Abstract
In order to study the characteristics of diesel spray impinging in small-size internal combustion (IC) engine, the laboratorial platform of spray impingement is used to visualize the droplet impact phenomenon. A high-speed camera is used to record the whole process of the spray. An experimental research is accomplished under the impingement phenomenon of diesel spray on the wall with a fixed injection volume of 25 mg, injection pressure of 40 MPa, wall-injector distance of 40mm and orifice diameter of 0.26 mm. The computational fluid dynamics (CFD) simulation is carried out and the turbulence kinetic energy (TKE) distribution diagram is obtained. The results show that the maximum spray radius is 29.3 mm and maximum spray height is 10.2 mm at 2.8 ms. The spray impingement phenomenon presents the “blanket” shape. The simulation results are similar to the experimental results with the average error of the spray height within 3%.
Highlights
Light weight, high thermal efficiency, wide power range and compact structure is the characteristic of diesel engine
The volume of the diesel engine has been reduced gradually in recent years, resulting in the spray penetration was short and the phenomenon of diesel spray came into collision with piston or cylinder wall occurring during fuel injection
It is significant to study the phenomenon of spray impingement on diesel engine [1,2,3,4,5]
Summary
High thermal efficiency, wide power range and compact structure is the characteristic of diesel engine. Sci. 2018, 8, 384 experiments, went into the effects of ambient density, injection pressure and impact angle on the flow characteristics of8,impinging diesel spray They concluded that the average peak velocity was 2positively. R. payri et al [11] studied the effect of nozzle inclination went the effects ofand ambient density,that injection pressure and of impact angleconducted on sprayexperiments, characteristics byinto experiments concluded the lower angle inletangle hole was on the flow characteristics of impinging diesel spray. They concluded that the average peak velocity on favorable for faster jet penetration. Spray impingement is analyzed and the accuracy of the simulation is proved
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