逆算法对涡轮特性柯特略尔估算的改进

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。

An Improvement on Kotlial Prediction of Turbine Performance by the Use of an Inverse Computation Method

Taking Kotlial method as an example,this paper discusses the applicability of an inverse computation method for the calculation of stage superimposed type turbine performance.It has been proved that the last stage first stagnation hypothesis can be naturally fulfilled under the condition of identical design pressure ratio for each corrected stage. In case of the design pressure ratio for each corrected stage not identical given are ascertainment criteria for finding the first stagnant stage.In addition,the use of a combined sequential inverse computation method is proposed for the treatment of critical issues,thus making a breakthrough regarding the last stage first stage hypothesis.Computation procedures have been optimized,resulting in an enhancement in evaluation precision.