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Investigation of the unstable flow phenomenon in a pump turbine

Science China(Physics,Mechanics & Astronomy) 2014年第6期57卷 1119-1127页

作者： YIN JunLian WANG DeZhong WALTERS D.Keith WEI XianZhu School of Mechanical Engineering Shanghai Jiaotong University Department of Mechanical Engineering Mississippi State University State Key Laboratory of Hydropower Equipment

Instability of pump turbine with S-shaped curve is characterized by large fluctuations of rotational speed during the transient *** investigating this phenomenon,a numerical model based on the dynamic sliding mesh method(DSSM)is presented and used to numerically solve the 3D transient flow which is characterized by the variable rotation speed of *** method is validated by comparison with measured data for a load rejection process in a prototype pump *** results show that the calculated rotation speed agrees well with the experimental *** on the validated model,simulations were performed for the runaway process using an artificially assumed operating condition under which the unstable rotation speed is expected to *** results confirm that the instability of runner rotational speed can be effectively captured with the proposed *** results include the time history profiles of unit flow rate and unit rotating *** internal flow characteristics in a typical unstable period are discussed in detail and the mechanism of the unstable hydraulic phenomenon is ***,the results suggest that the method presented here can be a viable alternative to predict the dynamic characteristics of pump turbines during transient processes.

关键词： pump turbine transient process dynamic sliding mesh flow stability

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