Ultra-wide flow regulation range low-resistance wind tunnel power section and working method

Abstract

The application discloses a kind of super-wide flow regulation range low-resistance wind tunnel power section and working method, the wind tunnel power section includes air inlet, inlet section outer wall, large fan inlet outer wall, power section large fan support section outer wall, outlet section outer wall, air outlet, small fan, large fan, non-full circle support structure, actuator outer slide, on-off execution pipe section, the present application is based on the wind tunnel power section design scheme of large and small fan combination parallel structure and the working mode of wind tunnel power section using on-off execution pipe section to realize the flow passage on-off of large and small fan, can realize the use requirement of wind tunnel in super-wide flow range continuous measurement aerodynamic parameter without replacing wind tunnel power section, the present application and working method have the advantages of low flow resistance, low noise, simple operation, time saving and labor saving.

Description

Technical Field

[0001] The present invention relates to the technical field of gas transportation or wind tunnel flow velocity measurement, and in particular to a low-resistance wind tunnel power section with an ultra-wide flow adjustment range and a working method. Background Art

[0002] Wind tunnels are essential metrological equipment for simulating specific flow fields and measuring fundamental parameters such as flow velocity. The power section of a wind tunnel typically consists of a single fan and a tube wall connected to the wind tunnel. Limited by the fan's narrow flow range, traditional methods require the use of two or more power sections with different flow ranges to expand the wind tunnel's flow range. When using two or more power sections with different flow ranges, the fan in the existing power section must be shut down, the existing section removed, and a new section inserted to connect to the wind tunnel. Finally, the new section must be started to complete the measurement of relevant aerodynamic parameters. However, wind tunnel power sections are large and heavy, making the process of replacing a wind tunnel power section time-consuming and labor-intensive. Furthermore, measurements must be suspended during the replacement, making it impossible to continuously measure aerodynamic parameters over an extremely wide flow range. Consequently, wind tunnel testers have been unable to conduct continuous measurements over an extremely wide flow range, a technical challenge that has severely plagued both testers and wind tunnel designers. Currently, no mature technical solution exists to address these challenges. Summary of the Invention

[0003] The purpose of the present invention is to provide a low-resistance wind tunnel power section with an ultra-wide flow adjustment range and a working method in order to solve the above problems.

[0004] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0005] The invention discloses a low-resistance wind tunnel power section with an ultra-wide flow adjustment range, comprising an air inlet (1), an inlet section outer wall (2), a large fan inlet outer wall (3), a power section large fan support section outer wall (4), an outlet section outer wall (5), an air outlet (6), a small fan (7), a large fan (8), a non-full-circumference support structure (9), an actuator outer slideway (10), and an on-off actuator pipe section (11), wherein the air inlet (1) is connected to the inlet section outer wall (2), the large fan inlet outer wall (3) is connected to the power section large fan support section outer wall (4), the outlet section outer wall (5) is connected to the power section large fan support section outer wall (4), and the air outlet (6) is connected to the outlet. The large fan guide vane fixing ring (84) is fixed on the inner side of the large fan support section outer wall (4) of the power section. The small fan (7) includes a small fan inlet guide structure (71), a small fan moving blade (72), a small fan guide vane (73), a small fan guide vane fixing ring (74) and a small fan motor (75). The large fan (8) includes a large fan inlet guide structure (81), a large fan moving blade (82), a large fan guide vane (83), a large fan guide vane fixing ring (84), a large fan outlet guide structure (85) and a large fan motor (86). The large fan motor (86) is respectively connected to the large fan inlet guide structure (81). ), a large fan rotor blade (82), a large fan guide blade (83), and a large fan outlet guide structure (85) are connected, and a small fan motor (75) is respectively connected to the small fan inlet guide structure (71), the small fan rotor blade (72), the small fan guide blade (73), the small fan guide blade fixing ring (74), and the large fan inlet guide structure (81). The axial cross-sectional area of ​​the inlet section outer wall (2) shows a trend of continuous increase from the inlet to the outlet, the axial cross-sectional area of ​​the large fan inlet outer wall (3) shows a trend of continuous decrease from the inlet to the outlet, and the axial cross-sectional area of ​​the outlet section outer wall (5) shows a trend of continuous increase from the inlet to the outlet. The non-full-circumference support structure (9) is fixed at a position where the outer wall of the inlet section (2) and the outer wall of the large fan inlet (3) are connected. The outer slide of the actuator (10) is fixed on the non-full-circumference support structure (9). The non-full-circumference support structure (9) is a non-full-circumference closed support structure through which gas can pass. The on-off actuator pipe section (11) is limited to axial movement in the annular gap between the outer slide of the actuator (10) and the small fan guide vane fixing ring (74) and can reach the wall surface of the outer wall of the inlet section (2) or the wall surface of the large fan inlet guide structure (81). The maximum flow value of the flow range of the small fan (7) is greater than the minimum flow value of the flow range of the large fan (8).

