On-way staged fuel injection structure of rotary detonation combustion chamber

Abstract

The invention discloses a rotary detonation combustion chamber on-way staged fuel injection structure, and belongs to the technical field of fuel injection, the rotary detonation combustion chamber on-way staged fuel injection structure comprises a containing cavity formed in an air inlet device, the containing cavity is used for containing fuel, the air inlet device comprises an inner cylinder and an outer cylinder, and a gap between the inner cylinder and the outer cylinder forms an air inlet channel; the air inlet channel comprises a first air inlet flow channel, a contraction flow channel, a second air inlet flow channel and an expansion flow channel, the containing cavity is sequentially provided with a first injection structure, a second injection structure and a third injection structure, the first injection structure is used for injecting fuel into the first air inlet flow channel, the second injection structure is used for injecting fuel into the contraction flow channel, and the third injection structure is used for injecting fuel into the expansion flow channel. And the third injection structure is used for injecting fuel into the second gas inlet runner. The rotary detonation combustion chamber has the effects that fuel added into the air inlet channel and air entering the rotary detonation combustion chamber can be efficiently and fully mixed, and the combustion efficiency in the rotary detonation combustion chamber is improved.

Description

Technical Field

[0001] The invention relates to the field of fuel injection, in particular to a rotating detonation combustion chamber along-the-way graded fuel injection structure. Background Art

[0002] The rotating detonation combustion chamber is an advanced combustion technology device with the characteristics of efficient combustion, compact structure and strong thrust performance. Its main working principle is to consume the gas / air mixture through approximately isochoric combustion, thereby improving the combustion efficiency. Specifically, when the fuel and air mixture is injected into the detonation chamber through the air intake device, it instantly detonates to produce a shock wave and a detonation wave coupled with the chemical reaction zone. The high-temperature products formed by the combustion drive the shock wave forward, thereby driving the detonation wave to rotate in the combustion chamber.

[0003] During operation of the rotating detonation combustion chamber, it is usually necessary to add fuel at a position of the intake device close to the rotating detonation combustion chamber. Specifically, the intake device usually includes an inner cylinder and an outer cylinder coaxially fixed, wherein the gap between the inner cylinder and the outer cylinder forms an intake channel connected to the rotating detonation combustion chamber, and the intake channel includes an intake flow channel and an expansion flow channel sequentially connected from the intake direction, wherein the cross-sectional size of the expansion flow channel gradually increases and is connected to the rotating detonation combustion chamber. In order to ensure the proportion of fuel in contact with air after addition, the fuel is usually injected into the intake flow channel close to the free end of the expansion flow channel.

[0004] With respect to the above-mentioned related technologies, the fuel injected into the intake passage is not easy to achieve efficient and sufficient mixing with the air entering the rotating detonation combustion chamber, and the combustion efficiency in the rotating detonation combustion chamber is low. Summary of the invention

[0005] In order to facilitate the efficient and sufficient mixing of the added fuel in the intake passage and the air entering the rotating detonation combustion chamber, and to improve the combustion efficiency in the rotating detonation combustion chamber, the present application provides a rotating detonation combustion chamber along-the-way graded fuel injection structure.

[0006] The present application provides a rotating detonation combustion chamber along-the-way staged fuel injection structure, which adopts the following technical solutions: A rotating detonation combustion chamber along-the-way graded fuel injection structure comprises a accommodating chamber arranged in an intake device, the accommodating chamber is used to accommodate fuel, the intake device comprises an inner cylinder and an outer cylinder coaxially fixedly arranged, the gap between the inner cylinder and the outer cylinder forms an intake channel connected to the rotating detonation combustion chamber, the intake channel comprises a first intake flow channel, a contraction flow channel, a second intake flow channel and an expansion flow channel which are sequentially connected along the intake direction, the cross-sectional size of the contraction flow channel gradually decreases, and the cross-sectional size of the expansion flow channel gradually increases, the accommodating chamber is sequentially provided with a first injection structure, a second injection structure and a third injection structure along the intake direction, the first injection structure is used to inject fuel into the first intake flow channel, the second injection structure is used to inject fuel into the contraction flow channel, and the third injection structure is used to inject fuel into the second intake flow channel.

