1. Key Laboratory of Hydraulic Machinery Transients, Ministry of Education, Wuhan University, Hubei, P.R. China;
2. Hubei Key Laboratory of Waterjet Theory and New Technology, Wuhan University, P.R. China;
3. School of Power and Mechanical Engineering, Wuhan University, Hubei, P.R. China;
4. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao, Shandong, P.R. China