Rotating detonation combustion chamber in-line staged fuel injection structure

Abstract

The application discloses a fuel injection structure of a rotary detonation combustion chamber, and belongs to the technical field of fuel injection. The fuel injection structure comprises a containing cavity arranged on an air inlet device, the containing cavity is used for containing fuel, the air inlet device comprises an inner cylinder and an outer cylinder, 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 second air inlet flow channel. The application has the effect of facilitating efficient and sufficient mixing of fuel added in the air inlet channel and air entering the rotary detonation combustion chamber, and improving the combustion efficiency in the rotary detonation combustion chamber.

Description

Technical Field

[0001] This invention relates to the field of fuel injection, and in particular to a rotary detonation combustion chamber staged fuel injection structure. Background Technology

[0002] The rotating detonation combustor is an advanced combustion technology device characterized by high-efficiency combustion, compact structure, and strong thrust. Its main working principle is to improve combustion efficiency by consuming the fuel / air mixture through near-isochoric combustion. Specifically, when the fuel and air mixture is injected into the detonation chamber through the intake device, it instantly detonates, generating a shock wave coupled with a chemical reaction zone, forming a detonation wave. The high-temperature combustion products drive the shock wave forward, thus propelling the detonation wave to rotate within the combustion chamber.

[0003] During operation, the rotary detonation combustion chamber typically requires fuel to be added near the intake device. Specifically, the intake device usually includes an inner cylinder and an outer cylinder fixed coaxially. The gap between the inner and outer cylinders forms an intake channel that communicates with the rotary detonation combustion chamber. The intake channel includes an intake flow channel and an expansion flow channel that are sequentially connected in the intake direction. The cross-sectional size of the expansion flow channel gradually increases and communicates with the rotary detonation combustion chamber. To ensure the proportion of fuel in contact with air after addition, the fuel is usually injected at the free end of the intake flow channel near the expansion flow channel.

[0004] Regarding the aforementioned technologies, the fuel injected into the intake channel is not easily mixed efficiently and fully with the air entering the rotary detonation combustion chamber, resulting in low combustion efficiency within the rotary detonation combustion chamber. Summary of the Invention

[0005] In order to facilitate efficient and thorough mixing of fuel added in the intake passage with the air entering the rotary detonation combustion chamber and improve the combustion efficiency in the rotary detonation combustion chamber, this application provides a rotary detonation combustion chamber staged fuel injection structure.

[0006] This application provides a rotary detonation combustion chamber staged fuel injection structure, which adopts the following technical solution:

[0007] A rotary detonation combustion chamber staged fuel injection structure includes a receiving cavity disposed in an intake device for containing fuel. The intake device includes an inner cylinder and an outer cylinder coaxially fixedly disposed. The gap between the inner cylinder and the outer cylinder forms an intake channel communicating with the rotary detonation combustion chamber. The intake channel includes a first intake channel, a contraction channel, a second intake channel, and an expansion channel sequentially connected along the intake direction. The cross-sectional size of the contraction channel gradually decreases, and the cross-sectional size of the expansion channel gradually increases. The receiving cavity 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 channel, the second injection structure is used to inject fuel into the contraction channel, and the third injection structure is used to inject fuel into the second intake channel.

[0008] By adopting the above technical solution, the gas flow rate is increased when entering the rotary detonation combustion chamber due to the constriction channel, ensuring gas delivery efficiency. If fuel is added only in the second intake channel, although it is convenient to ensure the contact ratio with air, the stroke of the second intake channel and the expansion channel is short, and the mixing time is short, which is not conducive to achieving efficient and sufficient mixing of the added fuel and the air entering the rotary detonation combustion chamber. However, by setting the first injection structure, the second injection structure, and the third injection structure to inject fuel in stages along the first intake channel, the constriction channel, and the second intake channel respectively, the fuel injected in the intake channel has a longer stroke into the detonation combustion chamber, and the contact time between the fuel and the air in the intake channel is longer. This facilitates efficient and sufficient mixing of the added fuel in the fuel intake channel and the air entering the rotary detonation combustion chamber, thereby improving the combustion efficiency in the rotary detonation combustion chamber.