[0007] By adopting the above technical scheme, when the gas enters the rotating detonation combustion chamber, the setting of the contraction flow channel is convenient for increasing the flow rate of the gas when it enters, thereby ensuring the gas transportation efficiency. If only the fuel is added in the second intake flow channel, although it is convenient to ensure the proportion of contact with air, the second intake flow channel and the expansion flow channel have a short stroke and a short mixing time, which is not convenient for achieving efficient and sufficient mixing of the added fuel and the air entering the rotating detonation combustion chamber. The setting of the first injection structure, the second injection structure and the third injection structure to respectively inject fuel into the first intake flow channel, the contraction flow channel and the second intake flow channel in stages along the way makes the fuel injected in the intake channel have a longer stroke when entering the detonation combustion chamber, and the contact time between the fuel and the air in the intake channel is longer, which is convenient for achieving efficient and sufficient mixing of the added fuel in the fuel intake channel and the air entering the rotating detonation combustion chamber, thereby facilitating improving the combustion efficiency in the rotating detonation combustion chamber.

[0008] Optionally, a guide block is fixedly arranged between the inner cylinder and the outer cylinder, and the guide block includes a first straight guide surface, an arc-shaped guide surface and a second straight guide surface which are sequentially connected end to end, and an end of the second straight guide surface away from the arc-shaped guide surface is connected to an end of the first straight guide surface; the outer wall of the inner cylinder is sequentially connected with an inner cylinder extension section, a first connecting section, a second connecting section and a third connecting section from the air intake direction, and the inner wall of the outer cylinder is sequentially connected with an outer cylinder extension section, a fourth connecting section, a fifth connecting section and a The sixth connecting section, the first intake flow channel is located between the inner cylinder extension section and the outer cylinder extension section, the contraction flow channel is located between the first straight guide surface and the fourth connecting section, the second intake flow channel is located between the second connecting section and the fifth connecting section, the expansion flow channel is located between the third connecting section and the sixth connecting section, the first connecting section is arranged in an arc shape, an arc-shaped guide channel is arranged between the guide block and the inner cylinder body, and the arc-shaped guide channel is located in the area enclosed by the second straight guide surface, the arc-shaped guide surface, the first connecting section and the second connecting section.

[0009] By adopting the above technical solution, the setting of the guide block enables the inner cylinder and the outer cylinder to form a Tesla valve structure, thereby realizing a one-way conduction effect during gas transportation, and at the same time separating the forward channel for air and fuel to enter the rotating detonation combustion chamber from the reverse channel for pressure return and combustion product return, effectively reducing the obstacles of pressure return and combustion product return to the forward entering air and fuel, so that the detonation boost can make up for the total pressure loss caused by the upper intake, thereby improving the total pressure gain of the rotating detonation combustion chamber.

[0010] Optionally, a connecting column is fixedly provided on the side away from the first straight guide surface and the second straight guide surface, and a plurality of connecting columns are circumferentially distributed around the axis of the guide block, one end of the connecting column located on the first straight guide surface is connected to the first connecting section, and one end of the connecting column located on the second straight guide surface is connected to the fifth connecting section.

[0011] By adopting the above technical solution, the setting of the connecting column plays a role in stabilizing the position of the guide block, which is convenient for fully ensuring the stability of the position of the guide block, so that the guide block can stably realize the guiding effect on air and fuel.

[0012] Optionally, the first injection structure includes a first atomizing nozzle connected to the first inlet air channel, the second injection structure includes an oil injection hole opened in the inner cylinder or the outer cylinder and connected to the contraction flow channel, and the third injection structure includes a second atomizing nozzle connected to the second inlet air channel.

[0013] By adopting the above technical solution, the arrangement of the first atomizing nozzle and the second atomizing nozzle is conducive to fully ensuring the uniform stability of the fuel when it is delivered into the first intake flow channel and the second intake flow channel and mixed with the air. The arrangement of the oil injection hole makes the structure of delivering the fuel into the contraction flow channel simple and convenient.

[0014] Optionally, a plurality of the first atomizing nozzles, the oil injection holes and the second atomizing nozzles are arranged at intervals in the circumferential direction around the axis of the inner cylinder.

[0015] By adopting the above technical solution, the spaced-apart first atomizing nozzle, the oil injection hole and the second atomizing nozzle facilitate more uniform and stable continuous injection of the fuel, thereby facilitating better mixing and atomization of the fuel with the air. In addition, compared with the single-arranged first atomizing nozzle, the oil injection hole and the second atomizing nozzle, the fault tolerance rate is higher, and the fuel and air can still be mixed when a single component is damaged.

[0016] Optionally, the first injection structure includes an injection rod, and an injection hole connected to the first intake air channel is formed on the outer peripheral surface of the injection rod.

[0017] By adopting the above technical solution, the setting of the injection rod enables the fuel to have stronger penetration performance when injected into the first intake flow channel, which facilitates better initial mixing of the fuel with the incoming gas.

[0018] Optionally, the first injection structure further includes a first atomizing nozzle, and a plurality of the first atomizing nozzles and the injection rods are circumferentially arranged around the axis of the inner cylinder, and the first atomizing nozzles and the injection rods are arranged in an alternating manner.

