gas fuel line 82, and a gas fuel pressure measuring device 86 provided on the high-pressure gas container 2 side of the gas fuel control valve 84 in the gas fuel line 82. The gas fuel control valve 84 is configured to adjust the gas fuel pressure PF of the gas fuel F flowing through the gas fuel line 82 toward the high-pressure chamber 3. Specifically, the gas fuel control valve 84 is a pressure reducing valve and adjusts the gas fuel pressure PF by reducing it according to instructions transmitted from the control device 100. The gas fuel pressure measuring device 86 measures the gas fuel pressure PF. In other words, the gas fuel pressure measuring device 86 measures the gas fuel pressure PF of the gas fuel F on the high-pressure gas container 2 side in the direction of gas fuel F flow (the direction in which the gas fuel line 82 extends toward the high-pressure gas container 2) from the gas fuel control valve 84.

[0031] In one embodiment, as illustrated in Figure 1, the gas fuel supply device 8 further includes a gas fuel valve 88 located on the high-pressure gas container 2 side of the gas fuel control valve 84 in the gas fuel line 82, and a gas fuel check valve 89 located on the high-pressure gas container 2 side of the gas fuel pressure measuring device 86. The gas fuel valve 88 is configured to be switchable between allowing gas fuel F to flow toward the high-pressure chamber 3 or not. Specifically, the gas fuel valve 88 is a solenoid valve and is closed or opened according to instructions transmitted from the control device 100. When the gas fuel valve 88 is opened, gas fuel F is supplied to the high-pressure chamber 3. The gas fuel check valve 89 is configured to allow flow only from the gas fuel tank 80 toward the high-pressure chamber 3.

[0032] The oxygen supply device 10 supplies oxygen gas O to the high-pressure chamber 3. As shown in Figure 1, the oxygen supply device 10 includes an oxygen gas tank 90 in which oxygen gas O is stored, an oxygen line 92 connecting the oxygen gas tank 90 and the high-pressure gas container 2, an oxygen gas regulating valve 94 provided in the oxygen line 92, and an oxygen gas pressure measuring device 96 provided on the high-pressure gas container 2 side of the oxygen gas regulating valve 94 in the oxygen line 92. The oxygen gas regulating valve 94 is configured to adjust the oxygen gas pressure PO of the oxygen gas O flowing through the oxygen line 92 toward the high-pressure chamber 3. Specifically, the oxygen gas regulating valve 94 is a pressure reducing valve and adjusts the oxygen gas pressure PO by reducing it according to instructions transmitted from the control device 100. The oxygen gas pressure measuring device 96 measures the oxygen gas pressure PO. In other words, the oxygen gas pressure measuring device 96 measures the oxygen gas pressure PO of the oxygen gas O on the high-pressure gas container 2 side in the direction of oxygen gas O flow (the direction in which the oxygen line 92 extends toward the high-pressure gas container 2) more accurately than the oxygen gas control valve 94.

[0033] In one embodiment, as illustrated in Figure 1, the oxygen supply device 10 further includes an oxygen valve 98 located on the high-pressure gas container 2 side of the oxygen gas regulating valve 94 of the oxygen line 92, and an oxygen gas check valve 99 located on the high-pressure gas container 2 side of the oxygen gas pressure measuring device 96. The oxygen valve 98 is configured to be switchable between allowing oxygen gas O to flow toward the high-pressure chamber 3 or not. Specifically, the oxygen valve 98 is a solenoid valve and is opened or closed according to instructions transmitted from the control device 100. When the oxygen valve 98 is opened, oxygen gas O is supplied to the high-pressure chamber 3. The oxygen gas check valve 99 is configured to allow flow only from the oxygen gas tank 90 toward the high-pressure chamber 3.

[0034] The ignition device 18 ignites the gas fuel F supplied to the high-pressure chamber 3. The ignition device 18 includes, for example, a spark plug 62 located in the high-pressure chamber 3, and ignites the gas fuel F in the high-pressure chamber 3 by discharging a spark from the spark plug 62, thereby generating high-pressure gas HG. In one embodiment, the ignition device 18 is electrically connected to a control device 100, which will be described later, and performs the ignition operation according to instructions transmitted from the control device 100.

[0035] The pressure acquisition device 20 acquires the atmospheric pressure inside the high-pressure chamber 3. The pressure acquisition device 20 transmits the acquired atmospheric pressure value inside the high-pressure chamber 3 (hereinafter referred to as high-pressure chamber pressure PX) to the control device 100.

[0036] The control device 100 is a controller such as an electronic control device or a computer, and includes a processor such as a CPU or GPU (not shown), memory such as ROM or RAM, and an I / O interface. The control device 100 realizes each of its functional units by having the processor operate (calculate, etc.) according to the instructions of a program loaded into memory. In some embodiments, the control device 100 is connected to a cloud located in a remote cloud environment and includes communication equipment for exchanging operation data and control data. The connection to the cloud system may be directly from the control device 100, or it may be via the control device of the main equipment such as a boiler in which the pressure wave generator 1 is installed.

