A cavity combustion chamber ignition device and method coupling flow control and ignition

Abstract

This disclosure relates to a cavity combustion chamber ignition device and method coupling flow control and ignition. A precursor platform is located upstream of the cavity combustion chamber. The cavity combustion chamber ignition device includes an exciter, an igniter, an ignition power supply, and a speed sensor. The exciter is located on the precursor platform near the 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 disposed on the power supply body. The electrode array is electrically connected to the first output port. The igniter is installed in the cavity combustion chamber and electrically connected to the second output port. The control module is configured to: upon receiving an ignition signal, control the first output port to output a high voltage to break down the electrode array; and after a preset time interval following electrode array breakdown, control the second output port to output a high voltage to drive the igniter to ignite. Through the above technical solution, the cavity combustion chamber ignition device can efficiently and repeatedly ignite, improving the ignition success rate.

Description

Technical Field

[0001] This disclosure relates to the field of ramjet engine ignition technology, and more specifically, to a cavity combustion chamber ignition device and method that couples flow control and ignition. Background Technology

[0002] Hypersonic vehicles, as strategic equipment that countries are vying to develop, hold crucial value in fields such as space transportation and military applications, and have become a technological high ground in the aerospace industry. Ramjet engines, as the core power component of hypersonic vehicles, directly determine the overall performance of the aircraft. The concave combustion chamber, with its excellent flame stability, minimal total pressure loss, and lack of additional drag, has become the most widely used combustion chamber configuration in ramjet engines. However, ignition in a ramjet engine's concave combustion chamber faces enormous challenges. Due to its extremely high inlet flow velocity and extremely short fuel residence time within the combustion chamber, achieving successful ignition and stable combustion within such a short time is extremely difficult.

[0003] Currently, 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, these igniters can only be used once, which means that ramjet engines cannot meet the requirements for repeated ignition, making it difficult to ignite the concave combustion chamber of the ramjet engine and resulting in a low ignition success rate. Summary of the Invention

[0004] The purpose of this disclosure is to provide a cavity combustion chamber ignition device that couples flow control with ignition, which can efficiently repeat ignition and improve the ignition success rate.

[0005] To achieve the above objectives, this disclosure provides a cavity combustion chamber ignition device coupled with flow control. A precursor platform is provided upstream of the cavity combustion chamber. The cavity combustion chamber ignition device includes an exciter, an igniter, an ignition power supply, and a velocity sensor. The exciter is located on the precursor platform near the 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 disposed on the power supply body. The electrode array is electrically connected to the first output port. The igniter is installed in the cavity combustion chamber and electrically connected to the second output port. The velocity sensor is used to detect the incoming flow velocity in the cavity combustion chamber. The control module is configured to: upon receiving an ignition signal, control the first output port to output a high voltage to break down the electrode array; and after the electrode array breaks down, at a preset time interval, control the second output port to output a high voltage to drive the igniter to ignite.

[0006] Optionally, the electrode array includes two edge electrodes arranged at intervals along the spanwise direction, and at least one intermediate electrode disposed between the two edge electrodes, wherein the two edge electrodes are respectively connected to the positive and negative terminals of the first output port via 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, with the upper surfaces of the electrode array, the ceramic substrate, and the precursor platform being flush.

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

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

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

[0011] Optionally, the intermediate electrode groove has a spanwise dimension of 1 mm to 10 mm and a flowwise dimension of 0.5 mm to 3 mm; the depth of the intermediate electrode groove is 1 mm to 10 mm.

[0012] Optionally, the number of intermediate electrode slots is two, and the distance between the intermediate electrode slot and the adjacent edge electrode hole, as well as the distance between adjacent intermediate electrode slots, is 0.5mm to 5mm.

[0013] Based on the above technical solutions, this disclosure also provides a cavity combustion chamber ignition method coupled with flow control and ignition, and a cavity combustion chamber ignition device based on the above flow control and ignition coupled with ignition, comprising the following steps:

[0014] The speed sensor detects the inflow velocity in the concave combustion chamber in real time. V The control module is based on the detected incoming flow speed. V and the distance between the igniter and the exciter. L Automatically calculate the preset time Δ t The formula for calculating the preset time is: ;

[0015] After receiving the ignition signal, the control module controls the ignition power supply to operate. 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 an electric arc discharge and form a hot gas cloud. The moment of this electrode array breakdown is recorded as _____. ;

[0016] Interval preset time Δ t Then, the control module controls the second output port to output a high voltage to drive the igniter to ignite. This ignition moment is recorded as... t ,but ,exist t The hot air mass moves with the incoming flow to the area above the igniter, so that a high-temperature, low-speed zone is formed in the area above the igniter.

