Flow control and ignition coupled cavity combustion chamber ignition device and method

Abstract

The invention relates to a flow control and ignition coupled concave cavity combustion chamber ignition device and method.The upstream of a concave cavity combustion chamber is provided with a front body platform, the concave cavity combustion chamber ignition device comprises an exciter, an igniter, an ignition power source and a speed sensor, and the exciter is arranged on the side, close to the concave cavity combustion chamber, of the front body platform and comprises an electrode array; the ignition power source comprises a power source body, a first output port, a second output port and a control module, wherein the first output port, the second output port and the control module are arranged on the power source body. The electrode array is electrically connected with the first output port. The igniter is installed in the concave cavity combustion chamber and electrically connected with the second output port, and the control module is configured to control the first output port to output high voltage so as to break down the electrode array when an ignition signal is received, and control the second output port to output high voltage so as to drive the igniter to ignite at a preset time interval after the electrode array is broken down. According to the technical scheme, the cavity combustion chamber ignition device can efficiently and repeatedly ignite, and the ignition success rate is increased.

Description

Technical Field

[0001] The present disclosure relates to the technical field of ramjet engine ignition, and in particular to an ignition device and method for a cavity combustion chamber with flow control and ignition coupled. Background Art

[0002] Hypersonic vehicles, a strategic asset that nations are racing to develop, hold significant value in areas such as space transportation and military, and have become a technological highland in the aerospace sector. As the core power component of hypersonic vehicles, the performance of the ramjet engine directly determines the overall performance of the vehicle. The reentrant combustion chamber, with its significant advantages such as excellent flame stability, no excessive total pressure loss, and no added drag, has become the most widely used combustion chamber configuration in ramjets. However, ignition of the reentrant combustion chamber of a ramjet engine presents significant challenges. Due to the extremely high inlet velocity, the fuel residence time within the combustion chamber is extremely short, making successful ignition and stable combustion of the fuel within such a short time extremely difficult.

[0003] At present, in order to achieve reliable ignition under harsh engine operating conditions such as high speed, low temperature and low pressure, most ramjet engines use disposable high-energy pyrotechnic igniters. However, this igniter can only be used once, which makes the ramjet engine unable to meet the needs of repeated ignition, making it difficult to ignite the ramjet engine's concave cavity combustion chamber and the ignition success rate low. Summary of the Invention

[0004] The purpose of the present disclosure is to provide a concave cavity combustion chamber ignition device with coupled flow control and ignition, which can efficiently and repeatedly ignite and improve the ignition success rate.

[0005] In order to achieve the above-mentioned objectives, the present disclosure provides a concave cavity combustion chamber ignition device that couples flow control and ignition, wherein a precursor platform is provided upstream of the concave cavity combustion chamber, and the concave cavity combustion chamber ignition device includes an exciter, an igniter, an ignition power supply and a speed sensor, wherein the exciter is provided on a side of the precursor platform close to the concave cavity combustion chamber and includes an electrode array, the ignition power supply includes a power supply body and a first output port, a second output port and a control module provided on the power supply body, the electrode array is electrically connected to the first output port; the igniter is installed in the concave cavity combustion chamber and is electrically connected to the second output port, wherein the speed sensor is used to detect the incoming flow velocity of the concave cavity combustion chamber, and the control module is configured to: when receiving an ignition signal, control the first output port to output a high voltage to break down the electrode array, and control the second output port to output a high voltage after a preset time after the electrode array breaks down to drive the igniter to ignite.

[0006] Optionally, the electrode array includes two edge electrodes spaced apart along the span direction, and at least one intermediate electrode provided between the two edge electrodes, and the two edge electrodes are respectively connected to the positive and negative electrodes of the first output port through wires.

[0007] Optionally, the actuator further includes a ceramic substrate, which is detachably embedded in the precursor platform, and the electrode array is arranged on the ceramic substrate, and the upper surfaces of the electrode array, the ceramic substrate and the precursor platform are flush.