[0037] As illustrated in Figure 1, the control device 100 is electrically connected to the gas fuel control valve 84 (p1), the gas fuel valve 88 (p2), the oxygen gas control valve 94 (p3), and the oxygen valve 98 (p4), and instructs the timing of the ignition operation. The control device 100 is electrically connected to the pressure acquisition device 20 (p5), the gas fuel pressure measuring device 86 (p6), and the oxygen gas pressure measuring device 96 (p7), and acquires the high-pressure room pressure PX, gas fuel pressure PF, and oxygen gas pressure PO, respectively. The control device 100 is electrically connected to the ignition device 18 (p8) and instructs the ignition device 18 on the timing to perform the ignition operation. Although not shown, the control device 100 is also electrically connected to the first gas valve 54, the second gas valve 60, the first pressure relief valve 74, and the second pressure relief valve 78, and instructs the opening and closing timings. Although not shown, the control device 100 is electrically connected to the opening degree acquisition device 70, and calculates the opening degree of the connecting channel 9 from the value transmitted from the opening degree acquisition device 70.

[0038] The control device 100 supplies both gas fuel F and oxygen gas O to the high-pressure chamber 3 by controlling the gas fuel control valve 84, the gas fuel valve 88, the oxygen gas control valve 94, and the oxygen valve 98, respectively. Figure 2 is a schematic functional block diagram of the control device 100 according to one embodiment. As shown in Figure 2, the control device 100 includes a gas fuel supply unit 102, an oxygen gas supply unit 104, a gas fuel pressure adjustment unit 106, an oxygen gas pressure adjustment unit 108, a gas fuel injection unit 110, and an oxygen gas injection unit 112.

[0039] The gas fuel supply unit 102 sets the gas fuel valve 88 to open and the oxygen valve 98 to closed in a gas fuel supply state. In other words, the gas fuel supply state is one in which gas fuel F is supplied to the high-pressure chamber 3 but oxygen gas O is not supplied. The oxygen gas supply unit 104 sets the gas fuel valve 88 to closed and the oxygen valve 98 to open in an oxygen gas supply state. In other words, the oxygen gas supply state is one in which oxygen gas O is supplied to the high-pressure chamber 3 but gas fuel F is not supplied.

[0040] As illustrated in Figure 3, the gas fuel pressure adjustment unit 106 adjusts the valve opening of the gas fuel adjustment valve 84 so that when the gas fuel is supplied, the gas fuel pressure PF becomes a gas fuel set pressure PFy that is greater than the gas fuel target pressure PFx, which corresponds to the target amount of gas fuel F supplied to the high-pressure chamber 3. The oxygen gas pressure adjustment unit 108 adjusts the valve opening of the oxygen gas adjustment valve 94 so that when the oxygen gas is supplied, the oxygen gas pressure PO becomes an oxygen gas set pressure POy that is greater than the oxygen gas target pressure POx, which corresponds to the target amount of oxygen gas O supplied to the high-pressure chamber 3. The gas fuel target pressure PFx and the gas fuel set pressure PFy may each be preset values. The gas fuel set pressure PFy may be calculated by a predetermined method (for example, gas fuel target pressure PFx × 1.2) once the gas fuel target pressure PFx is determined. Similarly, the oxygen gas target pressure POx and the oxygen gas set pressure POy may each be preset values. The oxygen gas set pressure POy may be calculated by a predetermined method (for example, oxygen gas target pressure POx × 1.2) once the oxygen gas target pressure POx has been determined.

[0041] In one embodiment, each of the gas fuel target pressure PFx and the oxygen gas target pressure POx is set such that the mixing ratio of the gas fuel F and the oxygen gas O becomes the theoretical mixing ratio. For example, when the gas fuel F is methane gas, the gas fuel target pressure PFx and the oxygen gas target pressure POx are each set such that the amount of oxygen contained in the high-pressure chamber 3 becomes twice the amount of methane. Note that complete combustion is expected during theoretical mixing ratio ignition combustion, and in practical use, this includes adding a certain excess ratio to this oxygen amount (twice the amount of methane).

[0042] When the gas fuel pressure PF is set to the gas fuel set pressure PFy, the time until the high-pressure chamber pressure PX (the atmospheric pressure in the high-pressure chamber 3) becomes the gas fuel target pressure PFx is defined as the first time t1. Similarly, when the oxygen gas pressure PO is set to the oxygen gas set pressure POy, the time until the high-pressure chamber pressure PX (the atmospheric pressure in the high-pressure chamber 3) becomes the oxygen gas target pressure POx is defined as the second time t2. Each of the first time t1 and the second time t2 is predetermined.

