Diesel engine combustion is a heterogeneous process. What are the benefits gained if any if we use a multiple hole injector instead of a single hole one for the same engine.
One of the reason could be better spray dispersion due to large spray cone angle achieved due to the increase in the number of injector holes. As the bore diameter of CI engines is quite large, the spray needs to be very well dispersed for uniform mixture formation.
You can refer the following research for a better insight
Efficient mixing of fuel & air is critical in any engine in order to obtain optimum power and fuel consumption. When using multi-hole over single-hole injectors in a diesel engine it it possible to employ smaller holes and this results in superior atomisation of the fuel and more thorough fuel/air mixing thereby generating greater efficiency.
At least in direct injection CI engines, you get the injected droplets burning. Smaller droplets from multiple bores of smaller diameter result in a better combustion.
The larger spray cone is another aspect - distributing the droplets more evenly in the volume thus resulting in a more uniform combustion.
Yes John smaller droplets will evaporate faster but they won't travel( penetrate deeper into the chamber to find the air as large droplets in the absence of swirl what do you think?
@ Kamal
Regarding droplet travel etc.: multi hole injectors came with increasing pressures, thus it may be even. And I guess tody's systems are designed to have quite some swirl. Introduced at the transition from pre-chamber injection to direct injection.
Optimization is reaely a single-feature approach. Even when starting as such, most times it turns out that you have to implement additional things to make the first appoach working well.
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