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以柯特略尔法为例，对在级叠加式涡轮特性计算时使用逆算法的适用性进行了讨论。证明了末级首先临界的假定在各折合级设计压比相同的条件下可自然满足；当各折合级设计压比不全相同时，给出了寻找首先临界级的判据，并提出采用顺逆结合处理临界问题的方法，突破了末级首先临界的简化假定，优化了计算步骤，提高了估算精度。
Taking the example of the Kohutul method, the applicability of using inverse algorithm in the calculation of superposition turbine performance is discussed. It is proved that the assumption of the first threshold of the last stage can be satisfied naturally under the same design pressure ratio of each equivalent design level. When the design pressure ratios are not all the same, the criterion of finding the first critical level is given, Combined with the method of dealing with the critical problem, the simplification assumptions of the first critical stage at the last stage are broken through, the calculation steps are optimized, and the estimation accuracy is improved.