A timing ignition system and method for a detonation-driven shock tunnel

Abstract

The embodiment of the application discloses a detonation driving shock wave wind tunnel timing ignition system and an ignition method, the ignition system comprises: a timing ignition module, which is used for storing ignition energy and sequentially detonating a plurality of ignition filaments according to preset ignition information; a monitoring and predication module, which is used for monitoring environmental parameters before the ignition filaments are detonated and / or during the interval of the detonation of the plurality of ignition filaments, and predetermining the start and stop of subsequent ignition operations according to the monitoring result; a parameter monitoring module, which is used for monitoring the ignition environment and / or ignition parameters and outputting the monitoring result; a discharge module, which is used for discharging the ignition energy stored in the timing ignition module when the monitoring and predication module predetermines that subsequent ignition operations need to be stopped; and a control module, which is used for monitoring the ignition process and controlling the completion of the ignition process; and the preset ignition information comprises ignition time intervals and ignition voltages of each ignition channel. The embodiment of the application realizes the effect of improving the stability and uniformity of an experimental flow field and ensuring the reliability and stability of an ignition process.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of detonation-driven shock tunnel ignition, in particular to a detonation-driven shock tunnel timing ignition system and an ignition method. BACKGROUND

[0002] The experimental capability of a hypersonic wind tunnel determines the performance of a hypersonic vehicle. In order to carry out hypersonic ground experimental research, various types of wind tunnels have been developed. The detonation-driven shock tunnel has the characteristics of high experimental flow field quality, low operation cost and good scalability, and plays an important role in hypersonic ground experimental equipment.

[0003] The detonation-driven shock tunnel uses chemical energy generated by the detonation of combustible gas to compress the experimental gas, and generates a flow field that meets the experimental requirements of a hypersonic vehicle. The detonation-driven shock tunnel can operate in forward detonation and reverse detonation modes. Both operating modes require an ignition system to ignite the combustible gas to initiate detonation, which is the key to the normal operation of the detonation-driven shock tunnel.

[0004] At present, the detonation-driven shock tunnel adopts a single-point ignition mode (i.e., forward driving mode, ignition is only performed at the auxiliary diaphragm machine of the drive section of the wind tunnel, and for the reverse driving mode, ignition is only performed at the main diaphragm machine of the drive section of the wind tunnel), and the diaphragm on the other side is opened by the shock process of the detonation wave. Due to the high kinetic energy of the detonation, the diaphragm is easily broken, which affects the quality of the experimental flow field and damages the nozzle of the wind tunnel and the experimental model.

[0005] In addition, the current ignition device does not have a monitoring and prediction function, which cannot ensure that the wind tunnel operates in the predetermined forward or reverse operating mode, is prone to overpressure, and has serious safety hazards. SUMMARY

[0006] Therefore, the embodiment of the present application provides a detonation-driven shock tunnel timing ignition system and an ignition method. By introducing a timing ignition module, a large amount of energy can be injected into the ignition wire in a short time to complete instantaneous detonation. The sequential operation of multiple ignition wires can be controlled according to the preset ignition information, thereby improving the stability and uniformity of the experimental flow field, avoiding diaphragm fragmentation, expanding the experimental range of the wind tunnel, and further introducing parameter monitoring and monitoring prediction. The reliability and stability of the ignition process can be better ensured, and the damage to the equipment caused by overpressure can be avoided.

[0007] In order to achieve the above purpose, the embodiment of the present application provides the following technical scheme:

[0008] In one aspect of the embodiment of the present application, a detonation-driven shock tunnel timing ignition system is provided, comprising:

[0009] A time sequence ignition module is configured to store ignition energy and sequentially detonate a plurality of ignition wires according to preset ignition information.

[0010] A monitoring and prediction module is configured to monitor environmental parameters before the ignition of the ignition wires and / or the interval between the ignitions of the plurality of ignition wires, and to predict the start and stop of subsequent ignition operations according to the monitoring results.

[0011] A parameter monitoring module is configured to monitor the ignition environment and / or ignition parameters and output the monitoring results.

[0012] A discharge module is configured to discharge the ignition energy stored in the time sequence ignition module when the monitoring and prediction module predicts that the subsequent ignition operation needs to be stopped.

[0013] A control module is configured to monitor the ignition process and control the completion of the ignition process.

[0014] The preset ignition information at least includes the ignition time interval and the ignition voltage of each ignition channel.

[0015] As a preferred scheme of the present application, the time sequence ignition module at least includes:

[0016] A high-voltage capacitor array composed of a plurality of high-voltage capacitors is configured to store energy and release the stored energy to detonate the ignition wires according to the ignition needs.

[0017] An ignition wire array has a plurality of ignition wires arranged inside the wind tunnel driving section.

[0018] An ignition wire detection unit is configured to detect the on-off of the ignition wires and feed back the ignition wire information.