[0019] By adopting the above technical solution, the staggered first atomizing nozzle and injection rod are conducive to ensuring the penetration performance of the fuel injected into the first intake channel, and further ensure the uniformity of the fuel when injected into the first intake channel, thereby making it easier to ensure the initial mixing effect between the fuel and the incoming gas.

[0020] Optionally, the injection rod includes a fixed rod body and an adjusting rod body, the outer peripheral surface of the fixed rod body is provided with a plurality of fixing holes distributed circumferentially around its own axis, the adjusting rod body rotates coaxially and slides with the fixed rod body, the adjusting rod body is provided with an adjusting hole, the fixed rod body is provided with a positioning part fixedly installed, the adjusting rod body is provided with a positioning hole plug-fitted with the positioning part, there are a plurality of positioning holes distributed circumferentially around the axis of the adjusting rod body, when the positioning part is plug-fitted with one of the positioning holes, the adjusting hole is connected with one of the fixing holes to be combined into an injection hole, and the fixed rod body is provided with a fixing spring to make the adjusting rod body move toward the fixed rod body.

[0021] By adopting the above technical solution, the adjustment rod body is pulled and rotated so that the adjustment hole is aligned with different fixed holes, which facilitates the adjustment of different fuel injection angles. It has strong applicability, and the setting of the fixed spring facilitates rapid movement to the position where the adjustment hole is connected to one of the fixed holes after the position of the adjustment hole is adjusted, and is beneficial to ensuring the stability of the position of the adjustment rod body after the rotation angle is adjusted, thereby facilitating the final stable realization of stable injection of fuel in the first intake flow channel.

[0022] Optionally, the fixed rod body is coaxially rotatably mounted with a rotating plate, and one end of the fixed spring is fixedly connected to the rotating plate, and the other end is fixedly connected to the adjusting rod body.

[0023] By adopting the above technical solution, when the adjusting rod body of the rotating plate rotates, the fixed spring rotates with the adjusting rod body, thereby ensuring the service life of the fixed spring and ensuring the elastic stability of the fixed spring along the axis direction of the adjusting rod body.

[0024] Optionally, a guide block is fixedly arranged between the inner cylinder and the outer cylinder, and the guide block includes a first straight guide surface, a curved guide surface and a second straight guide surface which are sequentially connected end to end, and an end of the second straight guide surface away from the curved guide surface is connected to an end of the first straight guide surface; the outer wall of the inner cylinder is sequentially connected with an inner cylinder extension section, a first connecting section, a second connecting section and a third connecting section from the air intake direction, and the inner wall of the outer cylinder is sequentially connected with an outer cylinder extension section, a fourth connecting section, a fifth connecting section and a sixth connecting section from the air intake direction. The first inlet flow channel is located between the inner cylinder extension section and the outer cylinder extension section, the contraction flow channel is located between the first straight guide surface and the first connecting section, the second inlet flow channel is located between the second connecting section and the fifth connecting section, the expansion flow channel is located between the third connecting section and the sixth connecting section, the fourth connecting section is arranged in an arc shape, an arc-shaped guide channel is arranged between the guide block and the inner cylinder body, the arc-shaped guide channel is located in the area enclosed by the second straight guide surface, the arc-shaped guide surface, the fourth connecting section and the fifth connecting section, and the accommodating chamber is arranged in the inner cylinder body.

[0025] By adopting the above technical scheme, it is convenient to quickly inject the fuel in the accommodating cavity of the inner cylinder into the first intake flow channel, the contraction flow channel and the second intake flow channel. It is also convenient to adapt the shape and size of the inner cylinder and the outer cylinder according to different needs while ensuring efficient and sufficient mixing of the air entering the rotating detonation combustion chamber. It has strong applicability.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The first injection structure, the second injection structure and the third injection structure are used to respectively inject fuel into the first intake flow channel, the contraction flow channel and the second intake flow channel in stages along the way, so that the fuel injected in the intake channel has a longer distance to enter the detonation combustion chamber, and the contact time between the fuel and the air in the intake channel is longer, which is convenient for realizing efficient and full mixing of the fuel added in the fuel intake channel and the air entering the rotating detonation combustion chamber, thereby facilitating the improvement of the combustion efficiency in the rotating detonation combustion chamber.

[0027] 2. The setting of the guide block enables the inner cylinder and the outer cylinder to form a Tesla valve structure, thereby realizing a one-way conduction during gas transportation, and at the same time separating the forward channel for air and fuel to enter the rotating detonation combustion chamber from the reverse channel for pressure return and combustion product return, effectively reducing the obstacles of pressure return and combustion product return to the forward entering air and fuel, so that the detonation boost can make up for the total pressure loss caused by the upper intake, thereby improving the total pressure gain of the rotating detonation combustion chamber.