[0043] In some embodiments, the first time t1 is determined in consideration of the amount of the gas fuel F supplied from the timing T1 (the timing when the gas fuel supply state is started), which will be described later, to the timing T2 (the timing when the gas fuel pressure PF becomes the gas fuel set pressure PFy). In some embodiments, the second time t2 is determined in consideration of the amount of the oxygen gas O supplied from the timing T3 (the timing when the oxygen gas supply state is started), which will be described later, to the timing T4 (the timing when the oxygen gas pressure PO becomes the oxygen gas set pressure POy).

[0044] The gas fuel injection unit 110 closes the gas fuel valve 88 based on a comparison between the elapsed time since the gas fuel pressure PF became the gas fuel set pressure PFy and the first time t1. The oxygen gas injection unit 112 closes the oxygen valve 98 based on a comparison between the elapsed time since the oxygen gas pressure PO became the oxygen gas set pressure POy and the second time t2.

[0045] An example of the operation of the pressure wave generator 1 including the above-described control device 100 will be described. FIG. 3 is a diagram for explaining an example of the operation of the pressure wave generator 1 according to an embodiment, and is a graph in which the horizontal axis represents time and the vertical axis represents pressure. In FIG. 3, the high-pressure chamber pressure PX is illustrated by a solid line, and each of the gas fuel pressure PF and the oxygen gas pressure PO is illustrated by a dotted line.

[0046] Timing T1 is the timing when the gas fuel supply state is started. When the gas fuel supply state is started by the gas fuel supply unit 102, the gas fuel F flows from the gas fuel tank 80 through the gas fuel line 82 and is supplied to the high-pressure chamber 3. For this reason, both the high-pressure chamber pressure PX and the gas fuel pressure PF increase. The gas fuel pressure PF is adjusted by the gas fuel pressure adjustment unit 106 and rises to the gas fuel set pressure PFy at timing T2, and is maintained at the gas fuel set pressure PFy.

[0047] The elapsed time from timing T2 is compared with the first time t1 by the gas fuel injection unit 110, and when the elapsed time reaches the first time t1, the gas fuel valve 88 is closed. That is, the supply of the gas fuel F to the high-pressure chamber 3 is stopped.

[0048] Timing T3 is the timing when the high-pressure chamber pressure PX reaches the gas fuel target pressure PFx. That is, it is the timing when the amount of the gas fuel F supplied to the high-pressure chamber 3 reaches the target amount. When timing T3 is reached (when the high-pressure chamber pressure PX acquired by the atmospheric pressure acquisition device 20 reaches the gas fuel target pressure PFx), the oxygen gas supply state is started by the oxygen gas supply unit 104, and the oxygen gas O flows from the oxygen gas tank 90 through the oxygen line 92 and is supplied to the high-pressure chamber 3. At this time, the oxygen gas target pressure POx is larger than the gas fuel target pressure PFx. For this reason, both the high-pressure chamber pressure PX and the oxygen gas pressure PO increase. The oxygen gas pressure PO is adjusted by the oxygen gas pressure adjustment unit 108 and rises to the oxygen gas set pressure POy, and is maintained at the oxygen gas set pressure POy. Incidentally, the high-pressure chamber pressure PX is maintained at the gas fuel set pressure PFy until the oxygen gas pressure PO exceeds the gas fuel target pressure PFx.

[0049] The oxygen gas injection unit 112 compares the elapsed time from timing T4 with the second time t2, and when the elapsed time reaches the second time t2, the oxygen valve 98 is closed. In other words, the supply of oxygen gas to the high-pressure chamber 3 is stopped.

[0050] Timing T5 is the moment when the high-pressure chamber pressure PX becomes the target oxygen gas pressure POx. In other words, it is the moment when the amount of oxygen gas O supplied to the high-pressure chamber 3 becomes the target amount. When timing T5 occurs, the oxygen valve 98 is closed as described above. Then, after timing T5, the control device 100 moves the piston 4 so that just before or when the opening of the connecting passage 9 becomes 0%, the ignition device 18 performs an ignition operation to generate high-pressure gas HG.

[0051] (Operation and Effects) The operation and effects of a pressure wave generator 1 according to one embodiment will be described. The pressure wave generated by the pressure wave generator 1 changes depending on the ratio (mixing ratio) of the amount of oxygen gas O to the amount of gas fuel F in the high-pressure chamber 3. According to one embodiment, a gas fuel control valve 84 and a gas fuel pressure measuring device 86 are provided in the gas fuel line 82, so gas fuel F can be supplied to the high-pressure chamber 3 while checking the gas fuel pressure PF. Similarly, an oxygen gas control valve 94 and an oxygen gas pressure measuring device 96 are provided in the oxygen line 92, so oxygen gas O can be supplied to the high-pressure chamber 3 while checking the oxygen gas pressure PO. As a result, the high-pressure chamber 3 is supplied with an amount of gas fuel F and oxygen gas O that results in a desired mixing ratio (for example, the amount of gas fuel F and the minimum amount of oxygen gas O theoretically required to completely combust this amount of gas fuel F), so any desired pressure wave can be generated.

