Testing system for generating squeeze flow to strengthen ammonia combustion equipment

Abstract

The invention discloses a test system for generating squish flow to strengthen ammonia combustion equipment. The test system comprises a first volume bomb body, a second volume bomb body and a squish flow regulation and control unit, the squeeze flow regulation and control unit comprises a membrane breaking mechanism and a flow guide plate; the membrane breaking mechanism is used for controlling a membrane breaking threshold value through an ejector pin with an adjustable distance and a membrane, and puncturing the membrane through the ejector pin under the action of high-pressure airflow of the first shell accommodating body, so that the first shell accommodating body generates extrusion flow towards the second shell accommodating body; and the flow guide plate is used for adjusting the extrusion flow direction. The high-pressure airflow generated by pre-combustion of the first containing bomb body serves as a squish flow power source, controllable squish flow is generated to the second containing bomb body through the squish flow regulation and control unit, an ammonia gas combustion test is carried out in the second containing bomb body, the strengthening effect of the squish flow on ammonia combustion is quantified, and the device has the advantage of being high in controllability.

Description

Technical Field

[0001] The invention relates to a test system for generating squeeze flow enhanced ammonia combustion equipment, belonging to the technical field of ammonia combustion. Background Art

[0002] Ammonia has a high auto-ignition temperature and a low laminar flame speed, and its combustion needs to be enhanced by the squish effect. It has become a hot research direction in the combustion characteristics of carbon-neutral fuels. For example, the Chinese invention patent with publication number CN119412252A discloses an ammonia fuel high-pressure injection and ignition system, and specifically discloses an ammonia injection module including a camshaft, an ammonia fuel common rail, a first purge valve, a second purge valve, an ammonia fuel electronically controlled single pump and a dual-fuel injector; a diesel combined high-pressure oil pump, a diesel common rail and an injection module of the dual-fuel injector; when the camshaft rotates, it drives the ammonia fuel electronically controlled single pump to deliver pressurized ammonia fuel into the ammonia fuel common rail, and the high-pressure ammonia fuel in the ammonia fuel common rail is injected into the combustion chamber of the internal combustion engine through the ammonia injection module of the dual-fuel injector; after the internal combustion engine is shut down, the first purge valve is used to pass purge gas into the ammonia fuel common rail, and the residual ammonia fuel in the ammonia fuel common rail is discharged from the second purge valve together with the purge gas; the diesel combined high-pressure oil pump delivers pressurized diesel into the diesel common rail, and then injects it into the combustion chamber of the internal combustion engine through the injection module of the dual-fuel injector to ignite the ammonia fuel. This system uses a dual-fuel injector module to inject fuel into the combustion chamber of an internal combustion engine to ignite ammonia fuel. However, these systems often use actual engine power and emissions performance indicators to measure ammonia combustion characteristics, making it difficult to quantify the effect of varying squish flow intensities on ammonia combustion. Therefore, designing a test system to study the effects of squish flow on ammonia combustion enhancement and dynamic characteristic parameters such as the heat release rate has become a research topic in the industry. Summary of the Invention

[0003] The present invention aims to provide a testing system for squish flow-enhanced ammonia combustion equipment. This system uses pre-combustion in a first bomb to generate a high-pressure airflow as a squish flow power source. This system then generates a controllable squish flow to a second bomb via a squish flow control unit. This system conducts ammonia combustion tests in the second bomb, quantifying the squish flow's enhancement effect on ammonia combustion. This system offers the advantage of high controllability.

[0004] The technical solution of the present invention is a test system for a device for producing squeeze flow-enhanced ammonia combustion, comprising: The first bomb body is used to generate high-pressure airflow as a squeeze flow power source through fuel pre-combustion; The second bomb is used to conduct ammonia combustion tests under controlled squish flow conditions; A squeeze flow control unit connects the first elastic body and the second elastic body; the squeeze flow control unit includes a membrane rupture mechanism and a guide plate; the membrane rupture mechanism controls the membrane rupture threshold through a pin and a diaphragm with adjustable spacing, and punctures the diaphragm through the pin under the action of the high-pressure airflow of the first elastic body, so that the first elastic body generates a squeeze flow toward the second elastic body; the guide plate is used to adjust the direction of the squeeze flow.

[0005] The above-mentioned test system for generating squeeze flow enhanced ammonia combustion equipment, the membrane rupturing mechanism includes a membrane rupturing mechanism main body whose two ends are respectively connected to the first elastic body and the second elastic body, and the two ends of the membrane rupturing mechanism main body are respectively provided with a first side film and a second side film, the first side film is provided with a first side ejector pin on the side close to the membrane rupturing mechanism main body, and the second side film is provided with a second side ejector pin on the side close to the second elastic body; the tip of the first side ejector pin faces the first side film; the tip of the second side ejector pin faces the second side film; windows are provided on the first elastic body, the second elastic body and the membrane rupturing mechanism main body; a first igniter is provided inside the first elastic body; a second igniter is provided inside the second elastic body; the guide plate is provided between the membrane rupturing mechanism main body and the second elastic body; the left side of the first side film is fixedly connected to the first compression nut; the left side of the second side film is fixedly connected to the second compression nut.