[0028] 3. Pulling and rotating the adjusting rod body so that the adjusting hole is aligned with different fixed holes can facilitate the adjustment of different fuel injection angles. It has strong applicability, and the setting of the fixed spring is conducive to ensuring the stability of the position of the adjusting rod body after the rotation angle is adjusted, thereby facilitating the final stable realization of stable fuel injection in the first intake flow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application.

[0030] Figure 2 It is a partial cross-sectional schematic diagram of the overall structure in Example 1 of the present application.

[0031] Figure 3 It is a partial cross-sectional schematic diagram of the overall structure in Example 2 of the present application.

[0032] Figure 4 It is a partial cross-sectional schematic diagram of the overall structure in Example 3 of the present application.

[0033] Figure 5 It is a partial cross-sectional stereoscopic schematic diagram of the overall structure in Example 4 of the present application.

[0034] Figure 6 It is a partial cross-sectional stereoscopic schematic diagram of the injection rod in Example 4 of the present application.

[0035] Description of reference numerals: 1. Inner cylinder; 101. Inner cylinder extension; 102. First connection section; 103. Second connection section; 104. Third connection section; 2. Outer cylinder; 201. Outer cylinder extension; 202. Fourth connection section; 203. Fifth connection section; 204. Sixth connection section; 3. Rotary detonation combustion chamber; 4. Intake channel; 401. First intake flow channel; 402. Contraction flow channel; 403. Second intake flow channel; 404. Expansion flow channel; 5. Connecting rod; 6. Accommodation chamber; 7. First Atomizing nozzle; 8. Oil filling hole; 9. Second atomizing nozzle; 10. Injection channel; 11. Air inlet hole; 12. Guide block; 121. First straight guide surface; 122. Arc guide surface; 123. Second straight guide surface; 13. Arc guide channel; 14. Connecting column; 15. Injection rod; 151. Fixed rod body; 152. Adjustment rod body; 16. Fixed hole; 17. Adjustment hole; 18. Injection hole; 19. Rotating plate; 20. Fixed spring; 21. Positioning part; 22. Positioning hole. DETAILED DESCRIPTION

[0036] The following is combined with Figure 1-6 This application is described in further detail.

[0037] An embodiment of the present application discloses a rotating detonation combustion chamber along-the-way staged fuel injection structure.

[0038] Example 1.

[0039] Reference Figure 1 and Figure 2 The fuel injection structure of the rotating detonation combustion chamber 3 includes a accommodating cavity 6 arranged in the intake device. Specifically, the intake device includes an inner cylinder 1 and an outer cylinder 2 that are coaxially fixed. There is a gap between the inner cylinder 1 and the outer cylinder 2, and the gap forms an intake channel 4 connected to the rotating detonation combustion chamber 3.

[0040] Reference Figure 2 The intake channel 4 includes a first intake channel 401, a contraction channel 402, a second intake channel 403 and an expansion channel 404 which are sequentially connected along the intake direction, wherein the first intake channel 401 and the second intake channel 403 both extend along the axial direction of the inner cylinder 1, the cross-sectional size of the contraction channel 402 gradually decreases along the intake direction, and the cross-sectional size of the expansion channel 404 gradually increases along the intake direction, so as to ensure the delivery efficiency of the gas into the rotating detonation combustion chamber 3.

[0041] Specifically, the outer wall of the inner cylinder 1 is connected with the inner cylinder extension section 101, the first connection section 102, the second connection section 103 and the third connection section 104 in sequence from the air intake direction, the inner wall of the outer cylinder 2 is connected with the outer cylinder extension section 201, the fourth connection section 202, the fifth connection section 203 and the sixth connection section 204 in sequence from the air intake direction, the first intake flow channel 401 is located between the inner cylinder extension section 101 and the outer cylinder extension section 201, the contraction flow channel 402 is located between the first connection section 102 and the fourth connection section 202, the second intake flow channel 403 is located between the second connection section 103 and the fifth connection section 203, and the expansion flow channel 404 is located between the third connection section 104 and the sixth connection section 204. In order to ensure the stability of the relative position between the inner cylinder 1 and the outer cylinder 2, a connecting rod 5 is fixedly arranged between the first connection section 102 and the fourth connection section 202, and a plurality of connecting rods 5 are evenly arranged circumferentially around the axis of the inner cylinder 1.

