A detonation combustion chamber and detonation engine

Abstract

The application discloses a detonation combustion chamber and a detonation engine. The detonation combustion chamber comprises a combustion chamber body and a detonation wave one-way suppression device. The combustion chamber body is internally provided with an annular combustion cavity capable of generating detonation waves. The detonation waves comprise a first detonation wave propagating in a first direction and a second detonation wave propagating in a second direction. The first direction and the second direction are both circumferential directions of the annular combustion cavity, and the first direction is the opposite direction of the second direction. The detonation wave one-way suppression device is arranged in the annular combustion cavity and is arranged to act under the action of the first detonation wave and suppress the propagation of the first detonation wave to limit the collision of the first detonation wave and the second detonation wave. The detonation combustion chamber disclosed by the application can effectively solve the situation of starting failure and unstable combustion caused by the collision of detonation waves in two directions.

Description

TECHNICAL FIELD

[0001] The present application relates to, but is not limited to, the field of engines, and in particular to a detonation combustion chamber and a detonation engine. BACKGROUND

[0002] Detonation combustion is achieved by compressing a detonable mixture with a leading shock wave to cause a high-speed chemical reaction. Because detonation combustion has the advantages of high heat release intensity per unit time, self-pressurization, high combustion efficiency, and low pollutant emission, the propulsion technology based on detonation combustion is an important development trend for future space technology.

[0003] A rotating detonation engine (RDE) is a new concept engine that uses continuous detonation combustion to generate thrust. Compared with a pulse detonation engine (PDE) that also uses a detonation cycle, the RDE only needs to be ignited once to achieve continuous propagation of the detonation wave. The thermal cycle efficiency of the RDE is much higher than that of a traditional jet engine based on constant pressure combustion, and the RDE has a fast heat release rate and a simple structure. Therefore, the RDE has received widespread attention from countries around the world and has become one of the research hotspots in the field of aerospace propulsion.

[0004] Generally, there are two main ways to obtain stable detonation waves in an RDE: one is to use a spark plug, a burning wire, or an electric detonator to form an ignition source, generate a deflagration wave, and quickly develop into a detonation wave; the other is to use a pre-detonation tube to inject a detonation wave tangentially or vertically into the combustion chamber to directly ignite the combustible mixture in the combustion chamber and then form an initiating detonation wave. However, when using the above two methods, initially, detonation waves propagating in two directions (counterclockwise and clockwise) are formed in the combustion chamber. After the two detonation waves collide, since the wave fronts are both the combustion products at the end of the combustion, if the filling conditions are not good, the detonation waves are likely to be extinguished, causing the engine to fail to start, and even in an unstable process, four-wave or more wave modes may occur, affecting the performance of the detonation combustion chamber. In addition, even if the start is successful, the propagation direction of the detonation wave in the combustion chamber has strong randomness and is difficult to control artificially. SUMMARY

[0005] The embodiments of the present application provide a detonation combustion chamber and a detonation engine, which can effectively solve the problems of start failure and unstable combustion caused by the collision of detonation waves in two directions.

[0006] The embodiment of the present application provides a detonation combustion chamber, which comprises a combustion chamber body and a detonation wave one-way suppression device, the combustion chamber body is internally provided with an annular combustion cavity capable of generating a detonation wave, the detonation wave comprises a first detonation wave propagating in a first direction and a second detonation wave propagating in a second direction, the first direction and the second direction are both circumferential directions of the annular combustion cavity, and the first direction is the opposite direction of the second direction.

[0007] The detonation wave one-way suppression device is arranged in the annular combustion cavity and is arranged to act under the action of the first detonation wave and suppress the propagation of the first detonation wave to limit the collision of the first detonation wave and the second detonation wave.

[0008] Further, the detonation wave one-way suppression device comprises a shielding piece, and the state of the shielding piece comprises an open state and a closed state.

[0009] The shielding piece is switched from the closed state to the open state under the action of the first detonation wave, so as to reduce the flow area of the annular combustion cavity for the propagation of the detonation wave.