[0017] Repeat the above steps according to the engine's ignition frequency until stable combustion is established in the concave combustion chamber, thus completing ignition.

[0018] Optionally, the operating frequency of the exciter is the same as the ignition frequency of the igniter.

[0019] The cavity combustion chamber ignition device with flow control and ignition coupling provided by this disclosure, through the above technical solution, includes 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 the ignition signal, the control module first controls the first output port to output a high voltage to break down the electrode array, causing it to generate an arc discharge and form a hot gas cloud, improving the airflow and temperature conditions in the ignition area. After a preset 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 work of the exciter and the igniter, the coupling of flow control and ignition is achieved, greatly improving the ignition success rate of the cavity combustion chamber. Furthermore, by strictly controlling the working time of the exciter and the igniter, this disclosure ensures that the igniter is activated when the hot gas cloud moves downstream to the ignition area with the incoming flow, so that the hot gas cloud and the igniter ignition are perfectly coordinated in time and space, further improving the reliability of ignition.

[0020] Furthermore, this disclosure pertains to an electric ignition method, which enables multiple re-ignitions and is suitable for the ignition requirements of reusable scramjet engines.

[0021] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0023] Figure 1This is a schematic diagram of the structure of the cavity combustion chamber ignition device with flow control and ignition coupling provided in the embodiments of this disclosure;

[0024] Figure 2 This is an exploded view of the cavity combustion chamber ignition device with flow control and ignition coupling provided in the embodiments of this disclosure;

[0025] Figure 3 This is a schematic diagram of the structure of the ceramic substrate provided in the embodiments of this disclosure;

[0026] Figure 4 This is a cross-sectional view of the ceramic substrate provided in an embodiment of this disclosure;

[0027] Figure 5 This is another structural schematic diagram of the ceramic substrate provided in the embodiments of this disclosure;

[0028] Figure 6 yes Figure 5 A schematic diagram of arc discharge occurring at point A, between the edge electrode and the middle electrode.

[0029] Figure 7 This is a state diagram of the cavity combustion chamber during ignition provided in the embodiment of this disclosure. At this time, the electrode array generates an electric arc discharge and forms a hot gas cloud.

[0030] Figure 8 This is another state diagram of the cavity combustion chamber during ignition provided in the embodiments of this disclosure. At this time, the hot gas mass moves downstream with the incoming flow and is located upstream of the igniter.

[0031] Figure 9 This is another state diagram of the cavity combustion chamber during ignition provided in the embodiments of this disclosure. At this time, the hot gas mass is located directly above the igniter.

[0032] Figure 10 This is another state diagram of the cavity combustion chamber during ignition provided in the embodiments of this disclosure. At this time, the hot gas mass forms an initial fire nucleus in the recirculation zone of the cavity combustion chamber.

[0033] Figure 11 This is a state diagram of the cavity combustion chamber when it is successfully ignited, as provided in the embodiments of this disclosure.

[0034] Explanation of reference numerals in the attached drawings: 1. Cavity combustion chamber; 2. Forebody 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. Ignition device; 5. Ignition power supply; 51. First output port; 52. Second output port; 6. Hot gas mass; 7. Electric arc; 8. Initial flame core. Detailed Implementation

[0035] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0036] In this disclosure, unless otherwise stated, the terms "flow direction" and "development direction" are used respectively. Figure 1 The X and Y directions in the text, where "flow direction" also represents the incoming flow direction of the concave combustion chamber 1, and "depth" corresponds to... Figure 1 The Z-axis. Furthermore, the terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not imply order or importance. In the following description, when referring to the accompanying drawings, unless otherwise explained, the same reference numerals in different drawings denote the same or similar elements. The above definitions are for explanation and illustration only and should not be construed as limiting this disclosure.

