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http://dx.doi.org/10.3795/KSME-B.2014.38.10.837

Study of Combustion Characteristics with Compression Ratio Change in Ultra-Lean LPG Direct Injection Engine  

Cho, See Hyeon (Dept. of Mechanical Engineering, Gachon Univ.)
Yoon, Jun Kyu (Dept. of Mechanical Engineering, Gachon Univ.)
Park, Cheol Woong (Environment and Energy Systems Research Division, Korea Institute of Machinery and Materials)
Oh, Seung Mook (Environment and Energy Systems Research Division, Korea Institute of Machinery and Materials)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.38, no.10, 2014 , pp. 837-844 More about this Journal
Abstract
Automotive manufacturers have recently developed various technologies for improving fuel economy and satisfying enhanced emission regulations. The ultra-lean direct injection engine is a promising technology because it has the advantage of improving thermal efficiency through the deliberate control of ignition. A conventional LPG engine has been redesigned to an ultra-lean-burn LPG direct injection engine in order to adopt combustion system of ultra-lean-burn. This study is aimed at investigating the effect of a change in the compression ratio on the performance and emission characteristics of a lean-burn LPG engine. The fuel consumption, heat release rate, combustion pressure, and emission characteristics are estimated depending on changing the effect of compression ratio. When the compression ratio is increased, it is difficult to improve the fuel consumption owing to an unstable combustion state, but the total hydrocarbon and nitrogen oxide emissions are reduced.
Keywords
LPG Direct Injection; Ultra Lean Combustion; Spray-Guided Type Combustion System; Brake Specific Fuel Consumption; Combustion Stability;
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Times Cited By KSCI : 2  (Citation Analysis)
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