基于旋流分离器结构的冷壁燃烧室流动特性仿真

Simulation of Cold-wall Combustion Chamber Flow Characteristics Based on Cyclone Separator

旋流分离器产生的内外双层旋流具有稳定火焰以及冷却壁面的潜能,为此文中应用雷诺应力模型(RSM)对某种结构的旋流冷壁燃烧室的流动特性进行了数值仿真。结果表明:旋流冷壁燃烧室能够实现内外双层旋流流动,具有较好的壁面冷却效果。冷热态条件下,总压损失系数为0.9%和1%,表现出低阻特性;内外旋流分界面平均约占半径的70%。燃烧区域分界随燃料喷入速度的增大而增大,燃料喷射速度为12 m/s时,燃烧区域最大,平均约占半径的56%。

Inner and outer swirl produced by cyclone separator have the potential of stabilizing flame and cooling wall , therefore, in this pa-per, RSM model was used to simulate flow characteristics of a swirl-cooled combustion chamber .The results show that swirl-cooled com-bustion chamber can achieve inner and outer swirl flow , and has good cooling effect of the wall .Under cold and hot conditions , the total pressure loss coefficient is 0.9%and 1%, showing low resistance characteristics of the structure , the average boundary of inner and outer swirl is 70%of the swirl radius .The boundary of combustion increases with the increase of fuel injection rate .The combustion zone is big-gest when fuel injection rate is 12 m/s, the average is 56%of the radius.