【摘 要】
：
In the recent year,the diesel fuel have been injected with high pressure to promote the atomization of the fuel,and downsizing concept has been applied to the engines for improvement thermal efficienc
【机 构】
：
Faculty of mechanical Science and Technology Gunma University,Japan
【出 处】
：
13th International Conference on Liquid Atomization and Spra
论文部分内容阅读
In the recent year,the diesel fuel have been injected with high pressure to promote the atomization of the fuel,and downsizing concept has been applied to the engines for improvement thermal efficiency.Moreover,ambient gas density in the combustion chamber tends to increase to apply exhaust gas recirculation(EGR)system.Applications of those strategies might resulted in impingement of the diesel spray to the cavity wall of the engine.The impingement of the diesel spray shows negative effect on emission characteristics of the diesel exhaust such as soot and unburned hydrocarbon(UHC).Therefore,prediction for spray tip penetration of the diesel spray is important to consider design of a combustion chamber in the engine.Empirical formula proposed by Hiroyasu-Arai have been used to predict the spray tip penetration,and the formula have been applied to numerical simulation of the diesel spray.In this study,feasibility of the empirical formula was investigated under high injection pressure and high ambient gas density conditions.Diesel fuel was injected into a high pressure vessel with the common rail system at room temperature.Shadow image technique was applied to evaluate the spray tip penetration under various injection pressure and ambient gas density conditions.As the results,it was found that there was discrepancy for the spray tip penetrations between the empirical formula and the experimental results.The velocity coefficient and the experimental coefficient were estimated from the experimental results,and those coefficients could showed the dependence on ambient gas density,even though those coefficients in the formula were constant.As the result,the spray tip penetration predicted by the empirical formula modified with those coefficients got closer to the penetration obtained with the experimental results than that predicted with Hiroyasu-Arai formula.
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