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Study of Spray and Combustion Using Fast Response Common Rail Injector with Micro Orifice Nozzle

Article of Honda R&D Technical Review Vol.27 No.2

Summary

Reduction of the nozzle hole diameter was investigated with the aim of further reducing harmful exhaust emissions from diesel engines. This investigation used a prototype injector with an injection rate gradient at the start of fuel injection that is approximately 80% greater than that of a conventional mass-production injector. Three types of nozzles were prepared that have the same hydraulic flow rate and only different numbers of holes and hole diameters from 0.08 mm to 0.12 mm. Spray measurement results confirmed that as the hole diameter becomes smaller, the spray penetration drops and the droplet Sauter mean diameter also becomes smaller. In addition, the results of engine combustion tests showed that reducing the nozzle hole diameter and increasing the number of holes increased the rich portion of the air-fuel mixture, so this does not contribute to the reduction of harmful exhaust emissions.

Reference

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Author (organization or company)

Akira KATO(Automobile R&D Center)、Katsuya MATSUURA(Automobile R&D Center)、Yasuhiro YOSHIMI(Automobile R&D Center)

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