[0037] According to exemplary embodiments of this disclosure, reference is made to Figure 1 and Figure 2 As shown, a cavity combustion chamber ignition device coupling flow control and ignition is provided. A front platform 2 is provided upstream of the cavity combustion chamber 1. The cavity combustion chamber ignition device includes an exciter 3, an igniter 4, an ignition power supply 5, and a velocity sensor. The exciter 3 is located on the front platform 2 near the 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 disposed on the power supply body. The electrode array is electrically connected to the first output port 51. The igniter 4 is installed in the cavity combustion chamber 1 and is electrically connected to the second output port 52. The velocity sensor is used to detect the incoming flow velocity of the cavity combustion chamber 1. The control module is configured to: control the first output port 51 to output a high voltage when an ignition signal is received to break down the electrode array; and control the second output port 52 to output a high voltage after a preset time interval after the electrode array breaks down, so as to drive the igniter 4 to ignite.

[0038] Through the above technical solution, the cavity combustion chamber ignition device with flow control and ignition coupling provided in this disclosure includes 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 the ignition signal, the control module first controls the first output port 51 to output a high voltage to break down the electrode array, causing it to generate an arc discharge and form a hot gas cloud 6, improving the airflow and temperature conditions in the ignition area. After a preset 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 work of the exciter 3 and the igniter 4, the coupling of flow control and ignition is realized, greatly improving the ignition success rate of the cavity combustion chamber 1. Furthermore, by strictly controlling the working time of the exciter 3 and the igniter 4, this disclosure ensures that the igniter 4 is activated when the hot gas cloud 6 moves with the incoming flow to the downstream ignition area, so that the hot gas cloud 6 and the igniter 4 are perfectly coordinated in time and space, further improving the reliability of ignition.

[0039] Furthermore, this disclosure pertains to an electric ignition method, which enables multiple re-ignitions and is suitable for the ignition requirements of reusable scramjet engines.

[0040] In this disclosure, the breakdown electrode array can be interpreted as the air between two adjacent electrodes being broken down to generate an electric arc. The arc has very low resistance, and it acts as a conductor, connecting the adjacent electrodes pair by pair, thereby forming a loop in the entire circuit; see reference. Figure 1 As shown, the front platform 2 is a flat plate structure with a wedge-shaped front edge and a square rear edge, and the wedge angle of the front edge of the front platform 2 is 30°; the concave combustion chamber 1 is a concave cavity, the front edge of the concave combustion chamber 1 is square, the rear edge is inclined at a tail end, and the inclination angle is 45°. The bottom of the concave combustion chamber 1 can have a round hole for installing the igniter 4; a rear platform for closing the concave combustion chamber 1 is provided downstream of the concave combustion chamber 1.

[0041] According to exemplary embodiments of this disclosure, referring to Figure 2 and Figure 5 As shown, the electrode array includes two edge electrodes 31 arranged at intervals along the spanwise direction, and at least one intermediate electrode 32 disposed between the two edge electrodes 31. The two edge electrodes 31 are respectively connected to the positive and negative terminals of the first output port 51 via wires. The intermediate electrode 32 serves to continue the discharge during the operation of the exciter 3, ensuring that the total discharge gap that the ignition power supply 5 can break down is discontinuously distributed throughout the entire discharge area, such as... Figure 6 As shown; the electric field distribution between the electrodes can be more reasonable through the intermediate electrode 32, and it is easier to generate a stable and appropriately strong electric arc 7 under high voltage; through the electrode array arranged at intervals along the span, a wider range of electric 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.

[0042] According to exemplary embodiments of this disclosure, referring to Figure 1 and Figure 2 As shown, the actuator 3 also includes a ceramic substrate 33, which is detachably embedded in the precursor platform 2. An electrode array is arranged on the ceramic substrate 33, and the upper surfaces of the electrode array, ceramic substrate 33, and precursor platform 2 are flush. In the above technical solution, referring to... Figure 3 As shown, a square notch can be made at the rear edge of the front platform 2, and at least two mounting holes 34 can be made on the ceramic substrate 33. In this way, after the ceramic substrate 33 is inserted into the square notch, the ceramic substrate 33 is fixedly connected to the front platform 2 by screws and mounting holes 34. When the electrode array is damaged or needs to be replaced, the ceramic substrate 33 and the electrode array on it can be easily replaced.