[0009] Optionally, a guide block is fixedly disposed between the inner cylinder and the outer cylinder. The guide block includes a first straight guide surface, an arc-shaped guide surface, and a second straight guide surface connected end to end in sequence. The end of the second straight guide surface away from the arc-shaped guide surface is connected to one 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. 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 third connecting section from the air intake direction. The sixth connecting section has the first air intake channel located between the inner cylinder extension section and the outer cylinder extension section, the contraction channel located between the first straight guide surface and the fourth connecting section, the second air intake channel located between the second connecting section and the fifth connecting section, and the expansion channel located between the third connecting section and the sixth connecting section. The first connecting section is arc-shaped, and an arc-shaped guide channel is provided between the guide block and the inner cylinder. The arc-shaped guide channel is located within the area enclosed by the second straight guide surface, the arc-shaped guide surface, the first connecting section, and the second connecting section.

[0010] By adopting the above technical solution, the guide block is set so that the inner cylinder and the outer cylinder form a Tesla valve structure, thereby realizing the unidirectional conduction effect during gas transportation. At the same time, it separates the forward channel for air and fuel to enter the rotary detonation combustion chamber from the reverse channel for pressure return and combustion product return, effectively reducing the obstruction of pressure return and combustion product return on the forward-entering air and fuel. This allows the detonation pressurization to compensate for the total pressure loss generated by the upper intake, thereby improving the total pressure gain of the rotary detonation combustion chamber.

[0011] Optionally, a connecting column is fixedly provided on the side of the first straight guide surface and the second straight guide surface that are far apart from each other. Multiple connecting columns are distributed circumferentially 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 segment, and one end of the connecting column located on the second straight guide surface is connected to the fifth connecting segment.

[0012] By adopting the above technical solution, the connecting column plays a stabilizing and limiting role in the position of the guide block, which makes it easy to fully ensure the stability of the position of the guide block, thereby enabling the guide block to stably guide the flow of air and fuel.

[0013] Optionally, the first injection structure includes a first atomizing nozzle connected to the first air intake channel, the second injection structure includes an oil injection hole opened in the inner cylinder or outer cylinder and connected to the contraction channel, and the third injection structure includes a second atomizing nozzle connected to the second air intake channel.

[0014] By adopting the above technical solution, the setting of the first atomizing nozzle and the second atomizing nozzle is conducive to ensuring the uniformity and stability of the fuel when it is fed into the first and second air intake channels and mixed with air. The setting of the oil injection hole makes the structure of feeding fuel into the contraction channel simple and convenient.

[0015] Optionally, the first atomizing nozzle, the oil injection hole, and the second atomizing nozzle are all provided in multiple circumferentially spaced around the axis of the inner cylinder.

[0016] By adopting the above technical solution, the spaced first atomizing nozzle, oil injection hole and second atomizing nozzle can achieve more uniform and stable continuous injection of fuel, which in turn facilitates better mixing and atomization of fuel with air. Moreover, compared with a single first atomizing nozzle, oil injection hole and second atomizing nozzle, the fault tolerance is higher, and the mixing of fuel and air can still be achieved when a single component is damaged.

[0017] Optionally, the first injection structure includes an injection rod, and the outer peripheral surface of the injection rod is provided with an injection hole that is connected to the first air inlet channel.

[0018] 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 inlet air passage, which facilitates better initial mixing of the fuel with the introduced gas.

[0019] Optionally, the first injection structure further includes a first atomizing nozzle, and multiple atomizing nozzles and injection rods are arranged circumferentially around the axis of the inner cylinder, and the first atomizing nozzles and injection rods are arranged alternately.

[0020] By adopting the above technical solution, the staggered arrangement of the first atomizing nozzle and injection rod not only helps to ensure the penetration performance of fuel injection into the first air intake channel, but also further ensures the uniformity of fuel injection into the first air intake channel, thereby making it easier to ensure the initial mixing effect between fuel and gas.

