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Wang S.-M.,Shanghai JiaoTong University | Zhu J.,Shanghai JiaoTong University | Deng K.-Y.,Shanghai JiaoTong University | Cui Y.,Shanghai JiaoTong University | And 3 more authors.
Neiranji Gongcheng/Chinese Internal Combustion Engine Engineering | Year: 2011

In order to ensure the marine diesel engine has high performance at both high and low loads, a newly designed variable geometry exhaust manifold (VGEM) turbocharging system was put forward. The VGEM turbocharging system can realize switching between two charging modes by a controllable valve installed on the exhaust manifold. The one-dimensional steady simulation of VGEM turbocharging system was performed for an eight-cylinder marine diesel engine by using GT-POWER. According to the BSFC optimization the switching point is found to be at 50% load point. And then the simulations of the four-pulse, PC, MPC, and MIXPC turbocharging systems were conducted respectively for the diesel engine. The simulation results indicate that at all four loads of 25%, 50%, 75%, 100%, the BSFC of the VGEM turbocharging system is always less than that of the four pulse, MPC, MIXPC turbocharging systems, and its average scavenging coefficient is always greater than that of other three systems.

Wang S.-M.,Shanghai JiaoTong University | Rong W.-H.,Zibo Diesel Engine Parent Company | Lu J.-H.,Zibo Diesel Engine Parent Company | Deng K.-Y.,Shanghai JiaoTong University | And 2 more authors.
Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | Year: 2011

Variable geometry exhaust manifold (VGEM) turbocharging system can realize the switching between two charging modes by using of controllable valve. It gives good performance at both high speed operation and low speed operation of marine diesel engine. In this paper, the simulated experiments on the VGEM turbocharging system was performed, and analysis on experimental results of the VGEM and MIXPC turbocharging systems was presented. Experimental results show that the switching point of the VGEM turbocharging system at 85% load. The temperature before turbine is decreased. BSFC of the VGEM turbocharging system reduces by 18 g/(kW · h) at 25% load. BSFC of the VGEM turbocharging system gives the same value to that of the MIXPC turbocharging system at full load.

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