[0043] In this disclosure, the ceramic substrate 33 can be a square ceramic block made of alumina or other insulating high-temperature resistant ceramics, possessing good insulation and high-temperature resistance. This provides a stable support environment for the electrode array, withstands the high temperatures generated by arc discharge, and ensures the long-term stable operation of the actuator 3. The upper surfaces of the electrode array, ceramic substrate 33, and precursor platform 2 are flush, ensuring smooth airflow on the surface of the precursor platform 2 and avoiding additional airflow disturbances caused by surface unevenness. This ensures that the hot air mass 6 generated by the actuator 3 moves as expected and accurately reaches the ignition area. According to an exemplary embodiment of this disclosure, refer to... Figure 3 and Figure 4 As shown, an edge electrode hole 331 is formed on the ceramic substrate 33. The edge electrode hole 331 is constructed as a circular stepped hole and includes a connected small-diameter section 3311 and a large-diameter section 3312. The edge electrode 31 is installed in the small-diameter section 3311, wherein 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 install the edge electrode 31, which can play a role in positioning and fixing the electrode; the large-diameter section 3312 can accommodate the wire connection part, avoiding the wire being directly exposed to the airflow, reducing the impact and wear of the airflow on the wire, and extending the service life of the wire.

[0044] According to an exemplary embodiment of this disclosure, the diameter of the small-diameter segment 3311 is 0.5mm to 5mm. Exemplarily, the diameter of the small-diameter segment 3311 can be 0.5mm, 1mm, or 5mm; the hole depth of the small-diameter segment 3311 is 1mm to 10mm. Exemplarily, the hole depth of the small-diameter segment 3311 can be 1mm, 3mm, or 10mm; the diameter of the large-diameter segment 3312 is 1mm to 5mm, and the hole depth is 1mm to 10mm. Exemplarily, the diameter of the large-diameter segment 3312 can be 1mm, 3mm, or 5mm, and the hole depth of the large-diameter segment 3312 can be 1mm, 3mm, or 10mm. 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, avoiding installation difficulties or unstable operation due to improper size. In addition, appropriate aperture and depth can make the electric field distribution around the electrode more reasonable, making it easier to break down the air and generate an electric arc 7 under high voltage, and can maintain the stability of the electric arc 7 to a certain extent.

[0045] According to exemplary embodiments of this disclosure, referring to Figure 4 As shown, an intermediate electrode groove 332 is formed on the ceramic substrate 33. The intermediate electrode groove 332 is constructed as an elongated blind groove, and the intermediate electrode 32 is installed in the intermediate electrode groove 332. The elongated blind groove structure can effectively position and fix the intermediate electrode 32, preventing the intermediate electrode 32 from shifting or falling off under the impact of airflow or vibration, thus ensuring the stability of the electrode array structure. In addition, the blind groove design can reduce the direct impact of airflow on the intermediate electrode 32, while avoiding contamination and damage to the electrode by external impurities, thus extending the service life of the intermediate electrode 32.

[0046] According to an exemplary embodiment of this disclosure, the spanwise dimension of the intermediate electrode groove 332 is 1 mm to 10 mm; exemplarily, the spanwise dimension of the intermediate electrode groove 332 can be 1 mm, 6 mm, or 10 mm. The flowwise dimension is 0.5 mm to 3 mm; exemplarily, the flowwise dimension of the intermediate electrode groove 332 can be 0.5 mm, 1 mm, or 3 mm. The depth of the intermediate electrode groove 332 is 1 mm to 10 mm; exemplarily, the depth of the intermediate electrode groove 332 can be 1 mm, 3 mm, or 10 mm. The above-mentioned dimensional range allows for a more reasonable arrangement of the intermediate electrode 32 in both the spanwise and flowwise directions, forming a good fit with the intermediate electrode 32 and ensuring a uniform distribution of the electric arc 7 generated by the electrode array.

[0047] According to exemplary embodiments of this disclosure, referring to Figure 2 and Figure 4As shown, there are two intermediate electrode slots 332. The distance between the intermediate electrode slot 332 and the adjacent edge electrode hole 331, as well as the distance between adjacent intermediate electrode slots 332, is 0.5mm to 5mm. For example, it can be 0.5mm, 3mm, or 5mm. The appropriate spacing between adjacent components can make the interaction between the edge electrode 31 and the intermediate electrode 32 more coordinated, avoiding insufficient arc 7 intensity due to excessive spacing, or unnecessary interference caused by excessive spacing, thus ensuring the overall working efficiency of the exciter 3.

