Supersonic flow enhanced mixing device and engine thereof

Abstract

The utility model belongs to the field of supersonic flow enhanced mixing, and particularly relates to a supersonic flow enhanced mixing device and an engine thereof, the supersonic flow enhanced mixing device comprises a slope and a transverse jet orifice which are sequentially arranged on the inner wall of a flow channel along the upstream and downstream directions; the upstream end face of the slope is rotationally connected with the inner wall of the flow channel, and the rotation driving mechanism is used for driving the slope to rotate along the upstream end face of the slope. When the transverse jet mixing effect is enough to meet the mixing enhancement requirement, the slope can be leveled by rotating the driving mechanism so as to reduce the total pressure loss, and meanwhile, the problem that large additional loss is generated in a non-working state, namely under the condition that a boundary layer is not separated, is solved; when the transverse jet mixing effect is not enough to meet the mixing requirement, the angle and height of the slope can be adaptively adjusted according to the working condition so as to assist in enhancing transverse jet mixing.

Description

Technical Field

[0001] The utility model belongs to the field of supersonic flow enhanced mixing, in particular to a supersonic flow enhanced mixing device and an engine thereof. Background Art

[0002] One of the technical challenges that needs to be addressed for the successful operation of scramjet engines is the efficient mixing of gases. Under typical flight conditions, the residence time of the airflow in the combustion chamber is only in milliseconds. It is difficult to achieve gas mixing under such high-speed conditions, so it is necessary to adopt a series of mixing enhancement devices to promote mixing.

[0003] Mixing enhancement technology can be divided into active enhanced mixing technology and passive enhanced mixing technology. Active mixing enhancement refers to injecting momentum and energy into the mixed flow field through mechanical, acoustic, electromagnetic and other means to disrupt the flow state and promote mixing. Active control technology has the advantage that the excitation position and parameters are easy to control, but it also has the disadvantage that it is difficult to introduce external excitation in engineering applications. Common excitation methods include jet excitation, mechanical vibration, plasma, acoustic wave excitation, etc. Passive enhanced mixing technology refers to the introduction of a disturbance device in the flow field to stimulate the three-dimensional instability characteristics of the flow and thus accelerate mixing. This method is simple and convenient, but the parameters are not adjustable and the adaptability to a wide range of working conditions is poor. The main methods include concave cavities, slopes, lobes, supports, backward steps, etc.

[0004] Among them, micro-slopes can effectively promote the enhancement of lateral jet mixing, but the current micro-slopes all adopt a fixed structure, which has the problems of unadjustable parameters and poor adaptability to a wide range of working conditions. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a supersonic flow enhancement mixing device with adjustable slope height and an engine thereof.

[0006] The utility model provides a supersonic flow enhancement mixing device, comprising slopes and transverse jet nozzles sequentially arranged along the upstream and downstream directions on the inner wall of the flow channel;

[0007] The upstream end surface of the ramp is rotatably connected to the inner wall of the flow channel, and further comprises a rotation driving mechanism for driving the ramp to rotate along its upstream end surface.

[0008] Furthermore, the rotation drive mechanism includes a lifting rod and a lifting drive mechanism provided in the inner wall of the flow channel, the lifting drive mechanism is used to drive the lifting rod to move up and down, and the slope connection end of the lifting rod is in sliding engagement with the slope;

[0009] The lifting rod is raised and lowered to drive the slope to rotate along its upstream end surface.

[0010] Furthermore, the lifting drive mechanism includes a rotation drive mechanism and a cam arranged on an output shaft of the rotation drive mechanism, which are connected to each other, and the driving connection end of the lifting rod abuts against the wheel surface of the cam.

[0011] Furthermore, a support plate is provided on the driving connection end of the lifting rod, and a roller that rotates with the wheel surface of the cam is provided on the end of the support plate away from the lifting rod.

[0012] Furthermore, the rotation drive mechanism further includes a guide rail parallel to the lifting direction of the lifting rod, and one end of the support plate is in sliding engagement with the guide rail.

