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TitleJun Yu, Jukwang Lee, Choongsik Bae, "Dimethyl ether (DME) Spray Characteristics in Common-Rail High Pressure Injection Equipment," Paper No. 2002-VT-10, Proc. 14th ISAF (International Symposium on Alcohol Fuels, Phuket, Nov. 2002.

Jun Yu, Jukwang Lee, Choongsik Bae, “Dimethyl ether (DME) Spray Characteristics in Common-Rail High Pressure Injection Equipment,” Paper No. 2002-VT-10, Proc. 14th ISAF (International Symposium on Alcohol Fuels, Phuket, Nov. 2002.

Abstract

Dimethyl Ether (DME) has been considered one of the most attractive fuels for compression ignition engine. Its main advantage in compression-ignition engine application is high efficiency of diesel cycle with soot free combustion though conventional fuel injection system has to be modified due to the intrinsic properties of the DME. Experimental study of the DME and conventional diesel spray employing a common-rail type fuel injection system with a sac type injector was performed in a constant volume vessel pressurized by nitrogen gas. A CCD camera was employed to capture time series of Mie-scattered spray images, so that spray cone angles and penetrations of the DME spray were characterized and compared with those of diesel. For evaluation of the evaporation characteristics, shadowgraphy employing an Ar-ion laser and an ICCD camera was adopted, in conjunction with Mie-scattered single hole spray imaging technique. Tip of the DME spray was formed in mushroom like shape at atmospheric condition, which disappeared in higher chamber pressure. On the contrary, spray characteristics of the DME became similar to diesel under higher ambient pressure, 3MPa in this study. Evaporating spray characteristics of the DME was investigated with different injection pressures in the atmospheric and 3 MPa chamber pressure conditions. Higher injection pressure produced wider vapor phase area while it decreased with higher chamber pressure condition.

PreviousJun Yu, Jookwang Lee and Choongsik Bae, “Dimethyl Ether (DME) Spray Characteristics Compared to Diesel in a Common-Rail Fuel Injection system,” SAE 2002-01-2898, SAE 2002 Powertrain & Fluid Systems Conference, San Diego, Oct. 2002.
NextDong-Seok Choi,Yongseok Lee, Jaejoon Choi and Choongsik Bae, “Characterisation of Mixture Distribution in a DISI Optical Engine under Late Injection Mode,”Proc. 1st International Conference on Optical and Laser Diagnostics (ICOLAD2002), pp71-76, Institute of Physics, London, Dec. 2002.

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