[0010] Further, the annular combustion cavity comprises an inner wall and an outer wall oppositely arranged along the radial direction thereof, one of the inner wall and the outer wall is arranged as a mounting wall surface; one end of the shielding piece is arranged as a connecting end and is rotatably connected with the mounting wall surface, and the other end of the shielding piece is arranged as a free end.

[0011] The rotation axis of the shielding piece is parallel to the central axis of the annular combustion cavity.

[0012] Further, when the shielding piece is in the open state, a gap is arranged between the free end of the shielding piece and the wall surface of the annular combustion cavity.

[0013] Further, the mounting wall surface is provided with a containing groove.

[0014] When the shielding piece is in the closed state, an opening is formed between the free end of the shielding piece and the wall surface of the containing groove, and part of the first detonation wave enters the containing groove through the opening, so as to drive the shielding piece to rotate to the open state and suppress the first detonation wave.

[0015] Further, the containing groove extends along the circumferential direction on the mounting wall surface.

[0016] In the propagation direction of the first detonation wave, an upstream end of the containing groove is provided with a transition surface, the transition surface connects the groove bottom of the containing groove and the mounting wall surface, and the transition surface serves as a guide structure to increase the first detonation wave entering the containing groove.

[0017] The free end of the shielding piece and the transition surface form the opening.

[0018] Further, the accommodating grooves are arranged circumferentially along the mounting wall surface as one or more, and the shielding pieces are correspondingly arranged as one or more; and / or, the accommodating grooves are arranged axially along the mounting wall surface as one or more, and the shielding pieces are correspondingly arranged as one or more.

[0019] Further, the shielding piece is located in the accommodating groove, and one side of the shielding piece facing the annular combustion chamber flow passage in the closed state is arranged as an arc surface matching the mounting wall surface; or, the shielding piece is concavely arranged in the accommodating groove.

[0020] Further, the knock one-way suppression device further comprises a first limiting device arranged in the annular combustion chamber, and the first limiting device is arranged to limit the free end of the shielding piece against the mounting wall surface when the shielding piece is in the closed state, so that the free end of the shielding piece and the accommodating groove form the opening.

[0021] Further, the accommodating groove is a stepped groove, and the stepped structure in the accommodating groove is arranged to abut against the shielding piece when the shielding piece is in the closed state.

[0022] The first limiting device comprises the stepped structure.

[0023] Further, the knock one-way suppression device further comprises a reset device cooperating with the shielding piece and arranged to provide a reset force for switching the shielding piece from the open state to the closed state.

[0024] Further, a torsional spring is arranged at the rotating connection between the shielding piece and the mounting wall surface, and the reset device comprises the torsional spring; or, a tension spring is connected between the shielding piece and the mounting wall surface, and the reset device comprises the tension spring; or, a compression spring is connected between the shielding piece and an outer wall or an inner wall as a non-mounting wall surface, and the reset device comprises the compression spring.

[0025] Further, the knock one-way suppression device further comprises a second limiting device arranged in the annular combustion chamber, and the second limiting device is arranged to limit when the shielding piece is in the open state, so as to limit the shielding piece in the open state.

[0026] Further, the axial length of the shielding piece is 1 / 3 to 1 / 2 of the axial length of the annular combustion chamber, and / or the width of the shielding piece is 0.8 to 0.9 times the radial width of the annular combustion chamber.

[0027] The embodiments of the present application also provide a knock engine, which comprises the knock combustion chamber described above.

[0028] Compared with some technologies, the present application has the following beneficial effects:

[0029] The knock combustion chamber provided by the embodiment of the present application is provided with a knock wave one-way suppression device, which can suppress and block one of the two knock waves with opposite directions generated in the annular combustion chamber, so as to solve the problem of collision of the two knock waves with opposite directions in the annular combustion chamber, and avoid the problems of engine starting failure and unstable combustion in the working process.

[0030] The knock engine provided by the embodiment of the present application has the knock combustion chamber described above, is high in working efficiency and good in combustion stability, effectively solves the problems of engine starting failure and unstable combustion, and improves the working reliability of the knock engine.

[0031] Other features and advantages of the present application will be described in the subsequent description. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings are used to provide a further understanding of the technical solutions of the present application, and constitute a part of the specification, and are used to explain the technical solutions of the present application together with the embodiments of the present application, and do not constitute a limitation to the technical solutions of the present application.