[0021] Optionally, the injection rod includes a fixed rod body and an adjusting rod body. The outer circumferential surface of the fixed rod body has several 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 has an adjusting hole. The fixed rod body is fixedly equipped with a positioning part. The adjusting rod body has a positioning hole that is inserted and fitted with the positioning part. Multiple positioning holes are distributed circumferentially around the axis of the adjusting rod body. When the positioning part is inserted and fitted into one of the positioning holes, the adjusting hole is connected to one of the fixing holes to form an injection hole. The fixed rod body is equipped with a fixing spring that moves the adjusting rod body toward the fixed rod body.

[0022] By adopting the above technical solution, pulling and rotating the adjusting rod so that the adjusting hole is aligned with different fixed holes can easily achieve the adjustment of different fuel injection angles. It has strong applicability, and the setting of the fixed spring makes it easy to quickly move to the position when it is connected to one of the fixed holes after the position of the adjusting hole is adjusted. It also helps to ensure the stability of the position of the adjusting rod after the rotation angle is adjusted, thus facilitating the stable injection of fuel in the first air intake channel.

[0023] Optionally, a rotating plate is coaxially mounted on the fixed rod, 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.

[0024] By adopting the above technical solution, when the adjusting rod of the rotating plate rotates, the fixed spring rotates together with the adjusting rod, thereby ensuring the service life of the fixed spring and ensuring the elastic stability of the fixed spring along the axis of the adjusting rod.

[0025] Optionally, a flow guide block is fixedly disposed between the inner cylinder and the outer cylinder. The flow guide block includes a first straight flow guide surface, an arc-shaped flow guide surface, and a second straight flow guide surface connected end to end in sequence. The end of the second straight flow guide surface away from the arc-shaped flow guide surface is connected to one end of the first straight flow guide surface. The outer wall of the inner cylinder is provided with an inner cylinder extension section, a first connecting section, a second connecting section, and a third connecting section connected in sequence from the air intake direction. The inner wall of the outer cylinder is provided with an outer cylinder extension section, a fourth connecting section, a fifth connecting section, and a sixth connecting section connected in sequence from the air intake direction. The first air inlet channel is located between the inner cylinder extension section and the outer cylinder extension section; the contraction channel is located between the first straight guide surface and the first connecting section; the second air inlet channel is located between the second connecting section and the fifth connecting section; the expansion channel is located between the third connecting section and the sixth connecting section; the fourth connecting section is arc-shaped; an arc-shaped guide channel is provided between the guide block and the inner cylinder; the arc-shaped guide channel is located within 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 receiving cavity is located within the inner cylinder.

[0026] By adopting the above technical solution, it is convenient to quickly inject fuel from the inner cylinder into the first air intake channel, the contraction channel and the second air intake channel. It is also convenient to adapt the shape and size of the inner and outer cylinders to different needs while ensuring efficient and sufficient mixing of air entering the rotary detonation combustion chamber. It has strong applicability.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. By using the first injection structure, the second injection structure, and the third injection structure to inject fuel in stages along the first intake channel, the contraction channel, and the second intake channel respectively, the fuel injected in the intake channel has a longer travel distance into the detonation combustion chamber, and the contact time between the fuel and the air in the intake channel is longer. This facilitates efficient and thorough mixing of the fuel added in the fuel intake channel with the air entering the rotary detonation combustion chamber, thereby improving the combustion efficiency in the rotary detonation combustion chamber.

[0029] 2. The guide block configuration enables the inner and outer cylinders to form a Tesla valve structure, thereby achieving unidirectional flow during gas delivery. At the same time, it separates the forward channel for air and fuel to enter the rotary detonation combustion chamber from the reverse channel for pressure return and combustion product return, effectively reducing the obstruction of pressure return and combustion product return on the forward-entering air and fuel. This allows the detonation boosting to compensate for the total pressure loss generated by the upper intake, thereby increasing the total pressure gain of the rotary detonation combustion chamber.

[0030] 3. Pulling and rotating the adjusting rod so that the adjusting hole is aligned with different fixed holes facilitates the adjustment of different fuel injection angles. It is highly applicable, and the setting of the fixed spring helps to ensure the stability of the position of the adjusting rod after the rotation angle is adjusted, thus facilitating the stable injection of fuel in the first air intake channel. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0032] Figure 2 This is a partial cross-sectional schematic diagram of the overall structure in Embodiment 1 of this application.