[0013] Furthermore, the upstream end surface of the slope smoothly transitions to the inner wall of the flow channel.

[0014] Furthermore, the slope is a swept micro slope;

[0015] The sweeping angle of the swept micro-slope is 5° to 10°, the length is 5mm, and the width is 5mm;

[0016] The height of the sweeping micro-slope is within the boundary layer, and the height can be adjusted in the range of 0 to 3 mm.

[0017] Furthermore, the transverse jet nozzle is a circular nozzle;

[0018] The diameter of the transverse jet orifice is 0.5 mm to 2 mm, and the jet pressure ratio of the orifice is 5 to 30;

[0019] The distance between the transverse jet nozzle and the downstream end of the slope is 5 mm to 50 mm.

[0020] Furthermore, the present invention further comprises a control system connected to the rotation drive mechanism;

[0021] The control system controls the rotation drive mechanism to adjust the angle of the slope in real time by acquiring information from sensors in the combustion chamber.

[0022] The present invention also provides an engine comprising the above-mentioned supersonic flow enhancement mixing device.

[0023] The beneficial effect of the present invention is that when the lateral jet mixing effect is sufficient to meet the mixing enhancement requirements, the slope can be leveled by rotating the drive mechanism to reduce the total pressure loss, and at the same time solve the problem of large additional losses in the non-working state, that is, when the boundary layer is not separated; when the lateral jet mixing effect is not sufficient to meet the mixing requirements, the angle and height of the slope can be adaptively adjusted according to the working conditions to assist in lateral jet mixing enhancement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attachment Figure 1 It is a structural diagram of the utility model;

[0025] Attachment Figure 2 It is a forward schematic diagram of the present utility model;

[0026] Attachment Figure 3 It is a top view schematic diagram of the present utility model;

[0027] Attachment Figure 4 This is a schematic diagram of the structure of the slope in the utility model;

[0028] Attachment Figure 5 This is a schematic diagram of the flow field at the slope of the utility model;

[0029] Attachment Figure 6 This is a schematic diagram of the flow field at the transverse jet nozzle in the utility model.

[0030] In the figure, 1-slope; 2-transverse jet nozzle; 3-rotation drive mechanism; 31-lifting rod; 311-slope connection end; 312-drive connection end; 32-rotation drive mechanism; 33-cam; 34-support plate; 35-guide rail; 36-roller; 4-inner wall of flow channel; 5-oblique shock wave; 6-counter-rotating vortex pair; 7-large-scale streamwise vortex structure; 8-bow shock wave; 9-barrel shock wave; 10-separation shock wave; 11-incoming flow; 12-boundary layer; 13-transverse jet. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, the terms "first," "second," and so on, used in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0034] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection, electrical connection, physical connection, or wireless communication connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0035] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0036] As attached Figure 1 -Attached Figure 6 As shown, the present invention provides a supersonic flow enhancement mixing device, comprising a slope 1 and a transverse jet nozzle 2 sequentially arranged along the upstream and downstream directions on the inner wall 4 of the flow channel;

[0037] The upstream end face of the slope 1 is rotationally connected to the inner wall 4 of the flow channel, that is, a accommodating hole 41 is provided on the inner wall 4 of the flow channel, and the upstream end face of the slope 1 is rotationally connected to the upstream hole wall of the accommodating hole 41, and also includes a rotation drive mechanism 3 for driving the slope 1 to rotate along its upstream end face.

[0038] According to the present invention, when the mixing effect of the transverse jet 13 is sufficient to meet the mixing enhancement requirement, the slope 1 can be leveled by rotating the drive mechanism 3 to reduce the total pressure loss, and at the same time solve the problem of large additional losses in the non-working state, that is, when the boundary layer 12 is not separated; when the mixing effect of the transverse jet 13 is not sufficient to meet the mixing requirement, the angle and height of the slope 1 can be adaptively adjusted according to the working conditions to assist the mixing enhancement of the transverse jet 13.

