Computational Method for Open Degree Characteristics of Radial Direction Variable Geometry Swirl

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.