| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
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| Outline of Final Research Achievements |
The aim of the present study is to improve combustion characteristics of a dual fuel diesel engine. In this investigation, natural gas (CNG) is supplied to an intake-pipe and the ignition fuel is injected into the combustion chamber. The experiments used coconut oil methyl ester (CME) and JIS No. 2 diesel fuel as the ignition fuel, and a technique combining cooled EGR and supercharging was employed. The results showed that the trade-off relation between the NOx and smoke emissions improved remarkably without worsening the brake thermal efficiency at a condition of 40% CNG supply, 120 kPa boost pressure, and 26% EGR (17% oxygen concentration in the intake air). The smoke reductions with CME were better than with diesel fuel.
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