[0052] According to one embodiment, since the gas fuel supply device 8 includes a gas fuel valve 88 and the oxygen supply device 10 includes an oxygen valve 98, when the supply of one of the gas fuel F and oxygen gas O to the high-pressure chamber 3 is stopped, the other of the gas fuel F and oxygen gas O can be supplied to the high-pressure chamber 3. This makes it easy to supply amounts of gas fuel F and oxygen gas O that result in a desired mixing ratio in the high-pressure chamber 3.

[0053] According to one embodiment, since the pressure wave generator 1 includes a control device 100, the valve opening of the gas fuel control valve 84 is automatically adjusted while checking the gas fuel pressure PF. Similarly, the valve opening of the oxygen gas control valve 94 is automatically adjusted while checking the oxygen gas pressure PO. As a result, the accuracy of supplying the amount of gas fuel F and oxygen gas O that results in the desired mixing ratio in the high-pressure chamber 3 can be improved. However, this disclosure is not limited to automatically adjusting the valve opening of the gas fuel control valve 84 and the oxygen gas control valve 94. An operator may check the gas fuel pressure PF and adjust the valve opening of the gas fuel control valve 84. Similarly, an operator may check the oxygen gas pressure PO and adjust the valve opening of the oxygen gas control valve 94. Furthermore, the valve openings of the gas fuel control valve 84 and the oxygen gas control valve 94 adjusted by the control device 100 or an operator may be fixed values ​​during operation, which is advantageous in that subsequent adjustments can be omitted.

[0054] According to one embodiment, since the target gas fuel pressure PFx and the target oxygen gas pressure POx are set to their theoretical mixing ratios, it is possible to generate a pressure wave that can exert the maximum effect. Alternatively, the target gas fuel pressure PFx and the target oxygen gas pressure POx may be set to their respective mixing ratios such that at least one of the acceleration and generated pressure of the pressure wave caused by the high-pressure gas HG is maximized.

[0055] According to one embodiment, the elapsed time from timing T2 is compared with the first time t1, and when the elapsed time reaches the first time t1 such that PX becomes the target gas fuel pressure PFx, the gas fuel valve 88 is closed. Similarly, the elapsed time from timing T4 is compared with the second time t2, and when the elapsed time reaches the second time t2 such that the high-pressure chamber pressure PX becomes the target oxygen gas pressure POx, the oxygen valve 98 is closed. Therefore, the accuracy of supplying gas fuel F and oxygen gas O can be improved so that the mixture ratio inside the high-pressure chamber 3 is as desired.

[0056] Furthermore, this disclosure is not limited to closing the gas fuel valve 88 when the elapsed time reaches the first hour t1. In some embodiments, the gas fuel injection unit 110 closes the gas fuel valve 88 based on the high-pressure chamber pressure PX acquired by the pressure acquisition device 20. The gas fuel injection unit 110 closes the gas fuel valve 88 if the high-pressure chamber pressure PX reaches the gas fuel target pressure PFx before the elapsed time reaches the first hour t1. The gas fuel injection unit 110 closes the gas fuel valve 88 if the elapsed time exceeds the first hour t1 and the high-pressure chamber pressure PX reaches the gas fuel target pressure PFx. With such a configuration, the gas fuel valve 88 is closed considering the first hour t1 and the high-pressure chamber pressure PX. Similarly, the oxygen valve 98 is closed considering the second hour t2 and the high-pressure chamber pressure PX. As a result, the accuracy of supplying gas fuel F and oxygen gas O can be further improved so that the mixture ratio inside the high-pressure chamber 3 is as desired.

[0057] According to one embodiment, the gas fuel supply device 8 includes a gas fuel check valve 89, and the oxygen supply device 10 includes an oxygen gas check valve 99, thereby suppressing the flow of high-pressure gas HG generated in the high-pressure chamber 3 through the gas fuel line 82 and the oxygen line 92. This suppresses damage to the gas fuel control valve 84, gas fuel pressure measuring device 86, and gas fuel valve 88 provided in the gas fuel line 82. Similarly, damage to the oxygen gas control valve 94, oxygen gas pressure measuring device 96, and oxygen valve 98 provided in the oxygen line 92 can be suppressed.

