A variable geometry diffuser adjustable device

Abstract

The application belongs to the technical field of aero-engines, and particularly relates to a variable-geometry diffuser adjustable device, which comprises a diffuser, a casing, a flame tube, an adjustable structure fixing disc, an adjustable structure rotating disc and a driving mechanism. The casing forms an annular space for mounting the flame tube. The diffuser is mounted at the front end of the casing to pass air into the annular space. The adjustable structure fixing disc and the adjustable structure rotating disc are mounted between the diffuser and the flame tube to adjust the air flow between the diffuser and the flame tube. The adjustable structure fixing disc is fixed on the casing. The adjustable structure fixing disc is provided with circumferentially distributed first air inlet holes. The adjustable structure rotating disc is rotatably and concentrically mounted on the end face of the adjustable structure fixing disc. The driving mechanism drives the adjustable structure rotating disc to rotate relative to the adjustable structure fixing disc. The adjustable structure rotating disc is provided with second air inlet holes. The angle between the adjustable structure fixing disc and the adjustable structure rotating disc is changed, and then the communication area of the first air inlet holes and the second air inlet holes is changed.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aero-engines, and particularly relates to a variable-geometry diffuser adjustable device. BACKGROUND

[0002] With the increase of the combustion chamber temperature rise level, the oil-gas ratio of the combustion chamber is gradually increased, and more air needs to be involved in combustion. Most of the combustion air enters from the head of the flame tube, which causes the head intake to be greatly increased. Increasing the air flow in the head main combustion area will cause difficulties in ignition and flame stability of the combustion chamber in the initial working state, and will make the lean blowout boundary worse, affecting the combustion performance in the small state. In order to simultaneously consider the combustion performance in the large state and the lean blowout and combustion performance in the slow vehicle state, the present high-temperature-rise combustion chamber adopts a zoned and staged combustion combustion organization technology to solve this problem. Under the condition that the head intake of the combustion chamber is constant, two combustion zones, a pre-combustion zone and a main combustion zone, are set. The pre-combustion zone is inside, and the main combustion zone is outside. In the small state, only the pre-combustion zone works, to ensure the lean blowout and combustion performance in the slow vehicle state. In the large state, the main combustion zone and the pre-combustion zone work simultaneously, to ensure the comprehensive performance in the large state. The development of the zoned and staged combustion combustion organization technology is needed to meet the design requirements of the high-temperature-rise combustion chamber. If the design requirements of a higher temperature rise can be met without changing the combustion organization mode, the technical difficulty and cost can be effectively reduced. The existing zoned and staged combustion organization mode has a fixed head intake, which achieves zoned and staged combustion through a multi-stage swirler and a fuel nozzle. The multi-stage swirler and the staged fuel nozzle need to be redesigned, which increases the complexity of the head structure. In addition, the zoned and staged combustion needs a certain overlap area between the main combustion air flow and the pre-combustion air flow to realize the role of the pre-combustion zone igniting the main combustion zone in the large state. If the overlap area of the combustion zones is too small, stratification of the flame is prone to occur in the large state. If the overlap area of the two combustion zones is too large, the slow vehicle blowout performance is poor, and oscillating combustion is prone to occur in the lean state. Therefore, the zoned and staged combustion technology has a large technical difficulty and high cost. SUMMARY

[0003] In order to solve the above problems, the application provides a variable-geometry diffuser adjustable device, which comprises:

[0004] a diffuser, a casing, a flame tube, an adjustable structure fixed disc, an adjustable structure rotating disc, and a driving mechanism.

[0005] The casing forms an annular space for mounting the flame tube. The diffuser is mounted at the front end of the casing to pass air into the annular space. The adjustable structure fixed disc and the adjustable structure rotating disc are mounted between the diffuser and the flame tube, and are used to adjust the air flow between the diffuser and the flame tube.