[0042] Continue to refer to Figure 2In the embodiment of the present application, the accommodating chamber 6 is arranged in the outer cylinder 2, and the accommodating chamber 6 is provided with a first injection structure, a second injection structure and a third injection structure in sequence along the intake direction, wherein the first injection structure is used to inject fuel into the first intake air channel 401, the second injection structure is used to inject fuel into the contraction flow channel 402, and the third injection structure is used to inject fuel into the second intake air channel 403. The first injection structure includes a first atomizing nozzle 7 connected to the first intake air channel 401, the second injection structure includes an oil injection hole 8 opened in the outer cylinder 2 and connected to the contraction flow channel 402 and the accommodating chamber 6, and the third injection structure includes a second atomizing nozzle 9 connected to the second intake air channel 403. The first atomizing nozzle 7 and the second atomizing nozzle 9 are both connected to the accommodating chamber 6 through pipes to ensure the uniform stability of the fuel when it is mixed with the air in the first intake air channel 401 and the second intake air channel 403. The setting of the oil injection hole 8 makes the structure of the fuel being fed into the contraction flow channel 402 simple and convenient. An atomizing nozzle can also be set in the oil injection hole 8 to further ensure the uniformity of the fuel when it is injected into the contraction flow channel 402.

[0043] There are multiple groups of first atomizing nozzles 7, oil injection holes 8 and second atomizing nozzles 9 arranged at circumferential intervals around the axis of the inner cylinder 1. In the embodiment of the present application, each group of first atomizing nozzles 7, oil injection holes 8 and second atomizing nozzles 9 has three distributed along the axis of the inner cylinder 1 to facilitate more uniform and stable continuous injection of fuel.

[0044] Continue to refer to Figure 2 In addition, the outer cylinder 2 is also provided with an ejection channel 10, which extends to one end of the outer cylinder 2 close to the rotating detonation combustion chamber 3. The first intake flow channel 401 and the second intake flow channel 403 are both provided with an intake hole 11 connected to the ejection channel 10. A plurality of groups of intake holes 11 are circumferentially spaced around the axis of the inner cylinder 1. In the embodiment of the present application, each group of intake holes 11 is distributed along the axis of the inner cylinder 1, and each intake hole 11 is staggeredly distributed with the first atomizing nozzle 7 and the second atomizing nozzle 9 around the axis of the inner cylinder 1.

[0045] When detonation occurs in the rotating detonation combustion chamber 3, the high-pressure air transmitted back by the detonation wave and the input air that cannot continue to enter the rotating detonation combustion chamber 3 due to the impact of the detonation wave are collected through the air inlet 11 and flow into the ejection channel 10, and are ejected through the opening at one end of the ejection channel 10, thereby increasing the thrust and expanding the pressure difference between the incoming flow pressure and the outlet of the channel in the rotating detonation combustion chamber 3, which is conducive to the subsequent mixing of fuel and air and the continuous supply and input of the explosive mixture.

[0046] The implementation principle of Example 1 of the present application is as follows: the setting of the contraction flow channel 402 is convenient for increasing the flow rate of the gas when entering the rotating detonation combustion chamber 3, which is beneficial to ensuring the gas delivery efficiency, and the setting of the first intake flow channel 401, the contraction flow channel 402 and the second intake flow channel 403 are respectively sprayed with fuel along the way through the first injection structure, the second injection structure and the third injection structure, so that the fuel injected in the intake channel 4 has a longer distance entering the detonation combustion chamber, and the contact time between the fuel and the air in the intake channel 4 is longer, which is convenient for realizing the efficient and sufficient mixing of the fuel added in the fuel intake channel 4 and the air entering the rotating detonation combustion chamber 3, which is beneficial to improving the combustion efficiency in the rotating detonation combustion chamber 3.

[0047] Example 2.

[0048] Reference Figure 3 The difference between this embodiment and embodiment 1 is that a guide block 12 is further arranged between the inner cylinder 1 and the outer cylinder 2, wherein the guide block 12 includes a first straight guide surface 121, an arcuate guide surface 122 and a second straight guide surface 123 which are sequentially connected end to end, an end of the second straight guide surface 123 away from the arcuate guide surface 122 is connected to an end of the first straight guide surface 121, and the contraction flow channel 402 is located between the first straight guide surface 121 and the first connecting section 102. An arcuate guide channel 13 is arranged between the guide block 12 and the inner cylinder 1, the first connecting section 102 is arranged in an arc shape, and the arcuate guide channel 13 is located in the area surrounded by the second straight guide surface 123, the arcuate guide surface 122, the first connecting section 102 and the second connecting section 103, and the accommodating chamber 6 is arranged in the outer cylinder 2, so as to realize the rapid and stable injection of fuel on the basis of setting the injection channel 10.

