论文部分内容阅读
在保证波瓣强迫混合排气系统内外涵流道面积不变的情况下,建立了某型涡扇发动机不同波瓣高宽比波瓣强迫混合排气系统的几何模型,基于Navier-Stokes方程进行了数值模拟研究,得到了波瓣强迫混合排气系统中,在涵道比和内外涵面积不变的条件下,波瓣高宽比对波瓣强迫混合排气系统的流场、热混合效率、总压恢复系数和推力系数的影响规律.结果表明:当涵道比不变时,在波瓣高宽比为2～4.5的变化范围内,在排气系统出口处,混合效率随波瓣高宽比的增加呈现出增大-减小-增大的趋势,其中波瓣高宽比为3和3.21分别为曲线的两个拐点.而随着波瓣高宽比的增加,总压恢复系数、推力系数均不断减小.
Under the condition that the area of outer and inner culverts in the forced exhaust system of forced lobe is unchanged, the geometrical model of the forced mixed exhaust system with lobe aspect ratio lobe of a certain turbofan engine is established. Based on the Navier-Stokes equation Numerical simulations were carried out to find that the lobe aspect ratio of the forced mixed exhaust system of lobe forced to flow in the forced forced exhaust system of the lobe under the condition of constant bypass area and inner and outer culverts, , The total pressure recovery coefficient and the thrust coefficient.The results show that when the bypass ratio is constant, the efficiency of the mixing increases with the lobe size when the lobe aspect ratio is in the range of 2 ~ 4.5, The aspect ratio increases with increasing - decreasing - increasing trend, in which the aspect ratio of lobes is 3 and 3.21 are the two inflection points of the curve, respectively.With the increase of lobe aspect ratio, total pressure recovery Coefficient, thrust coefficient are decreasing.