[0033] Figure 3 This is a partial cross-sectional schematic diagram of the overall structure in Embodiment 2 of this application.

[0034] Figure 4 This is a partial cross-sectional view of the overall structure in Embodiment 3 of this application.

[0035] Figure 5 This is a partial cross-sectional perspective view of the overall structure in Embodiment 4 of this application.

[0036] Figure 6 This is a partial cross-sectional perspective view of the injection rod in Embodiment 4 of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Inner cylinder; 101. Inner cylinder extension section; 102. First connecting section; 103. Second connecting section; 104. Third connecting section; 2. Outer cylinder; 201. Outer cylinder extension section; 202. Fourth connecting section; 203. Fifth connecting section; 204. Sixth connecting section; 3. Rotary detonation combustion chamber; 4. Intake passage; 401. First intake passage; 402. Contraction passage; 403. Second intake passage; 404. Expansion passage; 5. Connecting rod; 6. Receiving cavity; 7. First 8. Atomizing nozzle; 9. Oil filling hole; 10. Second atomizing nozzle; 11. Injection channel; 12. Air inlet; 13. Guide block; 14. First straight guide surface; 15. Arc-shaped guide surface; 16. Second straight guide surface; 17. Arc-shaped guide channel; 18. Connecting column; 19. Injection rod; 10. Fixed rod body; 11. Adjusting rod body; 12. Fixed hole; 13. Adjusting hole; 14. Injection hole; 15. Rotating plate; 26. Fixed spring; 27. Positioning part; 28. Positioning hole. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0040] This application discloses a rotary detonation combustion chamber staged fuel injection structure.

[0041] Example 1.

[0042] Reference Figure 1 and Figure 2 The fuel injection structure of the rotary detonation combustion chamber 3 includes a receiving cavity 6 disposed in the air intake device. Specifically, the air intake device includes an inner cylinder 1 and an outer cylinder 2 coaxially fixedly disposed. There is a gap between the inner cylinder 1 and the outer cylinder 2, and the gap forms an air intake channel 4 that communicates with the rotary detonation combustion chamber 3.

[0043] 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 that are sequentially connected along the intake direction. 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 dimension of the contraction channel 402 gradually decreases along the intake direction, while the cross-sectional dimension of the expansion channel 404 gradually increases along the intake direction, so as to ensure the efficiency of gas delivery to the rotating detonation combustion chamber 3.

[0044] Specifically, 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. 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 air intake channel 401 is located between the inner cylinder extension section 101 and the outer cylinder extension section 201. The contraction channel 402 is located between the first connecting section 102 and the fourth connecting section 202. The second air intake channel 403 is located between the second connecting section 103 and the fifth connecting section 203. The expansion channel 404 is located between the third connecting section 104 and the sixth connecting section 204. To ensure the stability of the relative position between the inner cylinder 1 and the outer cylinder 2, a connecting rod 5 is fixedly installed between the first connecting section 102 and the fourth connecting section 202. Multiple connecting rods 5 are evenly arranged circumferentially around the axis of the inner cylinder 1.

[0045] Continue to refer to Figure 2In this embodiment of the application, the receiving cavity 6 is disposed in the outer cylinder 2. The receiving cavity 6 is provided with a first injection structure, a second injection structure and a third injection structure in sequence along the air intake direction. The first injection structure is used to inject fuel into the first air intake channel 401, the second injection structure is used to inject fuel into the constriction channel 402, and the third injection structure is used to inject fuel into the second air intake channel 403. The first injection structure includes a first atomizing nozzle 7 connected to the first air intake channel 401. The second injection structure includes an oil injection hole 8 opened in the outer cylinder 2 and connected to the contraction channel 402 and the receiving cavity 6. The third injection structure includes a second atomizing nozzle 9 connected to the second air intake channel 403. Both the first atomizing nozzle 7 and the second atomizing nozzle 9 are connected to the receiving cavity 6 through pipes to ensure the uniformity and stability of the fuel when it is fed into the first air intake channel 401 and the second air intake channel 403 and mixed with air. The setting of the oil injection hole 8 makes the structure of feeding fuel into the contraction channel 402 simple and convenient. An atomizing nozzle can also be set in the oil injection hole 8 to further ensure the uniformity of fuel injection into the contraction channel 402.

