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本文分析了转桨式水轮机的静特性和动特性特点,计入动态力矩的附加分量、导叶到转轮的流动滞后和管道惯性时间常数(含有流动修正系数x)。因为导水机构位于压力流道的中部且作为水锤界面,故又引入了装置水头升高平均值的概念。还给出了数字例,用频率法验证系统的稳定性。对具有纯滞后的系统,计算所得系统的实际滞后时间τ若小于理论分析得出的临界滞后时间τ_(0c),则系统的稳定是保证的。讨论了具有协联装置的双调整调速器在增减负荷时应采取的调节策略问题。最后,提出有待研究的几点建议和某些结论。
This paper analyzes the static and dynamic characteristics of a Kaplan turbine, including the additional components of dynamic torque, the flow lag of the guide vane to the runner and the inertia time constant of the pipeline (including the flow correction factor x). Because the water guide mechanism is located in the middle of the pressure channel and acts as a water hammer interface, the concept of average head lift is introduced. Also given a number of examples, the use of frequency method to verify the stability of the system. For a system with pure hysteresis, if the actual lag time τ of the system is smaller than the critical lag time τ_ (0c) obtained from theoretical analysis, then the stability of the system is guaranteed. The adjustment tactics to be adopted in the double-adjustment governor with associated devices during load increase and decrease are discussed. Finally, some suggestions and some conclusions to be studied are put forward.