Affiliation:
1. Department of Mechanical Engineering, University College Dublin, Belfield, Dublin 4, Ireland
Abstract
This paper describes an attempt to separate out and to quantify the relative importance of fuel injection characteristics and in-cylinder air motion as factors influencing the rate of fuel-air mixing and of combustion in high-speed D.I. diesel engines, where bulk swirling air motion is absent. Tests on a 121 mm bore × 139 mm stroke, 1.6 liter, single-cylinder engine at constant engine speed reveal substantially shorter fuel-air mixing times as the mean fuel injection kinetic energy (M.I.K.E.) is increased. Also, tests at constant injection kinetic energy but with varying engine speed (involving different fuel injection system builds at each speed) show that fuel-air mixing times are reduced at higher engine speeds. From these trends it is concluded that, while injection kinetic energy is the dominant factor in determining fuel-air mixing rates in D.I. diesels, small-scale turbulent air motions, the intensity and structure of which are related to engine speed, also exert an important influence on the mixing rate.
Subject
Mechanical Engineering,Energy Engineering and Power Technology,Aerospace Engineering,Fuel Technology,Nuclear Energy and Engineering
Reference40 articles.
1. Arcoumanis, C., and Whitelaw, J. H., 1987, “Fluid Mechanics of Internal Combustion-Engines—a Review,” Proc. Inst. Mech. Engrs., Vol. 201, No. C1.
2. Ball
W. F.
, 1981, “Einflusse des Einspritzdruckes auf die Verbrennung bei Dieselmotoren mit Direkteinspritzung ohne Luftdroll,” MTZ, Vol. 42, No. 4, pp. 141–149.
3. Ball, W. F., and Timoney, D. J., 1981, “The Performance of a Quiescent Direct Injection Diesel Combustion System and Its Comparison With Prediction,” Presented at CIMAC, Helsinki, 8–12 June.
4. Bazari, Z., 1992, “A DI Diesel Combustion and Emissions Predictive Capability for Use in Cycle Simulation,” SAE Paper No. 920462.
5. Beck et al., 1988, “Effects of Fuel Injection on Diesel Combustion,” SAE Paper No. 880299.
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献