[0019] A time sequence control unit is configured to set and control the ignition parameters according to the preset ignition information.

[0020] A charging control unit is configured to charge the high-voltage capacitor array and end the charging and disconnect the charging circuit when the charging voltage reaches a preset value.

[0021] An ignition control unit is configured to load the energy stored in the high-voltage capacitor array to the ignition wire array to sequentially detonate the ignition wires.

[0022] As a preferred scheme of the present application, a plurality of detonation initiation points are arranged in the wind tunnel driving section, each of the detonation initiation points corresponds to an ignition channel, and each of the ignition channels is provided with one of the ignition wires and one of the high-voltage capacitors.

[0023] As a preferred scheme of the present application, the ignition wire is a nichrome wire, and the diameter of the ignition wire is 0.1-0.15 mm and the length is 10-30 mm.

[0024] As a preferred scheme of the present application, the ignition wire and the high-voltage capacitor on each of the ignition channels are connected in series to form a discharge circuit, and the discharge circuit is insulated from the driving section of the wind tunnel.

[0025] As a preferred scheme of the present application, the monitoring and prediction module at least includes:

[0026] a pressure detection unit for measuring the pressure change of the driving section of the wind tunnel to obtain the completion information of the previous ignition process, and outputting a level signal according to the measurement information;

[0027] a fault-tolerant detection unit for receiving the level signal output by the pressure detection unit, and predicting the start and stop of the subsequent ignition operation according to the received level signal.

[0028] As a preferred scheme of the present application, when the pressure detection unit detects a pressure jump in the driving section of the wind tunnel, a high-level signal is output to the fault-tolerant detection unit.

[0029] As a preferred scheme of the present application, the control module at least includes:

[0030] a remote control unit for remotely setting the preset ignition information and remotely operating the charging, discharging and ignition of the timing ignition module;

[0031] a central control unit for setting, monitoring, feeding back and controlling the parameters of the multiple modules;

[0032] a synchronous trigger unit capable of outputting a TTL standard high-level signal according to the output signal of the remote control unit, providing a trigger signal for other measurement systems of the wind tunnel experiment, and realizing the cooperative operation of the various experimental systems of the wind tunnel.

[0033] In another aspect of the embodiment of the present application, a detonation-driven shock wave wind tunnel timing ignition method is also provided, which uses the detonation-driven shock wave wind tunnel timing ignition system described above. The detonation-driven shock wave wind tunnel timing ignition method includes:

[0034] S100, storing the ignition energy by the timing ignition module;

[0035] S200, completing the previous ignition according to the preset ignition information;

[0036] S300, predicting according to the monitoring result of the monitoring and prediction module;

[0037] S400, when the prediction result is to continue the subsequent ignition, step S500 is entered; when the prediction result is to stop the subsequent ignition, step S600 is entered;

[0038] S500, completing the subsequent ignition according to the preset ignition information;

[0039] S600, stop subsequent ignition, the discharge module discharges the ignition energy until the voltage drop is zero.

[0040] The embodiments of the present application have the following advantages:

[0041] 1) The storage of the ignition energy by the timing ignition module can ensure the ignition power, thereby ensuring the conversion of the combustion state from deflagration to detonation, effectively ensuring the stability and uniformity of the experimental flow field.

[0042] 2) The timing ignition is proposed, the ignition time interval of the main film clamping machine and the auxiliary film clamping machine is controlled according to the preset ignition information and according to the forward and reverse operation modes, and multiple ignition wires are sequentially detonated, not only realizing the timing ignition function, but also avoiding the film piece from being broken, ensuring the experimental flow field quality, avoiding the broken film piece from damaging the wind tunnel parts and the experimental model, and ensuring the wind tunnel to run according to the predetermined forward or reverse operation mode based on the monitoring and prediction module, and avoiding damage to the equipment caused by overpressure.

[0043] 3) Based on the setting of the parameter detection module, effective experimental data can be obtained within the experimental time, and based on the setting of the control module, timing synchronization trigger signals are provided for other measurement systems of the wind tunnel experiment at the same time of ignition, ensuring the cooperation between the measurement systems and improving the wind tunnel experiment capability.

[0044] 4) Based on the remote control module, the experimental operator can be away from the experimental site to avoid personnel injury caused by experimental accidents. DETAILED DESCRIPTION

[0045] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be obtained from the provided drawings without creative labor.

[0046] The structures, proportions, sizes, etc. shown in the specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and do not define the limiting conditions for the implementation of the present application, so they do not have technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0047] Figure 1A structural schematic diagram of a detonation-driven shock tunnel timing ignition system provided by an embodiment of the present application is shown in the figure.

