Performance optimization of a marine auxiliary generator
In order to reduce the fuel consumption of an marine auxiliary engine,the optimal valve timing,compression ratio and plunger speed are determined by simulation analysis.Through the load characteristic test and the orthogonal test,the best injector scheme is determined,and the suitable oil pump and sea water pump are selected through the hot idle test.The fuel consumption before and after optimization is compared by bench load test.The results show that after optimization,the crankshaft angle corresponding to the intake closing is 565°,the crankshaft angle corresponding to the exhaust opening is 135°,the compression ratio is 15.5,and the maximum plunger speed is increased to 2.54 m/s,the injector with a hole diameter of 0.32 mm and a hole cone angle of 158° is selected,the volume flow rate of oil pump and sea water pump is reduced by 10 and 15 m3/h respectively.The fuel consumption rate is decreased by 4-5 g/(kW·h)compared with the original one in the common working condition,which achieve the goal of reducing fuel consumption.
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