基于遗传-支持向量机的对置活塞二冲程柴油机气口高度优化

以某对置活塞二冲程柴油机为研究对象,基于一维仿真模型,利用遗传-支持向量机的方法,以油耗为优化目标,进行不同转速工况下进排气口高度组合的自动化寻优。结果表明:在1200r/min下,优化的进、排气口无量纲化高度组合为［0.075,0.105］,所得最小油耗为220.32g/(kW·h);对置活塞二冲程柴油机的气口最优高度应随着转速的提高逐渐增大;且在高转速(大于1600r/min)下,排气口最优高度增加趋势更加明显。 

Optimization of port height of opposed-piston two-stroke diesel engine based on GA-SVM

Taking fuel consumption as the optimization goal, the automatic optimization of the intake and exhaust port height of an opposed-piston two-stroke diesel engine prototype for various engine speeds was simulated experimentally by using the genetic-support vector machine method on the basis of one-dimensional simulation model. The results showed that under the low engine speed such as 1200r/min, the combination of optimized dimensionless intake and exhaust ports height was［0.075, 0.105］, and the minimum fuel consumption was 220.32g/(kW·h). For the opposed-piston two-stroke diesel engine, the optimized port height for either intake port or exhaust port monotonically increased with the increasing engine speed. Exhaust port height increased more obviously than that of intake port for optimized port height under high engine speed (engine speed was greater than 1600r/min).