[0006] The adjustable structure fixed disc is fixed on the machine case, the adjustable structure fixed disc has the first air inlet hole which is distributed in the circumference, the adjustable structure rotating disc is installed on the end face of the adjustable structure fixed disc in the concentric rotation, the driving mechanism drives the adjustable structure rotating disc to rotate relative to the adjustable structure fixed disc, the adjustable structure rotating disc has the second air inlet hole, the angle of the adjustable structure fixed disc relative to the adjustable structure rotating disc is changed, and then the communication area of the first air inlet hole and the second air inlet hole is changed.

[0007] Preferably, the driving mechanism comprises a transmission gear, a rotary motion connecting rod and a linear driving mechanism.

[0008] The transmission gear has a gear disc and a fixed shaft located in the center of the gear disc, the fixed shaft is rotatably installed in the mounting hole in the wall surface of the machine case, and the gear teeth on the gear disc are engaged with the gear rack on the disc surface of the adjustable structure rotating disc.

[0009] One end of the rotary motion connecting rod is fixedly connected with the fixed shaft of the transmission gear, and the other end is hingedly connected with the linear driving mechanism fixed on the outside of the machine case, so that linear motion is converted into circumferential motion.

[0010] Preferably, the transmission gear and the motor; the transmission gear has a gear disc and a fixed shaft located in the center of the gear disc, the fixed shaft is rotatably installed in the mounting hole in the wall surface of the machine case, and the gear teeth on the gear disc are engaged with the gear rack on the disc surface of the adjustable structure rotating disc; the motor drives the fixed shaft to rotate.

[0011] Preferably, the mounting mode of the adjustable structure fixed disc and the adjustable structure rotating disc comprises:

[0012] The edge of the adjustable structure fixed disc has a plurality of fan-shaped ring grooves, and the adjustable structure rotating disc has a plurality of fan-shaped bosses which are assembled into the fan-shaped ring grooves at a preset angle.

[0013] Preferably, the adjustable structure fixed disc has a first outer ring cavity air inlet groove and a first inner ring cavity air inlet groove, and the first air inlet hole is located between the first outer ring cavity air inlet groove and the first inner ring cavity air inlet groove.

[0014] The disc surface of the adjustable structure rotating disc has a second outer ring cavity air inlet groove and a second inner ring cavity air inlet groove, and the second air inlet hole is located between the second outer ring cavity air inlet groove and the second inner ring cavity air inlet groove.

[0015] Preferably, the adjustable structure fixed disc and the adjustable structure rotating disc have a circular air hole corresponding to the axial position of the flame tube at the center position.

[0016] Preferably, the first air inlet hole and the second air inlet hole each comprise a plurality of circumferentially distributed discrete holes, and the circumferential spacing between adjacent discrete holes is at least greater than the circumferential length of one discrete hole.

[0017] The fixed shaft has an axial limiting boss and a connecting force transmission boss, the edge of the housing mounting hole forms a guide cylinder, the fixed shaft is sleeved in the guide cylinder, the axial limiting boss is in contact with the edge wall of the mounting hole for limiting, the connecting force transmission boss is connected with the rotary motion connecting rod for torque transmission, and the rotary motion connecting rod is fixed through the compression nut

[0018] Advantages of the present application include:

[0019] 1. Adjusting the adjusting mechanism to re-distribute the airflow in the diffuser bump area, increase the airflow in the head, and solve the problem of needing more head airflow to organize combustion in the high-temperature combustion chamber.

[0020] 2. In slow vehicle small state, adjust the adjusting mechanism to close the air inlet hole opposite to the head, reduce the head air intake, and meet the lean-out and combustion performance requirements of the slow vehicle.

[0021] The present patent reduces the difficulty of designing the head swirl generator and nozzle, provides a simple adjustable mechanism, and has strong engineering realizability. The adjustable structure has passed test verification and is effective. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic diagram of the variable geometry diffuser adjustable device;

[0023] Figure 2 is a schematic diagram of the transmission gear;

[0024] Figure 3 is the A sectional view of Figure 2 ;

[0025] Figure 4 is a schematic diagram of the adjustable structure fixed disc;

[0026] Figure 5 is a schematic diagram of the adjustable structure rotating disc;

[0027] Figure 6 is a sectional view of the rotary motion connecting rod.