[0006] The aforementioned test system for generating a squeeze flow enhanced ammonia combustion device further includes: An imaging mechanism, wherein the shooting end thereof is respectively aimed at the windows on the first bomb container, the second bomb container, and the membrane rupturing mechanism body; the imaging mechanism is used to capture the internal images of the first bomb container, the second bomb container, and the membrane rupturing mechanism during the test; A data acquisition mechanism is provided in the first bomb container and the second bomb container; the data acquisition mechanism is used to collect data of the first bomb container and the second bomb container during testing; The synchronous trigger controller is connected to the imaging mechanism and the data acquisition mechanism via lines respectively; the synchronous trigger controller is connected to the computer via lines; the synchronous trigger controller is used to ensure that the imaging mechanism and the data acquisition mechanism synchronously collect images and data after ignition.

[0007] The aforementioned test system for the squeeze flow enhanced ammonia combustion equipment, the imaging mechanism includes a first Z-type Schlieren imaging system, a third high-speed camera and a second Z-type Schlieren imaging system; the first Z-type Schlieren imaging system corresponds to the window of the first bomb body; the shooting end of the third high-speed camera corresponds to the window of the membrane rupture mechanism; the second Z-type Schlieren imaging system corresponds to the window of the second bomb body.

[0008] The aforementioned test system for the squeezing flow enhanced ammonia combustion equipment, the first Z-type Schlieren imaging system includes a first Schlieren light source, a first Schlieren slit, a first Schlieren system plane mirror and a second Schlieren system concave mirror arranged outside the first bomb window on one side, and a first Schlieren system concave mirror, a second Schlieren system plane mirror, a first Schlieren knife edge and a first high-speed camera arranged outside the first bomb window on the other side; the light emitted by the first Schlieren light source passes through the first Schlieren slit, the first Schlieren system plane mirror and the second Schlieren system concave mirror in sequence to illuminate the interior of the first bomb, and the first high-speed camera photographs the internal situation of the first bomb through the first Schlieren knife edge, the second Schlieren system plane mirror and the first Schlieren system concave mirror.

[0009] The aforementioned test system for the squeezing flow enhanced ammonia combustion equipment, the second Z-type Schlieren imaging system includes a second Schlieren light source, a second Schlieren slit, a fourth Schlieren system plane mirror and a fourth Schlieren system concave mirror arranged outside the second bomb window on one side, and a third Schlieren system concave mirror, a third Schlieren system plane mirror, a second Schlieren knife edge and a second high-speed camera arranged outside the second bomb window on the other side; the light emitted by the second Schlieren light source passes through the second Schlieren slit, the fourth Schlieren system plane mirror and the fourth Schlieren system concave mirror in turn to illuminate the interior of the second bomb, and the second high-speed camera photographs the internal situation of the second bomb through the second Schlieren knife edge, the third Schlieren system plane mirror and the third Schlieren system concave mirror.

[0010] The aforementioned test system for the squeeze flow enhanced ammonia combustion equipment, the data acquisition mechanism includes a first pressure gauge and a first pressure sensor connected to the interior of the first bomb body, a first high-voltage voltage probe and a first current probe connected to the first igniter via a line, a second pressure gauge and a second pressure sensor connected to the interior of the second bomb body, a second high-voltage voltage probe and a second current probe connected to the second igniter via a line, a third pressure sensor and a third pressure gauge connected to the interior of the membrane rupturing mechanism body, and an oscilloscope; the oscilloscope is respectively connected to the first high-voltage voltage probe, the first current probe, the second high-voltage voltage probe, and the second current probe via lines; the oscilloscope is connected to a charge amplifier via lines, and the charge amplifier is respectively connected to the first pressure sensor, the second pressure sensor, and the third pressure sensor via lines.

[0011] The aforementioned test system for generating squeeze flow enhanced ammonia combustion equipment also includes a heating mechanism; the heating mechanism includes a first heating resistor and a first temperature controller connected to the interior of the first bomb body, a second heating resistor and a second temperature controller connected to the interior of the second bomb body, and a third heating resistor and a third temperature controller connected to the interior of the membrane rupture mechanism body; the heating mechanism is used to maintain the internal temperature of the first bomb body, the second bomb body and the membrane rupture mechanism at a set value at the beginning of the test.

