The effect of TDC temperature and density on the liquid-phase fuel penetration in a D.I. Diesel engine

摘要: A parametric study of the liquid-phase fuel penetration evaporating Diesel jets has been conducted in a directinjection engine using laser elastic-scatter imaging. The experiments were an optically accessible ``heavy-duty`` size class at representative medium speed (1200 rpm) operating condition. density and temperature TDC varied systematically by adjusting intake pressure. At all conditions measurements show that initially liquid penetrates almost linearly with increasing crank angle until reaching maximum length. Then, liquid-fuel length remains fairly constant although injection continues. 16.6 kg/m{sup 3} about 1000 K is approximately 23 mm. However, it varies significantly as are changed, liquid-length being less higher temperatures densities. corresponding apparent heat release rate plots presented results discussed respect to ignition delay premixed bum fraction.