[0028] Figure 7 is a schematic diagram of the rotary motion connecting rod. DETAILED DESCRIPTION

[0029] To make the technical solutions of the present application and their advantages clearer, the technical solutions of the present application will be further clearly and completely described below in combination with the drawings. It should be understood that the specific embodiments described herein are only part of the embodiments of the present application, and are only used to explain the present application, but not to limit the present application. It should be noted that, for the purpose of description, only parts related to the present application are shown in the drawings, and other related parts can be referred to the usual design. In the case of no conflict, the embodiments in the present application and the technical features in the embodiments can be combined to obtain new embodiments.

[0030] As Figures 1-7 shown in the figure, in order to solve the above problems, the application provides a variable geometry diffuser adjustable device, comprising:

[0031] 1 diffuser, 2 casing, 3 flame tube, 4 adjustable structure fixed disc, 5 adjustable structure rotating disc, 6 transmission gear, 7 sealing washer, 8 compression nut, 9 rotary motion connecting rod, 10 drive mechanism, 11 fixed support, 12, fixed cover plate, drive mechanism;

[0032] Among them, the casing 2 forms an annular space for installing the flame tube 3, the front end of the casing 2 is installed with the diffuser 1 for passing air into the annular space, the adjustable structure fixed disc 4 and the adjustable structure rotating disc 5 are installed between the diffuser 1 and the flame tube 3, used for adjusting the air flow between the diffuser 1 and the flame tube 3;

[0033] The adjustable structure fixed disc 4 is fixed on the casing 2, the adjustable structure fixed disc 4 has a circumferentially distributed first air inlet hole, the adjustable structure rotating disc 5 is rotatably and concentrically installed on the end face of the adjustable structure fixed disc 4, the drive mechanism drives the adjustable structure rotating disc 5 to rotate relative to the adjustable structure fixed disc 4, the adjustable structure rotating disc 5 has a second air inlet hole, and the angle of the adjustable structure fixed disc 4 relative to the adjustable structure rotating disc 5 is changed, and then the communication area of the first air inlet hole and the second air inlet hole is changed.

[0034] Preferably, the drive mechanism comprises: a transmission gear 6, a rotary motion connecting rod 9, and a linear drive mechanism 10;

[0035] The transmission gear 6 has a gear disc and a fixed shaft located at the center of the gear disc, the fixed shaft is rotatably installed in the mounting hole of the wall surface of the casing 2, and the gear teeth on the gear disc are engaged with the gear rack 20 on the disc surface of the adjustable structure rotating disc 5;

[0036] One end of the rotary motion connecting rod 9 is fixedly connected with the fixed shaft of the transmission gear 6, and the other end is hingedly connected with the linear drive mechanism 10 fixed on the outside of the casing 2, so as to convert linear motion into circular motion.

[0037] Preferably, the transmission gear 6 and the motor; the transmission gear 6 has a gear disc and a fixed shaft located at the center of the gear disc, the fixed shaft is rotatably installed in the mounting hole of the wall surface of the casing 2, and the gear teeth on the gear disc are engaged with the gear rack on the disc surface of the adjustable structure rotating disc 5; the motor drives the fixed shaft to rotate.

[0038] Preferably, the mounting mode of the adjustable structure fixed disc 4 and the adjustable structure rotating disc 5 comprises:

[0039] The edge of the adjustable structure fixed disc (4) has a plurality of sector ring grooves (16, 18), and the adjustable structure rotating disc (5) has a sector boss (23) which is assembled into the sector ring groove at a preset angle, and the plate edge is axially limited by the fixed cover plate 12 fixed on the casing.

[0040] Preferably, the adjustable structure fixed disc 4 has a first outer ring cavity air inlet groove and a first inner ring cavity air inlet groove 17, and the first air inlet hole 15 is located between the first outer ring cavity air inlet groove and the first inner ring cavity air inlet groove 17.

