某船用发电辅机性能优化

刘锦荣¹，范希聪¹，和晓锋¹，王佳伦¹，张智勇¹，白书战²

1.重庆潍柴发动机有限公司技术中心，重庆   402262；2.山东大学能源与动力工程学院，山东 济南   250061

摘要：为降低某船用发电辅机常用工况油耗，采用仿真分析确定最佳配气相位、压缩比、柱塞速度；通过负荷特性试验及正交试验，确定最佳喷油器方案；通过热怠速试验选择合适的机油泵、海水泵；通过台架负荷特性试验对比发电辅机优化前、后的油耗。结果表明：该发电辅机优化后，进气关闭角对应的曲轴转角为565°，排气开启角对应的曲轴转角为135°，压缩比为15.5，最高柱塞速度提高至2.54 m/s，选用喷孔直径为0.32 mm、喷孔锥角为158°的喷油器，机油泵、海水泵体积流量分别降低10、15 m³/h，辅机常用工况区油耗比原机下降4~5 g/（kW·h），达到降低油耗的目的。

关键词：船用发电辅机；油耗；配气相位优化；喷油器选型

Performance optimization of a marine auxiliary generator

LIU Jinrong¹, FAN Xicong¹, HE Xiaofeng¹, WANG Jialun¹,ZHANG Zhiyong¹, BAI Shuzhan²

1.Technology Center, Chongqing Weichai Engine Co., Ltd., Chongqing 402262, China;

2.School of Energy and Power Engineering, Shandong University, Jinan 250061, China

Abstract：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.

Keywords: marine auxiliary generator; fuel consumption rate; valve timing optimization; fuel injector selection