Flow control method and device for flow channel in engine

Abstract

The invention relates to a flow control method and device for a flow channel in an engine. The method comprises the steps that a control panel is arranged at an air inlet channel of an engine, and the flowing mode in a flow channel is regulated and controlled through the control panel; when the control panel is perpendicular to the incoming air flow, the air inlet channel is in a closed state so as to block high-temperature product reverse flow and back pressure forward transmission generated by combustion heat release, and it is guaranteed that a pressure wave system is subjected to regular reflection at the closed end. When the control plate rotates along the rotating shaft in a reciprocating manner, an equivalent Laval nozzle structure is formed, and a high-turbulence flow field for enhancing the reactant mixing degree is formed; when the control panel is parallel to the incoming air flow, the air inlet resistance is small, and therefore low-resistance and rapid air inlet is achieved. According to the invention, the control panel actively controls the flowing mode of the flow channel in the engine, so that low-resistance rapid air intake can be realized, the reactant mixing degree can be enhanced, and countercurrent and back pressure forward transmission of combustion products are efficiently blocked, thereby improving the thrust performance of the supercharged combustion engine.

Description

Technical Field

[0001] The present invention relates to the technical field of engine flow control, and in particular to a flow control method and device for an engine inner flow channel. Background Art

[0002] As the core power source for starting various equipment, the performance of the engine is directly related to the operating efficiency and performance of various equipment. By effectively controlling the internal flow channel of the engine, the performance of the engine can be effectively improved.

[0003] However, in the traditional inner flow channel design, high-temperature and high-pressure products are prone to reverse flow and forward transmission during combustion, which causes some products to remain in the inner flow channel for a long time and require multiple cycles of reciprocating motion to be discharged. This will lead to low exhaust efficiency of the engine, causing a large loss of engine thrust and affecting the overall performance of the engine.

[0004] In addition, the traditional inner flow channel also has certain obstacles in terms of air intake. For example, the traditional mechanical valve control, due to its own high blockage, greatly increases the intake resistance, making it difficult for fresh air to enter the inner flow channel in sufficient quantity and smoothly, and cannot meet the intake demand for efficient operation of the engine, limiting the potential of the engine. Summary of the invention

[0005] Based on this, it is necessary to provide a flow control method and device for the flow channel inside the engine that can solve the problem of reverse flow forward transmission, achieve low-resistance and rapid air intake, and enhance the degree of mixing of reactants in response to the above-mentioned technical problems.

[0006] A flow control method for a flow passage in an engine, the method comprising: providing a control panel at an engine air intake, and regulating the flow pattern in the flow passage by means of the control panel; When the control plate is perpendicular to the incoming air flow, the air inlet is in a closed state to block the backflow and forward transmission of the high-temperature products generated by the combustion heat release, and to ensure the positive reflection of the pressure wave system at the closed end; When the control plate reciprocates and rotates along the rotating shaft, an equivalent Laval nozzle configuration is formed, and a high turbulence flow field is formed to enhance the mixing degree of reactants; When the control plate is parallel to the incoming air flow, the air intake resistance is small, thereby achieving low-resistance and fast air intake.

[0007] A flow control device for an internal flow channel of an engine comprises: a control plate arranged at the entrance of an air intake channel, one end of the control plate being fixed to the inner wall surface of the air intake channel via a rotating shaft, and the other end being a rotating end; the rotating end has a stroke of reciprocating rotational motion centered on the rotating shaft.