[0048] Figure 2 A working timing diagram provided by one of the specific embodiments of the present application is shown in the figure. DETAILED DESCRIPTION

[0049] The embodiments of the present application are described below by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0050] As shown in the figure, Figure 1 the present application provides a detonation-driven shock tunnel timing ignition system, specifically comprising a timing ignition module, a monitoring and prediction module, a parameter monitoring module, a relief module and a control module. The following will be described in detail in combination with specific embodiments.

[0051] The pressure detection unit is used to measure the change of the pressure of the wind tunnel driving section, detect whether the previous ignition process is completed, and output a high-level signal to the fault-tolerant detection unit when the pressure in the wind tunnel driving section jumps.

[0052] The fault-tolerant detection unit receives the input signal of the pressure detection unit, and judges whether the subsequent ignition is allowed to complete the ignition process according to the timing setting.

[0053] The remote control unit is used to remotely set the ignition timing and ignition voltage, and realizes the functions of charging, discharging and ignition, so that the experimenters can be away from the experimental site, and the safety of the personnel is ensured.

[0054] The central control unit is the core module of the ignition system, and is used to complete the setting and control of the parameters of each module.

[0055] The timing control unit is used for the setting and control of the ignition timing, and each ignition channel can be independently set. The time control precision is better than 0.01 ms, the delay timing precision is better than 0.01 ms, and the delay time adjustment step is 0.1 ms.

[0056] The charging control unit is used to realize the charging of the high-voltage capacitor array, and the charging process is automatically ended and the charging loop is disconnected when the charging voltage reaches the set value.

[0057] The ignition control unit is used to control the energy storage of the high-voltage capacitor to be loaded to the ignition wire, to ignite the ignition wire, and then to ignite the high-pressure gas in the wind tunnel driving section.

[0058] Discharge module: used to slowly discharge the energy stored in the high-voltage capacitor array when the experiment needs to be interrupted, and the voltage is reduced to zero to ensure the safety of the operator.

[0059] Parameter monitoring module: used to display the state of each ignition channel, including the charging voltage, discharge timing and the on-off state of the ignition wire.

[0060] Synchronous triggering unit: after the remote control unit sends an ignition command, the synchronous triggering unit provides a TTL standard high-level signal to provide a trigger signal for other experimental measurement systems of the wind tunnel, so as to realize the cooperative operation of the experimental systems of the wind tunnel. Due to the short running time of the wind tunnel, the response time of the electromagnetic valve is limited, and therefore it is difficult to complete the experiments of the combustion characteristics of the hypersonic engine and the hypersonic engine cooling, thereby seriously limiting the experimental capacity of the wind tunnel. The introduction of the synchronous triggering unit can effectively improve the triggering accuracy and greatly improve the experimental capacity of the wind tunnel.

[0061] Ignition wire detection unit: used to detect the on-off state of the ignition wire and timely find out whether the ignition wire is blown off during the inflation process of the wind tunnel, so as to timely terminate the experiment.

[0062] High-voltage capacitor array: the high-voltage capacitor is used to store energy, and the stored energy is released under the control of the ignition control unit to detonate the ignition wire. The number of high-voltage capacitors is consistent with the number of ignition channels designed in the ignition system, and one high-voltage capacitor is arranged for each channel.

[0063] Ignition wire array: nickel-chromium wire with a diameter of 0.10-0.15 mm and a length of 10-30 mm is arranged at a position inside the driven section of the wind tunnel where detonation needs to be initiated, and the number of ignition wires is consistent with the number of ignition channels designed in the ignition system, and one ignition wire is arranged for each channel. The ignition wire and the high-voltage capacitor are connected in series to form a discharge circuit, and are insulated from the driven section of the wind tunnel.

[0064] Specifically, the following further describes a specific embodiment with only two initiation points.

[0065] In the actual initiation process, since the detonation-driven shock tunnel can operate in forward detonation and reverse detonation modes, it needs to be initiated at two different positions, and the two operating modes are only different in the initiation sequence. For the forward driving mode, the auxiliary clamping film machine at the driven section is the main initiation source, which is ignited first and requires direct initiation; the main clamping film machine at the driven section is the auxiliary initiation, which needs to be initiated with a delay. For the reverse driving mode, the main clamping film machine at the driven section is the main initiation source, and the auxiliary clamping film machine at the driven section is the auxiliary initiation. In order to ensure the reliability of the ignition process, two ignition points are arranged at the same position, and therefore the ignition system needs to be equipped with at least four channels (labeled as A, B, C and D, respectively). The working timing diagram is as follows:Figure 2 AB channel synchronization works, CD channel synchronization works; there is a delay between AB and CD, and the delay time range is dynamically adjustable.

[0066] Of course, for the way with more initiation points, two channels can be further set at each initiation point, and the initiation operation is sequentially performed in the above manner.