[0012] The aforementioned test system for generating squeeze flow enhanced ammonia combustion equipment also includes an intake and exhaust system; the intake and exhaust system includes a first intake valve and a first exhaust valve respectively connected to the first bomb body via pipelines, a third intake valve and a third exhaust valve respectively connected to the membrane rupture mechanism body via pipelines, and a second intake valve and a second exhaust valve respectively connected to the second bomb body via pipelines; the first intake valve is connected to a first gas tank via a pipeline; the first exhaust valve is connected to a first vacuum pump via a pipeline; the third intake valve is connected to a third gas tank via a pipeline; the third exhaust valve is connected to a third vacuum pump via a pipeline; the second intake valve is connected to a second gas tank via a pipeline; the second exhaust valve is connected to a second vacuum pump via a pipeline.

[0013] In the aforementioned test system for the squeeze flow enhanced ammonia combustion device, the first container body is provided with a first liquid fuel filling port; the second container body is provided with a second liquid fuel filling port.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, a pressure source is provided by pre-combustion of the first bomb, and a squish flow control unit between the second bomb and the first bomb is used to form a squish flow with different intensities and directions in the visualized second bomb, so as to simulate and study the ammonia combustion characteristics under the squish flow condition of the diesel engine.

[0015] 2. The present invention studies the power source provided by the pre-combustion of different fuels in the first bomb through visualization, quantitatively studies the influence of the power source on the enhanced ammonia combustion, and studies different gases (hydrogen, methane, etc.) and liquid fuels (methanol, gasoline, diesel, biomass fuel, etc.) as pre-combustion fuels. When ignited by the first igniter at different equivalence ratios, initial pressures, and initial temperatures, the pressure waves are formed. At the same time, the dynamic process of the flame is recorded and measured using an imaging mechanism and a data acquisition mechanism, and the characteristics of the pressure waves formed by different pre-combustion fuels under different initial conditions are studied.

[0016] 3. The present invention simulates the combustion characteristics of ammonia under the squish flow condition of a diesel engine in the second bomb. The pressure wave generated by the pre-combustion of the first bomb is guided by the guide plate in the membrane rupture mechanism and the first guide plate at the outer end, forming squish flows of different intensities and directions in the second bomb. The combustion process of ammonia ignited by the second igniter at different equivalence ratios, initial pressures, and initial temperatures is studied. At the same time, the dynamic process of the flame is recorded and measured using an imaging mechanism and a data acquisition mechanism, and the effect of different squish flow intensities and directions on enhancing ammonia combustion under different initial conditions is studied. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention; Figure 2It is a structural diagram of the membrane rupture mechanism; Figure 3 is the control timing of the synchronous controller; Figure 4 It is an image of the squeezing flow generated in the first volume; Figure 5 This is the schlieren pattern of the intensified ammonia combustion in the second bomb.

[0018] The marks in the accompanying drawings are: 1-first gas tank, 2-first air inlet valve, 3-first liquid fuel filling port, 4-first temperature controller, 5-first Schlieren instrument blade, 6-first high-speed camera, 7-first container, 8-first Schlieren system concave mirror, 9-first heating resistor, 10-third gas tank, 11-third high-speed camera, 12-third vacuum pump, 13-second Schlieren instrument blade, 14-second high-speed camera, 15-third Schlieren system plane mirror, 16-third Schlieren system concave Mirror, 17-second container, 18-second heating resistor, 19-second temperature controller, 20-computer, 21-second air inlet valve, 22-second gas tank, 23-second vacuum pump, 24-second exhaust valve, 25-second liquid fuel filling port, 26-second pressure gauge, 27-fourth Schlieren system plane mirror, 28-second Schlieren slit, 29-second Schlieren light source, 30-second igniter, 31-fourth Schlieren system concave mirror, 33-second pressure sensor, 34-second High-voltage voltage probe, 35-second current probe, 36-third pressure sensor, 37-charge amplifier, 38-oscilloscope, 39-third temperature controller, 40-first Schlieren light source, 41-first Schlieren slit, 42-first Schlieren system plane mirror, 43-first pressure sensor, 44-second Schlieren system concave mirror, 45-first igniter, 46-first high-voltage voltage probe, 47-first pressure gauge, 48-first current probe, 49-synchronous trigger controller, 50- The second Schlieren system plane mirror, 51-the first exhaust valve, 52-the first vacuum pump, 53-the membrane rupturing mechanism body, 54-the first clamping nut, 55-the first side film, 56-the first side ejector, 57-the first membrane rupturing needle fixing bracket, 58-the third air inlet valve, 59-the third exhaust valve, 60-the window, 61-the second clamping nut, 62-the second side film, 63-the guide plate, 64-the second membrane rupturing needle fixing bracket, 65-the second side ejector, 66-the third pressure gauge, 67-the third heating resistor. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and examples, but they are not intended to limit the present invention.

