CN113944567B - Design method and device for converting flame acceleration and deflagration into detonation - Google Patents
Design method and device for converting flame acceleration and deflagration into detonation Download PDFInfo
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- CN113944567B CN113944567B CN202111206926.2A CN202111206926A CN113944567B CN 113944567 B CN113944567 B CN 113944567B CN 202111206926 A CN202111206926 A CN 202111206926A CN 113944567 B CN113944567 B CN 113944567B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K7/00—Plants in which the working fluid is used in a jet only, i.e. the plants not having a turbine or other engine driving a compressor or a ducted fan; Control thereof
- F02K7/02—Plants in which the working fluid is used in a jet only, i.e. the plants not having a turbine or other engine driving a compressor or a ducted fan; Control thereof the jet being intermittent, i.e. pulse-jet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
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Abstract
The application relates to a design method and a device for converting flame acceleration and deflagration into detonation. The method comprises the following steps: providing a dynamically adjustable combined flow and solids barrier within the combustion chamber; the front end of the combustion chamber is provided with a monitoring device which is used for detecting the pressure and the speed of an incoming flow and sending a detection value to a fluid and solid combined barrier regulating and controlling device; designing a fluid and solid combined barrier regulating device, wherein the device is used for determining the flight Mach number of a mixture according to the pressure and the speed of a received incoming flow, and dynamically adjusting the lifting height of a solid barrier and the jet pressure and the jet time of a fluid barrier according to the flight height, the pressure and the flight Mach number of the incoming flow, so that the fluid and the solid barrier work in different working modes, and the rapid detonation under different flight Mach numbers is realized. The method can accelerate the flame of the pulse detonation engine and shorten the detonation distance and time under the condition of wide-speed-range flight, and can also reduce the pressure loss and excessive local hot spots under the condition of high-Mach flight by selecting different flame acceleration modes.
Description
Technical Field
The application relates to the technical field of detonation engines, in particular to a design method and device for converting flame acceleration and detonation into detonation.
Background
The hypersonic flight vehicle is a hot spot competitive in all countries at present, wherein the technical bottleneck restricting the maximum approach to the space flight vehicle is how to develop an efficient, economic and safe aerospace propulsion system. Knocking combustion is higher in combustion efficiency and the entropy increase is small. The propelling system based on detonation combustion has the characteristics of more compact structure, wide flight speed range (0-20 Ma), high combustion efficiency and the like, and is an ideal choice for the power propulsion of the aerospace vehicle in the future. The aspirated pulse detonation is more advantageous over a wide speed range. How to obtain a high-frequency short-distance detonation technology is still a bottleneck for restricting the pulse detonation engine. Direct initiation inside a closed tube typically requires the accumulation of a large amount of energy in the mixture in a short time, typically several orders of magnitude higher than the energy required to ignite the mixture, and so triggering detonation by this method remains a challenge. Accordingly, the onset of detonation combustion is typically produced by a flame acceleration mechanism from a lower energy ignition and by a Deflagration-to-detonation transition (DDT). However, the distance and time required for the DDT process of current pulse detonation engines remains large, especially for Pulse Detonation Engines (PDEs) that are relatively frequent.
The detonation engine has higher thermal cycle efficiency, and simultaneously utilizes detonation combustion to realize higher thrust performance. However, the working process of the pulse engine is a periodic multi-physical process of air intake, mixing, ignition, detonation-to-detonation, exhaust, blowing out, inert gas filling and the like, so that the working frequency of the engine is low, and the working efficiency and the propulsion performance of the engine are greatly influenced. Meanwhile, the working frequency of the current engine is difficult to further increase, and the detonation distance of the DDT still exceeds 500mm. Therefore, how to realize rapid detonation and obtain a short detonation distance is a bottleneck of the application of the detonation engine to engineering practice. Traditionally, fixed solid obstacles, spiral pipes and the like are mostly used to shorten the detonation distance and time, but the detonation distance and time can cause the engine to fly at high Mach, and thrust loss, too many local hot spots and the like are generated under the long-time operation. Therefore, how to find a fast flame acceleration method is urgent, so that flame propagation modes of the detonation engine for realizing deflagration to detonation in a shorter time and a shorter distance under different flight Mach numbers are realized.