[0008] Optionally, an edge electrode hole is opened on the ceramic substrate, and the edge electrode hole is constructed as a circular stepped hole and includes a connected small diameter section and a large diameter section. The edge electrode is installed in the small diameter section, wherein the length of the edge electrode is greater than the depth of the small diameter section.

[0009] Optionally, the diameter of the small-diameter section is 0.5 mm to 5 mm, and the hole depth is 1 mm to 10 mm; the diameter of the large-diameter section is 1 mm to 5 mm, and the hole depth is 1 mm to 10 mm.

[0010] Optionally, an intermediate electrode groove is provided on the ceramic substrate, the intermediate electrode groove is configured as an elongated blind groove, and the intermediate electrode is installed in the intermediate electrode groove.

[0011] Optionally, the dimension of the intermediate electrode groove in the span direction is 1 mm to 10 mm; the dimension in the flow direction is 0.5 mm to 3 mm; and the depth of the intermediate electrode groove is 1 mm to 10 mm.

[0012] Optionally, there are two intermediate electrode slots, and the spacing between an intermediate electrode slot and an adjacent edge electrode hole, as well as the spacing between adjacent intermediate electrode slots, are both 0.5 mm to 5 mm.

[0013] Based on the above technical solutions, the present disclosure further provides a concave cavity combustion chamber ignition method with flow control and ignition coupled. The concave cavity combustion chamber ignition device with flow control and ignition coupled includes the following steps: The speed sensor detects the incoming flow speed of the cavity combustion chamber in real time V , the control module is based on the detected flow velocity V , and the distance between the igniter and the exciter L , automatically calculate the preset time Δ t , the calculation formula for the preset time is ; After receiving the ignition signal, the control module controls the ignition power supply to work. The first output port of the ignition power supply outputs a high voltage to break down the electrode array of the exciter, causing it to generate arc discharge and form a hot air mass. The breakdown moment of the electrode array is recorded as ; Interval preset time Δ t After that, the control module controls the second output port to output high voltage to drive the igniter to ignite. The ignition time is recorded as t ,but ,exist t The hot air mass moves with the incoming flow to the top of the igniter at all times, so that the area above the igniter forms a high-temperature and low-speed zone; Repeat the above steps according to the ignition frequency of the engine until stable combustion is established in the cavity combustion chamber and ignition is completed.

[0014] Optionally, the operating frequency of the exciter is the same as the ignition frequency of the igniter.

[0015] Through the above technical solution, the present disclosure provides a cavity combustion chamber ignition device with coupled flow control and ignition, including an exciter, an igniter, and an ignition power supply. The exciter includes an electrode array, and the ignition power supply includes a control module. After receiving an ignition signal, the control module first controls the first output port to output a high voltage to break down the electrode array, causing an arc discharge and forming a hot air mass, thereby improving the airflow and temperature conditions in the ignition area. After a preset time interval, the control module then controls the second output port to output a high voltage to drive the igniter to ignite. In this way, through the coordinated operation of the exciter and igniter, the coupling of flow control and ignition is achieved, greatly improving the ignition success rate of the cavity combustion chamber. In addition, the present disclosure strictly controls the operating time of the exciter and igniter to ensure that the igniter is turned on when the hot air mass moves with the incoming flow to the downstream ignition area, so that the hot air mass and the igniter ignition are perfectly coordinated in time and space, further improving the reliability of ignition.

[0016] In addition, the present disclosure belongs to an electric ignition method, which can achieve multiple repeatable ignitions and is suitable for the ignition requirements of reusable scramjet engines.