[0046] The first atomizing nozzle 7, the oil injection hole 8, and the second atomizing nozzle 9 are all arranged in multiple sets around the axis of the inner cylinder 1. In this embodiment, each set of the first atomizing nozzle 7, the oil injection hole 8, and the second atomizing nozzle 9 is distributed in three along the axis of the inner cylinder 1, so as to achieve more uniform and stable continuous fuel injection.

[0047] Continue to refer to Figure 2 In addition, the outer cylinder 2 is also provided with an ejector channel 10, which extends to one end of the outer cylinder 2 near the rotating detonation combustion chamber 3. The first air intake channel 401 and the second air intake channel 403 are both provided with air intake holes 11 that are connected to the ejector channel 10. Multiple sets of air intake holes 11 are arranged circumferentially around the axis of the inner cylinder 1. In this embodiment, each set of air intake holes 11 has three distributed along the axis of the inner cylinder 1. Each air intake hole 11 is staggered with the first atomizing nozzle 7 and the second atomizing nozzle 9 around the axis of the inner cylinder 1.

[0048] During detonation in the rotating detonation combustion chamber 3, the high-pressure air returned by the detonation wave and the input air that cannot continue to enter the rotating detonation combustion chamber 3 due to the influence of the detonation wave are all collected through the air inlet 11 and flow into the ejector channel 10, and are ejected through the opening at one end of the ejector channel 10. This increases the thrust and widens the pressure difference between the incoming flow pressure and the outlet of the channel in the rotating detonation combustion chamber 3, which helps to continuously supply the subsequent fuel and air mixing and the explosive mixture.

[0049] The implementation principle of Embodiment 1 of this application is as follows: The setting of the contraction channel 402 facilitates the increase of the flow velocity of gas when entering the rotary detonation combustion chamber 3, which is beneficial to ensuring gas delivery efficiency. Furthermore, the setting of the first injection structure, the second injection structure, and the third injection structure to inject fuel in stages along the path into the first intake channel 401, the contraction channel 402, and the second intake channel 403 respectively makes the fuel injected in the intake channel 4 travel a longer distance into the detonation combustion chamber, and the contact time between the fuel and the air in the intake channel 4 is longer. This facilitates the efficient and thorough mixing of the fuel added in the fuel intake channel 4 with the air entering the rotary detonation combustion chamber 3, thereby improving the combustion efficiency in the rotary detonation combustion chamber 3.

[0050] Example 2.

[0051] Reference Figure 3 The difference between this embodiment and Embodiment 1 is that a guide block 12 is further provided between the inner cylinder 1 and the outer cylinder 2. The guide block 12 includes a first straight guide surface 121, an arc-shaped guide surface 122, and a second straight guide surface 123 connected end-to-end. The end of the second straight guide surface 123 away from the arc-shaped guide surface 122 is connected to one end of the first straight guide surface 121. A contraction channel 402 is located between the first straight guide surface 121 and the first connecting section 102. An arc-shaped guide channel 13 is provided between the guide block 12 and the inner cylinder 1. The first connecting section 102 is arc-shaped. The arc-shaped guide channel 13 is located within the area enclosed by the second straight guide surface 123, the arc-shaped guide surface 122, the first connecting section 102, and the second connecting section 103. A receiving cavity 6 is provided in the outer cylinder 2 to facilitate rapid and stable fuel injection based on the ejector channel 10.

[0052] Continue to refer to Figure 3 To further ensure the stability of the position of the guide block 12, a connecting post 14 is fixedly provided on the side of the first straight guide surface 121 and the side of the second straight guide surface 123 that are far away from each other. Multiple connecting posts 14 are evenly distributed around the axis of the guide block 12. The end of the connecting post 14 located on the first straight guide surface 121 that is far away from the first straight guide surface 121 is connected to the first connecting section 102. The end of the connecting post 14 located on the second straight guide surface 123 that is far away from the second straight guide surface 123 is connected to the fifth connecting section 203, so as to play a role in stabilizing and limiting the position of the guide block 12.