[0041] The adjustable structure rotating disc 5 has a second outer ring cavity air inlet groove and a second inner ring cavity air inlet groove 22 on the disc surface, and the second air inlet hole 20 is located between the second outer ring cavity air inlet groove and the second inner ring cavity air inlet groove 22. The first outer ring cavity air inlet groove and the second outer ring cavity air inlet groove are always in communication, and the first inner ring cavity air inlet groove 17 and the second inner ring cavity air inlet groove 22 are always in communication; the first outer ring cavity air inlet groove and the first inner ring cavity air inlet groove 17 have a first branch arm 19, and the second outer ring cavity air inlet groove and the second inner ring cavity air inlet groove 22 have a second branch arm 24.

[0042] Preferably, the adjustable structure fixed disc 4 and the adjustable structure rotating disc 5 have a circular air hole corresponding to the axial position of the flame tube 3 at the center position.

[0043] Preferably, the first air inlet hole 15 and the second air inlet hole 20 each include a plurality of circumferentially distributed discrete holes, and the circumferential spacing between adjacent discrete holes is at least greater than the circumferential length of one discrete hole.

[0044] Preferably, the fixed shaft has an axial limiting boss 13 and a connecting transmission boss 14, the casing 2 has a guide cylinder formed at the edge of the mounting hole, the fixed shaft is sleeved in the guide cylinder, the axial limiting boss 13 is in contact with the wall surface of the edge of the mounting hole for limiting, the connecting transmission boss 14 is connected with the rotating motion connecting rod 9 for transmitting torque, and is fixed through the compression nut 8.

[0045] The main working characteristics of the adjustable device are as follows: the linear motion of the fixed support 11 fixed to the driving mechanism 10 is converted into circular motion through the rotating motion connecting rod 9, the adjustable structure rotating disc 5 fixed to the adjustable structure fixed disc 4 is driven by the transmission gear 6, and the opening and closing of the head air inlet hole 20 is controlled to adjust the air inlet amount of the head of the flame tube and the two cavity channels. In the large state, the head air inlet hole is in the air passage state, while in the slow car and other small states, the head air inlet hole is in the closed state. The first outer ring cavity air inlet groove and the first inner ring cavity air inlet groove 17 always maintain the air passage state during adjustment.

[0046] The principle of the present application: after the combustion air diffuser in the combustion chamber flows in, the airflow is divided into two streams entering the head of the flame tube and the two annular cavities. Generally, the pressure difference of the airflow entering the flame tube through the head swirler is greater than that of the airflow entering the flame tube through the two annular cavities. By setting an adjustable device in the sudden expansion area of the diffuser, i.e. a variable geometry diffuser, the flow pattern of the airflow entering the flame tube is changed, the pressure difference of the airflow entering the flame tube through the head swirler and the two annular cavities is adjusted, and the purpose of flow redistribution in the head is achieved.

[0047] The advantages of the present application include:

[0048] 1. By adjusting the adjusting mechanism, the airflow is redistributed in the sudden expansion area of the diffuser, the gas amount of the head is increased, and the problem of needing more head intake amount to organize combustion under high temperature rise combustion chamber large state is solved.

[0049] 2. Under slow vehicle small state, by adjusting the adjusting mechanism, the intake hole opposite to the head is closed, the head intake amount is reduced, and the lean blowout and combustion performance requirements of the slow vehicle are met.

[0050] By the present application, the difficulty of designing the head swirler and nozzle is reduced, the adjustable mechanism provided is simple, the engineering realizability is strong, and the adjustable structure has passed the test verification and is effective.

