蒸汽辅助涡轮对增压汽油机瞬态响应特性影响的模拟

为改善废气涡轮增压汽油机加速工况时的瞬态响应特性,提出了蒸汽辅助涡轮增压的方法.基于一款废气涡轮增压汽油机,采用GT-Power软件分别建立并标定了蒸汽辅助涡轮增压与废气涡轮增压的仿真模型.针对该汽油机的常用转速2000r/min,研究了各种蒸汽参数对增压系统及汽油机性能的影响.结果表明,在2000r/min时的加速工况,蒸汽辅助涡轮能使汽油机加速迟滞时间缩短48.0%,加速扭矩提升9.7%.因此,蒸汽辅助涡轮能有效改善增压汽油机的加速性和动力性.

A Simulation Study on the Effects of Steam Assisting Turbo on the Transient Response of Turbocharged Gasoline Engine

To improve the transient response of exhaust turbocharging engine under accelerated conditions, a method of steam-assisted turbocharging was proposed. Based on an exhaust turbocharged gasoline engine, the simulation models of steam-assisted turbocharging and exhaust turbocharging engine were established and then calibrated by the software of GT-Power. On this basis, the effect of various steam parameters on the performances of turbocharging system and the gasoline engine was studied at the engine speed of 2000 r/min. The results show that, at the accelerated condition of 2000 r/min, the retarded time of the gasoline engine can be reduced by 48.0% and the peak torque can be increased by 9.7% through steam-assisted turbocharging. As a result, the acceleration and dynamic performance of the gasoline engine can be effectively improved by steam-assisted turbocharging.