限制域对中心分级燃烧室出口温度分布的影响

Effect of Confinement on Exit Temperature Distribution of Centrally Staged Combustor

为了研究中心分级燃烧室的气动热力特性以及火焰筒限制域对出口温度分布的影响,在三头部燃烧室中进行了流场、油雾场、组分场测试,并在高温高压下测量了不同火焰筒限制域的出口温度。实验结果显示,限制域的缩短会增加出口热斑面积和OTDF。借助数值模拟得出限制域减小使已燃回流产物的稀释作用减弱,预燃级附近产生更高的局部高温。同时其更短的停留时间和较弱的掺混,综合导致了该方案出口温度分布不均匀,使HAR以及OTDF增加。

In order to investigate the thermodynamic characteristics of central staged combustors and effect of confinement on exit temperature distribution,flow field,spray and species were measured in tri-sector combustor.In addition,exit temperature distribution of different confinements were investigated under elevated pressures and temperatures.The experimental results show that the reduction of the confinement dimensions will increase the exit hot streak area and OTDF.Through numerical simulation,it is found that the dilution effect of burned product decreases,leading to a stronger high temperature zone.Meanwhile,shorter residence time and weaker dilution will all worsen the temperature distribution at the combustor exit,leading to larger hot streak area and OTDF.