[0017] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 Schematic diagram of the structure of a cavity combustion chamber ignition device with flow control and ignition coupled according to an embodiment of the present disclosure; Figure 2 is an exploded view of a cavity combustion chamber ignition device coupled with flow control and ignition provided by an embodiment of the present disclosure; Figure 3is a schematic structural diagram of a ceramic substrate provided by an embodiment of the present disclosure; Figure 4 is a cross-sectional view of a ceramic substrate provided by an embodiment of the present disclosure; Figure 5 is another structural schematic diagram of a ceramic substrate provided by an embodiment of the present disclosure; Figure 6 yes Figure 5 Schematic diagram of arc discharge between the edge electrode and the middle electrode at A; Figure 7 This is a state diagram of the concave cavity combustion chamber provided by an embodiment of the present disclosure when ignited. At this time, the electrode array generates arc discharge and forms a hot gas mass; Figure 8 This is another state diagram of the concave cavity combustion chamber provided by the embodiment of the present disclosure when ignited. At this time, the hot air mass moves downstream with the incoming flow and is located upstream of the igniter; Figure 9 This is another state diagram of the concave cavity combustion chamber provided by the embodiment of the present disclosure when ignited. At this time, the hot air mass is located directly above the igniter; Figure 10 This is another state diagram of the concave cavity combustion chamber provided by the embodiment of the present disclosure when ignited. At this time, the hot air mass forms an initial fire core in the recirculation zone of the concave cavity combustion chamber; Figure 11 This is a state diagram of the concave cavity combustion chamber provided by the embodiment of the present disclosure when ignition is successful.

[0019] Explanation of the accompanying symbols: 1. Concave cavity combustion chamber; 2. Precursor platform; 3. Exciter; 31. Edge electrode; 32. Intermediate electrode; 33. Ceramic substrate; 331. Edge electrode hole; 3311. Small diameter section; 3312. Large diameter section; 332. Intermediate electrode groove; 34. Mounting hole; 4. Ignitor; 5. Ignition power supply; 51. First output port; 52. Second output port; 6. Hot air mass; 7. Electric arc; 8. Initial fire core. DETAILED DESCRIPTION

[0020] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0021] In this disclosure, unless otherwise stated, the terms “flow direction” and “span direction” are respectively Figure 1 The X and Y directions in the figure, where “flow direction” also represents the incoming flow direction of the cavity combustion chamber 1, and “depth” corresponds to Figure 1In the Z direction. In addition, the terms "first," "second," and the like used in this disclosure are intended to distinguish one element from another and do not have a sequential or importance relationship. In the following description, when referring to the drawings, unless otherwise indicated, the same reference numerals in different drawings represent the same or similar elements. The above definitions are intended only to explain and illustrate this disclosure and should not be construed as limiting this disclosure.

[0022] According to an exemplary embodiment of the present disclosure, referring to Figure 1 and Figure 2 As shown, a concave cavity combustion chamber ignition device with flow control and ignition coupling is provided, a precursor platform 2 is provided upstream of the concave cavity combustion chamber 1, the concave cavity combustion chamber ignition device includes an exciter 3, an igniter 4, an ignition power supply 5 and a speed sensor, the exciter 3 is provided on the side of the precursor platform 2 close to the concave cavity combustion chamber 1 and includes an electrode array, the ignition power supply 5 includes a power supply body and a first output port 51, a second output port 52 and a control module provided on the power supply body, the electrode array is electrically connected to the first output port 51; the igniter 4 is installed in the concave cavity combustion chamber 1 and is electrically connected to the second output port 52, wherein the speed sensor is used to detect the incoming flow velocity of the concave cavity combustion chamber 1, and the control module is configured to: when receiving the ignition signal, control the first output port 51 to output a high voltage to break down the electrode array, and control the second output port 52 to output a high voltage after a preset time after the electrode array breaks down to drive the igniter 4 to ignite.