[0006] The working method of the ultra-wide flow regulation range low resistance wind tunnel power section includes a small fan working condition and a large fan working condition. The small fan working condition refers to the on-off execution pipe section (11) moving along the annular gap between the actuator outer slideway (10) and the small fan guide vane fixing ring (74) to the wall surface of the inlet section outer wall (2). At this time, air flows in from the ultra-wide flow regulation range low resistance wind tunnel power section air inlet (1), flows through the front of the inlet section outer wall (2), and The air enters the space formed by the inner wall of the on-off execution pipe section (11) and the outer wall of the small fan inlet guide structure (71), enters the small fan rotor blade (72) and the small fan guide blade (73) of the small fan (7), and is accelerated. Then, it flows out from the outer side of the wall of the large fan inlet guide structure (81), and enters the stationary large fan rotor blade (82) area, the large fan guide blade (83) area, the inner wall of the outlet section outer wall (5), and the large fan outlet guide structure (85) in sequence. The air flows out of the ultra-wide flow adjustment range low resistance wind tunnel power section from the air outlet (6); the large fan working condition refers to the on-off execution pipe section (11) moving along the annular gap between the actuator outer slideway (10) and the small fan guide vane fixing ring (74) to the wall surface of the large fan inlet guide structure (81), at which time the air flows in from the ultra-wide flow adjustment range low resistance wind tunnel power section air inlet (1), flows through the inner side of the inlet section outer wall (2) , the inner side of the large fan inlet outer wall (3), the outer side of the small fan inlet guide structure (71), the outer side of the actuator outer slide (10), and the outer side of the on-off actuator section (11), and then enter the large fan rotor blade (82) area and the large fan guide vane (83) area in turn, and accelerate into the area surrounded by the inner wall surface of the outlet section outer wall (5) and the outer wall surface of the large fan outlet guide structure (85), and finally flow out of the ultra-wide flow adjustment range low resistance wind tunnel power section from the outlet (6).

[0007] The beneficial effects of the present invention are:

[0008] At present, there is no mature technical solution for a wind tunnel power section with an ultra-wide flow range that can be applied to continuously measure aerodynamic parameters. In view of the ultra-wide flow range and the operating conditions that can be used without replacing the power section, the present invention proposes a low-cost, highly operable and ultra-wide flow adjustment range low-resistance wind tunnel power section design. The present invention uses an independently developed small fan with 12 times the flow adjustment capacity and a large fan with 6 times the flow adjustment energy. It adopts a design scheme based on a combined parallel structure of large and small fans. Through the creative design of the on-off execution pipe section, the on-off of the flow channels of the large and small fans is controlled, so that the working fluid forms two flow schemes through the wind tunnel power section. One is that the large fan is stationary and the working fluid is only pressurized and accelerated by the work of the small fan. The other is that the small fan is stationary and completely isolated, and the working fluid is only pressurized and accelerated by the work of the large fan. Based on the above two forms, the flow adjustment range of the small fan can be superimposed on the flow adjustment range of the large fan, so that the combined wind tunnel power section has an ultra-wide flow adjustment range with a maximum-to-minimum flow ratio of 63 times, thereby achieving the goal of not replacing the power section. Under such circumstances, it meets the requirements of the wind tunnel for continuous measurement of aerodynamic parameters in an ultra-wide flow range, and compared with the opening and closing scheme of vertical movement or inclined movement, the flow resistance in the power section of the wind tunnel will be greatly increased, which will cause actuator swing, reduce actuator life, reduce wind tunnel measurement accuracy and other problems. The opening and closing scheme of the horizontally moving actuator outer slide and the on-off actuator pipe section is an aerodynamic scheme that minimizes the flow resistance in the power section of the wind tunnel, eliminates the swing and damage of the Karman vortex street or low-pressure unstable cyclone to the actuator and supporting structure, and eliminates the influence of the Karman vortex street or low-pressure unstable cyclone on the wind tunnel measurement accuracy. Therefore, the opening and closing scheme of the horizontally moving actuator outer slide and the on-off actuator pipe section is the solution with the lowest cost, high reliability and longest life. In addition, in this scheme, the axial cross-sectional area of ​​the outer wall of the inlet section shows a trend of continuous increase from the inlet to the outlet, the axial cross-sectional area of ​​the outer wall of the inlet of the large fan shows a trend of continuous decrease from the inlet to the outlet, and the axial cross-sectional area of ​​the outer wall of the outlet section shows a trend of continuous increase from the inlet to the outlet. The above structural design can greatly reduce the flow resistance of the wind tunnel power section, thereby also reducing the aerodynamic noise level of the wind tunnel power section. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the power section of the low-resistance wind tunnel with an ultra-wide flow adjustment range of the present invention.

[0010] Figure 2 This is a schematic diagram of the working state of the power section of the low-resistance wind tunnel with an ultra-wide flow adjustment range of the present invention, where (a) is the working condition of a small fan and (b) is the working condition of a large fan. DETAILED DESCRIPTION

[0011] The present invention will be further described below in conjunction with the accompanying drawings:

[0012] like Figure 1 As shown, the power section of the wind tunnel with ultra-wide flow adjustment range and low resistance comprises an air inlet (1), an inlet section outer wall (2), a large fan inlet outer wall (3), a power section large fan support section outer wall (4), an outlet section outer wall (5), an air outlet (6), a small fan (7), a large fan (8), a non-full-circumference support structure (9), an actuator outer slideway (10), and an on-off actuator pipe section (11), wherein the air inlet (1) is connected to the inlet section outer wall (2), the large fan inlet outer wall (3) is connected to the power section large fan support section outer wall (4), the outlet section outer wall (5) is connected to the power section large fan support section outer wall (4), and the air outlet (6) is connected to the The outlet section outer wall (5) is connected, the large fan guide vane fixing ring (84) is fixed on the inner side of the large fan support section outer wall (4) of the power section, the small fan (7) includes a small fan inlet guide structure (71), a small fan moving blade (72), a small fan guide vane (73), a small fan guide vane fixing ring (74) and a small fan motor (75), the large fan (8) includes a large fan inlet guide structure (81), a large fan moving blade (82), a large fan guide vane (83), a large fan guide vane fixing ring (84), a large fan outlet guide structure (85) and a large fan motor (86), and the large fan motor (86) is respectively connected to the large fan inlet guide structure ( 81), a large fan rotor blade (82), a large fan guide blade (83), and a large fan outlet guide structure (85) are connected, and a small fan motor (75) is respectively connected to the small fan inlet guide structure (71), the small fan rotor blade (72), the small fan guide blade (73), the small fan guide blade fixing ring (74) and the large fan inlet guide structure (81). The axial cross-sectional area of ​​the inlet section outer wall (2) shows a trend of continuous increase from the inlet to the outlet, the axial cross-sectional area of ​​the large fan inlet outer wall (3) shows a trend of continuous decrease from the inlet to the outlet, and the axial cross-sectional area of ​​the outlet section outer wall (5) shows a trend of continuous increase from the inlet to the outlet. The non-full-circumference support structure (9) is fixed at a position where the outer wall of the inlet section (2) and the outer wall of the large fan inlet (3) are connected. The outer slide of the actuator (10) is fixed on the non-full-circumference support structure (9). The non-full-circumference support structure (9) is a non-full-circumference closed support structure through which gas can pass. The on-off actuator pipe section (11) is limited to axial movement in the annular gap between the outer slide of the actuator (10) and the small fan guide vane fixing ring (74). It can reach the wall surface of the outer wall of the inlet section (2) or the wall surface of the large fan inlet guide structure (81). The maximum flow value of the flow range of the small fan (7) is greater than the minimum flow value of the flow range of the large fan (8).