[0008] The flow control method and device of the flow channel in the above-mentioned engine are provided with a control plate at the engine air inlet, and the flow mode in the flow channel is regulated by the control plate; when the control plate is perpendicular to the air flow, the air inlet is in a closed state to block the backflow and back pressure forward transmission of high-temperature products generated by combustion heat release, and ensure the positive reflection of the pressure wave system at the closed end; when the control plate reciprocates along the rotating shaft, an equivalent Laval nozzle configuration is formed, and a strong turbulence flow field that enhances the mixing degree of reactants is formed; when the control plate is parallel to the air flow, the intake resistance is small, thereby achieving low-resistance and fast intake. The present invention can achieve low-resistance and fast intake, enhance the mixing degree of reactants, and efficiently block the backflow and back pressure forward transmission of combustion products through the active control of the flow mode of the flow channel in the engine by the control plate, thereby improving the thrust performance of the supercharged combustion engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0010] Figure 1 A schematic flow chart of a flow control method for a flow passage in an engine according to an embodiment; Figure 2 A schematic diagram of the working principle of a flow control method in a flow channel in an engine in one embodiment; Figure 3 A schematic diagram of a supercharged combustion process with a transient supercharging ratio of up to 5.8 under a stationary gas flow in one embodiment; Figure 4 This is a schematic diagram of a supercharged combustion process with a transient boost ratio of up to 4.2 at Ma0.8 in an embodiment.

[0011] Description of reference numerals: Air inflow 1, flow channel in the engine 2, upper wall 21, lower wall 22, control panel 3, rotating shaft 4, throat 5, local supersonic flow field area 6, subsonic flow field area 7, unsteady flow field 8, normal shock wave 9, fuel injection area 10.

[0012] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0013] 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 described embodiments 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 creative work are within the scope of protection of the present invention.

[0014] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0015] It can be understood that 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 the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0016] The following will describe the implementation of the present invention in detail with reference to the accompanying drawings in the embodiment diagram of the present invention.

[0017] Example 1 The present embodiment discloses a flow control method for an engine internal flow channel, which can realize low-resistance and rapid air intake, enhance the degree of mixing of reactants, and effectively block the backflow and forward transmission of combustion products, thereby improving the thrust performance of a supercharged combustion engine, through active control of a control plate.

[0018] like Figure 1 and Figure 2 As shown, the flow control method of the flow channel in the engine provided by this embodiment includes the following steps: Step 201, a control panel is provided at the engine air intake, and the flow pattern in the flow channel is regulated by the control panel.

[0019] Specifically, see Figure 2 The upper wall surface 21 and the lower wall surface 22 form a simple engine inner flow channel 2, and a control board 3 is arranged at the inlet of the air inlet. The control board 3 has a stroke of reciprocating rotation around the rotating shaft 4, and the flow mode in the flow channel is regulated by such a reciprocating rotation stroke.

[0020] Step 202, when the control plate 3 is perpendicular to the incoming air flow, the air inlet is in a closed state to block the backflow and forward transmission of the high-temperature products generated by the combustion heat release, and to ensure the positive reflection of the pressure wave system at the closed end.

[0021] It can be understood that when the control plate 3 is perpendicular to the incoming air flow, the included angle between the control plate 3 and the cross section of the air inlet is 0°, that is, the control plate is completely closed. As a rigid thrust wall, it can ensure that the air inlet is in a closed state, thereby effectively blocking the backflow and forward transmission of high-temperature products generated by combustion heat release, and ensuring the positive reflection of the pressure wave system at the closed end, thereby maximizing the thrust performance.

[0022] Step 203, when the control plate 3 reciprocates along the rotating shaft, an equivalent Laval nozzle configuration is formed, and a high turbulence flow field is formed to enhance the mixing degree of the reactants.

[0023] It can be understood that the reactant usually refers to a mixture of air and fuel, and the types of fuel usually include gas fuel and liquid fuel.

[0024] When the control plate 3 rotates back and forth along the rotating shaft, a process similar to the reciprocating fan movement is formed. During the fanning process, an equivalent Laval nozzle configuration can be formed between the rotating end of the control plate 3 and the upper wall 21, thereby forming a throat 5 and improving the flow field structure downstream in the flow channel 2 in the engine, thereby enhancing the mixing effect of the reactants.

[0025] Step 204, when the control plate 3 is parallel to the air flow 1, the air intake resistance is small, thereby achieving low-resistance and fast air intake.

