| COOLING EFFECT OF METHANOL ON AN N-HEPTANE HCCI ENGINE USING A DUAL FUEL SYSTEM |
| B. THANAPIYAWANIT, J.-H. LU |
| National ChungHsing University |
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| ABSTRACT |
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Homogeneous charge compression ignition (HCCI) engines have the potential to raise the efficiency of reciprocating engines during partial load operation. However, the performance of the HCCI engine at high loads is restricted by severe knocking, which can be observed by the excessive pressure rise rate. This is due to the rapid combustion process occurring inside the cylinder, which does not follow the flame propagation that is seen in conventional engines. In this study, a low compression ratio of 9.5:1 for a gasoline engine was converted to operate in HCCI mode with the goal being to expand the stable operating region at high loads. Initially, pure n-heptane was used as the fuel at equivalence ratios of 0.30 to 0.58 with elevated intake charge temperatures of 180 and 90 |
| Key Words:
HCCI, Dual fuel system, N-heptane, Methanol |
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