3th WCSET-2014 at Nepal

 

Special Session at Ho Chi Minh City University of Technology, Vietnam:

Title:            Effects of High Power and Thermal Efficiency on Lean Limit in Direct Injection Natural Gas Fueled Spark Ignition Engine
Authors:       Tran Dang Quoc
Abstract:      This article represents two technical methods to estimate the extension of lean limit for direct injection natural gas fueled spark ignition engine. The first method is increasing compression ratio in part load, in which the thermal efficiency and the turbulence intensity near the top dead centre are enhanced simultaneously. On the contrary, the increase of boost pressure by supercharging is not only enhanced supply energy but also increased the turbulence intensity at the beginning of the compression process. The obtained results indicated that, the high power has effectively extended the lean limit in comparison with high efficiency only. This effectiveness is proved by the difference in two lean limits of λ = 1.41 and λ = 1.49 when compression ratio and boost pressure increase respectively.

Keywords:   Boost pressure, Supercharging, Lean limit, Direct injection, Compression ratio, Squish, Turbulence intensity, Swirl velocity, Combustion chamber geometry.
Pages:         661-665

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