[0026] It can be understood that the control plate 3 rotates along the axis toward the combustion chamber, and when it is completely parallel to the air flow 1, a 90° angle is formed. In this state, the control plate 3 is fully opened, and the air flow in the flow channel 2 in the engine is unobstructed, with minimal intake resistance, so that sufficient fresh air can be refilled quickly with low resistance to enhance the combustion effect.

[0027] In one of the embodiments, when the control board 3 reciprocates along the rotating shaft 4, the angle when the control board 3 is perpendicular to the air flow 1 is regarded as 0°, and the angle when the control board 3 is parallel to the air flow 1 is regarded as 90°, then the reciprocating rotation of the control board 3 along 0°~90° is one cycle.

[0028] It can be understood that in this embodiment, the rotation range of the control plate 3 is 0°~90°, and the fanning direction is preferably toward the fuel injection area 10. By limiting the rotation range, it is possible to effectively avoid excessive movement of the control plate 3, which may cause the air flow to be too large or too small and exceed the reasonable range; at the same time, the control of the rotation direction can make the incoming air flow to the downstream better, ensuring that the fuel is in contact with enough air at the first time, and this periodic reciprocating fanning can make the mixing process of air and fuel in the combustion chamber faster and more effective, thereby achieving a better mixing effect.

[0029] Specifically, the control plate 3 has a critical angle within one cycle of rotation along the rotating shaft 4; when the air flow 1 is a subsonic flow, the control plate 3 rotates to between 0° and the critical angle, the subsonic flow is accelerated through the equivalent Laval nozzle configuration to form a sonic throat, and a local supersonic flow field area 6 and a subsonic flow field area 7 are formed behind the control plate 3; when the control plate 3 rotates to between the critical angle and 90°, the subsonic flow maintains subsonic speed at the throat 5, and a subsonic flow field area 7 is formed behind the throat. Different areas in the flow field have different velocity distributions, and a large number of vortices are generated, thereby enhancing the degree of mixing of reactants.

[0030] It is worth noting that in this embodiment, a certain critical value reached by the control plate 3 is taken as the critical angle, and the concept of the critical angle is used to describe the change of the flow field in the engine within a rotation cycle of the control plate 3. In other words, the critical angle represents a critical angle at which the velocity at the throat 5 decreases from the speed of sound to the subsonic speed, and it is not specified as a specific angle value.

[0031] It can be understood that when the control plate 3 is flapping, the angle increases from 0° to 90°, and the throat 5 gradually widens. When the control plate 3 increases from 0° to a certain critical value, a local supersonic flow field area 6 and a subsonic flow field area 7 are formed behind the control plate 3; when the control plate 3 increases from a certain critical value to 90°, the subsonic incoming flow maintains subsonic speed at the throat 5, and a subsonic flow field area 7 is formed behind the throat. On the contrary, when the angle decreases from 90° to 0°, the throat 5 gradually narrows. When it decreases from 90° to a certain critical value, the subsonic incoming flow maintains subsonic speed at the throat 5, and a subsonic flow field area 7 is formed behind the throat; when it decreases from a certain critical value to 0°, a local supersonic flow field area 6 and a subsonic flow field area 7 are formed behind the control plate 3.

[0032] In addition, when the incoming air flow 1 is a supersonic flow, the supersonic flow is decelerated through the equivalent Laval nozzle configuration to form a sonic throat, and a local supersonic flow field region 6 and a subsonic flow field region 7 are formed behind the control plate 3 .

[0033] In one embodiment, when the control plate 3 reciprocates along the rotating shaft 4, the rotating end of the control plate 3 induces an unsteady flow field 8 and forms an unsteady high turbulence flow field near the fuel injection area 10, thereby enhancing the mixing degree of the reactants.