[0020] Example: A test system for a device for generating a squeeze flow-enhanced ammonia combustion, comprising: Figure 1 and 2 As shown, including: The first bomb body 7 has a volume of 2.0 L and is used to generate a high-pressure airflow as a squeeze flow power source through fuel pre-combustion; The second bomb body 17 has a volume of 10.0 L and is used for conducting an ammonia combustion test under controllable squish flow conditions; A squeeze flow control unit connects the first elastic body 7 and the second elastic body 17; the squeeze flow control unit includes a membrane rupture mechanism and a guide plate 63; the membrane rupture mechanism controls the membrane rupture threshold by using an adjustable spacing between a pin and a diaphragm. Under the action of the high-pressure airflow of the first elastic body 7, the pin punctures the diaphragm, thereby generating a squeeze flow from the first elastic body 7 to the second elastic body 17; the guide plate 63 is used to adjust the squeeze flow direction; An imaging mechanism, whose photographing ends are respectively aimed at the first bomb body 7, the second bomb body 17 and the window 60 on the membrane rupturing mechanism body 53; the imaging mechanism is used to capture the internal images of the first bomb body 7, the second bomb body 17 and the membrane rupturing mechanism during the test; A data acquisition mechanism is provided in the first bomb container 7 and the second bomb container 17; the data acquisition mechanism is used to collect data of the first bomb container 7 and the second bomb container 17 during testing; The synchronous trigger controller 49 is connected to the imaging mechanism and the data acquisition mechanism via lines respectively; the synchronous trigger controller 49 is connected to the computer 20 via lines; the synchronous trigger controller 49 is used to ensure that the imaging mechanism and the data acquisition mechanism synchronously collect images and data after ignition.

[0021] Preferably, if Figure 2As shown, the membrane breaking mechanism includes a membrane breaking mechanism body 53 whose two ends are respectively connected to the first elastic body 7 and the second elastic body 17, and a first side film 55 and a second side film 62 are respectively provided at both ends of the membrane breaking mechanism body 53. A first side ejector pin 56 is provided on the side of the first side film 55 close to the membrane breaking mechanism body 53, and a second side ejector pin 65 is provided on the side of the second elastic body 17 close to the second side film 62; the tip of the first side ejector pin 56 faces the first side film 55; the tip of the second side ejector pin 65 faces the second side film 62; the first elastic body 7 and the second elastic body 17 are connected to each other. Both the bomb body 17 and the membrane rupture mechanism body 53 are provided with windows 60. The diameter of the window 60 on the first bomb body 7 is 105mm, while the diameter of the window 60 on the second bomb body 17 is 160mm. A first igniter 45 is located within the first bomb body 7, while a second igniter 30 is located within the second bomb body 17. The deflector 63 is positioned between the membrane rupture mechanism body 53 and the second bomb body 17. A first compression nut 54 is fixedly connected to the left side of the first side membrane 55, while a second compression nut 61 is fixedly connected to the left side of the second side membrane 62. By rotating the corresponding compression nut to move it left and right, the gap between the membrane and the ejector pin can be adjusted to precisely control the membrane rupture moment, thereby controlling the pressure difference between the power source that generates the squeeze flow and the large bomb.

[0022] Preferably, if Figure 1As shown, the imaging mechanism includes a first Z-type schlieren imaging system, a third high-speed camera 11 and a second Z-type schlieren imaging system; the first Z-type schlieren imaging system corresponds to the window 60 of the first bomb 7; the shooting end of the third high-speed camera 11 corresponds to the window 60 of the membrane rupture mechanism, and the third high-speed camera 11 is used to shoot the intensity of the squeezing power source generated by different fuels, different membrane rupture moments and different initial conditions; the second Z-type schlieren imaging system corresponds to the window 60 of the second bomb 17. The first Z-type Schlieren imaging system includes a first Schlieren light source 40, a first Schlieren slit 41, a first Schlieren system plane mirror 42 and a second Schlieren system concave mirror 44 arranged outside the window 60 of the first bomb 7 on one side, and a first Schlieren system concave mirror 8, a second Schlieren system plane mirror 50, a first Schlieren knife edge 5 and a first high-speed camera 6 arranged outside the window 60 of the first bomb 7 on the other side; the light emitted by the first Schlieren light source 40 passes through the first Schlieren slit 41, the first Schlieren system plane mirror 42 and the second Schlieren system concave mirror 44 in sequence to illuminate the interior of the first bomb 7, and the first high-speed camera 6 shoots the internal situation of the first bomb 7 through the first Schlieren knife edge 5, the second Schlieren system plane mirror 50 and the first Schlieren system concave mirror 8. The second Z-type Schlieren imaging system includes a second Schlieren light source 29, a second Schlieren slit 28, a fourth Schlieren plane mirror 27, and a fourth Schlieren concave mirror 31, disposed outside the window 60 of the second bomb 17 on one side; and a third Schlieren concave mirror 16, a third Schlieren plane mirror 15, a second Schlieren knife edge 13, and a second high-speed camera 14, disposed outside the window 60 of the second bomb 17 on the other side. Light emitted by the second Schlieren light source 29 sequentially passes through the second Schlieren slit 28, the fourth Schlieren plane mirror 27, and the fourth Schlieren concave mirror 31 to illuminate the interior of the second bomb 17. The second high-speed camera 14 captures the interior of the second bomb 17 through the second Schlieren knife edge 13, the third Schlieren plane mirror 15, and the third Schlieren concave mirror 16. The first high-speed camera 6, the second high-speed camera 14, and the third high-speed camera 11 are connected to a computer 20 via a circuit.

