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研究了燃烧室几何形状对直喷式柴油机缸内气体流动和性能的影响 .用多维模型计算了三种不同几何形状的燃烧室内气体流动状况 ,系统分析了燃烧室内紊流、挤流以及湍流动能随时间和空间的分布 ,优化了燃烧室几何形状并在一台单缸柴油机上对优化的燃烧室进行了试验研究 .结果表明 ,优化后的燃烧室内气体运动强烈 ,湍流动能在较大的空间时间范围内维持高水平 .通过适当减小供油提前角 ,采用优化后燃烧室的柴油机预混合燃烧减少 ,扩散燃烧加强 ,取得了低NOx、碳烟、CO、HC排放以及低燃油消耗率的效果
The effects of combustion chamber geometry on the gas flow and performance of direct injection diesel engine were studied.The gas flow in three different geometric shapes of combustion chamber was calculated by multi-dimensional model, and the turbulence, squish flow and turbulent kinetic energy With the distribution of time and space, the geometry of the combustion chamber is optimized and an optimized combustion chamber is tested on a single cylinder diesel engine.The results show that the optimized combustion chamber has strong gas movement and turbulent kinetic energy in a large space Maintain the high level in the time range.Due to the appropriate reduction of fuel supply advance angle, pre-combustion of diesel engine with optimized combustion chamber is reduced, diffusion combustion is strengthened, and low NOx, soot, CO, HC emissions and low fuel consumption effect