[0053] The implementation principle of Example 2 is as follows: The implementation principle of this application example 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 by setting the guide block 12, thereby realizing the unidirectional conduction effect during gas transportation. At the same time, the forward channel for air and fuel to enter the rotary detonation combustion chamber 3 is separated from the reverse channel for pressure return and combustion product return, effectively reducing the obstruction of pressure return and combustion product return on the forward-entering air and fuel, so that the detonation pressurization can compensate for the total pressure loss generated by the upper air intake, thereby improving the total pressure gain of the rotary detonation combustion chamber 3.

[0054] Example 3.

[0055] Reference Figure 4 The main difference between this embodiment and Embodiment 1 is that the ejector channel 10 is not provided, and a guide block 12 is provided between the inner cylinder 1 and the outer cylinder 2. The guide block 12 includes a first straight guide surface 121, an arc-shaped guide surface 122, and a second straight guide surface 123 connected end-to-end. The end of the second straight guide surface 123 away from the arc-shaped guide surface 122 is connected to one end of the first straight guide surface 121. A contraction channel 402 is located between the first straight guide surface 121 and the fourth connecting section 202. An arc-shaped guide channel 13 is provided between the guide block 12 and the inner cylinder 1. The fourth connecting section 202 is arc-shaped and located within the area enclosed by the second straight guide surface 123, the arc-shaped guide surface 122, the fourth connecting section 202, and the fifth connecting section 203. A receiving cavity 6 is provided in the inner cylinder 1 to facilitate rapid and stable fuel injection even without the ejector channel 10.

[0056] Continue to refer to Figure 4 To further ensure the stability of the position of the guide block 12, a connecting post 14 is fixedly provided on the side of the first straight guide surface 121 and the side of the second straight guide surface 123 that are far away from each other. Multiple connecting posts 14 are evenly distributed around the axis of the guide block 12. The end of the connecting post 14 located on the first straight guide surface 121 that is far away from the first straight guide surface 121 is connected to the first connecting section 102. The end of the connecting post 14 located on the second straight guide surface 123 that is far away from the second straight guide surface 123 is connected to the fifth connecting section 203, so as to play a role in stabilizing and limiting the position of the guide block 12.

[0057] The implementation principle of Embodiment 3 of this application is the same as that of Embodiment 1, and the additional technical effects are the same as those of Embodiment 2. The main difference from Embodiment 2 is that the location of the accommodating cavity 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. It has strong applicability.

[0058] Example 4.

[0059] Reference Figure 5 and Figure 6 The main difference between this embodiment and Embodiment 1 lies in the structure of the first injection structure. In this embodiment, the first injection structure further includes an injection rod 15, which includes a fixed rod body 151 and an adjusting rod body 152. The fixed rod body 151 has several fixed holes 16 evenly distributed around its own axis on its outer circumferential surface. The adjusting rod body 152 rotates coaxially and slides with the fixed rod body 151. The adjusting rod body 152 has an adjusting hole 17 corresponding to the fixed rod body 151 on its outer circumferential surface. When the adjusting hole 17 rotates to a position corresponding to one of the fixed holes 16, the adjusting hole 17 connects with one of the fixed holes 16, thus forming an injection hole 18 connected to the first air intake channel 401. This allows the fuel to have stronger penetration performance when injected into the first air intake channel 401, facilitating better initial mixing between the fuel and the introduced gas.

[0060] Reference Figure 6 To facilitate the quick adjustment of the adjusting hole 17 to the position where it connects with one of the fixed holes 16, and to ensure the stability of the position of the adjusting block after adjustment, a rotating plate 19 is rotatably mounted on the fixed rod. A fixing spring 20 is provided between the rotating plate 19 and the adjusting rod body 152. The fixing spring 20 is sleeved on the outside of the fixing rod body 151, and the fixing spring 20 is fixedly connected to the rotating plate 19 at one end and fixedly connected to the adjusting rod body 152 at the other end, so that the adjusting rod body 152 can move to the position where it connects with one of the fixed holes 16 under the elastic force of the fixing spring 20.