[0058] In one embodiment, gas fuel F was supplied to the high-pressure chamber 3 before oxygen gas O was supplied to the high-pressure chamber 3, but this disclosure is not limited to this configuration. Oxygen gas O may be supplied to the high-pressure chamber 3 before gas fuel F is supplied to the high-pressure chamber 3. Also, in one embodiment, the number of injections of gas fuel F and oxygen gas O was one (between T2 and T3 and between T4 and T5), but this disclosure is not limited to this configuration. The number of injections of gas fuel F may be multiple. The number of injections of oxygen gas O may be multiple.

[0059] The contents described in each of the above embodiments can be understood, for example, as follows:

[0060] [1] The pressure wave generating device (1) according to the present disclosure is a pressure wave generating device configured to generate a pressure wave by releasing high-pressure gas (HG) generated in a high-pressure chamber (3) to the outside from an outlet (7), comprising: a high-pressure gas container (2) that defines the high-pressure chamber and has an outlet (5) for ejecting the high-pressure gas along a first direction (D1); a piston (4) for opening or closing a connecting passage (9) connecting the outlet and the discharge port, the piston extending along a second direction (D2) intersecting the first direction and having a through hole (21) that penetrates along the first direction; a piston housing container (6) that houses the piston so as to be able to reciprocate along the second direction; a gas fuel supply device (8) for supplying gas fuel (F) to the high-pressure chamber; and an oxygen supply device (10) for supplying oxygen gas (O) to the high-pressure chamber, wherein the gas fuel supply device comprises a gas fuel tank (80) in which the gas fuel is stored, The oxygen supply device includes: a gas fuel line (82) connecting the gas fuel tank and the high-pressure gas container; a gas fuel control valve (84) provided in the gas fuel line and capable of adjusting the gas fuel pressure (PF) of the gas fuel flowing through the gas fuel line; and a gas fuel pressure measuring device (86) provided on the high-pressure gas container side of the gas fuel control valve in the gas fuel line and capable of measuring the gas fuel pressure. The oxygen supply device includes: an oxygen gas tank (90) in which oxygen gas is stored; an oxygen line (92) connecting the oxygen gas tank and the high-pressure gas container; an oxygen gas control valve (94) provided in the oxygen line and capable of adjusting the oxygen gas pressure (PO) of the oxygen gas flowing through the oxygen line; and an oxygen gas pressure measuring device (96) provided on the high-pressure gas container side of the oxygen gas control valve in the oxygen line and capable of measuring the oxygen gas pressure.

[0061] The pressure wave generator produces pressure waves that change depending on the ratio (mixing ratio) of oxygen gas to gas fuel in the high-pressure chamber. According to the configuration described in [1] above, a gas fuel pressure measuring device and a gas fuel control valve are provided in the gas fuel line, so gas fuel can be supplied to the high-pressure chamber while monitoring the gas fuel pressure. Similarly, an oxygen gas pressure measuring device and an oxygen gas control valve are provided in the oxygen line, so oxygen gas can be supplied to the high-pressure chamber while monitoring the oxygen gas pressure. Therefore, since the high-pressure chamber is supplied with an amount of gas fuel and oxygen gas that results in the desired mixing ratio (for example, the amount of gas fuel and the minimum amount of oxygen gas theoretically required to completely combust this amount of gas fuel), any desired pressure wave can be generated.

[0062] [2] In some embodiments, in the configuration described in [1] above, the gas fuel supply device further includes a gas fuel valve (88) provided on the high-pressure gas container side of the gas fuel line beyond the gas fuel control valve, which can switch whether or not to circulate the gas fuel toward the high-pressure chamber, and the oxygen supply device further includes an oxygen valve (98) provided on the high-pressure gas container side of the oxygen line beyond the oxygen gas control valve, which can switch whether or not to circulate the oxygen gas toward the high-pressure chamber.

[0063] According to the configuration described in [2] above, when the supply of one of the gas fuel or oxygen gas to the high-pressure chamber is stopped, the other of the gas fuel or oxygen gas can be supplied to the high-pressure chamber. This makes it easy to supply the amount of gas fuel and oxygen gas that results in the desired mixing ratio in the high-pressure chamber.

[0064] [3] In some embodiments, the configuration described in [2] above further comprises a control device (100) that controls the gas fuel valve, the oxygen valve, the gas fuel control valve, and the oxygen gas control valve, the control device comprising: a gas fuel supply unit (102) that brings the gas fuel valve into a gas fuel supply state in which the gas fuel valve is open and the oxygen valve is closed; an oxygen gas supply unit (104) that brings the gas fuel valve into an oxygen gas supply state in which the gas fuel valve is closed and the oxygen valve is open; and a gas fuel pressure adjustment unit (106) that adjusts the valve opening of the gas fuel control valve so that when the gas fuel supply state is in which the gas fuel pressure is greater than the gas fuel target pressure (PFx) corresponding to the target amount of gas fuel supplied to the high-pressure chamber, The system includes an oxygen gas pressure adjustment unit (108) that adjusts the valve opening of the oxygen gas adjustment valve so that, when the oxygen gas is supplied, the oxygen gas pressure becomes a set oxygen gas pressure (POy) that is greater than the target oxygen gas pressure (POx) corresponding to the target amount of oxygen gas supplied to the high-pressure chamber.