[0034] In one of the embodiments, when the control plate 3 reciprocates along the rotating shaft 4, a positive shock wave 9 is generated downstream of the flow channel 2 in the engine; the positive shock wave 9 meets the fuel injected by the fuel injection area 10, further enhancing the mixing of the reactants to form an explosive combustion gas that is close to premixed.

[0035] It can be understood that the reciprocating rotation of the control plate 3 is a reciprocating periodic fanning process. In the reciprocating fanning process, the angle of the rotating end of the control plate 3 first increases from 0° to 90°, which is the first half cycle; then it rotates back from 90° to 0°, forming the second half cycle; repeating this cycle process, forming a reciprocating periodic fanning.

[0036] Through this reciprocating periodic flapping, on the one hand, it is possible to induce an unsteady flow field 8, which includes periodic vortex generation, shedding and fragmentation evolution processes. In this way, an unsteady strong turbulence flow field is formed near the fuel injection area 10, and the mixing enhancement of the reactants is initially achieved. On the other hand, this reciprocating periodic flapping will also generate an unstable positive shock wave 9 in the flow channel 2 of the engine, which is pushed downstream at any time; when the positive shock wave 9 meets the fuel injected by the fuel injection area 10, it can further enhance the mixing effect of the reactants, forming a nearly premixed explosive gas, and providing a nearly premixed explosive gas condition for achieving a thrust performance of high specific impulse output after ignition.

[0037] In one embodiment, the flow control method of the flow channel in the engine proposed by the present invention is verified. An arbitrary engine device is used, whose inlet cross-sectional size is 50mm×50mm, the outlet cross-sectional size is Φ40mm, and the total length is 800mm. The test results are as follows Figure 3 and Figure 4 As shown, through ignition tests under different incoming flow Mach numbers, equipped with the method proposed by the present invention, a supercharged combustion process with a large transient supercharging ratio was achieved.

[0038] The flow control method for the flow channel in the engine provided in this embodiment can realize a periodic combustion mode of high-frequency self-sustaining and high specific impulse output of a supercharged combustion engine. It can realize low-resistance and fast air intake in a simple flow channel 2 in the engine at a low Mach number (Ma0~Ma3.0), and can also enhance the mixing degree of reactants, and efficiently block the backflow and back pressure forward transmission of combustion products, effectively improve the thrust performance of the engine, and has a wide range of applications.

[0039] Although this embodiment Figure 1The steps in the process are shown in sequence as indicated by the arrows, but the steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of the steps, and the steps can be executed in other orders. Figure 1 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0040] Example 2 Based on the flow control method of the engine internal flow channel in Example 1, this embodiment discloses a flow control device of the engine internal flow channel, which includes a control plate 3 arranged at the entrance of the intake duct, one end of the control plate 3 is fixed in the engine internal flow channel 2 through a rotating shaft 4, located on the inner wall surface at the entrance of the intake duct, and the other end is a rotating end; the rotating end has a stroke of reciprocating rotation motion centered on the rotating shaft 4 to regulate the flow pattern in the engine internal flow channel 2.

[0041] Specifically, the rotating end of the control panel 3 reciprocates 0° to 90° once as one cycle, and performs periodic reciprocating rotational motion. A driving member is also provided, and the rotating shaft 4 is mechanically fixed to the driving member. The movement of the rotating shaft is controlled by the driving member, thereby driving the control panel 4 to perform reciprocating rotational motion around the rotating shaft 4 as the center. In addition, the shape of the control panel 3 is adapted to the cross-sectional shape at the entrance of the air intake duct. When the control panel 3 is installed at the entrance of the air intake duct, it has a clearance fit with the wall surface of the flow channel in the engine. When the control panel 3 is arranged vertically, the air intake duct can be closed. Preferably, the driving member can be a motor or an electric motor; the control panel 3 can adopt a flat valve sheet structure.