[0033] Figure 1 Structure diagram of the knock combustion chamber described in the embodiment of the present application Figure One ;

[0034] Figure 2 Structure diagram of the knock combustion chamber described in the embodiment of the present application Figure Two (provided with an inner column in the combustion chamber);

[0035] Figure 3 Enlarged view of the knock wave one-way suppression device in Figure 2

[0036] Figure 4 Structure diagram of the knock combustion chamber described in the embodiment of the present application Figure Three (shutter in a closed state);

[0037] Figure 5 Enlarged view of the A part structure in Figure 4

[0038] Figure 6 Structure diagram of the knock combustion chamber described in the embodiment of the present application Figure Four (shutter in an open state);

[0039] Figure 7 Enlarged view of the B part structure in Figure 6

[0040] ILLUSTRATIONS:​​​

[0041] 1-combustion chamber body, 11-annular combustion cavity, 111-outer ring of combustion chamber, 112-inner column of combustion chamber, 113-inner wall, 114-outer wall, 2-detonation unidirectional suppression device, 21-obstruction piece, 211-rotation shaft, 31-receiving groove, 311-transition surface, 32-opening. DETAILED DESCRIPTION

[0042] To make the objects, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in detail below with reference to the drawings. It should be explained that the embodiments in the present application and the features in the embodiments can be combined with each other in any manner without conflict.

[0043] The continuous rotating detonation engine is a power technology using detonation combustion. The detonation combustion chamber is the core of the detonation engine and the main space for fuel mixing and combustion. The continuous rotating detonation combustion chamber is usually in the form of an annular gap.

[0044] Detonation: It is a combustion mode coupling shock wave and flame (chemical reaction), which has a fast chemical reaction rate, fast flame propagation (more than 1000 m / s), and can produce extremely high pressure and temperature. The detonation wave produces extremely high gas pressure (more than 1.5-5.5 MPa) and extremely high gas temperature (more than 2800 K).

[0045] The embodiments of the present application provide a detonation combustion chamber, as shown in Figures 1 to 7 The detonation combustion chamber includes a combustion chamber body 1 and a detonation unidirectional suppression device 2. The combustion chamber body 1 is provided with an annular combustion cavity 11 capable of generating a detonation wave. The detonation wave includes a first detonation wave propagating in a first direction and a second detonation wave propagating in a second direction. The first direction and the second direction are both circumferential directions of the annular combustion cavity 11, and the first direction is opposite to the second direction. The detonation unidirectional suppression device 2 is arranged in the annular combustion cavity 11 and is arranged to act under the action of the first detonation wave and suppress the propagation of the first detonation wave to limit the collision of the first detonation wave and the second detonation wave.

[0046] The detonation combustion chamber includes a combustion chamber body 1 and a detonation unidirectional suppression device 2. The detonation unidirectional suppression device 2 is arranged in the annular combustion cavity 11 and can suppress the detonation wave in a certain specific direction during the start of the engine or the working process of the engine.

[0047] For example, a second knock wave needs to propagate in the second direction during the engine working process, and the first knock wave needs to be suppressed and blocked. When the first knock wave propagates in the circumferential direction in the annular combustion chamber 11, the knock one-way suppression device 2 acts under the action of the first knock wave, without the need for an operator to control it, and can effectively block and suppress the first knock wave propagating in the first direction.

[0048] The first direction can be Figure 2 and the second direction can be Figure 4 the clockwise direction. It should be understood that in actual application, whether to suppress the knock wave in the clockwise direction or the counterclockwise direction should be selected according to the actual situation. Figure 2 Figure 4 The first direction can be Figure 2 and the second direction can be Figure 4 the clockwise direction. It should be understood that in actual application, whether to suppress the knock wave in the clockwise direction or the counterclockwise direction should be selected according to the actual situation.

[0049] The knock combustion chamber can include a combustion chamber outer ring 111 and a combustion chamber inner column 112, the combustion chamber outer ring 111 is sleeved outside the combustion chamber inner column 112 and is coaxially arranged with the combustion chamber inner column 112 to surround the annular combustion chamber 11.