[0065] According to the configuration described in [3] above, the valve opening of the gas fuel control valve is adjusted while the gas fuel pressure is automatically monitored. Similarly, the valve opening of the oxygen gas control valve is adjusted while the oxygen gas pressure is automatically monitored. As a result, the accuracy of supplying the amount of gas fuel and oxygen gas that results in the desired mixture ratio in the high-pressure chamber can be improved.

[0066] [4] In some embodiments, in the configuration described in [3] above, the target gas fuel pressure and the target oxygen gas pressure are set such that the mixing ratio of the gas fuel and the oxygen gas is the theoretical mixing ratio.

[0067] According to the configuration described in [4] above, the mixing ratio in the high-pressure chamber becomes the theoretical mixing ratio, so it is possible to generate a pressure wave that can exert the maximum effect.

[0068] [5] In some embodiments, in the configuration described in [3] or [4] above, if the time until the atmospheric pressure (PX) in the high-pressure chamber reaches the target gas fuel pressure when the gas fuel pressure is set to the gas fuel set pressure is defined as the first time (t1), and if the time until the atmospheric pressure (PX) in the high-pressure chamber reaches the target oxygen gas pressure when the oxygen gas pressure is set to the oxygen gas set pressure is defined as the second time (t2), then the control device includes: a gas fuel injection unit (110) that closes the gas fuel valve based on a comparison of the elapsed time since the gas fuel pressure reached the gas fuel set pressure and the first time; and an oxygen gas injection unit (112) that closes the oxygen valve based on a comparison of the elapsed time since the oxygen gas pressure reached the oxygen gas set pressure and the second time.

[0069] According to the configuration described in [5] above, the gas fuel valve can be closed so that the atmospheric pressure in the high-pressure chamber becomes the target gas fuel pressure. Similarly, the oxygen valve can be closed so that the atmospheric pressure in the high-pressure chamber becomes the target oxygen gas pressure. Therefore, the accuracy of the supply of gas fuel and oxygen gas can be improved so that the high-pressure chamber has the desired mixing ratio.

[0070] [6] In some embodiments, the configuration described in [5] further includes a pressure acquisition device (20) for acquiring the pressure inside the high-pressure chamber, wherein the gas fuel injection unit closes the gas fuel valve based on the pressure inside the high-pressure chamber acquired by the pressure acquisition device, and the oxygen gas injection unit closes the oxygen valve based on the pressure inside the high-pressure chamber acquired by the pressure acquisition device.

[0071] According to the configuration described in [6] above, the gas fuel valve is closed considering the time (first hour) during which gas fuel is supplied to the high-pressure chamber and the atmospheric pressure inside the high-pressure chamber. Similarly, the oxygen valve is closed considering the time (second hour) during which oxygen gas is supplied to the high-pressure chamber and the atmospheric pressure inside the high-pressure chamber. Therefore, the accuracy of the supply of gas fuel and oxygen gas can be further improved so that the mixture ratio inside the high-pressure chamber is as desired.

[0072] [7] In some embodiments, in the configuration described in any one of [1] to [6] above, the gas fuel supply device further includes a gas fuel check valve (89) provided on the high-pressure gas container side of the gas fuel pressure measuring device, configured to allow only flow from the gas fuel tank toward the high-pressure chamber, and the oxygen supply device further includes an oxygen gas check valve (99) provided on the high-pressure gas container side of the oxygen gas pressure measuring device, configured to allow only flow from the oxygen gas tank toward the high-pressure chamber.

[0073] According to the configuration described in [7] above, damage to the gas fuel control valve, gas fuel pressure measuring device, oxygen gas control valve, and oxygen gas pressure measuring device can be suppressed.

[0074] [8] A pressure wave generating device according to the present disclosure is a pressure wave generating device configured to generate a pressure wave by releasing high-pressure gas generated in a high-pressure chamber to the outside from an outlet, comprising: a high-pressure gas container defining the high-pressure chamber and having an outlet for ejecting the high-pressure gas along a first direction; a gas fuel supply device for supplying gas fuel to the high-pressure chamber; and an oxygen supply device for supplying oxygen gas to the high-pressure chamber, wherein the gas fuel supply device includes a gas fuel control valve capable of adjusting the gas fuel pressure of the gas fuel flowing toward the high-pressure chamber, and a gas fuel pressure measuring device for measuring the gas fuel pressure of the gas fuel on the high-pressure gas container side in the flow direction of the gas fuel from the gas fuel control valve, and the oxygen supply device includes an oxygen gas control valve capable of adjusting the oxygen gas pressure of the oxygen gas flowing toward the high-pressure chamber, and an oxygen gas pressure measuring device for measuring the oxygen gas pressure of the oxygen gas on the high-pressure gas container side in the flow direction of the oxygen gas from the oxygen gas control valve.

