Visual Study of Diffusion Process of Impinging Spray in Stratified Charge Engine Using Liquid-Liquid Injection Technique 912457
In order to clarify a diffusion process of impinging spray on a direct fuel injection in a stratified charge engine, visual observation was made on the diffusion processes of fuel after impingement, by using a liquid-liquid injection technique by means of a single shot photography. Furthermore, the performance of actual engine adopted a impinging diffusion method was examined by using a small direct injection(D.I.) diesel engine. In this technique, the liquid fuel was injected into a plastic piston cavity which was filled with water to simulate the diffusion process of fuel after impinging against a cylindrical target vertically provided at the center of the piston cavity. The impinging spray radially diffused from the target center and formed a torus, which was viewed from the bottom and the side. The results suggest that a practical application of stratified charge engine to the small D.I. diesel engine with twin valves and an inclined injection nozzle is possible by making the end surface of target incline.
International Pacific Conference On Automotive Engineering