Disclosure of Invention
In view of the above, it is necessary to provide a method and an apparatus for designing flame acceleration and detonation-detonation rotation knocking.
A method of designing flame acceleration and deflagration to detonation, the method comprising:
providing a dynamically adjustable combined flow and solids barrier within the combustion chamber; the fluid and solid combined barrier comprises a solid barrier and a fluid barrier, the lifting height of the solid barrier is adjustable, and the jet pressure and the jet time of the fluid barrier are adjustable.
The front end of the combustion chamber is provided with a monitoring device, and the monitoring device is used for detecting the pressure and the speed of an incoming flow and sending a detection value to a fluid and solid combined barrier regulating and controlling device.
And designing a fluid and solid combined barrier regulating and controlling device, wherein the fluid and solid combined barrier regulating and controlling device is used for determining the flight Mach number of the mixture according to the received pressure and speed of the incoming flow sent by the monitoring device, and dynamically regulating the lifting height of the solid barrier and the jet pressure and jet time of the fluid barrier according to the flight height, the pressure of the incoming flow and the flight Mach number, so that the fluid and the solid barrier work in different working modes, and the rapid detonation under different flight Mach numbers is realized.
In one embodiment, the number of the fluid and solid combined obstacles is multiple; the fluid barrier is composed of a jet hole and a jet flow; the spray hole is positioned inside the solid barrier; and a plurality of fluid and solid combined barriers are arranged in the combustion chamber according to a preset array and used for rapidly accelerating flame and realizing high-frequency short-distance detonation.
In one embodiment, the fluid and solid combined obstacle is formed by replacing one solid obstacle with a jet obstacle, and the formed fluid and solid combined obstacle accelerating device is used for accelerating the fluid and solid combined obstacle.
In one embodiment, the fluid and solid combined obstacle comprises a plurality of solid obstacles and a plurality of jet obstacles, and is installed in the combustion chamber according to a preset rule, and the fluid and solid combined obstacle accelerating device is formed by cross jet, colliding jet and the like.
In one embodiment, the different operating modalities include: a fixed barrier only mode, a fluid and solid combination barrier mode, and a fluid barrier only mode.
Designing a fluid and solid combined barrier regulating and controlling device, wherein the fluid and solid combined barrier regulating and controlling device is used for determining the Mach number of an incoming flow according to the received pressure and speed of the incoming flow sent by the monitoring device, and according to the flying height, the pressure of the incoming flow and the flying Mach number, the lift height of dynamic adjustment solid barrier and fluidic pressure and the efflux time of fluid barrier for fluid and solid barrier work in different working modes, realize the quick detonation under different flight mach numbers, include:
when 0-Ma-0.4, regulating and controlling the fluid and solid combined barrier by using a fluid and solid combined barrier regulating and controlling device to enable the fluid and solid combined barrier to work in a fixed barrier working mode, and selecting a higher blocking ratio to realize quick initiation; where Ma represents the flight mach number.
When the 0.4-Ma-as-woven fabric is composed of 1.0, the fluid and solid combined barrier is regulated and controlled by the fluid and solid combined barrier regulating and controlling device to work in a fluid and solid combined barrier working mode, the solid barrier is regulated to reduce the blocking ratio, and jet of the transverse jet flow barrier is realized through jet holes, so that rapid detonation is realized.
When Ma is larger than 1.0, the fluid and solid combined barrier is regulated and controlled by the fluid and solid combined barrier regulating and controlling device to work in a working mode of only the fluid barrier, and the optimal flame acceleration performance is realized by controlling the jet pressure and the jet delay time, so that the rapid detonation is realized.