[0075] The pressure wave generator produces pressure waves that change depending on the ratio (mixing ratio) of oxygen gas to gas fuel in the high-pressure chamber. According to the configuration described in [8] above, the gas fuel supply device includes a gas fuel pressure measuring device and a gas fuel control valve, so that gas fuel can be supplied to the high-pressure chamber while monitoring the gas fuel pressure. Similarly, since the oxygen supply device includes an oxygen gas pressure measuring device and an oxygen gas control valve, oxygen gas can be supplied to the high-pressure chamber while monitoring the oxygen gas pressure. Therefore, since the high-pressure chamber is supplied with an amount of gas fuel and oxygen gas that results in a desired mixing ratio (for example, the amount of gas fuel and the minimum amount of oxygen gas theoretically required to completely combust this amount of gas fuel), any desired pressure wave can be generated.

[0076] 1 Pressure wave generator 2 High-pressure gas container 3 High-pressure chamber 4 Piston 5 Nozzle 6 Piston housing container 7 Discharge port 8 Gas fuel supply device 9 Connecting flow path 10 Oxygen supply device 11 Discharge space 12 Discharge nozzle 13 Storage space 14 First gas supply device 15 Flow space 16 Second gas supply device 17 Diameter reduction section 18 Ignition device 19 Inlet 20 Pressure acquisition device 21 Through hole 22 Gas fuel supply hole 23 Diameter expansion section 24 Oxygen supply hole 30 One side storage section 31 Internal space of one side storage section 32 Other side storage section 33 Internal space of the other side storage section 34 One end face of the piston 35 First gas flow hole 36 Opposing surface of one end wall 37 Second gas flow hole 38 One end wall 42 Other end face of the piston 44 Opposing surface of the other end wall 46 Other end wall 50 First gas tank 52 First gas line 54 First gas valve 56 Second gas tank 58 Second gas line 60 Second gas valve 62 Spark plug 70 Opening degree acquisition device 72 First pressure relief line 74 First pressure relief valve 76 Second pressure relief line 78 Second pressure relief valve 80 Gas fuel tank 82 Gas fuel line 84 Gas fuel control valve 86 Gas fuel pressure measuring device 88 Gas fuel valve 89 Gas fuel check valve 90 Oxygen gas tank 92 Oxygen line 94 Oxygen gas control valve 96 Oxygen gas pressure measuring device 98 Oxygen valve 99 Oxygen gas check valve 100 Control device 102 Gas fuel supply unit 104 Oxygen gas supply unit 106 Gas fuel pressure adjustment unit 108 Oxygen gas pressure adjustment unit 110 Gas fuel injection unit 112 Oxygen gas injection section D1 First direction D2 Second direction F Gas fuel G1 First gas G2 Second gas HG High-pressure gas O Oxygen gas O1 Centerline of high-pressure gas container O2 Centerline of discharge nozzle PF Gas fuel pressure PFx Gas fuel target pressure PFy Gas fuel set pressure PO Ox Oxygen gas target pressure POy Oxygen gas set pressure PX High-pressure chamber pressure T1, T2, T3, T4, T5 Timing t1 First hour t2 Second hour

Claims

1. A pressure wave generating device configured to generate a pressure wave by releasing high-pressure gas generated in a high-pressure chamber to the outside from an outlet, comprising: a high-pressure gas container defining the high-pressure chamber and having an outlet for ejecting the high-pressure gas along a first direction; a piston for opening or closing a connecting passage connecting the outlet and the discharge port, the piston extending along a second direction intersecting the first direction and having a through hole formed therein that penetrates along the first direction; a piston housing container housing the piston so as to be able to reciprocate along the second direction; a gas fuel supply device for supplying gas fuel to the high-pressure chamber; and an oxygen supply device for supplying oxygen gas to the high-pressure chamber, wherein the gas fuel supply device comprises: a gas fuel tank for storing the gas fuel; a gas fuel line connecting the gas fuel tank and the high-pressure gas container; and a gas fuel control valve provided in the gas fuel line and capable of adjusting the gas fuel pressure of the gas fuel flowing through the gas fuel line. A pressure wave generator comprising: a gas fuel pressure measuring device provided on the high-pressure gas container side of the gas fuel control valve in the gas fuel line for measuring the gas fuel pressure, the oxygen supply device comprising: an oxygen gas tank in which the oxygen gas is stored; an oxygen line connecting the oxygen gas tank and the high-pressure gas container; an oxygen gas control valve provided on the oxygen line for adjusting the oxygen gas pressure of the oxygen gas flowing through the oxygen line; and an oxygen gas pressure measuring device provided on the high-pressure gas container side of the oxygen gas control valve in the oxygen line for measuring the oxygen gas pressure.

