涡轮增压氢发动机加速特性的分析和改进

Simulation analysis and improvement of the transient performance of a turbocharged hydrogen engine

发动机废气驱动涡轮增压器可以提高发动机的升功率 ,而涡轮增压器突然加速的响应滞后为增压氢发动机用于车辆牵引产生了特有的困难。该文研究了发动机瞬态特性的相关问题 ,如调速器特性、喷氢装置特性、发动机和增压器的速度变化 ,涡轮增压器的工况迁移和参数的变化等。研究表明 ,涡轮当量通流面积的变化对发动机的过渡特性影响不大 。

The engine's exhaust gas which can propel the vanes of a turbocharger raises the engine's power output. A turbocharger's response lag brings about special difficulties to the turbocharged hydrogen engines in the vehicle trailing. This paper investigates the problems related to the engine's transient processes: the governor's dynamic properties, the hydrogen injection's performance, speed changes of the engine and the turbocharger, the moving of the working condition and coefficients of the turbocharger. Variation of the turbine's equivalent flow area has little effect on the engine's transient performance. Proper reducing of turbine's momentum and charging air to accelerate the turbine will improve the engine's acceleration property.