In one embodiment, the raising or lowering of the solid barrier is accomplished by an electrically controlled device.
An apparatus for flame acceleration and deflagration to detonation, the apparatus comprising: a dynamically adjustable fluid and solid combination barrier, a monitoring device, and a fluid and solid combination barrier manipulation device.
The fluid and solid combined barrier is arranged in the combustion chamber according to a preset rule; the fluid and solid combined barrier comprises a solid barrier and a fluid barrier, the lifting height of the solid barrier is adjustable, and the jet pressure and the jet time of the fluid barrier are adjustable.
The monitoring device is arranged at the front end of the combustion chamber and used for detecting the pressure and the speed of the incoming flow and transmitting the detected value to the fluid and solid combined barrier regulating and controlling device.
The fluid and solid combined barrier regulating and controlling device is used for determining the flight Mach number of a mixture according to the received pressure and speed of incoming flow sent by the monitoring device, and dynamically regulating the lifting height of a solid barrier and the jet pressure and jet time of a fluid barrier according to the flight height, the pressure of the incoming flow and the flight Mach number, so that the fluid and the solid barrier work in different working modes, and rapid detonation under different flight Mach numbers is realized.
In one embodiment, the number of the fluid and solid combined obstacles is multiple, and the fluid obstacles are composed of jet holes and jet flows; the spray hole is positioned inside the solid barrier; a plurality of combined fluid and solid obstacles are mounted in the combustion chamber in a predetermined array.
In one embodiment, the fluid and solid combined obstacle is a fluid and solid combined obstacle accelerating device formed by replacing one solid obstacle by a jet obstacle.
In one embodiment, the combined fluid and solid obstacle comprises a plurality of solid obstacles and a plurality of jet obstacles, and is installed in the combustion chamber according to a preset rule.
The method and the device for designing the flame acceleration and the detonation-to-detonation conversion are characterized in that a dynamically adjustable fluid and solid combined barrier is arranged in a combustion chamber; the front end of the combustion chamber is provided with a monitoring device, and the monitoring device is used for detecting the pressure and the speed of incoming flow and sending a detection value to a fluid and solid combined barrier regulating and controlling device; and designing a fluid and solid combined barrier regulating and controlling device, wherein the device is used for determining the flight Mach number of the mixture according to the received pressure and speed of the incoming flow sent by the monitoring device, and dynamically regulating the lifting height of the solid barrier and the jet pressure and jet time of the fluid barrier according to the flight height, the incoming flow pressure and the flight Mach number, so that the fluid and the solid barrier work in different working modes, and the rapid detonation under different flight Mach numbers is realized. The method can accelerate the flame of the pulse detonation engine and shorten the detonation distance and time for converting detonation into detonation under the condition of wide-speed-range flight, and can also reduce the pressure loss and excessive local hot spots under the condition of high-Mach flight by selecting different flame acceleration modes.
Drawings
FIG. 1 is a schematic flow diagram illustrating a method for designing flame acceleration and deflagration to detonation conversion in one embodiment;
FIG. 2 is a schematic diagram of another embodiment of a wide velocity range pulse detonation dynamic liftable fluid and solid combined flame acceleration design method;
FIG. 3 is a schematic view of a combined fluid and solid barrier flame accelerator according to another embodiment;
FIG. 4 is a schematic view of another embodiment of a barrier flame acceleration device for a combination of fluids and solids;
FIG. 5 is a graph of operating modes of the combined fluid and solid barrier flame acceleration device in one embodiment at different Mach of flight for (a) fixed barrier only operating modes, (b) combined fluid and solid barrier operating modes, and (c) fluid barrier only operating modes;
FIG. 6 is a graph showing a flame propagation process and a flame propagation velocity according to two examples of another embodiment, wherein (a) is a flame surface position changing process; and (b) the flame propagation speed.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in FIG. 1, a method for designing flame acceleration and deflagration to detonation rotation is provided, the method comprising the steps of:
step 100: dynamically adjustable combined flow and solids obstructions are disposed within the combustion chamber.