[0050] In an exemplary embodiment, as shown in Figure 3 , Figure 5 and Figure 7 , the knock one-way suppression device 2 includes a shielding piece 21, the state of the shielding piece 21 includes an open state and a closed state; the shielding piece 21 is switched from the closed state to the open state under the action of the first knock wave to reduce the flow area for the propagation of the knock wave in the annular combustion chamber 11.

[0051] The knock one-way suppression device 2 includes a rotatable shielding piece 21, which rotates to switch between the closed state and the open state.

[0052] Under the action of the second knock wave, the shielding piece 21 rotates from the closed state to the open state to form an obstacle in the annular combustion chamber 11 to suppress the propagation of the second knock wave.

[0053] The shielding piece 21 can be a baffle.

[0054] In an exemplary embodiment, as shown in Figures 4 to 7 , the annular combustion chamber 11 includes an inner wall 113 and an outer wall 114 oppositely arranged in the radial direction thereof, one of the inner wall 113 and the outer wall 114 is arranged as a mounting wall surface, and the other is arranged as a matching wall surface; one end of the shielding piece 21 is arranged as a connecting end and is rotatably connected with the mounting wall surface, and the other end of the shielding piece 21 is arranged as a free end; and the rotation axis 211 of the shielding piece 21 is parallel to the central axis of the annular combustion chamber 11.

[0055] The connecting end of the shielding piece 21 is rotatably fixed on the mounting wall surface, and the free end of the shielding piece 21 rotates relative to the connecting end to switch between the open state and the closed state.

[0056] In other words, one end of the shielding piece 21 can be mounted on the outer wall 114, and the other end rotates towards the inner wall 113 to switch to the open state; or one end of the shielding piece 21 can be mounted on the inner wall 113, and the other end rotates towards the outer wall 114 to switch to the open state.

[0057] The rotation axis 211 of the shielding piece 21 is parallel to the central axis of the annular combustion chamber 11, that is, when the shielding piece 21 is in the closed state, the shielding piece 21 is perpendicular to the radial direction of the annular combustion chamber 11; when the shielding piece 21 is in the open state, the shielding piece 21 is parallel to the radial direction of the annular combustion chamber 11 (extends along the radial direction of the annular combustion chamber 11).

[0058] When the shielding piece 21 is in the open state, it does not necessarily completely close the flow passage of the annular combustion chamber 11, but can only shield part of the flow passage (where the shock wave is located) to reduce the precision requirements for the installation of the shielding piece 21 and the shielding piece 21 itself, and reduce the manufacturing cost.

[0059] In an exemplary embodiment, as shown in Figure 6 and Figure 7 When the shielding piece 21 is in the open state, a gap is provided between the free end of the shielding piece 21 and the wall surface of the annular combustion chamber 11.

[0060] A gap is provided between the free end of the shielding piece (i.e. the shielding piece 21) and the cooperating wall surface of the annular combustion chamber 11, which can ensure that the free end of the shielding piece does not get stuck with the cooperating wall surface when in the open state, avoiding the shielding piece from being unable to reset and affecting the normal propagation of the second shock wave.

[0061] In an exemplary embodiment, as shown in Figure 5 and Figure 7 An accommodating groove 31 is formed on the mounting wall surface; when the shielding piece 21 is in the closed state, an opening 32 is formed between the free end of the shielding piece 21 and the wall surface of the accommodating groove 31, and part of the first shock wave enters the accommodating groove 31 through the opening 32 to push the shielding piece 21 to rotate to the open state and suppress the first shock wave.

[0062] Taking the case where the accommodating groove 31 is formed on the outer wall 114 as an example: the accommodating groove 31 is formed on the outer wall 114 of the annular combustion chamber 11, and the shielding piece 21 is located inside the accommodating groove 31 in the radial direction of the annular combustion chamber 11, so that part of the first shock wave in the annular combustion chamber 11 enters the accommodating groove 31 to push the shielding piece 21 to rotate and shield the flow passage of the annular combustion chamber 11.