[0061] Continue to refer to Figure 6 The fixed rod 151 is provided with a plurality of positioning parts 21 evenly distributed around its own axis. The bottom of the adjusting rod 152 is provided with positioning holes 22 that correspond one-to-one with the positioning parts 21 and are respectively inserted into each positioning hole 22. When each positioning part 21 is inserted into each positioning hole 22, the adjusting rod 152 covers the fixed spring 20. The adjusting hole 17 is connected to one of the fixed holes 16. The cooperation between the positioning parts 21 and the positioning holes 22 plays a role in limiting the position of the adjusting rod 152 after rotation. The covering of the fixed spring 20 by the adjusting rod 152 facilitates the protection of the fixed spring 20 and ensures the performance of the fixed spring 20.

[0062] Reference Figure 5 and Figure 6 Multiple atomizing nozzles 7 and injection rods 15 are evenly arranged around the axis of the inner cylinder 1, and the atomizing nozzles 7 and injection rods 15 are staggered to ensure the penetration performance of fuel injected into the first inlet channel 401, and further ensure the uniformity of fuel injection into the first inlet channel 401.

[0063] The implementation principle of Embodiment 4 of this application is the same as that of Embodiment 1. On this basis, the setting of the injection rod 15 makes the fuel have stronger penetration performance when injected into the first air intake channel 401, which facilitates better initial mixing between the fuel and the introduced gas. At the same time, by pulling and rotating the adjusting rod 152 so that the adjusting hole 17 is aligned with different fixing holes 16, it is easy to adjust the fuel injection angle, which is convenient to adjust according to different injection conditions and has strong applicability.

[0064] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A rotary detonation combustion chamber staged fuel injection structure, characterized in that: The system includes a receiving cavity (6) disposed in the air intake device for containing fuel. The air intake device includes an inner cylinder (1) and an outer cylinder (2) coaxially fixedly disposed. The gap between the inner cylinder (1) and the outer cylinder (2) forms an air intake passage (4) that communicates with the rotary detonation combustion chamber (3). The air intake passage (4) includes a first air intake channel (401), a contraction channel (402), a second air intake channel (403), and an expansion channel that are sequentially connected along the air intake direction. The cross-sectional dimensions of the contraction channel (402) gradually decrease, and the cross-sectional dimensions of the expansion channel (404) gradually increase. The receiving cavity (6) is provided with a first injection structure, a second injection structure and a third injection structure in sequence along the air intake direction. The first injection structure is used to inject fuel into the first air intake channel (401), the second injection structure is used to inject fuel into the contraction channel (402), and the third injection structure is used to inject fuel into the second air intake channel (403).

2. The rotary detonation combustion chamber staged fuel injection structure according to claim 1, characterized in that: A flow guide block (12) is fixedly arranged between the inner cylinder (1) and the outer cylinder (2). The flow guide block (12) includes a first straight flow guide surface (121), an arc-shaped flow guide surface (122), and a second straight flow guide surface (123) connected end to end in sequence. The end of the second straight flow guide surface (123) away from the arc-shaped flow guide surface (122) is connected to one end of the first straight flow guide surface (121). The outer wall of the inner cylinder (1) is provided with an inner cylinder extension section (101), a first connecting section (102), a second connecting section (103), and a third connecting section (104) connected in sequence from the air intake direction. The inner wall of the outer cylinder (2) is provided with an outer cylinder extension section (201), a fourth connecting section (202), a fifth connecting section (203), and a sixth connecting section (204) connected in sequence from the air intake direction. The first air intake channel (401) is located between the inner cylinder extension section (101) and the outer cylinder extension section (201). The contraction channel (402) is located between the first straight guide surface (121) and the fourth connecting section (202). The second air intake channel (403) is located between the second connecting section (103) and the fifth connecting section (203). The expansion channel (404) is located between the third connecting section (104) and the sixth connecting section (204). The first connecting section (102) is arc-shaped. An arc-shaped guide channel (13) is provided between the guide block (12) and the inner cylinder (1). The arc-shaped guide channel (13) is located in the area enclosed 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 rotary detonation combustion chamber staged fuel injection structure according to claim 2, characterized in that: A connecting column (14) is fixedly provided on the side of the first straight guide surface (121) and the second straight guide surface (123) that are far apart. Multiple connecting columns (14) are distributed circumferentially 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 rotary detonation combustion chamber staged fuel injection structure according to claim 1, characterized in that: The first injection structure includes a first atomizing nozzle (7) connected to the first air intake channel (401), the second injection structure includes an oil injection hole (8) opened in the inner cylinder (1) or the outer cylinder (2) and connected to the contraction channel (402), and the third injection structure includes a second atomizing nozzle (9) connected to the second air intake channel (403).