[0039] In one preferred embodiment, the rotation drive mechanism 3 includes a lifting rod 31 and a lifting drive mechanism provided in the inner wall 4 of the flow channel. One side of the lifting rod 31 that cooperates with the slope 1 is a slope connecting end 311, and the other end is a slope connecting end 311. The lifting drive mechanism is used to drive the lifting rod 31 to lift and lower. The slope connecting end 311 of the lifting rod 31 slides with the slope 1. Specifically, the slope connecting end 311 of the lifting rod 31 can directly abut the slope 1, or a slide groove can be provided on the inner wall of the slope 1, so that the slope connecting end 311 of the lifting rod 31 can be slidably connected with the slide groove to achieve sliding cooperation.

[0040] The lifting rod 31 is raised and lowered to drive the slope 1 to rotate along its upstream end surface, thereby causing the downstream end surface of the slope 1 to rise and fall.

[0041] In one embodiment, the lifting drive mechanism includes a rotating drive mechanism 32 connected to each other and a cam 33 arranged on the output shaft of the rotating drive mechanism 32. The driving connection end 312 of the lifting rod 31 abuts against the wheel surface of the cam 33. In this embodiment, the lifting rod 31 is driven up and down by the rotation of the cam 33, which can simplify the structure of the driving method and ensure the stability of the structure.

[0042] In one embodiment, a support plate 34 is provided on the driving connection end 312 of the lifting rod 31, and a roller 36 that rotates with the wheel surface of the cam 33 is provided at the end of the support plate 34 facing away from the lifting rod 31. By cooperating with the cam 33, the friction coefficient can be reduced, and the service life and lifting control accuracy can be improved.

[0043] In one embodiment, the rotation drive mechanism 3 also includes a guide rail 35 parallel to the lifting direction of the lifting rod 31, and one end of the support plate 34 is slidably engaged with the guide rail 35. By setting the guide rail 35 and making the support plate 34 cooperate with the guide rail 35, the lifting and lowering of the lifting rod 31 can be guided, thereby improving its lifting stability.

[0044] In one embodiment, the upstream end face of the slope 1 smoothly transitions to the inner wall 4 of the flow channel to avoid pressure loss. Preferably, the upstream end face of the slope 1 and the inner wall 4 of the flow channel are connected by an integrated folding hinge. At this time, the upstream end face of the slope 1 smoothly transitions to the inner wall 4 of the flow channel.

[0045] In one embodiment, the slope 1 is a sweeping micro slope, referring to Figure 5The mixing efficiency of the swept slope is higher than that of the unswept slope. During operation, the incoming flow 11 generates an oblique shock wave 5 at the bottom of the slope 1. The oblique shock wave 5 forms a high-pressure area near the top surface of the slope 1. The high-pressure airflow there flows toward the low-pressure areas at the bottom of both sides of the slope 1, forming two vortices in opposite directions on both sides of the sweep of the slope 1. The two vortices develop along the edge of the slope 1 and converge into a counter-rotating vortex pair 6 at the downstream end of the slope 1. The counter-rotating vortex pair 6 is broken and merged to develop into a large-scale flow vortex structure 7, thereby promoting the mixing of the gas downstream of the slope.

[0046] In a specific embodiment, refer to the attached Figure 4 The sweep angle α of the swept micro slope is 5° to 10°, preferably the sweep angle α is 10°, the length is 5 mm, and the width H is 5 mm;

[0047] The height of the swept micro-slope is within the boundary layer 12. Preferably, the micro-slope refers to the slope 1 whose height is 1 / 10 to 1 / 2 of the thickness of the boundary layer 12, and the height of the swept micro-slope 1 can be adjusted in the range of 0 to 3 mm. The height adjustment range is achieved by driving the upstream end face of the slope 1 to rotate along the upstream wall of the accommodating hole 41 by the rotating drive mechanism 3. During the rotation process, the height of the downstream end of the slope 1 will be adjusted.