[0023] Preferably, if Figure 1As shown, the data acquisition mechanism includes a first pressure gauge 47 and a first pressure sensor 43 connected to the interior of the first bomb body 7, a first high-voltage voltage probe 46 and a first current probe 48 connected to the first igniter 45 via a line, a second pressure gauge 26 and a second pressure sensor 33 connected to the interior of the second bomb body 17, a second high-voltage voltage probe 34 and a second current probe 35 connected to the second igniter 30 via a line, a third pressure sensor 36 and a third pressure gauge 66 connected to the interior of the membrane rupturing mechanism body 53, and an oscilloscope 38; the oscilloscope 38 is respectively connected to the first high-voltage voltage probe 46, the first current probe 48, the second high-voltage voltage probe 34 and the second current probe 35 via lines; the oscilloscope 38 is connected to a charge amplifier 37 via lines, and the charge amplifier 37 is respectively connected to the first pressure sensor 43, the second pressure sensor 33 and the third pressure sensor 36 via lines. In the first bomb, a first high-voltage probe 46 and a first current probe 48 record the ignition voltage and current over time, respectively. These results are also transmitted to an oscilloscope 38, providing a data basis for calculating the ignition energy. During the experiment, the oscilloscope can be used to monitor the pressure inside the first bomb 7, the membrane rupture mechanism, and the second bomb 17 in real time. After the experiment, the recorded voltage variation over time signal is output and converted into a transient pressure variation over time signal within the system, providing a data basis for quantitative research on the airflow intensity of the power source that generates the squeeze flow.

[0024] Preferably, if Figure 1 As shown, the system also includes a heating mechanism; the heating mechanism includes a first heating resistor 9 and a first temperature controller 4 connected to the interior of the first bomb 7, a second heating resistor 18 and a second temperature controller 19 connected to the interior of the second bomb 17, and a third heating resistor 67 and a third temperature controller 39 connected to the interior of the membrane rupture mechanism body 53. The heating mechanism is used to maintain the internal temperatures of the first bomb 7, the second bomb 17, and the membrane rupture mechanism at a set value at the beginning of the test. The first heating resistor 9 and the first temperature controller 4 are used to heat the fuel / air mixture and maintain it at the initial test temperature. The third heating resistor 67 and the third temperature controller 39 are used to heat the interior of the membrane rupture mechanism and maintain it at the initial test temperature.

[0025] Preferably, if Figure 1As shown, the system also includes an intake and exhaust system; the intake and exhaust system includes a first intake valve 2 and a first exhaust valve 51, each connected to the first bomb 7 via a pipeline; a third intake valve 58 and a third exhaust valve 59, each connected to the membrane rupture mechanism body 53 via a pipeline; and a second intake valve 21 and a second exhaust valve 24, each connected to the second bomb 17 via a pipeline. The first intake valve 2 is connected to the first gas tank 1 via a pipeline; the first exhaust valve 51 is connected to the first vacuum pump 52 via a pipeline; the third intake valve 58 is connected to the third gas tank 10 via a pipeline; the third exhaust valve 59 is connected to the third vacuum pump 12 via a pipeline; the second intake valve 21 is connected to the second gas tank 22 via a pipeline; and the second exhaust valve 24 is connected to the second vacuum pump 23 via a pipeline. The intake and exhaust system is used to inject and exhaust the fuel / air mixture into and out of the first bomb 7, flush residual combustion products in the membrane rupture mechanism at the beginning of intake, and inject and exhaust the ammonia / air mixture into and out of the second bomb 17.

[0026] Preferably, if Figure 1 As shown, the first elastic container 7 is provided with a first liquid fuel filling port 3 ; the second elastic container 17 is provided with a second liquid fuel filling port 25 .

[0027] Working principle: 1. System installation and debugging The device is installed and connected, the second elastic body 17 and the first elastic body 7 are assembled, and the two are connected through the squeeze flow control unit. The distance between the first side ejector pin 56 and the first side film 55 and the distance between the second side ejector pin 65 and the second side film 62 in the membrane rupturing mechanism body 53 are adjusted, and it is ensured that the film can be accurately ruptured when the pressure in the first elastic body 7 reaches the threshold.