[0023] Through the above technical solution, the present disclosure provides a cavity combustion chamber ignition device with coupled flow control and ignition, including an exciter 3, an igniter 4, and an ignition power supply 5. The exciter 3 includes an electrode array, and the ignition power supply 5 includes a control module. After receiving an ignition signal, the control module first controls the first output port 51 to output a high voltage to break down the electrode array, causing an arc discharge and forming a hot air mass 6, thereby improving the airflow and temperature conditions in the ignition area. After a preset time interval, the control module then controls the second output port 52 to output a high voltage to drive the igniter 4 to ignite. In this way, through the coordinated operation of the exciter 3 and the igniter 4, the coupling of flow control and ignition is achieved, greatly improving the ignition success rate of the cavity combustion chamber 1. In addition, the present disclosure strictly controls the operating time of the exciter 3 and the igniter 4 to ensure that the igniter 4 is activated when the hot air mass 6 moves with the incoming flow to the downstream ignition area, so that the ignition of the hot air mass 6 and the igniter 4 are perfectly coordinated in time and space, further improving the reliability of ignition.

[0024] In addition, the present disclosure belongs to an electric ignition method, which can achieve multiple repeatable ignitions and is suitable for the ignition requirements of reusable scramjet engines.

[0025] In the present disclosure, the breakdown of the electrode array can be interpreted as the air between two adjacent electrodes being broken down to generate an arc, the arc resistance is very small, and the arc acts as a conductor to connect the adjacent electrodes in pairs, thereby forming a loop for the entire circuit; Figure 1 As shown, the front body platform 2 is a flat plate structure with a wedge-shaped leading edge and a square trailing edge, and the leading edge wedge angle of the front body platform 2 is 30°; the concave cavity combustion chamber 1 is a concave cavity, the leading edge of the concave cavity combustion chamber 1 is square, the trailing edge tail is inclined, and the inclination angle is 45°, and a circular hole can be opened at the bottom of the concave cavity combustion chamber 1 for installing the igniter 4; a rear body platform for closing the concave cavity combustion chamber 1 is provided downstream of the concave cavity combustion chamber 1.

[0026] According to an exemplary embodiment of the present disclosure, referring to Figure 2 and Figure 5 As shown, the electrode array includes two edge electrodes 31 spaced apart along the span direction, and at least one intermediate electrode 32 disposed between the two edge electrodes 31. The two edge electrodes 31 are connected to the positive and negative electrodes of the first output port 51 via wires. The intermediate electrode 32 plays a role in discharge continuity during the operation of the exciter 3, and is used to distribute the total discharge gap that can be broken down by the ignition power supply 5 intermittently to the entire discharge area, as shown in FIG. Figure 6 As shown; the electric field distribution between the electrodes can be made more reasonable by the intermediate electrode 32, and it is easier to generate a stable arc 7 with appropriate strength under the action of high voltage; through the electrode array arranged at intervals along the span direction, a wider arc 7 action area can be generated in the span direction, which is conducive to the formation of a larger range of hot air mass 6.

[0027] According to an exemplary embodiment of the present disclosure, referring to Figure 1 and Figure 2 As shown, the actuator 3 further includes a ceramic substrate 33, which is detachably embedded in the precursor platform 2. The electrode array is arranged on the ceramic substrate 33, and the upper surfaces of the electrode array, the ceramic substrate 33 and the precursor platform 2 are flush. Figure 3 As shown, a square notch can be opened at the rear edge of the precursor platform 2, and at least two mounting holes 34 can be opened on the ceramic substrate 33. In this way, after the ceramic substrate 33 is embedded in the square notch, the ceramic substrate 33 is fixedly connected to the precursor platform 2 through screws and the mounting holes 34. When the electrode array is damaged or needs to be replaced, the ceramic substrate 33 and the electrode array thereon can be easily replaced.

