A Quantitative Analysis Method for the Self-sustaining Capability of the Separation Zone in the Non-starting State of the Super Inlet

Abstract

The invention discloses a quantitative analysis method for the self-sustaining capacity of a non-starting state separation zone of a hypersonic inlet. The quantitative analysis method for the self-sustaining capacity of the non-starting state separation zone of the hypersonic inlet comprises the following specific steps that step 1, according to an analysis result of an aerodynamic theoretical model, a self-sustaining index SI of the separation zone is proposed; step 2, the self-sustaining index Si in a self-sustaining state of the separation zone in the starting process of the inlet is calculated by using the formula 1.1; and step 3, the obtained Si value is used for quantitatively analyzing the self-sustaining capability of the non-starting state separation zone of the hypersonic inlet in different non-starting states during the star process. The problem of identifying and judging the instability critical state of the separation zone under the condition of real viscosity is solved byproposing a dynamic quantitative evaluation parameter of the self-sustaining index of the separation zone.

Description

technical field [0001] The invention belongs to the technical field of flow mechanism analysis during the start-up process of a hypersonic inlet, and specifically relates to a quantitative analysis method for the self-sustaining ability of a separation zone in a non-starting state of a hypersonic inlet. Background technique [0002] The hypersonic inlet is a key component of the scramjet engine. Its main function is to provide continuous, stable, and high-quality pressurized air to the combustion chamber to ensure smooth ignition and combustion in the combustion chamber, and the entire engine produces positive thrust. Only when the hypersonic inlet is activated, the scramjet can work normally according to the design requirements. Regardless of the configuration of the intake port, the common feature in the inactive state is the flow separation zone near the inlet of the inner constriction. During the whole start-up process of the large-scale separation area in the inlet, it...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a quantitative analysis method for the self-sustaining ability of the separation zone in the non-starting state of the high-speed intake port, and provides a parameter and its calculation formula for quantitatively evaluating the self-sustaining capacity of the separation zone during the start-up process of the intake port——separation Zone self-sustainability index, which solves the problem that existing analysis methods are difficult to identify and judge the critical state of instability in the separation zone under real viscous flow conditions

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