燃油脉动对温度场影响的数值研究

Numerical Simulation for Influences of Fuel Injection Pulse on Temperature Profile

为了研究燃油脉动对燃烧室温度场的影响,分别对燃油脉动在均匀进口、径向速度畸变进口和周向速度畸变进口中进行了瞬态模拟,分析了燃油脉动在不同进口速度流场中对燃烧室温度场的影响。结果表明:燃烧室出口温度参数随燃油脉动变化呈现出相似的变化规律,但这种响应具有一定的滞后性;燃油脉动造成主燃孔区域燃烧不合理,使得主燃孔截面温度品质降低,出口径向温度分布系数FRTDF产生波动;燃油脉动和进口速度畸变不仅改变了燃烧室出口温度在径向和周向的分布,而且会使在叶尖和叶根处存在高温区,降低涡轮强度;燃油脉动在径向畸变进口中的影响程度最大。

In order to investigate the influences of fuel injection pulse on combustor outlet temperature profile, the transient simulations of fuel injection pulse in couple homogeneous inlet, radial distortions and circumferential distortions were performed. The influences of fuel injection pulse on the combustor outlet temperature profile with different inlet flow field were analyzed. The results show that the combustor outlet temperature parameters change with the variation of the fuel injection pulse, but the phenomenon usually lags behind the fuel injection pulse. The fuel injection pulses cause unreasonable combustion in the primary hole region, and lower the quality of temperature, specially deteriorate radial temperature distribution factor. The fuel pulses and the inlet velocity distortions not only change the distribution of combustor outlet temperature profile in radial and circumference, but also bring the high-temperature zone in the root and tip of the turbine blades, which have influences on turbine strength. The most strong influences of the fuel pulse are in the radial distortions inlet.