[0063] The opening 32 between the free end of the shield 21 and the accommodating groove 31 serves as an entrance for the first detonation wave to enter the accommodating groove 31, and the first detonation wave pushes the shield 21 to rotate after entering the accommodating groove 31.

[0064] After the shield 21 is switched to the open state by the partial first detonation wave, the first detonation wave blocks the remaining first detonation wave to suppress and eliminate the first detonation wave. After the shield 21 suppresses the first detonation wave, the shield 21 is still in the open state, and when the second detonation wave propagates to the shield 21, the second detonation wave pushes the shield 21 to reset because the direction of the second detonation wave is opposite to that of the first detonation wave, so that the second detonation wave smoothly passes through the shield 21, and the shield 21 is reset to prepare for the next first detonation wave.

[0065] It should be understood that the accommodating groove 31 can also be arranged on the inner wall 113, which is similar to the above arrangement, and will not be described here.

[0066] In an exemplary embodiment, the accommodating groove 31 extends circumferentially on the mounting wall surface, as shown in Figure 1 and Figure 2 In the propagation direction of the first detonation wave, the upstream end of the accommodating groove 31 is provided with a transition surface 311, and the transition surface 311 connects the groove bottom of the accommodating groove 31 and the mounting wall surface. The transition surface 311 serves as a guide structure to increase the first detonation wave entering the accommodating groove 31, as shown in Figure 3 , Figure 5 and Figure 7 The free end of the shield 21 and the transition surface 311 form an opening 32, as shown in Figure 5 .

[0067] In the propagation direction of the first detonation wave, the upstream of the accommodating groove 31 is provided with a transition surface 311, that is, the first detonation wave enters the entire accommodating groove 31 through the transition surface 311. The transition surface 311 can guide the first detonation wave to enter the accommodating groove 31, so as to increase the rotation speed of the shield 21 pushed by the first detonation wave, and improve the blocking effect of the shield 21 on the first detonation wave.

[0068] In an exemplary embodiment, the accommodating groove 31 is arranged circumferentially on the mounting wall surface as one or more, and the shield 21 is correspondingly arranged as one or more; and / or, the accommodating groove 31 is arranged axially on the mounting wall surface as one or more, and the shield 21 is correspondingly arranged as one or more (not shown in the figure).

[0069] The accommodating groove 31 and the shield 21 are arranged in pairs, that is, one shield 21 is arranged in each accommodating groove 31.

[0070] The number of the accommodating grooves 31 and the number of the shielding pieces 21 are arranged in the axial direction of the annular combustion chamber 11 to cope with different working conditions: in different working conditions or different detonation combustion chambers, the axial position of the annular combustion chamber 11 where the annular combustion chamber 11 generates the detonation wave can be different, and arranging the number of the accommodating grooves 31 and the number of the shielding pieces 21 in the axial direction of the annular combustion chamber 11 can effectively cope with the above-mentioned situation and improve the applicable range.

[0071] The number of the accommodating grooves 31 and the number of the shielding pieces 21 are arranged in the axial direction of the annular combustion chamber 11 to cope with different working conditions: in different working conditions or different detonation combustion chambers, the axial position of the annular combustion chamber 11 where the annular combustion chamber 11 generates the detonation wave can be different, and arranging the number of the accommodating grooves 31 and the number of the shielding pieces 21 in the axial direction of the annular combustion chamber 11 can effectively cope with the above-mentioned situation and improve the applicable range.

[0072] In an exemplary embodiment, the shielding piece 21 is located in the accommodating groove 31, and one side of the shielding piece 21 in the closed state faces the flow passage of the annular combustion chamber 11 and is arranged as an arc surface matched with the mounting wall surface; or the shielding piece 21 is concave in the accommodating groove 31.

[0073] One side of the shielding piece 21 is arranged as an arc surface matched with the mounting wall surface, in other words, in the closed state, the surface of the shielding piece 21 and the mounting wall surface form a smooth transition, and the shielding piece 21 does not protrude in the radial direction of the annular combustion chamber 11 beyond the mounting wall surface, thereby ensuring that the shielding piece 21 does not hinder the second detonation wave when it is in the closed state.

