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

Abstract

The invention discloses a low-resistance wind tunnel power section with an ultra-wide flow regulation range and a working method, and the wind tunnel power section comprises an air inlet, an inlet section outer wall, a large fan inlet outer wall, a power section large fan supporting section outer wall, an outlet section outer wall, an air outlet, a small fan, a large fan, a non-full-circumference supporting structure, an actuator outer slide way, and an on-off execution pipe section. Based on the design scheme of the wind tunnel power section of the large and small fan combined parallel structure and the working mode of the wind tunnel power section for realizing the on-off of the flow channels of the large and small fans by adopting the on-off execution pipe section, the use requirement of the wind tunnel for continuously measuring pneumatic parameters in an ultra-wide flow range can be met under the condition that the wind tunnel power section is not replaced; the working method has the advantages of being low in flow resistance, low in noise, easy and convenient to operate, time-saving and labor-saving and the like.

Description

Technical Field

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

[0002] Wind tunnel is one of the important metrological equipment for simulating specific flow fields and conducting basic parameter measurements such as flow velocity measurement. Among them, the power section of the wind tunnel is usually composed of a single fan and a pipe wall connected to the wind tunnel. Due to the narrow flow range of the fan itself, in order to expand the flow range of the wind tunnel, the traditional method requires the use of two or more wind tunnel power sections with different flow ranges. When using two or more wind tunnel power sections with different flow ranges, it is necessary to shut down the fan of the running wind tunnel power section, then move the original wind tunnel power section away, and then move in the new wind tunnel power section to connect with the wind tunnel, and finally start the new wind tunnel power section to complete the measurement of relevant aerodynamic parameters of the wind tunnel. However, the wind tunnel power section is large in size and heavy in weight. The above process of replacing the wind tunnel power section is not only time-consuming and labor-intensive, but also the measurement can only be stopped during the replacement of the wind tunnel power section, and it is impossible to achieve continuous measurement of aerodynamic parameters when the wind tunnel changes continuously in an ultra-wide flow range. Therefore, wind tunnel testers have always been unable to carry out continuous measurement of ultra-wide flow ranges. The above technical difficulties have seriously troubled testers and wind tunnel designers. At present, there is no mature technical solution to solve the above problems. 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-mentioned problems.

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

[0005] An ultra-wide flow regulation range low resistance wind tunnel power section 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 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) comprises 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) comprises 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) and the large fan motor (86). ), a large fan impeller (82), a large fan guide vane (83), and a large fan outlet flow guide structure (85); a small fan motor (75) is respectively connected to a small fan inlet flow guide structure (71), a small fan impeller (72), a small fan guide vane (73), a small fan guide vane fixing ring (74), and a large fan inlet flow guide structure (81); an axial cross-sectional area of ​​an inlet section outer wall (2) shows a trend of continuously increasing from the inlet to the outlet; an axial cross-sectional area of ​​an inlet outer wall (3) of the large fan shows a trend of continuously decreasing from the inlet to the outlet; and an axial cross-sectional area of ​​an outlet section outer wall (5) shows a trend of continuously increasing from the inlet to the outlet. The non-full-circumference support structure (9) is fixed at a position where the inlet section outer wall (2) and the large fan inlet outer wall (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 restricted to axial movement in the annular gap between the actuator outer slide (10) and the small fan guide vane fixing ring (74), and can reach the wall surface of the inlet section outer wall (2) or the wall surface of the large fan inlet guide structure (81), and the maximum flow value of the small fan (7) flow range is greater than the minimum flow value of the large fan (8) flow range.

[0006] 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 actuator 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 front of the inlet section outer wall (2). The air flows into the space formed by the partial wall surface, 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), and enters the small fan rotor blades (72) and the small fan guide blades (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 rotor blades (82) area, the large fan guide blades (83) area, the inner wall surface of the outlet section outer wall (5), and the large fan outlet guide structure (85). The air flows into the area surrounded by the outer wall of the wind tunnel with a wide flow adjustment range and a low resistance wind tunnel power section from the air outlet (6); the large fan working condition refers to the on-off actuator 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 air inlet (1) of the wind tunnel power section with a wide flow adjustment range and a low resistance wind tunnel power section, and 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 enter the large fan rotor blade (82) area and the large fan guide blade (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 the 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 use conditions where the power section can be used without replacing the power section, the present invention proposes a low-cost, high-operability 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, and adopts a design scheme based on a combined parallel structure of large and small fans. The on-off execution pipe section is creatively designed to control the on-off of the large and small fan flow channels, 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 and minimum flow ratio of 63 times, thereby achieving the situation that the power section is not replaced. Under this circumstance, it meets the use requirements of the wind tunnel for continuous measurement of aerodynamic parameters in an ultra-wide flow range, and compared with the opening and closing schemes of vertical 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 continuously increasing 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 continuously decreasing from the inlet to the outlet, and the axial cross-sectional area of ​​the outer wall of the outlet section shows a trend of continuously increasing 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 It 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, wherein (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 low-resistance wind tunnel with an ultra-wide flow adjustment range 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 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 ( The large fan motor (75) is connected to the large fan inlet guide structure (71), the small fan motor blade (72), the small fan guide blade (73), the small fan guide blade fixing ring (74) and the large fan inlet guide structure (81), respectively; the axial cross-sectional area of ​​the inlet section outer wall (2) shows a trend of continuously increasing from the inlet to the outlet; the axial cross-sectional area of ​​the large fan inlet outer wall (3) shows a trend of continuously decreasing from the inlet to the outlet; and the axial cross-sectional area of ​​the outlet section outer wall (5) shows a trend of continuously increasing from the inlet to the outlet. The non-full-circumference support structure (9) is fixed at a position where the inlet section outer wall (2) and the large fan inlet outer wall (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), and 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).

[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 actuator 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 blades (72) and the small fan guide blades (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 blades (82), the large fan guide blades (83), 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 actuator 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), and flows out of the ultra-wide flow adjustment range low resistance wind tunnel power section air outlet (6) and finally ... The air passes through the side of the fan, 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 slideway (10), and the outer side of the on-off actuator pipe section (11), and enters the large fan rotor blade (82) area and the large fan guide blade (83) area in sequence, and is accelerated 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. All 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 low resistance wind tunnel power section, characterized by: The invention 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), the air outlet (6) is connected to the outlet section outer wall (5), and the large fan guide pipe section (11) is connected to the power section large fan support section outer wall (4), and the air outlet (6) is connected to the outlet section outer wall (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 ( The small fan motor (75) is respectively connected to the small fan inlet guide structure (71), the small fan rotor blades (72), the small fan guide vanes (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 continuously increasing from the inlet to the outlet; the axial cross-sectional area of ​​the large fan inlet outer wall (3) shows a trend of continuously decreasing from the inlet to the outlet; the axial cross-sectional area of ​​the outlet section outer wall (5) shows a trend of continuously increasing from the inlet to the outlet; and the non-full-circumference support The support structure (9) is fixed at a position where the inlet section outer wall (2) and the large fan inlet outer wall (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), and can reach the wall surface of the inlet section outer wall (2) or the wall surface of the large fan inlet guide structure (81), and the maximum flow value of the small fan (7) flow range is greater than the minimum flow value of the large fan (8) flow range.

2. The working method of the ultra-wide flow adjustment range low resistance wind tunnel power section according to claim 1 is 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 blades (72) and the small fan guide vanes (73) of the small fan (7) to accelerate, and then flows out from the outer side of the wall surface of the large fan inlet guide structure (81), and successively enters the stationary large fan blades (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 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), and the outer side of the small fan inlet guide structure (71), the outer side of the actuator outer slideway (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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