The fluid and solid combined barrier comprises a solid barrier and a fluid barrier, the lifting height of the solid barrier is adjustable, and the jet pressure and the jet time of the fluid barrier are adjustable.
The fluid and solid combined barrier promotes the conversion from deflagration to detonation on the one hand, and on the other hand, through the dynamic adjustment of the fluid barrier blocking ratio, the starting distance and time for converting deflagration to detonation can be reduced, and the dynamic stable control for converting deflagration to detonation is realized, so that the fluid and solid combined barrier can be stably applied to a detonation engine.
Under actual flight conditions, different flame acceleration performance is required due to differences in flight altitude and flight mach number. If the solid barrier is completely fixed in the combustion chamber, at high mach numbers, the combustion chamber will generate strong shock waves, which will create strong pressure losses. At low mach numbers, if the flame is accelerated all by the flow obstruction, the flow resistance will be reduced, resulting in longer initiation times and distances. At high mach numbers, the accelerator mode is changed to a pure fluid barrier mode, which can prevent local hot spots caused by solid barriers under supersonic flight conditions. Therefore, the combined barrier of the fluid and the solid is designed to ensure that the blocking ratio of the solid barrier can be adjusted up and down, and the jet pressure and the jet time of the fluid barrier can be adjusted.
Step 102: the front end of the combustion chamber is provided with a monitoring device, and the monitoring device is used for detecting the pressure and the speed of incoming flow and sending a detection value to a fluid and solid combined barrier regulating and controlling device.
Since the combustion front end is greatly changed in pressure and speed under different flight Mach numbers, the Mach number of the mixture and the like are determined in real time by monitoring devices such as pressure, speed and the like at the combustion front end. And controlling the fluid and solid combined barrier to work in different working modes through the signal.
Step 104: and designing a fluid and solid combined barrier regulating and controlling device, wherein the fluid and solid combined barrier regulating and controlling device is used for determining the flight Mach number of the mixture according to the received pressure and speed of the incoming flow sent by the monitoring device, and dynamically regulating the lifting height of the solid barrier and the jet pressure and jet time of the fluid barrier according to the flight height, the pressure and the flight Mach number of the incoming flow, so that the fluid and the solid barrier work in different working modes, and the rapid detonation under different flight Mach numbers is realized.
Specifically, the fluid and solid combined barrier regulating and controlling device can determine the flight Mach number of the mixture according to the pressure and the speed of the received incoming flow, and dynamically adjust parameters such as the blocking ratio of the solid barrier, the jet opening time, the jet pressure, the jet delay time and the jet position according to the flight altitude, the pressure of the incoming flow and the flight Mach number, so that the requirements of the method for fast flame acceleration and fast deflagration to detonation under different flight altitudes and flight Mach numbers are met. Therefore, efficient operation of the pulse detonation engine under wide speed range (Ma = 0-4) flight conditions is achieved.
The different working modes include: a fixed barrier only mode, a fluid and solid combination barrier mode, and a fluid barrier only mode.
The fluid and solid combined barrier provided by the invention can accelerate flame and rapidly convert detonation into detonation, and a schematic diagram of a wide-speed-range pulse detonation dynamic liftable fluid and solid combined flame acceleration design method is shown in FIG. 2.
In the above design method for converting flame acceleration and deflagration into detonation, the method arranges a dynamically adjustable fluid and solid combined barrier in a combustion chamber; the front end of the combustion chamber is provided with a monitoring device, and the monitoring device is used for detecting the pressure and the speed of incoming flow and sending a detection value to a fluid and solid combined barrier regulating and controlling device; and designing a fluid and solid combined barrier regulating and controlling device, wherein the device is used for determining the flight Mach number of the mixture according to the received pressure and speed of the incoming flow sent by the monitoring device, and dynamically adjusting the lifting height of the solid barrier and the jet pressure and jet time of the fluid barrier according to the flight height, the incoming flow pressure and the flight Mach number, so that the fluid and the solid barrier work in different working modes, and the rapid detonation under different flight Mach numbers is realized. The method can accelerate the flame of the pulse detonation engine and shorten the detonation distance and time for converting detonation into detonation under the condition of wide-speed-range flight, and can also reduce the pressure loss and excessive local hot spots under the condition of high-Mach flight by selecting different flame acceleration modes. The present invention focuses on a wide range adjustable flame acceleration and detonation technique for dynamic fluid and solid combination barriers.
