TY - JOUR
TI - Optimization of volumetric efficiency of a small wankel engine using genetic algorithm
AU - Zhang Yan
AU - Liu Jinxiang
AU - Zuo Zhengxing
AU - Zhang Shuai
JN - Thermal Science
PY - 2020
VL - 24
IS - 1
SP - 101
EP - 111
PT - Article
AB - In this work, port crank angles strategies for maximizing engine volumetric efficiency of a commercial rotary engine are studied. The internal combustion engines computer program, which simulates an actual working processes, has been used. Overall performance characteristics such as the cycle efficiency, engine power are calculated by a mathematical model. The model is calibrated with data obtain from a measured in-cylinder pressure, and validated against the experimental data. In-take opening and closing time, exhaust opening and closing time are chosen as optimization variables when volumetric efficiency was taken as the objective function. First, the intake opening time is the only optimization variable and it can be found that intake opening time is in advance as engine speed is increased. Second, four variables including intake opening and closing, exhaust opening and closing have been taken as the optimization variables, a further increase in volumetric efficiency was obtained, with the highest gain being of 1.03% at 17000 rpm. But opening the exhaust opening very late will reduce the power.