V型高速发动机进气均匀性仿真

Simulation of Intake Uniformity of V-type High Speed Engine

基于计算流体力学(computational fluid dynamics,CFD)三维计算分析方法,研究V型高速机A/B两排进气管进气均匀性。设计4种不同结构的进气管,并进行均匀性仿真分析,结果表明:采用平行进气式,A/B两排速度均匀性随负荷降低而逐渐递增;采用由上往下进气式,A排速度均匀性逐渐递增,而受管内气体旋转流动的影响,B排均匀性呈现先下降后上升的趋势;采用圆管式三通腔的均匀性优于扁方式;平行进气式导流板会对进气均匀性产生不利的影响。不同工况下的最优方案不同,需根据高速发动机的每个工况来选择最佳的进气管结构。

Based on the three‑dimensional computational analysis method of computational fluid dynamics(CFD),the intake uniformity of the A/B rows of intake pipes in a V‑type high‑speed engine was studied.Four kinds of intake pipes with different structures were designed and uniformity simulation analysis was conducted.The results show that:Using parallel intaking,the velocity uniformity of A/B rows gradually increases with the decrease of load;Using top‑down intaking,the uniformity of velocity in row A gradually increases;However,due to the influence of the rotational flow of gas inside the pipe,the uniformity in row B decreases first and then increases;The uniformity of circular three‑way cavity is better than that of flat cavity;The installation of parallel intaking deflectors can have adverse effects on the uniformity of intaking.The optimal solution varies under different operating conditions,and the optimal intake pipe structure should be selected based on each operating condition of the high‑speed engine.