In one embodiment, the number of the fluid and solid combined obstacles is multiple; the fluid consists of jet holes and jet flow; the spray hole is positioned inside the solid barrier; and the plurality of fluid and solid combined barriers are arranged in the combustion chamber according to a preset array and used for rapidly accelerating flame and realizing high-frequency short-distance detonation.
The fluid and solid combined barrier is a flame accelerating device of the fluid and solid combined barrier capable of lifting and moving, the structure diagram of which is shown as the solid combined barrier flame accelerating device in figure 2, the fluid and solid combined barrier consists of a solid barrier and a fluid barrier, the fluid barrier consists of jet holes and jet flow, and the jet holes are positioned in the solid barrier. A plurality of combined barriers of fluid and solid are arranged in the detonation combustion chamber, so that the effect of quickly accelerating flame can be realized, and a high-frequency short-distance detonation technology is realized.
In one embodiment, the combined fluid and solid obstacle is formed by replacing a solid obstacle with a jet obstacle, and the combined fluid and solid obstacle accelerating device is formed. The schematic structural diagram of the barrier acceleration device combining fluid and solid is shown in fig. 3.
In one embodiment, the fluid and solid combined obstacle comprises a plurality of solid obstacles and a plurality of jet obstacles, is arranged in the combustion chamber according to a preset rule, and is formed by a fluid and solid combined obstacle accelerating device through cross jet, colliding jet and the like. The schematic structure of the fluid and solid combined obstacle accelerating device is shown in fig. 4.
In one embodiment, the different operating modalities include: a fixed-barrier-only mode of operation, a fluid-and-solid-combination-barrier mode of operation, and a fluid-barrier-only mode of operation; designing a fluid and solid combined barrier regulating and controlling device, wherein the fluid and solid combined barrier regulating and controlling device is used for determining the flight Mach number of a mixture according to the received pressure and speed of incoming flow sent by a monitoring device, and dynamically regulating the lifting height of a solid barrier and the jet pressure and jet time of a fluid barrier according to the flight height, the pressure and the flight Mach number of the incoming flow, so that the fluid and the solid barrier work in different working modes, and quick detonation under different flight Mach numbers is realized, and the fluid and solid combined barrier regulating and controlling device comprises: when 0-Ma-0.4, regulating and controlling the fluid and solid combined barrier by using a fluid and solid combined barrier regulating and controlling device to enable the fluid and solid combined barrier to work in a fixed barrier working mode, and selecting a higher blocking ratio to realize quick initiation; wherein Ma represents a flight Mach number; when 0.4-Ma-as-woven fabric is covered with 1.0, regulating and controlling the fluid and solid combined barrier by using the fluid and solid combined barrier regulating and controlling device to enable the fluid and solid combined barrier to work in a fluid and solid combined barrier working mode, regulating the solid barrier to reduce the blocking ratio, and realizing the jet of a transverse barrier through jet holes to realize quick detonation; when Ma is larger than 1.0, the fluid and solid combined barrier is regulated and controlled by the fluid and solid combined barrier regulating and controlling device to work in a working mode of only the fluid barrier, and the optimal flame acceleration performance is realized by controlling the jet pressure and the jet delay time, so that the rapid detonation is realized.
Specifically, the dynamic fluid and jet flow combined barrier regulating and controlling device comprises: according to different flight Mach numbers and working conditions, three different working modes are designed. Three different modes of operation are shown in fig. 5, in which (a) is a fixed barrier only mode of operation, (b) is a combined fluid and solid barrier mode of operation, and (c) is a fluid barrier only mode of operation.