[0049] Continue to refer to Figure 3 In order to further ensure the stability of the position of the guide block 12, a connecting column 14 is fixedly arranged on the side away from the first straight guide surface 121 and the second straight guide surface 123. A plurality of connecting columns 14 are evenly distributed circumferentially around the axis of the guide block 12. The end of the connecting column 14 located on the first straight guide surface 121 away from the first straight guide surface 121 is connected to the first connecting section 102, and the end of the connecting column 14 located on the second straight guide surface 123 away from the second straight guide surface 123 is connected to the fifth connecting section 203, so as to play a role in stabilizing the position of the guide block 12.

[0050] The implementation principle of Example 2 is as follows: the implementation principle of the embodiment of the present application is the same as that of Example 1. On this basis, the inner cylinder 1 and the outer cylinder 2 form a Tesla valve structure through the setting of the guide block 12, thereby realizing a one-way conduction effect during gas transportation, and at the same time separating the forward channel for air and fuel to enter the rotating detonation combustion chamber 3 from the reverse channel for pressure return and combustion product return, effectively reducing the obstacles of pressure return and combustion product return to the forward entering air and fuel, so that the detonation boost can make up for the total pressure loss caused by the upper intake, thereby improving the total pressure gain of the rotating detonation combustion chamber 3.

[0051] Example 3.

[0052] Reference Figure 4 The main difference between the embodiment of the present application and the embodiment 1 is that the ejection channel 10 is not provided and the guide block 12 is provided between the inner cylinder 1 and the outer cylinder 2, wherein the guide block 12 includes a first straight guide surface 121, an arcuate guide surface 122 and a second straight guide surface 123 which are connected end to end in sequence, and one end of the second straight guide surface 123 away from the arcuate guide surface 122 is connected to one end of the first straight guide surface 121, and the contraction flow channel 402 is located between the first straight guide surface 121 and the fourth connecting section 202. An arcuate guide channel 13 is provided between the guide block 12 and the inner cylinder 1, the fourth connecting section 202 is provided in an arc shape, and the arcuate guide channel 13 is located in the area surrounded by the second straight guide surface 123, the arcuate guide surface 122, the fourth connecting section 202 and the fifth connecting section 203, and the accommodating chamber 6 is provided in the inner cylinder 1, so as to realize the rapid and stable injection of fuel without providing the ejection channel 10.

[0053] Continue to refer to Figure 4 In order to further ensure the stability of the position of the guide block 12, a connecting column 14 is fixedly arranged on the side away from the first straight guide surface 121 and the second straight guide surface 123. A plurality of connecting columns 14 are evenly distributed circumferentially around the axis of the guide block 12. The end of the connecting column 14 located on the first straight guide surface 121 away from the first straight guide surface 121 is connected to the first connecting section 102, and the end of the connecting column 14 located on the second straight guide surface 123 away from the second straight guide surface 123 is connected to the fifth connecting section 203, so as to play a role in stabilizing the position of the guide block 12.

[0054] The implementation principle of Example 3 of the present application is the same as that of Example 1, and the additional technical effects are the same as the additional technical effects of Example 2. The main difference from Example 2 is that the setting position of the accommodating chamber 6 is different, which facilitates the adaptive adjustment of the shape and size of the inner cylinder 1 and the outer cylinder 2 according to different needs while ensuring efficient and sufficient mixing of the air entering the rotating detonation combustion chamber 3, and has strong applicability.

[0055] Example 4.

[0056] Reference Figure 5 and Figure 6 The main difference between the embodiment of the present application and the embodiment 1 is that the structure of the first injection structure is different. In the embodiment of the present application, the first injection structure also includes an injection rod 15, and the injection rod 15 includes a fixed rod body 151 and an adjustment rod body 152, wherein the outer circumference of the fixed rod body 151 is provided with a plurality of fixed holes 16 evenly distributed around its own axis. The adjustment rod body 152 rotates coaxially and slides with the fixed rod body 151, and the outer circumference of the adjustment rod body 152 is provided with an adjustment hole 17 corresponding to the fixed rod body 151. When the adjustment hole 17 rotates to a position corresponding to one of the fixed holes 16, the adjustment hole 17 is connected with one of the fixed holes 16 to form an injection hole 18 connected with the first intake channel 401, so that the fuel has a stronger penetration performance when injected into the first intake channel 401, which is convenient for the fuel to achieve a better initial mixing with the incoming gas.

[0057] Reference Figure 6 In order to facilitate the rapid adjustment of the adjustment hole 17 to the position where it is connected to one of the fixed holes 16 and to ensure the stability of the position of the adjustment block after adjustment, a rotating plate 19 is rotatably installed on the fixed rod, and a fixing spring 20 is arranged between the rotating plate 19 and the adjusting rod body 152. The fixing spring 20 is sleeved outside the fixing rod body 151, and the fixing spring 20 is fixedly connected to the rotating plate 19, and the other end is fixedly connected to the adjusting rod body 152, so that the adjusting rod body 152 moves to the position where it is connected to one of the fixed holes 16 under the elastic force of the fixing spring 20.

