驻涡燃烧室前钝体燃料喷射性能数值分析

为研究驻涡燃烧室在前钝体燃料喷射状况下的燃烧性能，采用3维数值仿真模拟方法，对驻涡燃烧室前钝体燃料喷射 状况下的燃烧效率及燃烧室性能与无前钝体燃料喷射状况下的燃烧性能进行了对比分析，并对驻涡燃烧室的冷流以及燃烧状态 下的燃烧室性能进行了系统研究。燃烧室温度分布表明：前钝体顶部燃料喷射在0.2~0.7的喷射系数范围内，缩短了燃烧室火焰 长度，提高了燃烧室在相同轴向长度下的燃烧效率，使燃烧室更加紧凑；驻涡燃烧室前钝体顶部燃料喷射孔的孔径在一定范围内 的变化对燃烧室的燃烧效率、出口温度分布系数以及总压损失影响较小。

Numerical Analysis of Trapped Vortex Combustor Performance Under Front Bluff Body Fuel Injection

In order to study the combustion performance of a trapped vortex combustor (TVC) under the condition of front bluff body fu- el injection, comparative analyses were conducted on the combustion efficiency and the combustion performance of the TVC under condi- tions with and without front bluff body fuel injection using three-dimensional numerical simulation. The TVC performances under non-re- acting and reacting flow were systematically examined. The results of combustor temperature distribution show that the fuel injection from the top of the front bluff body with an injection coefficient in the range of 0.2-0.7 leads to a decreased flame length in the combustion cham- ber, improves the combustion efficiency at the same axial length of the combustion chamber and makes combustion chamber more compact. The variation of the diameter of the fuel injection orifice at the top of the front bluff body of the TVC within a certain range has little influ- ence on combustion efficiency, outlet temperature distribution coefficient, and total pressure loss of the combustion chamber.