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基于Navier-Stokes方程组对某型涡扇发动机波瓣强迫混合排气系统进行了数值模拟,获得了波瓣长度以及扩张角分别不变时,不同穿透率模型的流场、涡量场的变化规律,揭示了通过不同方法改变穿透率对强迫排气系统混合性能的影响。模拟结果表明,在排气系统出口处,当瓣长一定时,热混合效率随穿透率的增加先增加而后逐渐趋于不变,当波瓣扩张角不变时,热混合效率随穿透率的增加而增加;总压恢复系数和推力系数随穿透率的增加均不断降低。
Based on the Navier-Stokes equations, a forced mixed exhaust system of a turbofan engine was numerically simulated. The results of flow field and vorticity field in different permeability models were obtained when the length of the lobe and the expansion angle were respectively unchanged The variation rule reveals the influence of different penetration rates on the mixing performance of forced exhaust system. The simulation results show that at the outlet of the exhaust system, when the valve length is constant, the thermal efficiency increases first and then becomes constant with the increase of the penetration rate. When the angle of expansion of the lobe is constant, the efficiency of thermal mixing increases with penetration The rate of increase and increase; total pressure recovery coefficient and thrust coefficient with the increase of penetration rate are decreasing.