| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Outline of Final Research Achievements |
Bio-gas produced through low and high temperature gasification was applied to a spark-ignition engines. A diesel based engine with higher turbulence and higher compression ratio gave the indicated thermal efficiency of about 40%. Actual bio-gas was also used to a gas engine. It gave the maximum brake thermal efficiency of 30% in the case of low-temperature gasification, while in high-temperature gasification, it goes down to 22 %. Over-expansion effect in a homogeneous compression ignition mode was also examined and gave the maximum indicated efficiency of 45% with no NOx emission. Direct-injection of gaseous fuelwas experimentally examined by using a rapid compression machine where engine-like condition was safely reproduced. A model was successfully established on the basis of comparison between emissions data obtained by completely uniform mixture combustion. The non-uniformity was reasonably expressed by the mean equivalence ratio and the dispersion of Gaussian distribution.
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