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Liu J.-P.,Hunan University | Xia X.-L.,Hunan University | Zhao Z.-C.,Hunan University | Zhan Z.-S.,Institute of Powertrain Engineering | And 2 more authors.
Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | Year: 2012

The parameters influencing the thermal-power conversion efficiency was analyzed based on the measured values of heat release rate and thermal efficiency. Some incomplete or incorrect conclusions are pointed out and the possible reasons are analyzed. It is not always true that large effective expansion ratio results in high indicated thermal efficiency. Similarly, it is not always true that the centre position of heat release curve should be as close to the TDC as possible. Also it is demonstrated that single characteristic parameters such as 50% burning position and peak pressure position, are not unique and may have multiply solutions when determining the highest thermal efficiency. Among those, the effective expansion ratio is identified as the most reasonable parameter.

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