[0048] 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 following uses the number of intermediate electrode slots 332 as two examples to illustrate the length of the spanwise discharge region. We can take the spanwise length of the intermediate electrode slot 332 as 6mm, the width in the flow direction as 1mm, and the depth as 3mm; the diameter of the small diameter section 3311 of the edge electrode hole 331 is 1mm and the depth is 3mm, the diameter of the large diameter section 3312 is 3mm and the depth is 3mm; the spanwise electrode spacing is 3mm, then the length of the spanwise discharge region is 23mm.

[0049] Based on the above technical solutions, this disclosure also provides a cavity combustion chamber ignition method coupled with flow control and ignition, and a cavity combustion chamber ignition device based on the above flow control and ignition coupled with ignition, comprising the following steps:

[0050] The speed sensor detects the incoming flow velocity in the concave combustion chamber 1 in real time. V The control module is based on the detected incoming flow speed. V and the distance between igniter 4 and exciter 3 L Automatically calculate the preset time Δ t The formula for calculating the preset time is: ;

[0051] After receiving the ignition signal, the control module controls the ignition power supply 5 to operate. 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 an arc discharge and form a hot gas cloud 6. The moment of this electrode array breakdown is recorded as... ,like Figure 7 The state shown;

[0052] Interval preset time Δ t Then, the control module controls the second output port 52 to output a high voltage to drive the igniter 4 to ignite. This ignition moment is recorded as... t ,but ,exist t The hot air mass 6 moves with the incoming airflow to the area above the igniter 4, creating a high-temperature, low-speed zone above the igniter 4. Figure 9 The state shown;

[0053] Repeat the above steps according to the engine's ignition frequency until stable combustion is established in the concave combustion chamber 1, and ignition is completed.

[0054] According to an exemplary embodiment of this disclosure, the operating frequency of the exciter 3 is the same as the ignition frequency of the igniter 4.

[0055] 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 according to the change of the incoming flow velocity, ensuring that the hot gas mass 6 always reaches above the igniter 4 at the ignition moment. This adapts to the ignition requirements under different operating conditions and improves the adaptability of the method. The high-temperature, low-speed zone formed by the hot gas mass 6 increases the ignition temperature of the fuel and reduces the difficulty of ignition; on the other hand, it creates a suitable low-speed environment for ignition, greatly improving the ignition success rate. In addition, the ignition method of this disclosure can be repeatedly operated according to the engine ignition frequency, continuously strengthening the combustion state in the concave combustion chamber 1, gradually forming a stable flame, avoiding the flame extinction problem that may occur with single ignition, and ensuring the stability of combustion.

[0056] In this disclosure, the igniter 4 can be a typical aircraft engine electric spark igniter or a plasma jet igniter. The following describes the usage process of the flow control and ignition coupled concave combustion chamber ignition device of this disclosure, taking the plasma jet igniter as an example. See below for details:

[0057] The speed sensor detects the inflow velocity at the inlet of the concave combustion chamber 1 in real time. V Assuming the detected incoming flow velocity V The distance between igniter 4 and exciter 3 is 680 km. L The diameter is 40mm, and the control module uses the formula... The preset time Δ is calculated. t =58.8 mm, of which, V The inflow velocity represents the concave combustion chamber 1; L Δ represents the distance between igniter 4 and exciter 3; t This represents the time interval after the first output port 51 outputs a high voltage that breaks down the electrode array;

[0058] Upon receiving an ignition signal from the engine control system, the control module immediately controls the first output port 51 to output a high voltage, for example, 10kV. This high voltage is applied to the two edge electrodes 31. Because the air between the edge electrodes 31 and the middle electrode 32 is broken down, an electric arc discharge is generated. This arc discharge instantly releases a large amount of energy, causing the surrounding air to rapidly heat and expand, forming a hot air mass 6. Figure 7 As shown, the temperature of hot air mass 6 is approximately 1500K, and this moment is denoted as... ;

[0059] Hot air mass 6 moves downstream with the incoming flow, such as Figure 8 The state shown;

[0060] After the electrode array breaks down, at a preset interval of 58.8 mm, the control module controls the second output port 52 to output a high voltage, driving the plasma jet igniter 4 to generate a spark for ignition. At this time, the hot gas cloud 6 moves to the top of the plasma jet igniter 4 under the influence of the incoming flow. Figure 9 As shown, this reduces the airflow velocity in the region, creating a high-temperature, low-speed zone, which provides favorable conditions for ignition.

