Cross flow transition experimental data expansion technology based on stability method

Abstract

The invention relates to a transition experiment data expansion technology, and discloses a cross flow transition experimental data expansion technology based on a stability method. The method comprises the steps: employing stability analysis means with reliable theoretical support to analyze existing wind tunnel experiment and flight test data; according to incoming flow parameters or physical property parameters such as incoming flow Reynolds number, attack angle and surface roughness which have significant influence on the cross flow transition position, changing the parameters in a range suitable for a stability theory, and obtaining a theoretical solution of the cross flow transition position, so continuation of experimental data is realized. Compared with a flight test and a wind tunnel test, the method has the characteristics of low cost, easiness in implementation and high reliability, is used for supplementing and expanding experimental data, and makes up the defects of high cost, long period and high difficulty of direct data supplementation at present.

Description

Technical field [0001] The present invention relates to the technical field of transition experimental data expansion, in particular to a cross-current transition experimental data expansion technique based on a stability method. Background technique [0002] When the fluid flows around the solid, the area where the fluid and the solid interact is concentrated in a thinner area around the solid wall, which is called the boundary layer. The boundary layer has two kinds of flow regimes: laminar flow and turbulent flow. These two flow regimes have huge differences in the aerodynamic force and aerodynamic heat distribution that act on the wall of the flowing object. The state difference is an important engineering factor that must be considered. The process of changing from laminar flow to turbulent flow is called transition. If the transition can be accurately predicted, the difference between laminar and turbulent states in the flow field can be determined. Therefore, transition p...

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Problems solved by technology

[0006] Aiming at the high cost and difficulty of existing cross-flow transition wind tunnel experiments and flight tests, the present invention proposes a data expansion technology for cross-flow transition experiments based on a stability method. Compared with flight tests and wind tunnel experiments, this technology has It has the characteristics of low cost, easy implementation and high reliability. As a supplement and expansion of experimental data, it makes up for the high cost and period of direct supplementary data (directly using wind tunnel experiments and flight tests to supplement experimental data). Disadvantages of length and difficulty

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