Compressed air flow regulating device and compressed air flow regulating method used for high-speed wind tunnel special test

Abstract

The invention provides a compressed air flow regulating device and a compressed air flow regulating method used for a high-speed wind tunnel special test, belonging to the technical field of dynamic wind tunnel tests. The device comprises a pneumatic regulating valve, a pressure transmitter, a flow regulating and combining unit, a mass flow meter and a PLC (programmable logic controller). With the adoption of the method, based on the change conditions of air volume, a digital mass flow control strategy is adopted, and a fuzzy control manner is adopted for the changes of the air volume; the flow regulating and combing unit is digitally controlled by utilizing the PLC; the pressure transmitter and the mass flow meter are respectively arranged at the front part and at the rear part of the flow regulating and combining unit, and are used for monitoring and collecting the pressure at an inlet of the flow regulating and combining unit, and actual flow output from the flow regulating and combining unit; the actual flow is compared with theoretical flow to calculate a difference value; and the pneumatic regulating valve and the flow regulating and combining unit are controlled through the PLC, so that the flow finally achieves a needed value, and thereby the condition that the compressed air flow in the wind tunnel special test is accurately controlled is realized.

Description

technical field [0001] The invention belongs to the technical field of aerodynamic wind tunnel tests, and in particular relates to a compressed air flow regulating device and method for special tests in high-speed wind tunnels. The device and method are suitable for special test items in high-speed wind tunnel tests that require a large range of air flow and high precision. Background technique [0002] In the wind tunnel test, the control of the input air pressure is extremely demanding. In the conventional high-speed wind tunnel test, the pressure regulating valve is usually used to control the pressure of the stable section of the wind tunnel. The key component of the control is the pressure regulating valve on the air inlet pipeline of the wind tunnel. , the performance of the valve and the adoption of the control strategy are two important factors affecting the quality of the wind tunnel test data. [0003] At present, in domestic high-speed wind tunnel routine tests, ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a compressed air flow regulating device and method for high-speed wind tunnel special tests in view of the problems existing in the prior art, which changes the current domestic high-speed wind tunnel special tests that can only use pneumatic control valves or electric control valves The phenomenon that solves the problem that the test data can only be analyzed qualitatively but not quantitatively

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