[0028] In the present disclosure, the ceramic substrate 33 can be a square ceramic block made of alumina or other insulating high-temperature resistant ceramics, which has good insulation and high-temperature resistance, can provide a stable supporting environment for the electrode array, withstand the high temperature generated by arc discharge, and ensure the long-term stable operation of the exciter 3; the upper surfaces of the electrode array, the ceramic substrate 33 and the precursor platform 2 are flush, which can ensure that the airflow flows smoothly on the surface of the precursor platform 2, avoid additional airflow disturbances caused by surface unevenness, and ensure that the hot air mass 6 generated by the exciter 3 can move as expected and accurately reach the ignition area. According to the exemplary embodiment of the present disclosure, refer to Figure 3 and Figure 4 As shown, the ceramic substrate 33 is provided with an edge electrode hole 331. This hole is a circular stepped hole and comprises a connected small-diameter section 3311 and a large-diameter section 3312. The edge electrode 31 is mounted in the small-diameter section 3311. The length of the edge electrode 31 is greater than the depth of the small-diameter section 3311. In the above technical solution, the small-diameter section 3311 is used to mount the edge electrode 31, positioning and securing the electrode. The large-diameter section 3312 accommodates the wire connection portion, preventing the wire from being directly exposed to airflow, reducing airflow impact and wear on the wire, and extending the wire's service life.

[0029] According to an exemplary embodiment of the present disclosure, the diameter of the small diameter section 3311 is 0.5 mm to 5 mm. For example, the diameter of the small diameter section 3311 can be 0.5 mm, 1 mm, or 5 mm. The hole depth of the small diameter section 3311 is 1 mm to 10 mm. For example, the hole depth of the small diameter section 3311 can be 1 mm, 3 mm, or 10 mm. The diameter of the large diameter section 3312 is 1 mm to 5 mm, and the hole depth is 1 mm to 10 mm. For example, the diameter of the large diameter section 3312 can be 1 mm, 3 mm, or 5 mm, and the hole depth of the large diameter section 3312 can be 1 mm, 3 mm, or 10 mm. By limiting the size of the edge electrode hole 331, the edge electrode hole 331 can match the common size of the edge electrode 31, ensuring that the edge electrode 31 is securely installed while providing sufficient space for wire connection, thereby avoiding installation difficulties or unstable operation due to improper size. In addition, the appropriate pore diameter and pore depth can make the electric field distribution around the electrode more reasonable, making it easier to break through the air to generate the arc 7 under the action of high voltage, and can maintain the stability of the arc 7 to a certain extent.

[0030] According to an exemplary embodiment of the present disclosure, referring to Figure 4As shown, the ceramic substrate 33 is provided with an intermediate electrode slot 332, which is constructed as an elongated blind slot. The intermediate electrode 32 is mounted in the intermediate electrode slot 332. The elongated blind slot structure effectively positions and secures the intermediate electrode 32, preventing displacement or dislodging due to airflow impact or vibration, thereby ensuring the stability of the electrode array structure. Furthermore, the blind slot design reduces direct airflow impact on the intermediate electrode 32, while preventing contamination and damage to the electrode from external impurities, thereby extending the service life of the intermediate electrode 32.

[0031] According to an exemplary embodiment of the present disclosure, the intermediate electrode groove 332 has a spanwise dimension of 1 mm to 10 mm, and illustratively, the spanwise dimension of the intermediate electrode groove 332 can be 1 mm, 6 mm, or 10 mm. The intermediate electrode groove 332 has a flowwise dimension of 0.5 mm to 3 mm, and illustratively, the flowwise dimension of the intermediate electrode groove 332 can be 0.5 mm, 1 mm, or 3 mm. The intermediate electrode groove 332 has a depth of 1 mm to 10 mm, and illustratively, the depth of the intermediate electrode groove 332 can be 1 mm, 3 mm, or 10 mm. This size range allows for a more reasonable arrangement of the intermediate electrode 32 in the spanwise and flowwise directions, forming a good fit with the intermediate electrode 32, and ensuring uniform distribution of the arc 7 generated by the electrode array.

