Test Study on Characteristics of Multi-Hole Injector for Gasoline Direct Injection Engine

Abstract

By means of High speed camera and CCD camera, combining with high energy laser device, spray characteristics test of multi-hole injector for gasoline direct injection engine have been done on the constant volume chamber bench. The variation laws of spray penetration, spray angle and spray target were studied under different injection pressures, different injection pulses and different injection background pressures. Also the variation tendency for spray penetration of different injector flow ranges have been tested and analyzed. The results indicate that injecting pressure boosting can strengthen the initial penetration developing of spray plume, fuel atomizing becoming better, resulting in increasing of spray angle. The effects of changing background pressure on spray angle and target are not obvious. And spray target coordinate is mainly determined by the injector hole layout. Under the same injection pressure and flow quantity, injector having the larger flow range has shorter penetration than that of smaller flow range.