Performance Optimization on Hydrogen Engine in Passenger-car/LCV

Authors

S. Jian, G. Dingwei, L. Haipeng, C. Zhijun, M. Deyong, Z. Zhiyong - Great Wall Motor

Summary

A hydrogen engine, with compression ratio ε 10.5/12, torque 230Nm@5000rpm ~302/285Nm @ 2000Nm, brake thermal efficiency η = 39.1/39.8%, is restructured based on 2.0L gasoline engine. Due to the limitation of burst pressure (Pmax), which is designed at the boundary of no more than 120bar, the performance is restricted, which is manifested in two aspects. First, the external characteristics is narrowed by the delayed ignition angle, so as to limit the increase of power density. Second, the retarded ignition angle affects the performance at the best fuel consumption point, including the highest load, the ratio due to friction, and the increasing of the compression ratio. What mentioned above weakens both the best fuel consumption point and the external characteristics. In order to achieve higher performance, on the basis of the hydrogen prototype engine, it is planned to raise the burst pressure boundary and optimize the combustion system by simulation method, mainly aiming at the nozzle and intake port.
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