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对适用于高度为10~20km的中速、低速多用途飞行器的双级涡轮增压活塞发动机螺旋桨推进系统的特性计算方法进行了研究.引用涡轮发动机的部件法,建立基于各部件特性的代数数学模型,推进系统各部件工作点则由Newton法求解系统联合工作方程组得到.给出了方程组中的活塞发动机功率保持工作条件及增压器与活塞发动机联合工作条件,分析了推进系统功率保持工况和减功率工况的调节规律,及其对涡轮增压器工作线的影响.分析了推进系统总体及各部件的高度-速度特性.研究表明:该特性计算方法收敛快,一个工况点一般迭代5~6次即可;两个燃气旁通阀的调节规律不但可以满足推进系统的设计目标,同时还可对增压器工作点进行有效的优化调节;该特性计算方法可直接推广到更复杂的多级涡轮增压系统中.
The calculation method of propeller propulsion system for two-stage turbocharged piston engine applied to mid-speed and low-speed multipurpose vehicle with height of 10 ~ 20km is studied.Considering the component method of turbine engine, algebraic mathematics The operating points of the model and propulsion system components are obtained by the Newton’s method of solving the system of combined equations of work.The power conditions of the piston engine in the system and the working conditions of supercharger and piston engine are given.The power conservation of the propulsion system Condition and reducing power condition and its influence on turbocharger working line.The height-velocity characteristics of the propulsion system as a whole and its components are analyzed.The results show that the method of calculating this characteristic converges fast and a working condition The general regulation of the two gas bypass valves can not only meet the design goals of the propulsion system, but also can effectively optimize the turbocharger operating point. The calculation method of this characteristic can be directly extended To more complex multi-stage turbocharging systems.