[0028] The imaging mechanism was installed to ensure proper alignment of the first Schlieren light source 40 with the first Schlieren slit 41, the first Schlieren system plane mirror 42, and the second Schlieren system concave mirror 44, as well as the second Schlieren light source 29 with the second Schlieren slit 28, the fourth Schlieren system plane mirror 27, and the fourth Schlieren system concave mirror 31. The first high-speed camera 6 was adjusted to capture the interior of the small-capacity projectile through the second Schlieren system plane mirror 50 and the first Schlieren system concave mirror 8. The second high-speed camera 14 was adjusted to capture the interior of the large-capacity projectile through the second Schlieren knife edge 13, the third Schlieren system plane mirror 15, and the third Schlieren system concave mirror 16. These adjustments ensured clear imaging and covered the entire path of flame propagation. The first, second, and third high-speed cameras 6, 14, and 11 simultaneously recorded the flame propagation within the first projectile 7, the squeeze flow within the membrane rupture mechanism body 53, and the ammonia combustion within the second projectile 17.

[0029] The data acquisition mechanism is calibrated to ensure that it can accurately record the pressure changes in the first elastic body 7, the second elastic body 17 and the membrane rupturing mechanism, and the charge amplifier 37 and the oscilloscope 38 record the pressure change pattern.

[0030] 2. Experimental Preparation Initial conditions are set, and the heating mechanism is used to heat the first elastic body 7, the second elastic body 17 and the membrane breaking mechanism so that the system reaches the target initial temperature.

[0031] 3. Preparation of combustible mixture To ensure the integrity of the film, the vacuuming sequence is as follows: first, the first elastic body 7 is vacuumed to a vacuum degree of 0.098 MPa; second, the membrane rupture mechanism is vacuumed to a vacuum degree of 0.096 MPa, which is slightly higher than the pressure inside the first elastic body 7, to ensure the integrity of the first side film 55; third, the second elastic body 17 is vacuumed to a vacuum degree of 0.094 MPa, which is slightly higher than the pressure inside the membrane rupture system, to ensure the integrity of the second side film 62.

[0032] To ensure the integrity of the membrane, the filling sequence is as follows: First, an ammonia / air mixture is introduced into the second elastic body 17. Controlled by the second air inlet valve 21, various equivalence ratios can be achieved, such as 0.8, 0.9, 1.0, 1.1, 1.2, and 1.3, to reach the set initial experimental pressure, such as 0.1 MPa, 0.2 MPa, and 0.4 MPa. Second, the membrane rupture system is inflated with various inert gases, such as nitrogen or argon, to an initial pressure less than or equal to the pressure within the second elastic body 17 (≤0.001 MPa), thereby ensuring the integrity of the second side membrane 62. Third, the first elastic body 7 is inflated with a fuel / air mixture. The fuel can be hydrogen, methanol, or the like, to an initial pressure less than or equal to the pressure within the membrane rupture mechanism (≤0.001 MPa), thereby ensuring the integrity of the first side membrane 55. Fuel, such as hydrogen or methanol, is introduced into the first elastic body 7 through the first air inlet valve 2, and the initial pressure is adjusted, such as 1 bar or 2 bar.

[0033] Set up synchronous trigger controller 49, such as Figure 3 As shown, the control circuit and synchronous control signal output are controlled to work simultaneously, the data acquisition mechanism collects data, the first igniter 45 and the second igniter 30 ignition control output work in coordination, etc. The three cameras synchronously record the flame propagation, squeeze flow and membrane rupture flow of the first bomb body 7 and the ammonia premixed combustion process, and the second pressure sensor 33, the first pressure sensor 43 and the third pressure sensor 36 record the pressure change pattern in the second bomb body 17, the first bomb body 7 and the membrane rupture mechanism.

[0034] 4. Pre-combustion and squish generation The first igniter 45 in the first bomb 7 ignites, causing the fuel in the first bomb 7 to burn and generate a pressure wave. A membrane rupture threshold is set. When the internal pressure of the first bomb 7 reaches the threshold, the first side ejector 56 pierces the first side membrane 55 and the second side ejector 65 pierces the second side membrane 62, forming a high-speed squeeze flow, which enters the second bomb 17 through the guide plate 63.

[0035] By adjusting the initial pressure of the first elastic body 7 or the distance between the corresponding film and the ejector pin, the squeezing strength can be precisely controlled.

[0036] The delayed ignition time (0-50 ms) of the second igniter 30 in the second bomb body 17 is set to ensure that the ammonia gas burns under the action of squish flow turbulence.

[0037] The molding mechanism and the data acquisition mechanism are controlled by the synchronous trigger controller 49 to synchronously record the flame propagation speed and the dynamic pressure curve, and analyze the ammonia combustion enhancement mechanism.

[0038] V. Data Collection and Analysis The first high-speed camera 6, the second high-speed camera 14 and the third high-speed camera 11 synchronously shoot the flame shape, the squeeze vortex structure and the film breaking process, such as Figure 4 and Figure 5 shown.

