The Research On The Flow Field Characteristics Of Center Classification Combustor

Aero-engines, as the power plants of spacecraft instrumentation, directly influence the stability of planes. With the development of science and technology, the pressure and temperature in the combustor of aero-engines increase constantly. So the combustor needs to be operated stably in a wider range. The swirler has great impact on the working performance of combustors. Therefore, reasonably designed swirlers can improve the whole performance of aero-engine combustors.This paper, referring to the designing scheme of center classification swirlers, designs some center classification swirlers with different swirling number of main combustion stage and precombustion stage and center classification combustors with different structure parameter. Choosing one center classification combustor as standard combustor, this paper decides the appropriate turbulence model through using four different turbulence models to do analog computation and decides the tracer particle through using four different tracer particles to do PIV test; then this paper does analog computation and PIV test of center classification combustor with some different parameters by the using decided turbulence model and tracer particle and does research on the flow field characteristics in the combustor.Research result shows: through theoretical calculation and PIV test, tracer particles can well show the characteristics of head flow field of the center classification combustors,explain the simplification of mathematical modeling and show the following features of head flow field combustors; the paper gets velocity vector diagrams of flow field through respectively using four turbulence models to make numerical calculation on the center classification swirler combustors and makes comparison with PIV test result, therefore, the numerical calculation result of Realizable k-? model is more reasonable; through the numerical calculation of center classification combustors, the paper gets the result that the length and diameter of flame tubes and the changes of structure parameters of main combustion stage influence the performance of swirlers, while the influence of structureparameters of precombustion stage is not obvious. This paper can provide a basis for the design optimization of center classification swirlers.