Method for obtaining mixed gas incoming flow operation parameters in shock tunnel

Abstract

The invention discloses a method for obtaining mixed gas incoming flow operation parameters in a shock tunnel. In the test of the shock tunnel, the specific heat ratio of incoming flow gas is an important physical quantity; for air, the specific heat ratio is less affected by temperature, and the incoming flow Mach number can be obtained; for mixed gas, the specific heat ratio is liable to change along with temperature, so that the determining of the Mach number is difficult. In the number simulation, the specific heat ratio of the common gas is constant, namely the equivalent specific heat ratio; the number is very critical to the parameter calculation of the flow field, but the number is different in literature and data, and is difficult to determine. The method has the advantages that by combining test and theoretical analysis, the equivalent specific heat ratio of the test gas is obtained, and the basis is provided for the study of incoming flow test of the special gas, especially the deep air detection method.

Description

technical field [0001] The invention relates to a method for obtaining operating parameters of mixed gas inflow in a shock wave wind tunnel, which is used in the field of deep space detection. Background technique [0002] Entering the 21st century, spaceflight countries around the world have launched new development strategies and plans for deep space exploration, including multiple projects to launch landers to extraterrestrial objects. Since the atmospheric environment and aerodynamic heating principles of most extraterrestrial celestial bodies are quite different from those of the earth (different components and densities), the solution to a series of problems such as surface aerodynamic thermal protection and aerodynamic orbit change control of the reentry probe Research presents entirely new challenges. [0003] Our country has not carried out systematic research on the aerodynamic characteristics of special gas flow, and there is still a lack of clear understanding o...

AI Technical Summary

Problems solved by technology

Since the atmospheric environment and aerodynamic heating principles of most extraterrestrial celestial bodies are quite different from those of the earth (different components and densities), the solution to a series of problems such as surface aerodynamic thermal protection and aerodynamic orbit change control of the reentry probe Research presents entirely new challenges

[0003] Our country has not carried out systematic research on the aerodynamic characteristics of special gas flow, and there is still a lack of clear understanding of this type of problem, and the relevant aerodynamic and aerothermal test techniques are also relatively scarce

The premise of carrying out research in this direction is to determine the flow parameters of special gases and mixed gases, and foreign literature has not elaborated on this part of the content

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