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在汽轮机能量平衡方程的基础上，对汽轮机相对内效率与理想循环热效率的概念进行了讨论，指出汽轮机采用回热循环或中间再热后，其相对内效率与理想循环热效率间存在较强的耦合性。最后，建议汽轮机热力试验中应该对回热系统运行条件等对汽轮机相对内效率的影响进行修正。
Based on the energy balance equation of steam turbine, the concept of relative internal efficiency and ideal circulating thermal efficiency of steam turbine is discussed. It is pointed out that there is a strong coupling between the relative internal efficiency and the ideal thermal efficiency of the steam turbine after it is regenerated or reheated Sex. Finally, it is suggested that the influence of the operating conditions of the recuperation system on the relative internal efficiency of the steam turbine should be corrected in the steam turbine thermal test.