[0051] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical range disclosed in the present application can be easily thought of by those skilled in the art, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A variable geometry diffuser adjustable device, characterized by, It comprises: a diffuser (1), a casing (2), a flame tube (3), an adjustable structure fixed disc (4), an adjustable structure rotating disc (5), and a driving mechanism; The casing (2) forms an annular space for installing the flame tube (3), the diffuser (1) is installed at the front end of the casing (2) to pass air into the annular space, the adjustable structure fixed disc (4) and the adjustable structure rotating disc (5) are installed between the diffuser (1) and the flame tube (3) to adjust the air flow between the diffuser (1) and the flame tube (3); The adjustable structure fixed disc (4) is fixed on the casing (2), and the adjustable structure fixed disc (4) has a plurality of circumferentially distributed first air inlet holes; the adjustable structure rotating disc (5) is rotatably and concentrically installed on the end face of the adjustable structure fixed disc (4), the driving mechanism drives the adjustable structure rotating disc (5) to rotate relative to the adjustable structure fixed disc (4), the adjustable structure rotating disc (5) has second air inlet holes, and the angle between the adjustable structure fixed disc (4) and the adjustable structure rotating disc (5) is changed to change the communication area of the first air inlet holes and the second air inlet holes; The adjustable structure fixed disc (4) has a first outer ring cavity air inlet groove and a first inner ring cavity air inlet groove (17), and the first air inlet holes (15) are located between the first outer ring cavity air inlet groove and the first inner ring cavity air inlet groove (17); The adjustable structure rotating disc (5) has a second outer ring cavity air inlet groove and a second inner ring cavity air inlet groove (22) on the disc face, and the second air inlet holes (20) are located between the second outer ring cavity air inlet groove and the second inner ring cavity air inlet groove (22); The adjustable structure fixed disc (4) and the adjustable structure rotating disc (5) have a circular air hole corresponding to the axial position of the flame tube (3) at the center position.

2. A variable geometry diffuser adjustable device according to claim 1, wherein The driving mechanism comprises: a transmission gear (6), a rotary motion connecting rod (9), and a linear driving mechanism (10); The transmission gear (6) has a gear disc and a fixed shaft located at the center of the gear disc, the fixed shaft is rotatably installed in the mounting hole of the wall surface of the casing (2), and the teeth on the gear disc are engaged with the rack on the disc face of the adjustable structure rotating disc (5); One end of the rotary motion connecting rod (9) is fixedly connected with the fixed shaft of the transmission gear (6), the other end is hingedly connected with the linear driving mechanism (10) fixed on the outside of the casing (2), and the linear motion is converted into circular motion.

3. The variable geometry diffuser adjustable of claim 1, wherein, The transmission gear (6) and the motor; the transmission gear (6) has a gear disc and a fixed shaft located at the center of the gear disc, the fixed shaft is rotatably installed in the mounting hole of the wall surface of the casing (2), and the teeth on the gear disc are engaged with the rack (20) on the disc face of the adjustable structure rotating disc (5); the motor drives the fixed shaft to rotate.

4. The variable geometry diffuser adjustable of claim 1, wherein, The installation mode of the adjustable structure fixed disc (4) and the adjustable structure rotating disc (5) comprises: The edge of the adjustable structure fixed disc (4) has a plurality of fan-shaped ring grooves, and the adjustable structure rotating disc (5) has a plurality of fan-shaped bosses (23) with a preset angle assembled into the fan-shaped ring grooves.

5. The variable geometry diffuser adjustable of claim 1, wherein, The first air inlet holes (15) and the second air inlet holes (20) each comprise a plurality of circumferentially distributed discrete holes, and the circumferential spacing between adjacent discrete holes is at least greater than the circumferential length of one discrete hole.

6. A variable geometry diffuser adjustable device according to claim 2, wherein The fixed shaft has an axial limiting boss (13) and a connecting force transmission boss (14), the edge of the mounting hole of the casing (2) forms a guide cylinder, the fixed shaft is sleeved in the guide cylinder, the axial limiting boss (13) is in contact with the edge wall of the mounting hole for limiting, the connecting force transmission boss (14) is connected with the rotating motion connecting rod (9) for transmitting torque, and is fixed through the compression nut (8).

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