Investigation On Technology Of Regulating Outlet Temperature Field Of High Temperature Rise Combustors With Dilution Holes

Based on the new type of high temperature rise combustor, A CFD parametric study wasperformed to analyze the exit temperature distribution of combustor by changing mixing holescharacteristic. Simplified mixing model of back flow combustor and direct combustor was established.The influence of structure parameters and aerodynamic parameters of the mixing hole on the exittemperature distribution of combustor was investigated. Flow characteristic and aerodynamicsperformance in mixing zone were studied. Some result was verified in the single dome combustornumerical simulation and the influence of pollutant emission characteristics by mixing zonetemperature distribution was study. Some results of the study were obtained. The study results are asfollows:(1) Simplified mixing model of back flow combustor were established. The influence ofchanging mixing holes characteristic on the exit temperature distribution of combustor was obtained.When the mass ratio of mixing air was constant, the number、diameter and configuration of themixing holes plays an important role in the penetration and the exit temperature distribution. Researchresults show that: When the mass ratio and the structure were constant, the number、diameter andconfiguration of the mixing holes exist an optimum figure. Mixing holes shape was important to thepenetration characteristic and the temperature distribution of the outlet. A half flanging hole mixing jetpenetration was deeper than the flanging hole mixing jet, and the jet flanging hole mixing jetpenetration was deeper than the horizontal hole. The RTDF and OTDF of flanging holes had anchange for the better relative to the horizontal hole. But the OTDF increase and the RTDF reduce inhalf flanging hole.(2) Simplified mixing model of direct flow combustion were established. Different mixing holescharacteristic were explored for the non uniform mainstream temperature. When the outer mixing jet Jis35.5and the inner mixing jet J is54.4, the best inner and outer mixing holes S/H are respectively0.65and0.84. When the structure was constant, the penetrations get deeper as the Momentum-Fluxratio get higher. When the Momentum-Flux ratio increased to a certain value, the mixing jetpenetration depth increase, but the temperature distribution of outlet will not be obvious improvement.In this paper, the value would be77.(3) The influence of structure parameters and aerodynamic parameters of the mixing hole on theexit temperature distribution of combustor was investigated in the single dome. The pollutant emission characteristics of the outlet were studied.The results of study are important to further investigate the key technology of the control of thetemperature distribution of the exit in the high temperature rise combustor and to supply thetheoretical basis and technical support.