Effects of Pilot Fuel Ratio on Combustion Process:Flow Field Structure and Pollutant Emissions

作     者：ZONG Chao JI Chenzhen CHENG Jiaying ZHU Tong ZONG Chao;JI Chenzhen;CHENG Jiaving;ZHU Tong

作者机构：Postdoctoral Station of Mechanical EngineeringTongji UniversityShanghai201804China School of Mechanical EngineeringTongji UniversityShanghai201804China 

出 版 物：《Journal of Thermal Science》 (热科学学报（英文版）)

年 卷 期：2023年第32卷第6期

页      面：2321-2335页

核心收录：

学科分类：080702[工学-热能工程] 08[工学] 0807[工学-动力工程及工程热物理] 0703[理学-化学] 

基　　金：supported by the Science and Technology Commission of Shanghai Municipality(20dz1204902). 

主　　题：micro gas turbine pilot fuel ratio flow field structure carbon monoxide nitrogen oxide 

摘      要：As the only controllable means of a micro gas turbine(MGT)combustor during unit operation,pilot fuel ratio(PFR)is the key to achieving stable combustion and low pollutant emission.This paper discusses the influence of PFR on the inner flow field structure and pollutant emissions.The steady-state three-dimensional RANS method with a 40-step reduced methane-air kinetics mechanism is used to study the reaction flow field and species field with PFR of 9.0%,12.7%,15.2%and 17.6%.Results show that,with the decrease in PFR,the axial velocity and temperature near the central axis of the combustion chamber show a tendency to decrease.A similar separation phenomenon occurred in the core pyrolysis reaction zone(measured by HCO)and oxidation zone(measured by OH),which is more conducive to promoting the oxidation of CO.The quantitative effect of the pilot flame on nitrogen oxides(NO_(x))was separated by using inert gas instead of nitrogen in combustion air.It was found that the NOx produced by the pilot flame under the operation condition with a PFR of 9.0%was 3.2×10^(−6),accounting for 17.4%of the total NOx emission,which was twice that of PFR.