[0013] As a preferred embodiment of the present invention, Figure 2As shown, the working method of the ultra-wide flow adjustment range low resistance wind tunnel power section includes a small fan working condition and a large fan working condition. The small fan working condition refers to the on-off execution pipe section (11) moving along the annular gap between the actuator outer slideway (10) and the small fan guide vane fixing ring (74) to the wall surface of the inlet section outer wall (2). At this time, air flows in from the ultra-wide flow adjustment range low resistance wind tunnel power section air inlet (1) and flows through the inlet section outer wall (2 ) and the space enclosed by the inner wall of the on-off execution pipe section (11) and the outer wall of the small fan inlet guide structure (71), enters the small fan rotor blade (72) and the small fan guide vane (73) of the small fan (7) to accelerate, then flows out from the outer side of the large fan inlet guide structure (81), and successively enters the stationary large fan rotor blade (82) area, the large fan guide vane (83) area, the inner wall of the outlet section outer wall (5) and the large fan outlet guide structure (85). ) and finally flows out of the ultra-wide flow adjustment range low resistance wind tunnel power section from the air outlet (6); the large fan working condition refers to the on-off execution pipe section (11) moving along the annular gap between the actuator outer slideway (10) and the small fan guide vane fixing ring (74) to the wall surface of the large fan inlet guide structure (81), at which time the air flows in from the ultra-wide flow adjustment range low resistance wind tunnel power section air inlet (1), flows through the inner wall of the inlet section outer wall (2) The air flows along the side of the large fan inlet outer wall (3), the outside of the small fan inlet guide structure (71), the outside of the actuator outer slide (10), and the outside of the on-off actuator section (11), and enters the large fan rotor blade (82) area and the large fan guide vane (83) area in sequence, and accelerates into the area surrounded by the inner wall surface of the outlet section outer wall (5) and the outer wall surface of the large fan outlet guide structure (85), and finally flows out of the ultra-wide flow adjustment range low resistance wind tunnel power section from the air outlet (6).