[0061] After ignition, the hot gas mass 6 will continue to move downstream, and an initial fire core 8 will form in the recirculation zone of the concave combustion chamber 1, such as... Figure 10 The state shown;

[0062] The engine's ignition frequency is the same as the operating frequency of exciter 3. Following the above steps, the excitation and ignition operation can be repeated every 0.1 seconds. After continuous ignition, the fuel in the concave combustion chamber 1 is fully combusted, forming a stable flame. At this point, ignition is complete. Figure 11 The state shown.

[0063] In summary, the cavity combustion chamber ignition device and method using the flow control and ignition coupling of this disclosure can achieve efficient and reliable ignition in harsher environments (such as low temperature, low pressure, high speed, etc.). Moreover, the discharge frequency required by this application is the same as the ignition frequency, which reduces the ignition frequency and requires less energy, allowing it to 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 minimal, resulting in the same service life as the igniter 4. Furthermore, the exciter 3 of this application has a simple structure, requiring only simple modifications to existing engines to achieve efficient and reusable ignition, demonstrating strong engineering application capabilities.

[0064] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0065] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0066] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A cavity combustion chamber ignition device coupled with flow control and ignition, wherein a precursor platform (2) is provided upstream of the cavity combustion chamber (1), characterized in that, The 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 located on the front platform (2) near the 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 disposed on the power supply body. The electrode array is electrically connected to the first output port (51). The igniter (4) is installed in the cavity combustion chamber (1) and electrically connected to the second output port (52). The speed sensor is used to detect the incoming flow velocity of the cavity combustion chamber (1). 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 after the electrode array breaks down, control the second output port (52) to output a high voltage after a preset time interval to drive the igniter (4) to ignite.

2. The concave combustion chamber ignition device with flow control and ignition coupling according to claim 1, characterized in that, The electrode array includes two edge electrodes (31) arranged at intervals along the spanwise direction, and at least one intermediate electrode (32) disposed between the two edge electrodes (31). The two edge electrodes (31) are respectively connected to the positive and negative terminals of the first output port (51) by wires.

3. The concave combustion chamber ignition device with flow control and ignition coupling according to claim 2, characterized in that, 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.

4. The concave combustion chamber ignition device with flow control and ignition coupling according to claim 3, characterized in that, An edge electrode hole (331) is provided on the ceramic substrate (33). The edge electrode hole (331) is constructed as a circular stepped hole and includes a connected small diameter section (3311) and a large diameter section (3312). The edge electrode (31) is installed 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 concave combustion chamber ignition device with flow control and ignition coupling according to claim 4, characterized in that, The small diameter section (3311) has a diameter of 0.5mm to 5mm and a hole depth of 1mm to 10mm; the large diameter section (3312) has a diameter of 1mm to 5mm and a hole depth of 1mm to 10mm.

6. The concave combustion chamber ignition device 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) is constructed as a long strip blind groove, and the intermediate electrode (32) is installed in the intermediate electrode groove (332).

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

8. The concave combustion chamber ignition device coupled with flow control and ignition according to claim 7, characterized in that, The number of intermediate electrode grooves (332) is two. The distance between the intermediate electrode groove (332) and the adjacent edge electrode hole (331), and the distance between the adjacent intermediate electrode grooves (332) are both 0.5mm to 5mm.

9. A cavity combustion chamber ignition method coupled with flow control and ignition, based on the cavity combustion chamber ignition device coupled with flow control and ignition according to any one of claims 1 to 8, characterized in that, Includes the following steps: The velocity sensor detects the incoming flow velocity in the concave combustion chamber (1) in real time. V The control module is based on the detected incoming flow speed. V and the distance between the igniter (4) and the actuator (3). L Automatically calculate the preset time Δ t The formula for calculating the preset time is: ; After receiving the ignition signal, the control module controls the ignition power supply (5) to operate. 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 an arc discharge and form a hot gas cloud (6). The moment when this electrode array breaks down is recorded as _____. ; Interval preset time Δ t Then, the control module controls the second output port (52) to output a high voltage to drive the igniter (4) to ignite. This ignition moment is recorded as... t ,but ,exist t The hot air mass (6) moves with the incoming flow to the area above the igniter (4) so ​​that a high temperature and low speed zone is formed in the area above the igniter (4); Repeat the above steps according to the engine's ignition frequency until stable combustion is established in the concave combustion chamber (1) and ignition is completed.

10. The cavity combustion chamber ignition method coupled with 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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