[0032] According to an exemplary embodiment of the present disclosure, referring to Figure 2 and Figure 4 As shown, there are two intermediate electrode slots 332. The spacing between an intermediate electrode slot 332 and an adjacent edge electrode hole 331, as well as the spacing between adjacent intermediate electrode slots 332, is 0.5 mm to 5 mm. For example, it can be 0.5 mm, 3 mm, or 5 mm. The appropriate spacing between adjacent components can promote a more coordinated interaction between the edge electrode 31 and the intermediate electrode 32, avoiding insufficient arc 7 strength due to excessive spacing or unnecessary interference caused by too small spacing, thereby ensuring the overall operating efficiency of the exciter 3.

[0033] In this disclosure, reference is made to Figure 5 and Figure 6 As shown, the number of arc discharges = the number of intermediate electrode slots 332 + 1. The length of the spanwise discharge area is illustrated below by taking the number of intermediate electrode slots 332 as two examples. The spanwise length of the intermediate electrode slots 332 can be 6 mm, the width in the flow direction can be 1 mm, and the depth can be 3 mm. The diameter of the small-diameter section 3311 of the edge electrode hole 331 is 1 mm and the depth is 3 mm, and the diameter of the large-diameter section 3312 is 3 mm and the depth is 3 mm. The spanwise electrode spacing is 3 mm, and the spanwise discharge area length is 23 mm.

[0034] Based on the above technical solutions, the present disclosure further provides a concave cavity combustion chamber ignition method with flow control and ignition coupled. The concave cavity combustion chamber ignition device with flow control and ignition coupled includes the following steps: The speed sensor detects the incoming flow speed of the cavity combustion chamber 1 in real time V , the control module is based on the detected flow velocity V , and the distance between the igniter 4 and the exciter 3 L , automatically calculate the preset time Δ t , the calculation formula for the preset time is ; After receiving the ignition signal, the control module controls the ignition power supply 5 to work. The first output port 51 of the ignition power supply 5 outputs a high voltage to break down the electrode array of the exciter 3, causing it to generate arc discharge and form a hot air mass 6. The breakdown moment of the electrode array is recorded as ,like Figure 7 Status shown; Interval preset time Δ t After that, the control module controls the second output port 52 to output a high voltage to drive the igniter 4 to ignite. The ignition time is recorded as t ,but ,exist t At this moment, the hot air mass 6 moves with the incoming flow to the top of the igniter 4, so that the area above the igniter 4 forms a high-temperature and low-speed area, such as Figure 9 Status shown; The above steps are repeated according to the ignition frequency of the engine until stable combustion is established in the cavity combustion chamber 1 and ignition is completed.

[0035] According to an exemplary embodiment of the present disclosure, the operating frequency of the exciter 3 is the same as the ignition frequency of the igniter 4 .

[0036] In the above technical solution, by real-time detection of the incoming flow velocity and calculation of the preset time, the ignition timing can be adjusted as the incoming flow velocity changes, ensuring that the hot air mass 6 always reaches the top of the igniter 4 at the ignition moment, adapting to the ignition requirements under different operating conditions and improving the adaptability of the method. The high-temperature, low-speed zone formed by the hot air mass 6, on the one hand, increases the ignition temperature of the fuel and reduces the difficulty of ignition; on the other hand, it creates a low-speed environment suitable for ignition, greatly improving the ignition success rate. Furthermore, the above-mentioned ignition method disclosed herein can be repeated according to the engine ignition frequency, continuously strengthening the combustion state within the concave cavity combustion chamber 1, gradually forming a stable flame, avoiding the flame extinction problem that may occur with a single ignition, and ensuring combustion stability.