1) Only fixed barrier operating modes, 0-Ma-0.4, are selected, and because the mach number of the aircraft is low, the mixture directly entering the combustion chamber is low in compressibility, so that in order to realize the detonation-to-detonation fast, strong flame acceleration performance is needed, and the flow-solid combined barrier mode is selected to be only fixed barriers, and simultaneously, the high blocking ratio Br =1- ((Ly-2 h)/Ly) 2 is selected. This makes it possible to realize rapid knocking.
2) Fluid and solid combination barrier operating modes, 0.4 and Ma and 1.0, wherein the gas entering the combustion has compressibility, but can be set as the fluid and solid combination barrier mode for realizing detonation initiation rapidly. The solid barrier can reduce the blockage rate (the solid barrier is lifted and descended through the electric control device), and the jet barrier can realize the injection of the transverse jet barrier through the jet holes.
3) Only the working mode of the fluid obstacle, ma >1.0, is that the mixed gas in the aircraft enters the supersonic flow mode, the solid obstacle can form high pressure loss, so the solid obstacle is cancelled in the combustion chamber, and the solid obstacle is lowered through an electric device. Only fluid barriers are arranged in the combustion chamber, and the optimal flame acceleration performance is realized by controlling the jet pressure and the jet delay time.
Therefore, different configuration modes of the fluid and the solid barrier are adjusted through the mixture flow state monitoring device, rapid detonation under different flight Mach numbers is realized, and the pulse detonation engine achieves the optimal working condition and working performance.
In one embodiment, the raising or lowering of the solid barrier is accomplished by an electrically operated control.
It should be understood that, although the steps in the flowchart of fig. 1 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 1 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
In one embodiment, there is provided an apparatus for flame acceleration and deflagration to detonation comprising: a dynamically adjustable fluid and solid combination barrier, a monitoring device, and a fluid and solid combination barrier regulating device.
The fluid and solid combined barrier is arranged in the combustion chamber according to a preset rule; the fluid and solid combined barrier comprises a solid barrier and a fluid barrier, the lifting height of the solid barrier is adjustable, and the jet pressure and the jet time of the fluid barrier are adjustable.
The monitoring device is arranged at the front end of the combustion chamber and used for detecting the pressure and the speed of the incoming flow and transmitting the detection value to the fluid and solid combined barrier regulating and controlling device.
The fluid and solid combined barrier regulating and controlling device is used for determining the flight Mach number of the mixture according to the received pressure and speed of the incoming flow sent by the monitoring device, and dynamically regulating the lifting height of the solid barrier and the jet pressure and jet time of the fluid barrier according to the flight height, the pressure of the incoming flow and the flight Mach number, so that the fluid and the solid barrier work in different working modes, and the rapid detonation under different flight Mach numbers is realized.
In one embodiment, the number of the fluid and solid combined obstacles is multiple, and the fluid obstacles are composed of jet holes and jet flows; the spray hole is positioned inside the solid barrier; a plurality of combined fluid and solid obstacles are mounted in the combustion chamber in a predetermined array.
In one embodiment, the fluid and solid combined obstacle is formed by replacing one solid obstacle with a jet obstacle, and the formed fluid and solid combined obstacle accelerating device is used for accelerating the fluid and solid combined obstacle.
In one embodiment, the combined fluid and solid obstacle comprises a plurality of solid obstacles and a plurality of jet obstacles, and is installed in the combustion chamber according to a preset rule.
In a verification embodiment, high-precision numerical simulation work is carried out through a Tianhe II super computer, and it is verified that under the fluid and solid combined barrier provided by the invention, the fluid jet barrier can also realize a flame acceleration function with the solid barrier, the turbulent mixing intensity of a combustion chamber is enhanced, the flame acceleration is promoted, and the time and the detonation distance required by the conversion from detonation to detonation are shortened.