5. The rotary detonation combustion chamber staged fuel injection structure according to claim 4, characterized in that: The first atomizing nozzle (7), the oil injection hole (8) and the second atomizing nozzle (9) are all circumferentially spaced around the axis of the inner cylinder (1).

6. The rotary detonation combustion chamber staged fuel injection structure according to claim 1, characterized in that: The first injection structure includes an injection rod (15), and the outer peripheral surface of the injection rod (15) is provided with an injection hole (18) that is connected to the first air intake channel (401).

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

8. A rotary detonation combustion chamber staged fuel injection structure according to claim 6, characterized in that: The injection rod (15) includes a fixed rod body (151) and an adjusting rod body (152). The fixed rod body (151) has several fixing holes (16) circumferentially distributed around its own axis on its outer peripheral surface. The adjusting rod body (152) rotates coaxially and slides with the fixed rod body (151). The adjusting rod body (152) has an adjusting hole (17). The fixed rod body (151) is provided with a positioning part (21) fixedly installed. The adjusting rod body (152) has an adjusting part (27). The positioning hole (22) is inserted and cooperates with the positioning part (21). There are multiple positioning holes (22) distributed circumferentially around the axis of the adjusting rod body (152). When the positioning part (21) is inserted and cooperates with one of the positioning holes (22), the adjusting hole (17) is connected to one of the fixing holes (16) to form a spray hole (18). The fixing rod body (151) is provided with a fixing spring (20) that makes the adjusting rod body (152) move toward the fixing rod body (151).

9. A rotary detonation combustion chamber staged fuel injection structure according to claim 8, characterized in that: The fixed rod (151) is coaxially mounted with a rotating plate (19), and 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 (152).

10. A rotary detonation combustion chamber staged fuel injection structure according to claim 1, characterized in that: A flow guide block (12) is fixedly arranged between the inner cylinder (1) and the outer cylinder (2). The flow guide block (12) includes a first straight flow guide surface (121), an arc-shaped flow guide surface (122), and a second straight flow guide surface (123) connected end to end in sequence. The end of the second straight flow guide surface (123) away from the arc-shaped flow guide surface (122) is connected to one end of the first straight flow guide surface (121). The outer wall of the inner cylinder (1) is provided with an inner cylinder extension section (101), a first connecting section (102), a second connecting section (103), and a third connecting section (104) connected in sequence from the air intake direction. The inner wall of the outer cylinder (2) is provided with an outer cylinder extension section (201), a fourth connecting section (202), a fifth connecting section (203), and a sixth connecting section (204) connected in sequence from the air intake direction. The first air intake channel (4) 01) Located between the inner cylinder extension section (101) and the outer cylinder extension section (201), the contraction channel (402) is located between the first straight guide surface (121) and the first connecting section (102), the second air intake channel (403) is located between the second connecting section (103) and the fifth connecting section (203), the expansion channel (404) is located between the third connecting section (104) and the sixth connecting section (204), the fourth connecting section (202) is arc-shaped, and an arc-shaped guide channel (13) is provided between the guide block (12) and the inner cylinder (1). The arc-shaped guide channel (13) is located in the area enclosed by the second straight guide surface (123), the arc-shaped guide surface (122), the fourth connecting section (202) and the fifth connecting section (203). The receiving cavity (6) is provided in the inner cylinder (1).

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