[0074] Of course, the shielding piece 21 can also be concave in the accommodating groove 31 to ensure that the shielding piece 21 does not protrude in the radial direction of the annular combustion chamber 11 beyond the mounting wall surface.

[0075] In an exemplary embodiment, the detonation one-way suppression device 2 further comprises a first limiting device (not shown in the figure) arranged in the annular combustion chamber 11, and the first limiting device is arranged to limit the free end of the shielding piece 21 against the mounting wall surface when the shielding piece 21 is in the closed state, so that an opening 32 is formed between the free end of the shielding piece 21 and the accommodating groove 31.

[0076] The first limiting device is used for limiting when the shielding piece 21 is in the closed state, avoiding the shielding piece 21 directly against the mounting wall surface, thereby closing the opening 32 between the free end of the shielding piece 21 and the reserved groove. The first limiting device leaves an opening 32 between the free end of the shielding piece 21 and the reserved groove for the pressure wave to pass through without being blocked.

[0077] The first limiting device can be a limiting block formed on the mounting wall surface.

[0078] In an exemplary embodiment, the accommodating groove 31 is a stepped groove (not shown in the figure), and the stepped structure in the accommodating groove 31 is arranged to abut against the shielding piece 21 when the shielding piece 21 is in the closed state; and the first limiting device comprises the stepped structure.

[0079] The form of the stepped groove can simplify the structure of the first limiting device, and the stepped structure can be used as the limiting structure, which is simple and reliable.

[0080] It should be understood that a limiting column or the like structure can also be arranged in the accommodating groove 31 as the first limiting device.

[0081] In an exemplary embodiment, the shock wave one-way suppression device 2 further comprises a reset device (not shown in the figure) cooperating with the shielding piece 21, which is arranged to provide a reset force for switching the shielding piece 21 from the open state to the closed state.

[0082] In addition to the second shock wave resetting the shielding piece 21 and allowing the second shock wave to pass normally, the shock wave one-way suppression device 2 further comprises a reset device cooperating with the shielding piece 21, which resets the shielding piece 21 faster under the reset force provided by the reset device after the shielding piece 21 completes the suppression of the first shock wave, so as to minimize the blocking effect on the second shock wave.

[0083] In an exemplary embodiment, a torsional spring is arranged at the rotating connection between the shielding piece 21 and the mounting wall surface, and the reset device comprises the torsional spring; or a tension spring is connected between the shielding piece 21 and the mounting wall surface, and the reset device comprises the tension spring; or a compression spring is connected between the shielding piece 21 and the outer wall 114 or the inner wall 113 as the non-mounting wall surface, and the reset device comprises the compression spring.

[0084] The elastic member can be a torsional spring, a tension spring, a compression spring or the like component, which can be used as the reset device to provide the reset force required for resetting the shielding piece 21.

[0085] In an exemplary embodiment, the shock wave one-way suppression device 2 further comprises a second limiting device (not shown in the figure) arranged in the annular combustion chamber 11, which is arranged to limit the shielding piece 21 in the open state.

[0086] The second limiting device is used to limit the shielding piece 21 in the open state, so as to avoid the situation that the shielding piece 21 rotates excessively and loses the shielding effect or is difficult to reset. The second limiting device can limit the shielding piece 21 in the radial direction parallel to the annular combustion chamber 11, so as to avoid further rotation of the shielding piece 21.

[0087] The second limiting device can be a limiting protrusion formed on the cooperating wall surface. That is, when the shielding piece 21 is mounted on the outer wall 114, the limiting protrusion can be arranged on the inner wall 113, so as to cooperate with the free end of the shielding piece 21.

[0088] In an exemplary embodiment, the axial length of the shield 21 is 1 / 3 to 1 / 2 of the axial length of the annular combustion chamber 11, and / or the width of the shield 21 is 0.8 to 0.9 times the radial width of the annular combustion chamber.

[0089] It should be understood that, Figure 1 and Figure 2 The axial dimensions of the shield or the detonation wave one-way suppression device 2 are only schematically illustrated and are not strictly shown in proportion.

[0090] The axial length of the shield 21 is set to be 1 / 3 to 1 / 2 of the axial length of the annular combustion chamber 11 to cover the detonation wave generation area in the axial direction.