[0042] It can be seen that the device provided in this embodiment has a simple structure and is easy to use. The movement of the control board 3 can be easily driven by a motor or a motor. There is no need for a complex driving device and a high-precision synchronous control system to adjust the rotation speed, which reduces the complexity and cost of the entire system. It has high economic value and broad application prospects.

[0043] In this embodiment, the specific working process and working principle of the flow control device of the flow channel in the engine are the same as those in the method in Embodiment 1, so they are not described in detail in this embodiment. Each unit module can be implemented in whole or in part by software, hardware, or a combination thereof, and each unit module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each of the above unit modules.

[0044] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A flow control method for a flow channel in an engine, characterized in that: The method comprises: providing a control panel at an engine air intake passage, and regulating the flow pattern in the flow passage by means of the control panel; When the control plate is perpendicular to the incoming air flow, the air inlet is in a closed state to block the backflow and forward transmission of the high-temperature products generated by the combustion heat release, and to ensure the positive reflection of the pressure wave system at the closed end; When the control plate reciprocates and rotates along the rotating shaft, an equivalent Laval nozzle configuration is formed, and a high turbulence flow field is formed to enhance the mixing degree of reactants; When the control plate is parallel to the incoming air flow, the air intake resistance is small, thereby achieving low-resistance and fast air intake.

2. The flow control method of the flow passage in the engine according to claim 1, characterized in that: When the control plate reciprocates along the rotating shaft, the angle when the control plate is perpendicular to the air flow is regarded as 0°, and the angle when the control plate is parallel to the air flow is regarded as 90°. Then, one reciprocating rotation of the control plate along 0°~90° is one cycle.

3. The flow control method of the flow passage in the engine according to claim 2, characterized in that: The control plate has a critical angle within one rotation cycle along the rotation axis; When the incoming air flow is subsonic and the control plate rotates to between 0° and the critical angle, the subsonic incoming flow is accelerated through the equivalent Laval nozzle configuration to form a sonic throat, and a local supersonic flow field area and a subsonic flow field area are formed behind the control plate. When the control plate rotates to between the critical angle and 90°, the subsonic incoming flow remains subsonic at the throat, and a subsonic flow field area is formed after the throat.

4. The flow control method of the flow passage in the engine according to claim 2, characterized in that: When the incoming air flow is a supersonic flow, the supersonic flow is decelerated through the equivalent Laval nozzle configuration to form a sonic throat, and a local supersonic flow field area and a subsonic flow field area are formed behind the control plate.

5. The flow control method of the flow passage in the engine according to claim 2, characterized in that: When the control plate reciprocates along the rotating shaft, the rotating end of the control plate induces an unsteady flow field and forms an unsteady strong turbulence flow field near the fuel injection area, thereby enhancing the mixing of reactants.

6. The flow control method of the flow passage in the engine according to claim 5, characterized in that: When the control plate reciprocates and rotates along the rotating shaft, a normal shock wave is generated downstream of the flow channel in the engine; The positive shock wave meets the fuel in the fuel injection area, further enhancing the mixing of the reactants to form nearly premixed explosive combustion gas.

7. A flow control device for a flow channel in an engine, characterized in that: include: A control plate is arranged at the inlet of the air inlet, one end of the control plate is fixed to the inner wall surface of the air inlet through a rotating shaft, and the other end is a rotating end; the rotating end has a stroke of reciprocating rotational motion centered on the rotating shaft.

8. The flow control device for the flow passage in the engine according to claim 7, characterized in that: The rotating end of the control plate performs periodic reciprocating rotational motion, with one reciprocating rotation from 0° to 90° constituting one cycle.

9. The flow control device for the flow passage in the engine according to claim 8, characterized in that: The rotating shaft is driven to rotate by a driving member, thereby driving the control plate to reciprocate and rotate.

10. The flow control device for an engine inner flow passage according to any one of claims 7 to 9, characterized in that: The shape of the control plate is matched with the cross-sectional shape at the inlet of the air inlet, so that when the control plate is arranged vertically, the air inlet can be in a closed state.

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