Novel technology for controlling M number by second throat

Abstract

A novel technology for controlling an M number by a second throat comprises a control device arranged on a wind tunnel body and a control method thereof. The control device arranged on the wind tunnel body comprises a left wall plate and a right wall plate both with three-sheet adjustable structures as well as an upper gate finger and a lower gate finger, wherein the upper gate finger and the lower gate finger are arranged on the left wall plate and the right wall plate. The left wall plate and the right wall plate are both the three-sheet adjustable structures; the gate fingers are respectively arranged on the left wall plate and the right wall plate and used for finely adjusting the M number, enhancing the M number control precision and making up M number variation caused by model attack angle variation. The control method comprises the following steps: first, adjusting the left wall plate and a right wall plate with the three-sheet adjustable structures to corresponding positions according to M numbers of different experiments; and then finely adjusting the M numbers of the experiment sections through telescopic moving gate fingers of a motor on the upper wall plate and the lower wall plate in the wind tunnel operation process. According to the invention, rapid adjusting response of the second throat is enhanced, the loss of the second throat is reduced, reasonable design is obtained, and requirements on higher adjusting speed and control precision are satisfied.

Description

technical field [0001] The invention relates to a technology for controlling the M-number through two throats in a wind tunnel, in particular to a novel two-throat control M-number technology controlled by grid-finger-type two-throats and regulating plate-type two-throats. Background technique [0002] In the wind tunnel control, the subsonic second throat plays a key role in two aspects: [0003] 1. Play the role of blockage and interception, achieve the purpose of controlling and stabilizing the M number (Mach number) of the test section by limiting the mass flow rate of the entire pipeline, and suppress the downstream dynamic disturbance forward transmission. [0004] 2. It has the ability of quick adjustment, that is, the small adjustment device in the second throat can quickly and accurately change the effective interception area to achieve the purpose of quickly fine-tuning the M number of the test section. [0005] At present, the secondary throats of wind tunnels ar...

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Problems solved by technology

[0006] 1. The structure of the adjustable plate-type secondary throat is simple and the loss is low, but due to the large aerodynamic load and structural inertia, it is difficult to adjust during the test

[0007] 2. The gate finger type two-throat control has high control precision and high control efficiency, but the loss is too large and the structure is complicated

[0008] 3. In the previous design, it was difficult to reduce the loss of the interception device while meeting the control and structural design requirements

[0009] 4. At present, the two-throat design concept adopted by wind tunnels at home and abroad brings more or less difficulties to mechanical design and measurement and control systems

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