[0037] In the present disclosure, the igniter 4 can be a typical aircraft engine spark igniter or a plasma jet igniter. The following uses the plasma jet igniter as an example to describe the use process of the cavity combustion chamber ignition device with flow control and ignition coupled in the present disclosure. Details are as follows: The speed sensor detects the incoming flow speed at the inlet of the cavity combustion chamber 1 in real time V , assuming the detected incoming flow velocity V The distance between the igniter 4 and the exciter 3 is 680㎧. L is 40mm, the control module is based on the formula , calculate the preset time Δ t =58.8㎲, where V represents the incoming flow velocity of the cavity combustion chamber 1; L Represents the distance between the igniter 4 and the exciter 3; Δ t Represents the time interval after the first output port 51 outputs a high voltage that breaks down the electrode array; After receiving the ignition signal from the engine control system, the control module immediately controls the first output port 51 to output a high voltage, such as a high voltage of 10 kV. The high voltage is applied to the two edge electrodes 31. As the air between the edge electrode 31 and the middle electrode 32 is broken down, an arc discharge is generated. The arc discharge instantly releases a large amount of energy, causing the surrounding air to heat up and expand rapidly, forming a hot air mass 6. Figure 7 In the state shown, the temperature of the hot air mass 6 is about 1500K, and this moment is recorded as ; The hot air mass 6 moves downstream along with the incoming flow, such as Figure 8 Status shown; After the electrode array breaks down, at a preset time interval of 58.8㎲, the control module controls the second output port 52 to output a high voltage, driving the plasma jet igniter 4 to generate sparks for ignition. At this time, the hot air mass 6 moves just above the plasma jet igniter 4 under the drive of the incoming flow. Figure 9 As shown, the air flow velocity in this area is reduced, forming a high-temperature and low-speed area, which provides favorable conditions for ignition; After ignition, the hot air mass 6 will continue to move downstream, and an initial fire core 8 will be formed in the recirculation zone in the cavity combustion chamber 1. Figure 10 Status shown; The ignition frequency of the engine is the same as the operating frequency of the exciter 3. According to the above steps, the excitation and ignition operations can be repeated every 0.1s. After continuous ignition, the fuel in the concave cavity combustion chamber 1 is fully burned to form a stable flame. At this time, the ignition is completed. Figure 11 Status shown.

[0038] In summary, the use of the concave cavity combustion chamber ignition device and method with flow control and ignition coupling disclosed in the present invention can achieve efficient and reliable ignition in more severe environments (such as low temperature, low pressure, high speed, etc.), and the discharge frequency required by this application is the same as the ignition frequency, which reduces the ignition frequency, requires less energy, and can share the ignition power supply 5 with the ignition system; since the discharge frequency required by this application is low and consistent with the ignition frequency, the ablation of the electrode array is very small, and it has the same service life as the igniter 4. In addition, the exciter 3 of this application has a simple structure, and only a simple modification of the existing engine is required to achieve the function of efficient and repeatable ignition, and it has strong engineering application capabilities.

[0039] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0040] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0041] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A concave cavity combustion chamber ignition device with flow control and ignition coupled, wherein a precursor platform (2) is provided upstream of the concave cavity combustion chamber (1), characterized in that: The concave cavity combustion chamber ignition device includes an exciter (3), an igniter (4), an ignition power supply (5) and a speed sensor, wherein the exciter (3) is arranged on a side of the precursor platform (2) close to the concave cavity combustion chamber (1) and includes an electrode array, the ignition power supply (5) includes a power supply body and a first output port (51), a second output port (52) and a control module arranged on the power supply body, the electrode array is electrically connected to the first output port (51); the igniter (4) is installed in the concave cavity combustion chamber (1) and is electrically connected to the second output port (52), wherein the speed sensor is used to detect the incoming flow speed of the concave cavity combustion chamber (1), and the control module is configured to: when receiving an ignition signal, control the first output port (51) to output a high voltage to break down the electrode array, and when a preset time interval passes after the electrode array breaks down, control the second output port (52) to output a high voltage to drive the igniter (4) to ignite.

