Method for predicting surface flow transition position of Mars entering device

Abstract

The invention discloses a method for predicting the surface flow transition position of a Mars entering device, and the method comprises the steps: carrying out computational fluid mechanics simulation based on a Mars atmosphere model by employing a thermochemical non-equilibrium model, and obtaining the streaming field data of the Mars entering device; generating a transition prediction grid by taking the molded line of the Mars entering device as a reference, and interpolating the streaming field data into the transition prediction grid to obtain transition prediction flow field data; calculating the total enthalpy of the flow field based on the transition prediction flow field data, obtaining the outer edge position of the boundary layer, carrying out the integral calculation on a first Reynolds number based on the momentum loss thickness in the boundary layer in the normal direction of the wall surface, and calculating a second Reynolds number based on the roughness height; and taking the first Reynolds number and the second Reynolds number as transition criteria, respectively calculating a first transition criterion and a second transition criterion, and obtaining the transition position of the surface flow of the Mars entering device based on the first transition criterion and the second transition criterion. Thus, the surface flow transition position of the Mars entering device can be predicted via the method.

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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