[0067] The application also provides a detonation-driven shock tunnel timing ignition method, which specifically comprises the following steps:

[0068] S100, storing the ignition energy by the timing ignition module;

[0069] S200, completing the previous ignition according to the preset ignition information;

[0070] S300, making a prediction according to the monitoring result of the monitoring and prediction module;

[0071] S400, when the prediction result is to continue the subsequent ignition, step S500 is entered; when the prediction result is to stop the subsequent ignition, step S600 is entered;

[0072] S500, completing the subsequent ignition according to the preset ignition information;

[0073] S600, stopping the subsequent ignition, and discharging the ignition energy by the discharge module until the voltage drop is zero.

[0074] Although the application has been described in detail with general description and specific embodiments above, some modifications or improvements can be made on the basis of the application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the application are within the scope of the application claimed.

Claims

1. A detonation-driven shock tunnel sequential ignition system, characterized in that, include: The timing ignition module is used to store ignition energy and sequentially ignite multiple ignition wires according to preset ignition information; The monitoring and prediction module is used to monitor environmental parameters before the ignition of the ignition wire and / or during the intervals between the ignition of multiple ignition wires, and to predict the start and stop of subsequent ignition operations based on the monitoring results. The parameter monitoring module is used to monitor the ignition environment and / or ignition parameters and output the monitoring results; The discharge module discharges the ignition energy stored in the timing ignition module when the monitoring and prediction module predicts that the subsequent ignition operation needs to be stopped. The control module is used to monitor the ignition process and control its completion; among which, The preset ignition information includes at least the ignition time interval and ignition voltage of each ignition channel; The timing ignition module includes at least: A high-voltage capacitor array, consisting of multiple high-voltage capacitors, is used to store energy and release the stored energy to ignite the ignition wire as needed. Ignition wire array, which has multiple ignition wires set inside the wind tunnel drive section; The ignition wire detection unit is used to detect the continuity of the ignition wire and provide feedback on the ignition wire information. The timing control unit is used to set and control ignition parameters according to preset ignition information; The charging control unit is used to charge the high-voltage capacitor array and to end the charging and disconnect the charging circuit after the charging voltage reaches the preset value. The ignition control unit is used to load the energy stored in the high-voltage capacitor array onto the ignition wire array, and ignite the ignition wires sequentially. The wind tunnel drive section is provided with multiple detonation initiation points, and each detonation initiation point is provided with multiple ignition channels. Each ignition channel is provided with one ignition wire and one high-voltage capacitor.

2. The detonation-driven shock tunnel timing ignition system according to claim 1, characterized in that, The ignition wire is a nickel-chromium wire, and the diameter of the ignition wire is 0.1-0.15mm and the length is 10-30mm.

3. The detonation-driven shock tunnel sequential ignition system according to claim 1, characterized in that, The ignition wire and the high-voltage capacitor on each ignition channel are connected in series to form a discharge circuit, and the discharge circuit is insulated from the wind tunnel drive section.

4. The detonation-driven shock tunnel timing ignition system according to claim 1, characterized in that, The monitoring and prediction module includes at least: The pressure detection unit is used to measure the pressure change in the wind tunnel drive section to obtain information on whether the pre-ignition process is completed, and outputs a level signal based on the measurement information. The fault-tolerant detection unit is used to receive the level signal output by the pressure detection unit and predict the start and stop of subsequent ignition operations based on the received level signal.

5. A detonation-driven shock tunnel sequential ignition system according to claim 4, characterized in that, When the pressure detection unit detects a pressure surge in the wind tunnel drive section, it outputs a high-level signal to the fault-tolerant detection unit.

6. The detonation-driven shock tunnel sequential ignition system according to claim 1, characterized in that, The control module includes at least: The remote control unit is used to remotely set preset ignition information and remotely operate the charging, discharging and ignition of the timing ignition module; The central control unit sets, monitors, provides feedback on, and controls the parameters of multiple modules. The synchronous triggering unit, based on the output signal of the remote control unit, can output a TTL standard high-level signal to provide trigger signals for other measurement systems in the wind tunnel experiment, thereby realizing the coordinated operation of various experimental systems in the wind tunnel.

7. A method for sequential ignition in a detonation-driven shock tunnel, characterized in that, The detonation-driven shock tunnel timing ignition system according to any one of claims 1-6, wherein the detonation-driven shock tunnel timing ignition method comprises: S100, ignition energy is stored through the timing ignition module; S200: Complete the pre-ignition according to the preset ignition information; S300. Make predictions based on the monitoring results of the monitoring and prediction module; S400: If the prediction result is to continue subsequent ignition, proceed to step S500; if the prediction result is to stop subsequent ignition, proceed to step S600. S500: Based on the preset ignition information, complete the subsequent ignition; S600: Stop subsequent ignition. The discharge module discharges the ignition energy until the voltage drops to zero.

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