重型柴油机涡轮复合增压技术的研究与应用

Research and application of the turbo-compound technology on a heavy duty diesel engine

研究了动力涡轮与曲轴之间的传动比对柴油机动力性和经济性的影响,以便将带可变截面增压器(VGT)的涡轮复合系统应用于重型柴油机上。构建了一维模型,以便模拟涡轮复合增压发动机,并优化动力涡轮和涡轮增压器与发动机的匹配。在某一台常规11 L的重型柴油机的基础上,研制了涡轮复合柴油机试验样机,并进行试验,以研究增压器开度对柴油机性能的影响,并寻求最优控制策略。结果表明:该涡轮复合增压发动机的全工况外特性优于原机,比油耗(BSFC)平均改善3%,最大改善8%。这表明:涡轮复合增压是一项能够满足未来柴油机节能减排要求的关键技术。

The effect of transmission ratio between power turbine and diesel engine crank power on the performances and the fuel economy was investigated for the application of turbo-compound system with Variable Geometry Turbocharger （VGT） on a heavy duty diesel engine. A one-dimensional model was established to simulate the turbo-compound engine and optimize the matching of the power turbine and turbocharger with the engine. A turbo-compound prototype diesel engine was developed based on a conventional 11-L heavy-duty diesel engine, and then tested to investigate the impacts of the openness of the VGT on the turbo-compound engine performances, and to ifne the most optimal control strategy. The results show that the turbo-compound engine is better than the original machine under engine ful load operation conditions. The brake speciifc fuel consumption （BSFC） increases 3% on average with a maximum BSFC of 8%. Therefore, turbo-compounding is a key technology to satisfy the future requirements of diesel engine’s energy conservation and emission reduction.