Effects of Tabular Stratified CO_(2)/O_(2)Jets on Dynamic and NO_(x)Emission Characteristics of a Model Gas Turbine Combustor  

作　　者：TAO Chengfei ZHOU Hao 

机构地区：[1]Institute for Thermal Power Engineering,Zhejiang University,State Key Laboratory of Clean Energy Utilization,Hangzhou 310027,China

出　　处：《Journal of Thermal Science》2021年第4期1160-1173,共14页热科学学报（英文版）

基　　金：supported by The National Science Fund for Distinguished Young Scholars(51825605)。

摘　　要：The effects of tabular stratified CO_(2)/O_(2)jet in cross flow on thermoacoustic instability and NO_(x)emission were experimentally studied.To explore the dependence of injection positions on flame stability,two factors were taken:the injection height and the injection direction of CO_(2)/O_(2)gas.Results show that the injection positions seriously affect the control effectiveness.The optimum acoustic amplitude-damped ratio of thermoacoustic instability can reach 76.61%with the first layer of horizontal direction.The sound pressure amplitude declined from 56 Pa to 13.1 Pa.The concentration-damped ratio of NO_(x)emission can achieve 66.67%with the first layer of vertical direction.The concentration of NO_(x)emission declined from 50.4 mg/m^(3)to 16.8mg/m^(3)as the jet in cross flow rate increased.Higher oxygen ratio of stratified CO_(2)/O_(2)jets can produce lower NO_(x)emission but higher combustion instability.The descending gradient of NO_(x)emissions is different among different injection positions.Frequency shifting of the sound pressure and flame CH*chemiluminescence emerged.The oscillation frequency declined as the flow rate of CO_(2)/O_(2)jets increased.The unsteady long and compact flame was dispersed after CO_(2)/O_(2)injection.The macrostructure of flame was characterized as flatter and short under jet in cross flow.The variation curves of the flame length and top view area are similar to the shape of half saddle lines.This research proved the optimal control of thermoacoustic instability and NO_(x)emissions with a passive method,which could be conducive to the realization of clean and secure combustion in industrial lean premixed combustors.

关 键 词：CO_(2)/O_(2) combustion instability jet in cross flow NO_(x)emission tabular injector 

分 类 号：X701[环境科学与工程—环境工程]