[0058] Continue to refer to Figure 6 The fixed rod body 151 is provided with a plurality of positioning parts 21 which are evenly distributed around its own axis. The bottom of the adjusting rod body 152 is provided with positioning holes 22 which correspond to the positioning parts 21 one by one and are respectively plugged into each positioning hole 22. When each positioning part 21 is plugged into each positioning hole 22, the adjusting rod body 152 covers the fixed spring 20, and the adjusting hole 17 is connected with one of the fixed holes 16. The cooperation between the positioning part 21 and the positioning hole 22 plays a role in limiting the position of the adjusting rod body 152 after rotation. The covering of the fixing spring 20 by the adjusting rod body 152 facilitates the protection of the fixing spring 20 and ensures the performance of the fixing spring 20.

[0059] Reference Figure 5 and Figure 6 There are multiple first atomizing nozzles 7 and injection rods 15 evenly arranged around the axis of the inner cylinder 1, and the first atomizing nozzles 7 and the injection rods 15 are staggered to ensure the penetration performance of the fuel injected into the first intake channel 401, and further ensure the uniformity of the fuel when injected into the first intake channel 401.

[0060] The implementation principle of Example 4 of the present application is the same as that of Example 1. On this basis, the setting of the injection rod 15 allows the fuel to have stronger penetration performance when injected into the first intake flow channel 401, which facilitates better initial mixing of the fuel with the incoming gas. At the same time, by pulling and rotating the adjusting rod body 152 so that the adjusting hole 17 is opposite to different fixed holes 16, it is convenient to adjust different injection angles of the fuel, which is convenient for adjustment according to different injection conditions and has strong applicability.

[0061] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A rotating detonation combustion chamber along-the-way staged fuel injection structure, characterized in that: The invention comprises a containing chamber (6) arranged in an air intake device, wherein the containing chamber (6) is used to contain fuel, wherein the air intake device comprises an inner cylinder (1) and an outer cylinder (2) which are coaxially fixedly arranged, wherein a gap between the inner cylinder (1) and the outer cylinder (2) forms an air intake passage (4) which is connected to a rotating detonation combustion chamber (3), wherein the air intake passage (4) comprises a first air intake passage (401), a contraction passage (402), a second air intake passage (403) and an expansion passage (404) which are sequentially connected and arranged along an air intake direction. The cross-sectional size of the contraction flow channel (402) gradually decreases, and the cross-sectional size of the expansion flow channel (404) gradually increases. The accommodating cavity (6) is provided with a first injection structure, a second injection structure and a third injection structure in sequence along the intake direction. The first injection structure is used to inject fuel into the first intake flow channel (401), the second injection structure is used to inject fuel into the contraction flow channel (402), and the third injection structure is used to inject fuel into the second intake flow channel (403).

2. The rotating detonation combustion chamber along-the-way staged fuel injection structure according to claim 1, characterized in that: A guide block (12) is fixedly arranged between the inner cylinder (1) and the outer cylinder (2), and the guide block (12) comprises a first straight guide surface (121), an arc-shaped guide surface (122) and a second straight guide surface (123) which are sequentially connected end to end, and an end of the second straight guide surface (123) away from the arc-shaped guide surface (122) is connected to an end of the first straight guide surface (121); the outer wall of the inner cylinder (1) is sequentially connected with an inner cylinder extension section (101), a first connecting section (102), a second connecting section (103) and a third connecting section (104) from the air intake direction, and the inner wall of the outer cylinder (2) is sequentially connected with an outer cylinder extension section (201), a fourth connecting section (202), a fifth connecting section (203) and a sixth connecting section (204) from the air intake direction, The first inlet flow channel (401) is located between the inner cylinder extension section (101) and the outer cylinder extension section (201), the contraction flow channel (402) is located between the first straight guide surface (121) and the fourth connecting section (202), the second inlet flow channel (403) is located between the second connecting section (103) and the fifth connecting section (203), the expansion flow channel (404) is located between the third connecting section (104) and the sixth connecting section (204), the first connecting section (102) is arranged in an arc shape, an arc-shaped guide channel (13) is arranged between the guide block (12) and the inner cylinder body (1), and the arc-shaped guide channel (13) is located in an area surrounded by the second straight guide surface (123), the arc-shaped guide surface (122), the first connecting section (102) and the second connecting section (103).

