Parameterization modeling method for fusion design of diffuser and outlet guide vane

Abstract

The invention provides a parameterization modeling method for the fusion design of a diffuser and an outlet guide vane. The parameterization modeling method for the fusion design of the diffuser and the outlet guide vane is characterized by comprising the following steps of: 1, determining center line and thickness distribution of a runner of a last-stage rotor, and center line and thickness distributions of an inlet and an outlet of the runner with a fusion structure; 2, selecting control points of splines with the fusion structures as control parameters; 3, determining the variable control parameter in the control parameters according to constraint conditions; 4, setting the variable control parameter, and determining a parameterization model for the corresponding runner with the fusion structure. According to the parameterization modeling method for the fusion design of the diffuser and the outlet guide vane, the parameter of the runner of an OGV / diffuser can be rapidly obtained, a design scheme can be rapidly estimated, and design efficiency is effectively improved.

Description

technical field [0001] The invention belongs to the field of aero-engines, in particular to a parametric modeling method for the fusion structure design of a diffuser and an outlet guide vane. Background technique [0002] The continuous improvement of technical indicators of large civil airliners puts forward very high requirements for civil aeroengines. Low noise, low pollution, low fuel consumption, low cost, long life, high reliability and high safety are the basic characteristics of modern civil aviation engines. Among them, indicators such as low pollution emissions, low fuel consumption, long life, and high reliability pose new technical challenges to the design of engine combustion chambers. Most modern aero-engines use high-load compressors with high Mach numbers at the outlet, so that the velocity head of the compressor outlet section can reach 10% of the total pressure. The diffuser converts most of the energy into static pressure and forms a stable and symmetri...

AI Technical Summary

Problems solved by technology

The OGV airflow turning angle can generally reach 45°. High load will inevitably lead to a large total pressure loss and corner separation of the OGV.

If the fusion design is adopted, the length of the prediffuser can be effectively reduced, but the reverse pressure gradient in the flow channel will inevitably increase, and the OGV load will also increase, which will make the end wall and OGV boundary layer thicker and the wake wider, making The design of OGV is more difficult

The severe flow separation of OGV is not conducive to the performance and stability of the high-pressure compressor, and will also seriously affect the mixing and diffusion process of the wake in the diffuser

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