[0091] When the number of shields 21 is set to be multiple, the length occupied by the multiple shields 21 in the axial direction can be 1 / 3 to 1 / 2 of the axial length of the annular combustion chamber 11. The "length occupied" mentioned here includes the interval between adjacent shields 21.

[0092] The width of the shield 21 is 0.8 to 0.9 times the radial width of the annular combustion chamber, so that a gap is reserved between the free end of the shield 21 and the matching wall surface to avoid friction, jamming, etc.

[0093] The rotary detonation combustion chamber provided by the embodiment of the present application can make the rotary detonation wave propagate in one direction, can hinder the rotary detonation wave in one direction (i.e., suppress the first detonation wave) in the annular combustion chamber 11 where the detonation wave has been formed, and only allow the detonation wave in the other direction to continue to propagate (i.e., allow the second detonation wave to propagate), thereby solving the problems that the existing rotary detonation combustion chamber forms double-wave collision after ignition and causes ignition failure, and the propagation direction of the detonation wave in the combustion chamber is random and uncontrollable. The detonation combustion chamber provided by the embodiment of the present application can effectively solve the problem of one-way propagation of the detonation wave, and has important significance for the practical application of the rotary detonation engine.

[0094] After the rotary detonation chamber is ignited to form a single or multiple unknown rotary direction detonation wave (the first detonation wave propagating in the first direction and the second detonation wave propagating in the second direction according to the propagation direction), if the shield 21 is set to promote the counterclockwise detonation wave, under the action of the shield 21 device, if there is a clockwise propagating detonation wave, the shield 21 will be opened by the clockwise propagating detonation wave, and then the clockwise propagating detonation wave is hindered by the shield 21 and extinguished; when there is no clockwise propagating detonation wave, the shield 21 is closed under the action of the reset device and does not affect the propagation of the counterclockwise detonation wave.

[0095] The embodiment of the present application also provides a detonation engine, which comprises the detonation combustion chamber.

[0096] The knock engine provided by the embodiment of the present application has the knock combustion chamber described above, is high in working efficiency, and is good in combustion stability, effectively solves the problems of engine starting failure and unstable combustion, and improves the working reliability of the knock engine.

[0097] In the description in the present application, it should be noted that the directions or position relationships indicated by "upper", "lower", "one end", "one side" and the like are the directions or position relationships shown based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated structure has a particular direction, is constructed and operated in a particular direction, and therefore cannot be understood as a limitation on the present application.

[0098] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "connection", "assembly", "installation" should be understood in a broad sense, for example, the term "connection" can be fixed connection, can also be detachable connection, or integral connection; can be direct connection, or indirect connection through an intermediate medium, can be internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0099] The embodiments described in the present application are exemplary rather than limiting, and it is obvious to those skilled in the art that there can be more embodiments and implementation schemes within the scope of the embodiments described in the present application. Although many possible combinations of features are shown in the drawings and discussed in the specific embodiments, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment can be used in combination with any other feature or element of any other embodiment, or can replace any other feature or element of any other embodiment.

[0100] The present application includes and contemplates combinations of features and elements known to those skilled in the art. The embodiments, features and elements disclosed in the present application can also be combined with any conventional features or elements to form a unique technical solution defined by the claims. Any feature or element of any embodiment can also be combined with features or elements from other technical solutions to form another unique technical solution defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in the present application can be implemented alone or in any appropriate combination. Therefore, the embodiments are not limited other than according to the limitations made according to the appended claims and their equivalent replacements. In addition, various modifications and changes can be made within the scope of protection of the appended claims.