[0048] In one embodiment, the transverse jet nozzle 2 is a circular nozzle;

[0049] The diameter of the transverse jet nozzle 2 is 0.5 mm to 2 mm, preferably 1 mm, and the nozzle jet pressure ratio is 5 to 30, preferably 10;

[0050] Reference Attachment Figure 2 In order to ensure the full development of the wake flow vortex, the distance L between the transverse jet nozzle 2 and the downstream end of the slope 1 is 5mm to 50mm, and the preferred distance L is 20mm.

[0051] In one embodiment, it further includes a control system connected to the rotation drive mechanism 3;

[0052] The control system acquires information from sensors within the combustion chamber and controls the rotary drive mechanism 3 to adjust the angle of the ramp 1 in real time. This arrangement enables adaptive adjustment of the height H of the ramp 1, overcoming the shortcomings of the non-adjustable height of the ramp 1 and its poor adaptability to a wide range of operating conditions. This simultaneously reduces total pressure loss and enhances the mixing efficiency of the transverse jet 13.

[0053] The supersonic flow enhancement mixing device provided by the present invention has a ramp 1 and a transverse jet nozzle 2 arranged in sequence along the upstream and downstream directions. After the supersonic incoming flow 11 passes through the ramp 1, an oblique shock wave 5 is generated at the bottom of the ramp 1. The oblique shock wave 5 forms a high-pressure area near the top surface of the ramp 1. The high-pressure airflow there flows toward the low-pressure areas at the bottom of both sides of the ramp 1, forming two vortices in opposite directions on both sides of the ramp 1. The two vortices develop along the edge of the ramp 1 and converge into a counter-rotating vortex pair 6 at the downstream end of the ramp 1. The wake flow field of the ramp 1 can be divided into two regions: first, not far from the downstream end of the ramp 1, due to the strong KH instability, the counter-rotating vortex pair 6 is disturbed by the outer fluid and broken into small-scale vortices; second, downstream of the wake, the small-scale vortices merge to form an intermittent large-scale flow vortex structure 7.

[0054] Reference Attachment Figure 2 The transverse jet nozzle 2 ejects a transverse jet 13, the direction of which is perpendicular to the direction of the incoming flow 11. The transverse jet 13 interacts with the incoming flow 11, generating complex shock waves and large-scale turbulent structures in the flow field to enhance mixing. The flow field structure of the transverse jet 13 is shown in FIG. Figure 6 As shown, due to the obstruction of the incoming flow 11 by the transverse jet 13, a three-dimensional bow shock wave 8 is formed in the upstream region of the transverse jet 13. The high-pressure area behind the wave forms an adverse pressure gradient with the near-wall pressure distribution upstream of the transverse jet nozzle 2, causing the boundary layer of the incoming flow 11 to separate and inducing a separation shock wave 10 upstream of the jet. The airflow ejected from the transverse jet nozzle 2 undergoes Prandtl-Meyer expansion, which accelerates the expansion and interacts with the supersonic incoming flow 11, forming a barrel shock wave 9 and a Mach disk in the downstream region of the transverse jet 13. Downstream of the barrel shock wave 9, the transverse jet 13 interacts with the incoming flow 11, inducing a counter-rotating vortex pair 6, which dominates the downstream mixing process. Although the mixing effect of the transverse jet 13 is good.

[0055] In the present invention, the jet from the transverse jet orifice 2 enhances mixing. The large-scale directional vortex structure 7 generated by the ramp 1 strongly disturbs the transverse jet region, causing deformation of the bow shock wave 8 and barrel shock wave 9. This improves the penetration depth and mixing efficiency of the transverse jet 13. In other words, the present invention, through the adjustable ramp height, overcomes the shortcomings of existing systems, which lack adaptability over a wide operating range. This achieves a simultaneous reduction in total pressure loss and enhanced mixing efficiency of the transverse jet 13.

