燃料燃烧所产生的热量转化为有效功的百分数称为有效热效率，记作ηe。
高负荷时发动机有效热效率增加而CO排放基本相当。
However, the brake thermal efficiency increases and the CO emissions almost equal at high loads.
在负荷特性工况运行时，混合燃料发动机的有效燃料消耗率和有效热效率与汽油机基本相当；
Under the load characteristic of operation, the brake specific fuel consumption and effective thermal efficiency is almost similar to that of gasoline engine.
同时分析了提高压缩比并掺水蒸气后有效热效率提高的主要来源是燃料—空气理想循环热效率的提高。
Concurrently analyzed is that improvement of effective thermal efficiency after rise in compression ratio and water injection is resulted from thermal efficiency promotion of fuel-air ideal cycle.
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