Claims

1. A detonation combustion chamber, characterized in that, The device includes a combustion chamber body and a unidirectional detonation wave suppression device. The combustion chamber body is provided with an annular combustion chamber that can generate detonation waves. The detonation waves include a first detonation wave propagating in a first direction and a second detonation wave propagating in a second direction. The first direction and the second direction are both circumferential directions of the annular combustion chamber, and the first direction is the opposite direction of the second direction. The unidirectional detonation wave suppression device includes a shielding component, and the shielding component has an open state and a closed state. The shielding component switches from the closed state to the open state under the action of the first detonation wave, so as to reduce the flow area of ​​the annular combustion chamber for the propagation of the detonation wave; The annular combustion chamber includes an inner wall and an outer wall arranged opposite to each other in its radial direction, one of the inner wall and the outer wall being configured as a mounting wall surface; one end of the shielding member is rotatably connected to the mounting wall surface as a connecting end, and the other end of the shielding member is configured as a free end; The axis of rotation of the shielding member is parallel to the central axis of the annular combustion chamber; A receiving groove is provided on the mounting wall surface; The detonation wave unidirectional suppression device is located in the annular combustion chamber and is configured to: operate under the action of the first detonation wave and suppress the propagation of the first detonation wave to limit the collision between the first detonation wave and the second detonation wave. When the shielding member is in the closed state, an opening is formed between the free end of the shielding member and the wall of the receiving groove. Part of the first detonation wave enters the receiving groove through the opening to push the shielding member to the open state and suppress the first detonation wave.

2. The detonation combustion chamber according to claim 1, characterized in that, When the shielding member is in the open state, a gap is provided between the free end of the shielding member and the wall of the annular combustion chamber.

3. The detonation combustion chamber according to claim 1, characterized in that, The receiving groove extends circumferentially on the mounting wall surface; Along the propagation direction of the first detonation wave, a transition surface is provided at one upstream end of the receiving tank. The transition surface connects the bottom of the receiving tank and the mounting wall. The transition surface serves as a guiding structure to increase the first detonation wave entering the receiving tank. The opening is formed between the free end of the shield and the transition surface.

4. The detonation combustion chamber according to claim 1, characterized in that, The receiving groove is provided in one or more locations along the circumference of the mounting wall, and the blocking member is provided in one or more locations accordingly; and / or, The receiving groove is provided as one or more along the axial direction of the mounting wall, and the shielding member is provided as one or more accordingly.

5. The detonation combustion chamber according to claim 1, characterized in that, The shielding member is located in the receiving groove, and the side of the shielding member facing the annular combustion chamber flow channel when closed is configured as an arc surface that matches the mounting wall surface; or, The shielding member is recessed within the receiving groove.

6. The detonation combustion chamber according to claim 1, characterized in that, The detonation wave unidirectional suppression device further includes a first limiting device disposed in the annular combustion chamber. The first limiting device is configured to restrict the free end of the shielding member from abutting the mounting wall when the shielding member is in the closed state, so that the opening is formed between the free end of the shielding member and the receiving groove.

7. The detonation combustion chamber according to claim 6, characterized in that, The receiving groove is a stepped groove, and the stepped structure in the receiving groove is configured to abut against the blocking member when the blocking member is in the closed state. The first limiting device includes the stepped structure.

8. The detonation combustion chamber according to any one of claims 1 to 7, characterized in that, The unidirectional detonation wave suppression device further includes a reset device that cooperates with the shielding member, configured to provide a reset force to switch the shielding member from the open state to the closed state.

9. The detonation combustion chamber according to claim 8, characterized in that, A torsion spring is provided at the rotatable connection between the shielding member and the mounting wall surface, and the reset device includes the torsion spring; or... A tension spring connects the blocking member to the mounting wall surface, and the reset device includes the tension spring; or... A compression spring is connected between the shielding member and the outer or inner wall, which is a non-installation wall surface, and the reset device includes the compression spring.

10. The detonation combustion chamber according to any one of claims 1 to 7, characterized in that, The detonation wave unidirectional suppression device further includes a second limiting device disposed in the annular combustion chamber. The second limiting device is configured to limit the shielding member when it is in the open state, so as to limit the shielding member to the open state.

11. The detonation combustion chamber according to any one of claims 1 to 7, characterized in that, The axial length of the shielding member is 1 / 3 to 1 / 2 of the axial length of the annular combustion chamber, and / or the width of the shielding member is 0.8 to 0.9 times the radial width of the annular combustion chamber.

12. A knock engine, characterized in that, Includes the detonation combustion chamber as described in any one of claims 1 to 11.

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