Characterization of premixed swirling methane/air diffusion flame through filtered Rayleigh scattering  

作　　者：Meng Li Bo Yan Shuang Chen Li Chen Jin-He Mu 李猛;闫博;陈爽;陈力;母金河(State Key Laboratory of Aerodynamics China Aerodynamics Research and Development Center,Mianyang 621000 China;Science and Technology on Scramjet Laboratory National University of Defense Technology,Changsha 410073,China)

机构地区：[1]State Key Laboratory of Aerodynamics China Aerodynamics Research and Development Center,Mianyang 621000 China [2]Science and Technology on Scramjet Laboratory National University of Defense Technology,Changsha 410073,China

出　　处：《Chinese Physics B》2022年第3期375-381,共7页中国物理B（英文版）

基　　金：Project supported by National Science and Technology Major Projects of China (Grant No. J2019-V-005-0096)。

摘　　要：Characteristics of a premixed, swirl methane/air diffusion flame at atmospheric pressure are measured by filtered Rayleigh scattering(FRS). Three operating conditions are investigated with the equivalence ratios of the methane/air flame covering a range of 0.67–0.83. Under each condition, single-shot and averaged FRS images over a region measured 39.3×65.6 mm^(2) at seven cross sections of the flame are collected to demonstrate the flame behavior. A gradient calculation algorithm is applied to identify reaction zone locations and structures in the instantaneous FRS measurements.Statistical analysis for the mean FRS measurements is performed by means of joint probability density functions. The experimental results indicate that thermochemical state of the swirl flame is strongly influenced by equivalence ratio, leading to varieties of flame structures and temperature distributions. The gradient of the instantaneous FRS images clearly illustrates the characteristics of the reaction zone. The results also demonstrate that FRS can provide detailed insights into the behavior of turbulent flames.

关 键 词：filtered Rayleigh scattering equivalence ratio swirl flame temperature measurement 

分 类 号：TK16[动力工程及工程热物理—热能工程]