Condition determining method satisfying multistage full free flight wind tunnel test similarity law

A technology of wind tunnel test and similarity law, which is applied in the field of aerospace engineering, can solve problems such as horizontal line displacement and vertical line displacement angular displacement not corresponding

Active Publication Date: 2019-11-01
CHINA ACAD OF AEROSPACE AERODYNAMICS
View PDF10 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Condition determining method satisfying multistage full free flight wind tunnel test similarity law
  • Condition determining method satisfying multistage full free flight wind tunnel test similarity law
  • Condition determining method satisfying multistage full free flight wind tunnel test similarity law

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0087] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0088] 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 satisfies the limiting conditions, it can ensure that the horizontal line displacement, vertical line displacement, and angular displacement curves 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.

[0089] ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a condition determining method satisfying a multistage full free flight wind tunnel test similarity law. A dropping type wind tunnel free flight test similarity law is deducedaccording to dynamics and kinematics. Aiming at lifting body appearance and aiming at a totally-free free flight test of a two-stage, even multi-stage model, the test similarity law is designed for the first time, and a lifting body appearance similarity problem is solved emphatically. When the wind tunnel model satisfies a limiting condition, horizontal line displacement and angular displacementcurves obtained by the wind tunnel test can be guaranteed to be similar as the curves of a real aircraft, and the wind tunnel test is guaranteed to be capable of simulating separation conditions of the real aircraft. A difficult problem of absence of similarity law guidance to the two-stage, even multi-stage full free flight test is solved. For the aspect of the absence of the totally-free wind tunnel free flight test similarity law for two, even more aircrafts, conditions satisfying the multi-stage full free flight wind tunnel test similarity law are obtained in the method provided by the invention.

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/08
CPCG01M9/08
Inventor 薛飞郭鹏亮王誉超鲁伟蒋增辉
Owner CHINA ACAD OF AEROSPACE AERODYNAMICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products