2. The pressure wave generating device according to claim 1, wherein the gas fuel supply device further includes a gas fuel valve provided on the high-pressure gas container side of the gas fuel control valve in the gas fuel line, and capable of switching whether or not to circulate the gas fuel toward the high-pressure chamber, and the oxygen supply device further includes an oxygen valve provided on the high-pressure gas container side of the oxygen gas control valve in the oxygen line, and capable of switching whether or not to circulate the oxygen gas toward the high-pressure chamber.

3. A pressure wave generator according to claim 2, further comprising a control device for controlling the gas fuel valve, the oxygen valve, the gas fuel control valve, and the oxygen gas control valve, wherein the control device includes: a gas fuel supply unit that puts the gas fuel valve into a gas fuel supply state in which the gas fuel valve is open and the oxygen valve is closed; an oxygen gas supply unit that puts the gas fuel valve into an oxygen gas supply state in which the gas fuel valve is closed and the oxygen valve is open; a gas fuel pressure adjustment unit that adjusts the valve opening of the gas fuel control valve so that when the gas fuel supply state is in place, the gas fuel pressure becomes a gas fuel set pressure greater than the gas fuel target pressure corresponding to the target amount of gas fuel supplied to the high-pressure chamber; and an oxygen gas pressure adjustment unit that adjusts the valve opening of the oxygen gas control valve so that when the oxygen gas supply state is in place, the oxygen gas pressure becomes an oxygen gas set pressure greater than the oxygen gas target pressure corresponding to the target amount of oxygen gas supplied to the high-pressure chamber.

4. The pressure wave generator according to claim 3, wherein the target gas fuel pressure and the target oxygen gas pressure are set such that the mixing ratio of the gas fuel and the oxygen gas is the theoretical mixing ratio.

5. The pressure wave generator according to claim 3 or 4, wherein, when the gas fuel pressure is set to the gas fuel set pressure, the time until the atmospheric pressure in the high-pressure chamber reaches the gas fuel target pressure is defined as the first time, and when the oxygen gas pressure is set to the oxygen gas set pressure, the time until the atmospheric pressure in the high-pressure chamber reaches the oxygen gas target pressure is defined as the second time, the control device includes: a gas fuel injection unit that closes the gas fuel valve based on a comparison of the elapsed time since the gas fuel pressure reached the gas fuel set pressure and the first time; and an oxygen gas injection unit that closes the oxygen valve based on a comparison of the elapsed time since the oxygen gas pressure reached the oxygen gas set pressure and the second time.

6. The pressure wave generator according to claim 5, further comprising a pressure acquisition device for acquiring the pressure inside the high-pressure chamber, wherein the gas fuel injection unit closes the gas fuel valve based on the pressure inside the high-pressure chamber acquired by the pressure acquisition device, and the oxygen gas injection unit closes the oxygen valve based on the pressure inside the high-pressure chamber acquired by the pressure acquisition device.

7. The pressure wave generating device according to any one of claims 1 to 4, wherein the gas fuel supply device further includes a gas fuel check valve provided on the high-pressure gas container side of the gas fuel pressure measuring device, configured to allow only flow from the gas fuel tank toward the high-pressure chamber, and the oxygen supply device further includes an oxygen gas check valve provided on the high-pressure gas container side of the oxygen gas pressure measuring device, configured to allow only flow from the oxygen gas tank toward the high-pressure chamber.

8. A pressure wave generating device configured to generate a pressure wave by releasing high-pressure gas generated in a high-pressure chamber to the outside from an outlet, comprising: a high-pressure gas container defining the high-pressure chamber and having an outlet for ejecting the high-pressure gas along a first direction; a gas fuel supply device for supplying gas fuel to the high-pressure chamber; and an oxygen supply device for supplying oxygen gas to the high-pressure chamber, wherein the gas fuel supply device includes a gas fuel control valve capable of adjusting the gas fuel pressure of the gas fuel flowing toward the high-pressure chamber, and a gas fuel pressure measuring device for measuring the gas fuel pressure of the gas fuel on the high-pressure gas container side in the direction of gas fuel flow from the gas fuel control valve; and the oxygen supply device includes an oxygen gas control valve capable of adjusting the oxygen gas pressure of the oxygen gas flowing toward the high-pressure chamber, and an oxygen gas pressure measuring device for measuring the oxygen gas pressure of the oxygen gas on the high-pressure gas container side in the direction of oxygen gas flow from the oxygen gas control valve.

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