Two calculations were performed in the examples, calculation 1 being the case where only the obstacle was disposed in the combustion chamber, and calculation 2 being the case where the combined fluid and solid obstacle was disposed in the combustion chamber. Fig. 6 traces the progress of the flame front and the propagation velocity of the flame front for two examples, and it can be seen from fig. 6 (a) and (b) that the flame can reach half CJ velocity quickly due to the obvious flame acceleration advantage of the combined barrier formed by the fluid and the solid, and the initiation time and distance are also greatly reduced.
The starting times and lengths of the DDTs in examples 1 and 2 are listed in table 1. When a single fluid jet and solid combined barrier was used, the start time of DDT was shortened from t =1.37514 msec to t =1.06906 msec, which was a 22.26% reduction in DDT time. Furthermore, the required length of the combustion chamber is also shortened from L =505mm to L =336.55mm. The DDT length is shortened by 33.36%, which means that the number of solid obstacles required can be reduced from 10 pairs to 7 pairs.
Initiation times and lengths of EXAMPLES 1 and 2 obtained in TABLE 1
In conclusion, the invention compares and verifies that the proposed transverse jet flow barrier can provide a proper blocking rate through high-precision numerical simulation work, and is beneficial to flame acceleration. Therefore, the combined barrier method provided by the invention is theoretically feasible and has excellent performance.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent application shall be subject to the appended claims.
Claims (9)
1. A design method for converting flame acceleration and deflagration into detonation is characterized by comprising the following steps:
providing a dynamically adjustable combined flow and solids barrier within the combustion chamber; the fluid and solid combined barrier comprises a solid barrier and a fluid barrier, the lifting height of the solid barrier is adjustable, and the jet pressure and the jet time of the fluid barrier are adjustable;
the front end of the combustion chamber is provided with a monitoring device, and the monitoring device is used for detecting the pressure and the speed of incoming flow and sending a detection value to a fluid and solid combined barrier regulating and controlling device;
designing a fluid and solid combined barrier regulating and controlling device, wherein the fluid and solid combined barrier regulating and controlling device is used for determining the flight Mach number of a mixture according to the received pressure and speed of incoming flow sent by a monitoring device, and dynamically regulating the lifting height of a solid barrier and the jet pressure and jet time of a fluid barrier according to the flight height, the pressure and the flight Mach number of the incoming flow, so that the fluid and the solid barrier work in different working modes, and quick detonation under different flight Mach numbers is realized;
wherein, different working modes include: a fixed-barrier-only mode of operation, a fluid-and-solid-combination-barrier mode of operation, and a fluid-barrier-only mode of operation;
the method comprises the following steps: designing a fluid and solid combined barrier regulating and controlling device, wherein the fluid and solid combined barrier regulating and controlling device is used for determining the flight Mach number of a mixture according to the received pressure and speed of incoming flow sent by a monitoring device, and dynamically regulating the lifting height of a solid barrier and the jet pressure and jet time of a fluid barrier according to the flight height, the pressure of the incoming flow and the flight Mach number, so that the fluid and the solid barrier work in different working modes, and the rapid detonation under different flight Mach numbers is realized, and the fluid and solid combined barrier regulating and controlling device comprises:
when 0 & num Ma & 0.4, regulating and controlling the fluid and solid combined barriers by the fluid and solid combined barrier regulating and controlling device to work in a fixed barrier working mode only, and selecting higher blocking ratio to realize quick detonation; wherein Ma represents a flight Mach number;
when 0.4-Ma-as-woven fabric is covered with 1.0, regulating and controlling the fluid and solid combined barrier by using the fluid and solid combined barrier regulating and controlling device to enable the fluid and solid combined barrier to work in a fluid and solid combined barrier working mode, regulating the solid barrier to reduce the blocking ratio, and realizing the jet of a transverse barrier through jet holes to realize quick detonation;
when Ma is larger than 1.0, the fluid and solid combined barrier is regulated and controlled by the fluid and solid combined barrier regulating and controlling device to work in a working mode of only the fluid barrier, and the optimal flame acceleration performance is realized by controlling the jet pressure and the jet delay time, so that the rapid detonation is realized.
