发动机滚流比分析与研究

Analysis and Research on Engine Tumble Ratio

通过对比3种滚流比状态下的性能数据,研究滚流比对PFI发动机性能影响的规律。通过对比不同滚流比下的油耗、扭矩、排放数据可知,增大滚流比可以改善发动机中高负荷的燃烧速度;高滚流比明显增加了低速段外特性扭矩,同时可以降低中高负荷油耗率,相应THC排放也有所降低;对于滚流比较小的PFI发动机,可以适当加大滚流比以提高性能及降低油耗。

By comparing performance data under three tumble ratios, this paper compares the influence rule of tumble ratio on PFI engine performance. We know by comparing fuel consumption, torque and emission that a higher tumble ratio can improve combustion velocity at the mid-to-high load area. And higher tumble ratio can obviously increase the external characteristic torque at low speed, and it can also decrease the fuel consumption and THC emission at the mid- to-high load area. Increasing tumble ratio appropriately is good for PFI engine to improve engine performance and reduce fuel consumption.