A Design Method for Axisymmetric Precompressed Precursor with Boundary Layer Displacement

Abstract

The invention provides a method for designing axial-symmetry pre-compression fore bodies with boundary layer displacing functions. The method includes designing pressure controllable flow fields; designing aircraft pre-compression fore bodies on the basis of the pressure controllable flow fields, to be more specific, designing a fore body wall surface related to a half of each symmetry plane as the aircraft pre-compression fore bodies on the basis of the pressure controllable flow fields are symmetric, and then carrying out symmetry transformation to obtain complete pre-compression fore body profiles. The pressure controllable flow fields are outer rotary axial-symmetry pressure controllable flow fields, and each pressure controllable flow field comprises a direct excitation wave-dependentflow field and a main compression flow field which are combined with each other to form the pressure controllable flow field. The method has the advantages that the pre-compression fore bodies are integrally designed, the compressibility, the boundary layer displacement properties and the airflow full capture of the fore bodies can be taken into consideration, and the design efficiency can be improved.

Description

technical field [0001] The invention relates to super / hypersonic aircraft, in particular to an axisymmetric pre-compression precursor design method based on pressure-controllable boundary layer displacement capability in the integrated design of hypersonic aircraft inlet / precursor. Background technique [0002] Achieving higher speed flight has always been the goal pursued by human beings, and it is also a realistic demand to meet the national aerospace strategy and enhance national defense strength. As the main power system of super / hypersonic aircraft, ramjet has superior performance in flight due to its simple structure and high specific impulse. At present, its research has become a technological frontier for various countries to compete for. The ramjet engine uses the oxygen in the atmosphere to organize combustion without carrying an oxidant itself, so it has good economy. As the air intake device of the ramjet engine, the function of the intake port and the precurso...

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Problems solved by technology

[0006] At present, there is no relevant research on the boundary layer displacement in the literature on the integrated design of the axisymmetric inlet / precursor for shock sealing; the existing bulge inlet designs mostly focus on the ability of the bulge to remove the boundary layer According to the research, the currently designed bulge configuration is shorter than the length of the aircraft precursor, which will generate shock waves and cause additional total pressure loss

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