3. The rotating detonation combustion chamber along-the-way staged fuel injection structure according to claim 2, characterized in that: A connecting column (14) is fixedly arranged on the side away from the first straight guide surface (121) and the second straight guide surface (123), and a plurality of the connecting columns (14) are circumferentially distributed around the axis of the guide block (12), one end of the connecting column (14) located on the first straight guide surface (121) is connected to the first connecting section (102), and one end of the connecting column (14) located on the second straight guide surface (123) is connected to the fifth connecting section (203).

4. The rotating detonation combustion chamber along-the-way staged fuel injection structure according to claim 1, characterized in that: The first injection structure comprises a first atomizing nozzle (7) connected to the first inlet flow channel (401), the second injection structure comprises an oil injection hole (8) opened in the inner cylinder (1) or the outer cylinder (2) and connected to the contraction flow channel (402), and the third injection structure comprises a second atomizing nozzle (9) connected to the second inlet flow channel (403).

5. The rotating detonation combustion chamber along-the-way staged fuel injection structure according to claim 4, characterized in that: A plurality of the first atomizing nozzles (7), the oil injection holes (8) and the second atomizing nozzles (9) are arranged at intervals in the circumferential direction around the axis of the inner cylinder (1).

6. The rotating detonation combustion chamber along-the-way staged fuel injection structure according to claim 1, characterized in that: The first injection structure comprises an injection rod (15), and an injection hole (18) which is connected to the first inlet flow channel (401) is formed on the outer peripheral surface of the injection rod (15).

7. The rotating detonation combustion chamber along-the-way staged fuel injection structure according to claim 6, characterized in that: The first injection structure also includes a first atomizing nozzle (7), and a plurality of the first atomizing nozzles (7) and the injection rods (15) are arranged circumferentially around the axis of the inner cylinder (1), and the first atomizing nozzles (7) and the injection rods (15) are arranged in a staggered manner.

8. The rotating detonation combustion chamber along-the-way staged fuel injection structure according to claim 6, characterized in that: The injection rod (15) comprises a fixed rod body (151) and an adjusting rod body (152); the outer circumferential surface of the fixed rod body (151) is provided with a plurality of fixing holes (16) distributed circumferentially around its own axis; the adjusting rod body (152) coaxially rotates and slidably fits with the fixed rod body (151); the adjusting rod body (152) is provided with an adjusting hole (17); the fixed rod body (151) is provided with a positioning portion (21) fixedly mounted thereon; the adjusting rod body (152) is provided with a A positioning hole (22) plug-fitted with the positioning portion (21), wherein a plurality of positioning holes (22) are circumferentially distributed around the axis of the adjusting rod body (152); when the positioning portion (21) is plug-fitted with one of the positioning holes (22), the adjusting hole (17) is connected with one of the fixing holes (16) to form an injection hole (18); and the fixing rod body (151) is provided with a fixing spring (20) for moving the adjusting rod body (152) toward the fixing rod body (151).

9. The rotating detonation combustion chamber along-the-way staged fuel injection structure according to claim 8, characterized in that: The fixed rod body (151) is coaxially rotatably mounted with a rotating plate (19); one end of the fixed spring (20) is fixedly connected to the rotating plate (19) and the other end is fixedly connected to the adjusting rod body (152).

10. The rotating detonation combustion chamber along-the-way staged fuel injection structure according to claim 1, characterized in that: A guide block (12) is fixedly arranged between the inner cylinder (1) and the outer cylinder (2), and the guide block (12) comprises a first straight guide surface (121), an arc-shaped guide surface (122) and a second straight guide surface (123) which are sequentially connected end to end, and an end of the second straight guide surface (123) away from the arc-shaped guide surface (122) is connected to an end of the first straight guide surface (121); the outer wall of the inner cylinder (1) is sequentially connected with an inner cylinder extension section (101), a first connecting section (102), a second connecting section (103) and a third connecting section (104) from the air intake direction, and the inner wall of the outer cylinder (2) is sequentially connected with an outer cylinder extension section (201), a fourth connecting section (202), a fifth connecting section (203) and a sixth connecting section (204) from the air intake direction, and the first intake flow passage (4 01) is located between the inner cylinder extension section (101) and the outer cylinder extension section (201), the contraction flow channel (402) is located between the first straight guide surface (121) and the first connecting section (102), the second inlet flow channel (403) is located between the second connecting section (103) and the fifth connecting section (203), the expansion flow channel (404) is located between the third connecting section (104) and the sixth connecting section (204), the fourth connecting section (202) is arranged in an arc shape, an arc-shaped guide channel (13) is arranged between the guide block (12) and the inner cylinder (1), the arc-shaped guide channel (13) is located in an area surrounded by the second straight guide surface (123), the arc-shaped guide surface (122), the fourth connecting section (202) and the fifth connecting section (203), and the accommodating chamber (6) is arranged in the inner cylinder (1).

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