Wind tunnel force measurement test device and method capable of automatically switching free rotation and forced rotation

Abstract

The invention discloses a wind tunnel force measurement test device capable of automatically switching free rotation and forced rotation, which comprises a forced rotation assembly and an automatic switching assembly, and the forced rotation assembly and the automatic switching assembly are arranged in a test model, and the forced rotation assembly and the automatic switching assembly are matched to stably drive the test model to perform forced rotation; the structure and the connection mode of each component in the automatic switching assembly are designed, and the test requirement of switching different test models between free rotation and forced rotation back and forth is met through the electromagnetic braking principle. The invention discloses a wind tunnel force measurement test method capable of automatically switching free rotation and forced rotation, which realizes static and dynamic force measurement tests of a test model under different incoming flow Mach numbers, tail strut attitudes, empennage canard rudder surface angles and spinning angle speeds, and is simple in structure, convenient to disassemble and assemble and easy to operate and control.

Description

technical field [0001] The invention relates to a wind tunnel force measuring test device and method for automatically switching between free rotation and forced rotation, and belongs to the technical field of wind tunnel tests. Background technique [0002] In order to simplify the control system and overcome the influence of unfavorable factors such as thrust eccentricity, aerodynamic eccentricity, and mass eccentricity, the missile is often rotated at a low speed during flight, but the rotation of the missile produces another unfavorable factor---the lateral induction effect, which is called is the Magnus effect. This effect has a serious impact on the stability and maneuverability of the missile. The purpose of the Magnus effect test is to measure the magnitude of the Magnus force and moment on the rotating model through wind tunnel tests, and to study the effects of different aerodynamic shapes, Mach number, Reynolds number, angle of attack, and rotation rate on the Ma...

AI Technical Summary

Problems solved by technology

The rotation of the model is generated by the rolling moment generated by the inclined wings on the projectile or different rudder deflection angles. The rotation speed of the model has a stable value. Changes such as the angle of attack of the model, while free rotation often cannot obtain complete Magnus effect data because the mechanical damping of the support system cannot reach the required rotation rate, and it is more used for rotation rate and rotation damping tests; forced rotation is With the help of external force to force the model to rotate, the speed of the model is constantly changing. Use the acceleration method or deceleration method to record the change of the aerodynamic data of the model with the speed. data, or changing the rotation rate at each angle of attack, but sometimes high speeds of 100,000rpm are required to simulate the rotation rate parameters of full-scale flight. If driven by a reasonable size motor, it is very difficult to achieve such speeds, even Impossible, higher RPM models are generally not suitable for motor drives

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