Prediction method of flow transition position on surface of Mars enterer

Abstract

The invention discloses a method for predicting a flow transition position on the surface of a Mars enterer, comprising: performing computational fluid dynamics simulation based on a Mars atmospheric model and using a thermochemical non-equilibrium model to obtain flow field data around the Mars enterer; The model line is used as a reference to generate a transition prediction grid, and the data around the flow field are interpolated to the transition prediction grid to obtain the transition prediction flow field data; based on the transition prediction flow field data, the total enthalpy of the flow field is calculated and the boundary layer external edge position, calculate the first Reynolds number based on the thickness of the momentum loss by integrating in the boundary layer along the normal direction of the wall, and calculate the second Reynolds number based on the roughness height; the first Reynolds number and the second Reynolds number are used as transition criteria, The first transition criterion and the second transition criterion are calculated respectively, and the transition position of the flow on the surface of the Mars enterer is obtained based on the first transition criterion and the second transition criterion. A method for predicting the flow transition position on the surface of the Mars entrant is provided.

Description

technical field [0001] The invention relates to the technical field of aerodynamics, and more particularly, to a method for predicting the transition position of flow on the surface of a Mars entrant. Background technique [0002] Boundary layer transition has an important impact on the design of propulsion and thermal protection systems of hypersonic vehicles. However, since the transition process is affected by many factors and the mechanism is complicated, it is difficult to accurately predict the transition, whether it is theoretical analysis, numerical calculation or wind tunnel test. [0003] At present, there are mainly four prediction methods for transition prediction, which are engineering transition criterion judgment method, e N method, transition model method, direct numerical simulation method / large eddy simulation method. [0004] The engineering transition criterion gives the engineering calculation formula of the transition Reynolds number through the analy...

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Problems solved by technology

[0008] The purpose of the present invention is to propose a method for predicting the transition position of the flow on the surface of the Mars enterer, to overcome the problem that the existing transition prediction method cannot be applied to the atmosphere of Mars, and to provide a method for predicting the transition position of the flow on the surface of the Mars enterer

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