可控涡结构的三维湍流燃烧特性的数值分析

Numerical Simulation of Turbulent Combustion Characteristics in the Vortex Controlled Diffuser

可控涡扩压器因具有较高的压力恢复及较低的压力损失而得到重视,为了获得其较好的燃烧性能,采用有限速率模型及引气口流量出口条件对可控涡结构的燃烧特性进行了数值模拟,并和无引气的常规突扩结构的燃烧流场进行了比较。结果表明:可控涡结构的引入能够减小燃烧室回流区长度,有利于突扩燃烧室组织燃烧,扩大燃烧通道中的燃烧区域,并使出口截面温度沿径向分布更加均匀以及燃烧效率得到较大提高,其性能比无引气的常规突扩结构更好。

The vortex controlled diffuser( VCD) has been expected to be widely used in the engine combustion chamber in the future,due to its high pressure recovery and low pressure loss.To obtain satisfactory vortex controlled diffuser performance,numerical simulations of flow in different structures were performed with finite rate model and suction slot bleed condition.Comparison was made between VCD and normal expansion structure without suction slot.It is revealed that this structure with suction slot canreduce the length of the recirculation zone in combustion chamber,expand the combustion area,make the distribution of the outlet temperature along the radial direction more uniform,and improve the combustion efficiency greatly.