[0056] When the mixing effect of the transverse jet 13 is sufficient to meet the mixing enhancement requirements, the slope 1 can be leveled by rotating the drive mechanism 3 to reduce the total pressure loss; when the mixing effect of the transverse jet 13 is not sufficient to meet the mixing requirements, the angle and height of the slope 1 can be adaptively adjusted according to the working conditions to assist the mixing enhancement of the transverse jet 13.

[0057] The utility model also provides an engine, comprising the above-mentioned supersonic flow enhancement mixing device.

[0058] The above description is merely an embodiment and does not limit the present invention in any way. Any person skilled in the art can, without departing from the scope of the present invention, utilize the above-disclosed technical content to make many possible variations, modifications, or modifications to the present invention's technical solution into equivalent embodiments with equivalent variations. Therefore, any simple modifications, equivalent variations, and modifications to the above embodiments made in accordance with the technical essence of the present invention that do not depart from the content of the present invention's technical solution shall fall within the scope of protection of the present invention's technical solution.

Claims

1. A supersonic flow intensification mixing device, characterized in that: It comprises a slope (1) and a transverse jet nozzle (2) arranged in sequence along the upstream and downstream directions on the inner wall (4) of the flow channel; The upstream end face of the ramp (1) is rotatably connected to the inner wall (4) of the flow channel, and further comprises a rotation drive mechanism (3) for driving the ramp (1) to rotate along its upstream end face.

2. The supersonic flow intensification mixing device according to claim 1, wherein: The rotation drive mechanism (3) comprises a lifting rod (31) and a lifting drive mechanism arranged in the inner wall (4) of the flow channel, wherein the lifting drive mechanism is used to drive the lifting rod (31) to move up and down, and the slope connection end (311) of the lifting rod (31) is in sliding engagement with the slope (1); The lifting rod (31) is raised and lowered, driving the slope (1) to rotate along its upstream end surface.

3. The supersonic flow intensification mixing device according to claim 2, wherein: The lifting drive mechanism comprises a mutually connected rotation drive mechanism (32) and a cam (33) arranged on the output shaft of the rotation drive mechanism (32); the driving connection end (312) of the lifting rod (31) abuts against the wheel surface of the cam (33).

4. The supersonic flow intensification mixing device according to claim 3, wherein: A support plate (34) is provided on the driving connection end (312) of the lifting rod (31), and a roller (36) rotatably matched with the wheel surface of the cam (33) is provided on one end of the support plate (34) away from the lifting rod (31).

5. The supersonic flow intensification mixing device according to claim 4, wherein: The rotation drive mechanism (3) further comprises a guide rail (35) parallel to the lifting direction of the lifting rod (31), and one end of the support plate (34) is in sliding engagement with the guide rail (35).

6. The supersonic flow intensification mixing device according to claim 1, wherein: The upstream end surface of the slope (1) smoothly transitions to the inner wall (4) of the flow channel.

7. The supersonic flow intensification mixing device according to any one of claims 1 to 6, characterized in that: The slope (1) is a swept micro slope; The sweeping angle of the swept micro-slope is 5° to 10°, the length is 5mm, and the width is 5mm; The height of the sweeping micro-slope is within the boundary layer (12), and the height can be adjusted within a range of 0 to 3 mm.

8. The supersonic flow intensification mixing device according to claim 7, wherein: The transverse jet nozzle (2) is a circular nozzle; The diameter of the transverse jet nozzle (2) is 0.5 mm to 2 mm, and the nozzle jet pressure ratio is 5 to 30; The distance between the transverse jet nozzle (2) and the downstream end of the slope (1) is 5 mm to 50 mm.

9. The supersonic flow intensification mixing device according to any one of claims 1 to 6, characterized in that: Also includes a control system connected to the rotation drive mechanism (3); The control system controls the rotation drive mechanism (3) to adjust the angle of the slope (1) in real time by acquiring sensor information in the combustion chamber.

10. An engine, characterized in that: The invention comprises the supersonic flow intensification mixing device according to any one of claims 1 to 9.

Images