[0014] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. Any technical variations made according to the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. Ultra-wide flow adjustment range and low resistance wind tunnel power section, characterized by: The invention comprises an air inlet (1), an outer wall of an inlet section (2), an outer wall of a large fan inlet (3), an outer wall of a large fan support section of a power section (4), an outer wall of an outlet section (5), an air outlet (6), a small fan (7), a large fan (8), a non-full-circumference support structure (9), an outer slideway of an actuator (10), and an on-off actuator pipe section (11), wherein the air inlet (1) is connected to the outer wall of the inlet section (2), the outer wall of the large fan inlet (3) is connected to the outer wall of the large fan support section of the power section (4), the outer wall of the outlet section (5) is connected to the outer wall of the large fan support section of the power section (4), the air outlet (6) is connected to the outer wall of the outlet section (5), and the large fan guide pipe section (11) is connected to the outer wall of the outlet section (5). The blade fixing ring (84) is fixed on the inner side of the outer wall (4) of the large fan support section of the power section. The small fan (7) includes a small fan inlet guide structure (71), a small fan moving blade (72), a small fan guide blade (73), a small fan guide blade fixing ring (74) and a small fan motor (75). The large fan (8) includes a large fan inlet guide structure (81), a large fan moving blade (82), a large fan guide blade (83), a large fan guide blade fixing ring (84), a large fan outlet guide structure (85) and a large fan motor (86). The large fan motor (86) is respectively connected to the large fan inlet guide structure (81), the large fan moving blade ( 82), a large fan guide vane (83), and a large fan outlet guide structure (85), the small fan motor (75) is respectively connected to the small fan inlet guide structure (71), the small fan rotor blade (72), the small fan guide vane (73), the small fan guide vane fixing ring (74) and the large fan inlet guide structure (81), the axial cross-sectional area of ​​the inlet section outer wall (2) shows a trend of continuous increase from the inlet to the outlet, the axial cross-sectional area of ​​the large fan inlet outer wall (3) shows a trend of continuous decrease from the inlet to the outlet, the axial cross-sectional area of ​​the outlet section outer wall (5) shows a trend of continuous increase from the inlet to the outlet, and the non-full circumferential support The support structure (9) is fixed at a position where the outer wall of the inlet section (2) and the outer wall of the large fan inlet (3) are connected. The actuator outer slide (10) is fixed on the non-full-circumference support structure (9). The non-full-circumference support structure (9) is a non-full-circumference closed support structure through which gas can pass. The on-off actuator pipe section (11) is limited to axial movement in the annular gap between the actuator outer slide (10) and the small fan guide vane fixing ring (74). It can reach the wall surface of the inlet section outer wall (2) or the wall surface of the large fan inlet guide structure (81). The maximum flow value of the flow range of the small fan (7) is greater than the minimum flow value of the flow range of the large fan (8).

2. The method for operating the power section of a low-resistance wind tunnel with an ultra-wide flow adjustment range according to claim 1, characterized in that: The working method includes a small fan working condition and a large fan working condition. The small fan working condition refers to the on-off execution pipe section (11) moving along the annular gap between the actuator outer slideway (10) and the small fan guide vane fixing ring (74) to the wall surface of the inlet section outer wall (2). At this time, air flows in from the ultra-wide flow adjustment range low resistance wind tunnel power section air inlet (1), flows through the space surrounded by the front wall surface of the inlet section outer wall (2), the inner wall surface of the on-off execution pipe section (11), and the outer wall surface of the small fan inlet guide structure (71), enters the small fan blade (72) and the small fan guide vane (73) of the small fan (7) to accelerate, and then flows out from the outer side of the large fan inlet guide structure (81), and successively enters the stationary large fan blade (82) area, the large fan guide vane (83) area, and the area surrounded by the inner wall surface of the outlet section outer wall (5) and the outer wall surface of the large fan outlet guide structure (85). Finally, the air flows out of the ultra-wide flow adjustment range low-resistance wind tunnel power section from the air outlet (6); the large fan working condition refers to the on-off execution pipe section (11) moving along the annular gap between the actuator outer slide (10) and the small fan guide vane fixing ring (74) to the wall surface of the large fan inlet guide structure (81), at which time the air flows in from the ultra-wide flow adjustment range low-resistance wind tunnel power section air inlet (1), flows through the inner side of the inlet section outer wall (2), the inner side of the large fan inlet outer wall (3), and the outer side of the small fan inlet guide structure (71), the outer side of the actuator outer slide (10), and the outer side of the on-off execution pipe section (11), and successively enters the large fan blade (82) area and the large fan guide vane (83) area, accelerates to enter the area surrounded by the inner wall surface of the outlet section outer wall (5) and the outer wall surface of the large fan outlet guide structure (85), and finally flows out of the ultra-wide flow adjustment range low-resistance wind tunnel power section from the air outlet (6).

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