2. The method of claim 1, wherein the fluid and solid combination barrier number is plural;
the fluid barrier is composed of a jet hole and a jet flow; the spray hole is positioned inside the solid barrier; and the plurality of fluid and solid combined barriers are arranged in the combustion chamber according to a preset array and used for rapidly accelerating flame and realizing high-frequency short-distance detonation.
3. The method of claim 1 wherein the combined fluid and solid barrier is a combined fluid and solid barrier acceleration device formed by replacing one solid barrier with a jet barrier.
4. The method according to claim 1, wherein the combined fluid and solid obstacle comprises a plurality of solid obstacles and a plurality of jet obstacles, and is installed in the combustion chamber according to a predetermined rule, and the combined fluid and solid obstacle accelerating means is formed by cross jet and colliding jet, etc.
5. The method of claim 1, wherein the raising or lowering of the solid barrier is accomplished by an electrically controlled device.
6. An apparatus for converting flame acceleration and deflagration to detonation, said apparatus comprising: the system comprises a dynamically adjustable fluid and solid combined barrier, a monitoring device and a fluid and solid combined barrier regulating and controlling device;
the fluid and solid combined barrier is arranged in the combustion chamber according to a preset rule, the fluid and solid combined barrier comprises a solid barrier and a fluid barrier, the lifting height of the solid barrier is adjustable, and the jet pressure and the jet time of the fluid barrier are both adjustable;
the monitoring device is arranged at the front end of the combustion chamber and used for detecting the pressure and the speed of an incoming flow and transmitting a detection value to the fluid and solid combined barrier regulating and controlling device;
the fluid and solid combined barrier regulating and controlling device is used for determining the flight Mach number of a mixture according to the received pressure and speed of incoming flow sent by the monitoring device, and dynamically regulating the lifting height of a solid barrier and the jet pressure and jet time of a fluid barrier according to the flight height, the pressure of the incoming flow and the flight Mach number, so that the fluid and the solid barrier work in different working modes, and quick detonation is realized under different flight Mach numbers;
the fluid and solid combined barrier regulating and controlling device is also used for regulating and controlling the fluid and solid combined barriers through the fluid and solid combined barrier regulating and controlling device when the 0-Ma-0.4 structure works in a fixed barrier working mode only, and a high blocking ratio is selected to realize rapid detonation; wherein Ma represents a flight Mach number; when 0.4-Ma-as-woven fabric is covered with 1.0, regulating and controlling the fluid and solid combined barrier by using the fluid and solid combined barrier regulating and controlling device to enable the fluid and solid combined barrier to work in a fluid and solid combined barrier working mode, regulating the solid barrier to reduce the blocking ratio, and realizing the jet of a transverse barrier through jet holes to realize quick detonation; when Ma is larger than 1.0, the fluid and solid combined barrier is regulated and controlled by the fluid and solid combined barrier regulating and controlling device to work in a working mode of only the fluid barrier, and the optimal flame acceleration performance is realized by controlling the jet pressure and the jet delay time, so that the rapid detonation is realized.
7. The device of claim 6, wherein the number of the fluid and solid combined obstacles is plural, and the fluid and solid combined obstacles are composed of solid obstacles, jet holes and jet flows; the spray hole is positioned inside the solid barrier; a plurality of combined fluid and solid obstacles are mounted in the combustion chamber.
8. The apparatus of claim 6 wherein the combined fluid and solid barrier is an acceleration device formed by replacing a solid barrier with a fluidic barrier.
9. The apparatus of claim 6, wherein the combined fluid and solid obstacles comprise a plurality of solid obstacles and a plurality of jet obstacles, and are installed in the combustion chamber according to a predetermined rule.
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