[0039] The first pressure sensor 43, the second pressure sensor 33 and the third pressure sensor 36 are used to record the instantaneous pressure changes in the first elastic body 7, the second elastic body 17 and the membrane rupturing mechanism.

[0040] The collected data are subjected to data fitting, pressure fluctuation analysis and combustion characteristic evaluation through the oscilloscope 38 and the computer 20 .

[0041] 6. System reset and repeated experiment Clean the system, close the first air inlet valve 2 and the second air inlet valve 21, open the first exhaust valve 51 and the second exhaust valve 24, and start the first vacuum pump 52 and the second vacuum pump 23 to remove residual gas in the system to ensure that no combustibles remain.

[0042] New experimental parameters were set, the temperature was changed by the first temperature controller 4 and the second temperature controller 19, the initial pressure was changed by the first pressure gauge 47 and the second pressure gauge 26, the equivalence ratio was changed by the first intake valve 2 and the second intake valve 21, and the squeezing direction was changed by the guide plate 63. Then the experiment was repeated to conduct comparative tests under different conditions.

[0043] The experimental data were statistically analyzed to compare the ammonia combustion characteristics under different experimental conditions, and the specific effects of squeeze flow enhanced combustion were analyzed.

Claims

1. A test system for a device that generates squeeze flow-enhanced ammonia combustion, characterized by: include: A first bomb body (7) is used to generate a high-pressure airflow as a squeeze flow power source through fuel pre-combustion; A second bomb body (17) is used for conducting an ammonia combustion test under controlled squish flow conditions; A squeeze flow control unit is connected to the first elastic body (7) and the second elastic body (17); the squeeze flow control unit includes a membrane rupture mechanism and a guide plate (63); the membrane rupture mechanism controls the membrane rupture threshold through a pin and a diaphragm with an adjustable spacing, and punctures the diaphragm through the pin under the action of the high-pressure airflow of the first elastic body (7), so that the first elastic body (7) generates a squeeze flow toward the second elastic body (17); the guide plate (63) is used to adjust the squeeze flow direction.

2. The test system for generating a squeeze flow enhanced ammonia combustion device according to claim 1, characterized in that: The membrane breaking mechanism comprises a membrane breaking mechanism body (53) whose two ends are respectively connected to the first elastic body (7) and the second elastic body (17), and a first side film (55) and a second side film (62) are respectively provided at the two ends of the membrane breaking mechanism body (53), a first side ejector pin (56) is provided on the side of the first side film (55) close to the membrane breaking mechanism body (53), and a second side ejector pin (65) is provided on the side of the second side film (62) close to the second elastic body (17); the tip of the first side ejector pin (56) faces the first side film (55); the tip of the second side ejector pin (65) faces the second side film (55). Towards the second side film (62); windows (60) are provided on the first elastic body (7), the second elastic body (17) and the membrane breaking mechanism body (53); a first igniter (45) is provided inside the first elastic body (7); a second igniter (30) is provided inside the second elastic body (17); the guide plate (63) is provided between the membrane breaking mechanism body (53) and the second elastic body (17); a first clamping nut (54) is fixedly connected to the left side of the first side film (55); and a second clamping nut (61) is fixedly connected to the left side of the second side film (62).

3. The test system for generating a squish flow enhanced ammonia combustion device according to claim 1, characterized in that: Also includes: An imaging mechanism, wherein a shooting end thereof is respectively aligned with the windows (60) on the first bomb-containing body (7), the second bomb-containing body (17), and the membrane-breaking mechanism main body (53); the imaging mechanism is used to shoot internal images of the first bomb-containing body (7), the second bomb-containing body (17), and the membrane-breaking mechanism during the test process; A data acquisition mechanism is provided in the first bomb container (7) and the second bomb container (17); the data acquisition mechanism is used to acquire data of the first bomb container (7) and the second bomb container (17) during testing; A synchronous trigger controller (49) is connected to the imaging mechanism and the data acquisition mechanism via circuits; the synchronous trigger controller (49) is connected to the computer (20) via circuits; the synchronous trigger controller (49) is used to ensure that the imaging mechanism and the data acquisition mechanism synchronously collect images and data after ignition.

4. The test system for generating a squeeze flow enhanced ammonia combustion device according to claim 1, characterized in that: The imaging mechanism includes a first Z-type schlieren imaging system, a third high-speed camera (11) and a second Z-type schlieren imaging system; the first Z-type schlieren imaging system corresponds to the window (60) of the first bomb-containing body (7); the shooting end of the third high-speed camera (11) corresponds to the window (60) of the membrane breaking mechanism; the second Z-type schlieren imaging system corresponds to the window (60) of the second bomb-containing body (17).

