径向式可变几何旋流器开度特性计算方法
Computational Method for Open Degree Characteristics of Radial Direction Variable Geometry Swirl
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摘要: 介绍了径向式可变几何旋流器开度特性计算方法,随着航空发动机推重比(p/w)的不断提高,涡轮前温度在逐年提高,目前先进发动机涡轮前温度高达1800K。燃烧室工作油气比(F/A)将由0.02增至0.03,为了保证发动机燃烧室在较宽的工作油气比范围内具有最佳性能,采用径向式可变几何旋流器是有效技术途径之一,本文从数学关系上建立了该种旋流器开度特性的计算方法并给出算例。可供可变几何燃烧室设计参考。Abstract: The paper describes a computational method for open degree characteristics of radial direction variable geometry swirl.With the increase of aero-engine's propulsive-weight ratio (p/w),the temperature ahead of turbine has increased yearly. Now this temperature of advanced engine is as high as 1800 K and at the same time the fuel-air ratio (F/A) of combustion chamber increases up to 0.03 from 0.02.To ensure the best combustion performance when the chamber works in wide range of F/A,one of the effective technical approaches is to adopt variable geometry swirl.In this paper a mathematical relationship for the open degree characteristics of the swirl is formulated and examples are presented.All these can be used as reference to the combustion chamber designs.
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