A Method for Determining the Conditions Satisfying the Similarity Law of Multi-level Full Free-flying Wind Tunnel Test

Abstract

The invention discloses a condition determination method satisfying the similarity law of a multi-stage full-free-flying wind tunnel test. Based on the dynamics and kinematics, the similarity law is derived for the free flight test in a wind-like tunnel. For the first time, the similarity law is designed for the free flight test of two-level or even multi-level models for the shape of the lifting body, focusing on solving the similarity problem of the shape of the lifting body. When the wind tunnel test model meets the limiting conditions, it can ensure that the horizontal line displacement, vertical line displacement, and angular displacement curve obtained by the wind tunnel test are similar to the curves of the real aircraft, ensuring that the wind tunnel test can simulate the separation of the real aircraft. It solves the problem that there is no similarity law guidance for two-stage or even multi-stage full-free flight tests. There is a lack of similarity laws for two or more aircrafts that are completely free in wind tunnel free flight tests. The present invention aims at this aspect and obtains the conditions for satisfying the similarity laws of multi-level full free flight wind tunnel tests.

Description

technical field [0001] The invention relates to the parameter design of a free flight test, in particular to a condition determination method satisfying the similarity law of a multi-level full free flight wind tunnel test, and belongs to the field of aerospace engineering. Background technique [0002] The two-stage orbiting vehicle is in a high Ma and high dynamic pressure environment during the separation between the stages, and there are complex aerodynamic interference phenomena during the separation, which makes the separation safety uncertain. In order to ensure the safety of separation, it is necessary to study the separation characteristics of the two-stage orbiting vehicle. In recent years, the multi-body separation full free flight wind tunnel test is a research hotspot in the field of wind tunnel free flight, especially in recent years, the multi-body separation full free flight test technology has made considerable progress, although the test technology has made...

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is: to overcome the deficiencies in the prior art, to provide a condition determination method satisfying the similarity law of the multi-level full free-flying wind tunnel test, and for the first time to aim at the shape of the lifting body and the completely free free-flying of the two-level or even multi-level models Experimental design and experimental similarity law, focusing on solving the problem of similarity in the shape of lifting bodies

Solved the problem that the horizontal line displacement, vertical line displacement and angular displacement did not correspond between the previous wind tunnel test and the real aircraft, improved the accuracy of the wind tunnel test, and played a guiding role in the development of the real aircraft

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