5. The test system for generating a squeeze flow enhanced ammonia combustion device according to claim 4, characterized in that: The first Z-type Schlieren imaging system comprises a first Schlieren light source (40), a first Schlieren slit (41), a first Schlieren system plane mirror (42) and a second Schlieren system concave mirror (44) arranged outside the window (60) of the first bomb (7) on one side, and a first Schlieren system concave mirror (8), a second Schlieren system plane mirror (50), a first Schlieren knife edge (5) and a first high-speed camera (6) arranged outside the window (60) of the first bomb (7) on the other side; light emitted by the first Schlieren light source (40) passes through the first Schlieren slit (41), the first Schlieren system plane mirror (42) and the second Schlieren system concave mirror (44) in sequence to illuminate the interior of the first bomb (7), and the first high-speed camera (6) photographs the interior of the first bomb (7) through the first Schlieren knife edge (5), the second Schlieren system plane mirror (50) and the first Schlieren system concave mirror (8).

6. The test system for generating a squeeze flow enhanced ammonia combustion device according to claim 4, characterized in that: The second Z-type Schlieren imaging system comprises a second Schlieren light source (29), a second Schlieren slit (28), a fourth Schlieren system plane mirror (27) and a fourth Schlieren system concave mirror (31) arranged outside the window (60) of the second bomb-containing body (17) on one side, and a third Schlieren system concave mirror (16), a third Schlieren system plane mirror (15), a second Schlieren knife edge (13) and a second high-speed camera (14) arranged outside the window (60) of the second bomb-containing body (17) on the other side; light emitted by the second Schlieren light source (29) passes through the second Schlieren slit (28), the fourth Schlieren system plane mirror (27) and the fourth Schlieren system concave mirror (31) in sequence to illuminate the interior of the second bomb-containing body (17), and the second high-speed camera (14) photographs the interior of the second bomb-containing body (17) through the second Schlieren knife edge (13), the third Schlieren system plane mirror (15) and the third Schlieren system concave mirror (16).

7. The test system for generating a squeeze flow enhanced ammonia combustion device according to claim 3, characterized in that: The data acquisition mechanism includes a first pressure gauge (47) and a first pressure sensor (43) connected to the interior of the first elastic body (7), a first high-voltage voltage probe (46) and a first current probe (48) connected to the first igniter (45) via a line, a second pressure gauge (26) and a second pressure sensor (33) connected to the interior of the second elastic body (17), a second high-voltage voltage probe (34) and a second current probe (35) connected to the interior of the membrane breaking mechanism body (53), and a first pressure gauge (47) and a first pressure sensor (43) connected to the interior of the second elastic body (17). A third pressure sensor (36) and a third pressure gauge (66) and an oscilloscope (38) are connected to each other; the oscilloscope (38) is connected to the first high-voltage voltage probe (46), the first current probe (48), the second high-voltage voltage probe (34) and the second current probe (35) via lines; the oscilloscope (38) is connected to a charge amplifier (37) via lines, and the charge amplifier (37) is connected to the first pressure sensor (43), the second pressure sensor (33) and the third pressure sensor (36) via lines.

8. The test system for generating a squeeze flow enhanced ammonia combustion device according to claim 1, characterized in that: The system further includes a heating mechanism; the heating mechanism includes a first heating resistor (9) and a first temperature controller (4) connected to the interior of the first bomb (7), a second heating resistor (18) and a second temperature controller (19) connected to the interior of the second bomb (17), and a third heating resistor (67) and a third temperature controller (39) connected to the interior of the membrane rupturing mechanism body (53); the heating mechanism is used to maintain the internal temperatures of the first bomb (7), the second bomb (17) and the membrane rupturing mechanism at a set value at the beginning of the test.

9. The test system for generating a squeeze flow enhanced ammonia combustion device according to claim 1, characterized in that: The system further includes an intake and exhaust system; the intake and exhaust system includes a first intake valve (2) and a first exhaust valve (51) respectively connected to the first container (7) via pipelines, a third intake valve (58) and a third exhaust valve (59) respectively connected to the membrane rupturing mechanism body (53) via pipelines, and a second intake valve (21) and a second exhaust valve (24) respectively connected to the second container (17) via pipelines; the first intake valve (2) is connected to the first gas tank (1) via a pipeline; the first exhaust valve (51) is connected to the first vacuum pump (52) via a pipeline; the third intake valve (58) is connected to the third gas tank (10) via a pipeline; the third exhaust valve (59) is connected to the third vacuum pump (12) via a pipeline; the second intake valve (21) is connected to the second gas tank (22) via a pipeline; and the second exhaust valve (24) is connected to the second vacuum pump (23) via a pipeline.

10. The test system for generating a squeeze flow enhanced ammonia combustion device according to claim 1, characterized in that: The first container (7) is provided with a first liquid fuel filling port (3); the second container (17) is provided with a second liquid fuel filling port (25).

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