2. The ignition device for a cavity combustion chamber coupled with flow control and ignition according to claim 1, characterized in that: The electrode array comprises two edge electrodes (31) spaced apart along the span direction, and at least one intermediate electrode (32) disposed between the two edge electrodes (31), the two edge electrodes (31) being connected to the positive and negative electrodes of the first output port (51) respectively via wires.

3. The ignition device for a cavity combustion chamber coupled with flow control and ignition according to claim 2, characterized in that: The actuator (3) further comprises a ceramic substrate (33), wherein the ceramic substrate (33) is detachably embedded in the precursor platform (2), the electrode array is arranged on the ceramic substrate (33), and the upper surfaces of the electrode array, the ceramic substrate (33) and the precursor platform (2) are flush.

4. The ignition device for a cavity combustion chamber coupled with flow control and ignition according to claim 3, characterized in that: An edge electrode hole (331) is provided on the ceramic substrate (33), the edge electrode hole (331) being constructed as a circular stepped hole and comprising a connected small-diameter section (3311) and a large-diameter section (3312), the edge electrode (31) being mounted on the small-diameter section (3311), wherein the length of the edge electrode (31) is greater than the depth of the small-diameter section (3311).

5. The ignition device for a cavity combustion chamber coupled with flow control and ignition according to claim 4, characterized in that: The diameter of the small diameter section (3311) is 0.5 mm to 5 mm, and the hole depth is 1 mm to 10 mm; the diameter of the large diameter section (3312) is 1 mm to 5 mm, and the hole depth is 1 mm to 10 mm.

6. The ignition device for a concave cavity combustion chamber coupled with flow control and ignition according to claim 4 or 5, characterized in that: An intermediate electrode groove (332) is provided on the ceramic substrate (33), the intermediate electrode groove (332) being constructed as a long blind groove, and the intermediate electrode (32) is mounted in the intermediate electrode groove (332).

7. The ignition device for a cavity combustion chamber coupled with flow control and ignition according to claim 6, characterized in that: The dimension of the intermediate electrode groove (332) in the span direction is 1 mm to 10 mm; the dimension in the flow direction is 0.5 mm to 3 mm; and the depth of the intermediate electrode groove (332) is 1 mm to 10 mm.

8. The ignition device for a cavity combustion chamber coupled with flow control and ignition according to claim 7, characterized in that: The number of the intermediate electrode slots (332) is two, and the spacing between the intermediate electrode slots (332) and the adjacent edge electrode holes (331), as well as the spacing between adjacent intermediate electrode slots (332), are both 0.5 mm to 5 mm.

9. A concave cavity combustion chamber ignition method with coupled flow control and ignition, based on the concave cavity combustion chamber ignition device with coupled flow control and ignition according to any one of claims 1 to 8, characterized in that: The following steps are involved: The velocity sensor detects the incoming flow velocity of the cavity combustion chamber (1) in real time V , the control module is based on the detected flow velocity V , and the distance between the igniter (4) and the exciter (3) L , automatically calculate the preset time Δ t , the calculation formula for the preset time is ; After receiving the ignition signal, the control module controls the ignition power supply (5) to work. The first output port (51) of the ignition power supply (5) outputs a high voltage to break down the electrode array of the exciter (3), causing it to generate arc discharge and form a hot gas mass (6). The breakdown moment of the electrode array is recorded as ; Interval preset time Δ t After that, the control module controls the second output port (52) to output a high voltage to drive the igniter (4) to ignite. The ignition time is recorded as t ,but ,exist t At this moment, the hot air mass (6) moves with the incoming flow to above the igniter (4), so that the area above the igniter (4) forms a high-temperature and low-speed zone; The above steps are repeated according to the ignition frequency of the engine until stable combustion is established in the concave cavity combustion chamber (1) and ignition is completed.

10. The ignition method for a cavity combustion chamber with coupled flow control and ignition according to claim 9, characterized in that: The operating frequency of the exciter (3) is the same as the ignition frequency of the igniter (4).

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