对置活塞式双动力输出柴油机燃烧特性试验研究

Experimental Study on Combustion Characteristics of Opposed Piston Diesel Engine with Mechanical-Hydraulic Hybrid Power Output

建立了对置活塞式机械-液压双动力输出柴油机试验台,通过试验测试该柴油机在机械输出和液压输出条件下的示功图,并计算瞬时放热率,研究对置活塞式柴油机输出不同能量形式时的燃烧特性,将测试结果与输出机械功的传统对置活塞柴油机的燃烧特性进行了对比。研究结果表明:对置活塞式机械-液压双动力柴油机在输出液压功时负荷的增加对缓燃期和后燃期影响更大,并使放热率重心后移。与传统对置活塞柴油机相比,相同工况时液压输出负载的柴油机速燃期放热速率更快,后燃持续期更长。

A test bench for an opposed piston diesel engine with mechanical-hydraulic hybrid power output is established. Heat release rates of the engine are calculated by its indicator diagrams measured from experiments with mechanical and hydraulic energy output modes, and its combustion characteristics with these two modes of energy output are investigated. Comparison of the combustion characteristics of such engine with those of a traditional opposed-piston engine shows that with hydraulic mode, the increase of load has a greater influence on slow combustion period and after combustion period, and it delays the center of heat release rate as well. Besides, the hybrid engine with hydraulic mode has a faster heat release rate in rapid combustion period and a longer after combustion duration compared with a traditional opposed-piston engine.