Two internal irreversibility parameters, the heat engine cycle and the refrigerator cycle were introduced to characterize the irreversibility inside the cycle.

引入两个内不可逆性参数，分别用于描述热机循环的内不可逆性和制冷循环的内不可逆性。

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The heat transfer characteristics of the detonation chambers outer and inner wall were analyzed when the pulse detonation engine model was operated in the multi-cycle mode.

分析了两相多循环脉冲爆震发动机工作过程中爆震室内、外壁换热特性，建立了爆震室壁温分布计算模型。

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In order to approach the carnot efficiency the processes involved in the heat engine cycle must be reversible and involve no change in entropy.

为了接近卡诺效率，所涉及的过程，在热机循环必须可逆且涉及没有改变熵。

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It expands. You change your constraints on your system, you heat it up some more, then you take the heat source away, and you put it back in contact with the atmosphere. And you cool it a little bit, change the constraints, cool it a little bit more, and heat, and you've got a closed cycle engine.

让它与大气接触冷却,改变约束，使它继续冷却，然后又再次加热,这就是循环热机，我们以前也研究过，更复杂的机器。

麻省理工公开课 - 热力学与动力学课程节选