Investigation on Effect of Offset Orifice Nozzle on Diesel Combustion Characteristics Tokyo Institute of Technology

Format:

Book

Conference/Event

Author/Creator:

Ewphun, Pop-Paul, author.

Contributor:

Kosaka, Hidenori

Nagasawa, Tsuyoshi

Sato, Susumu

Conference Name:

SAE Powertrains, Fuels & Lubricants Meeting (2020-09-22 : Krakow, Poland)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2020

Summary:

Compression ignition provides superior thermal efficiency than other internal combustion engine. Unfortunately the combustion process is diffusive combustion, a lot of fuel were impinged on pistion and cylinder wall. This create cooling loss couple with smoke, CO and THC. Minimization of the nozzle orifice diameter is simple method that widely used to shorten spray penetration. However this also decreases fuel flow rate resulted in prolonged injection process and made worst efficiency. Offset orifice nozzle grants less fuel impinged by shorter spray penetration without reduction of fuel flow rate. The offset orifice nozzle made by shift nozzle orifice alignment from the center to edge of sac for swirl direction. Counter bore design was applied to keep constant orifice length. This paper investigates the effects of nozzle orifice position on combustion characteristics under various injection pressures and oxygen concentrations. The experiments were carried out on single cylinder engine. The engine was installed with standard nozzle or offset orifice nozzle. The experiments were divided into single pulse and multi pulses injection. The single pulse injection experiment was conducted in order to clarify the effect of nozzle orifice position on combustion characteristics. The multi pulses injection condition was used to simulate the actual engine operating regarding to single pulse injection experimental results. The results showed offset orifice nozzle provides higher gross ITE compare to standard design nozzle under every test conditions. However the increasing gross ITE from applied offset orifice nozzle is diminish when injection amount increase. Other benefit of offset orifice nozzle is noticeable lower CO and THC. On the other hand large amount of smoke emission were produce by offset orifice nozzle under single pulse injection with large injection amount and low oxygen concentration. This issue can be solved by separate fuel injection into small pulses and increase injection pressure

Notes:

Vendor supplied data

Publisher Number:

2020-01-2038

Access Restriction:

Restricted for use by site license