Hydraulic and rotor-dynamic interaction for performance evaluation on a Francis turbine

Abstract

Usability is a fundamental quality characteristic for the success of an interactive system. It is a concept that includes a set of metrics and methods in order to obtain easy-to-learn and easy-to-use systems. Usability Evaluation Methods, UEM, are quite diverse; their application depends on variables such as costs, time availability, and human resources. A large number of UEM can be employed to assess interactive software systems, but questions arise when deciding which method and/or combination of methods gives more (relevant) information. We propose Collaborative Usability Evaluation Methods, CUEM, following the principles defined by the Collaboration Engineering. This paper analyzes a set of CUEM conducted on different interactive software systems. It proposes combinations of CUEM that provide more complete and comprehensive information about the usability of interactive software systems than those evaluation methods conducted independently.

Numerical Investigation of a High-Speed Electrical Submersible Pump with Different End Clearances

“…The solid model of impeller and diffuser are shown in Figure 2. on the other hydraulic machines, including Francis turbine [36][37][38], water turbine [39], and tidal turbine [40]. At present, there are relatively few studies on the influence of end clearance on the performance of ESP.…”

“…They found that k-ε and k-ω are most suitable for internal flow and performance prediction. Furthermore, as a powerful simulation method, CFD approach was applied on the other hydraulic machines, including Francis turbine [36][37][38], water turbine [39], and tidal turbine [40].…”