Abstract
In non-design conditions, severe hydraulic instability can affect the stability of a pump station and even shorten its service life. A Francis pump station in the South-to-North Water Transfer Project was examined to carry out a numerical simulation of the entire flow passage using a bidirectional fluid–solid method for static and fatigue life. Due to the inlet setting, reverse power generation exhibited a more distorted flow pattern that resulted in higher energy loss than the pump condition. The radial force acting on the blades in reverse power generation was 39.1% higher. Runner stress was mainly concentrated at the leading edge and blade edge. The maximum stress in reverse power generation was 35.7 MPa, which was about 28.5% higher than in the pump condition. While the maximum deformation was 0.035 mm, almost 94.4% more severe than in the pump condition, mainly concentrated at the leading edge. Based on the fatigue analysis, a minimum safety factor obtained numerically was 8.238 in the pump condition and 6.343 in the reverse power condition, respectively. The safety factors satisfy the safety standard of the runner material and meet requirements of safety and stability in the reverse power generation condition.
Highlights
Pumping stations are commonly used in engineering applications to pump water from one reservoir to another, including the drainage, flood control, water diversion and irrigation projects [1,2].in non-flood periods, water resources of the pump stations are often wasted
Wang carried out the numerical simulation of the impeller coupled system, with one-way fluid–structure interaction method on the CAE co-simulation platform, in order to accurately calculate the stress and deformation of the stamping and welding impeller in the flow field [16]
Transfer evaluated under pump and reverse power generation conditions
Summary
Pumping stations are commonly used in engineering applications to pump water from one reservoir to another, including the drainage, flood control, water diversion and irrigation projects [1,2]. It is of great significance to study the force and deformation of the runner blade to check the fatigue life of the pump in reverse conditions. A significant number of researchers have studied the force and deformation of the runner blades of pumps and turbines based on the numerical methods. Wang carried out the numerical simulation of the impeller coupled system, with one-way fluid–structure interaction method on the CAE co-simulation platform, in order to accurately calculate the stress and deformation of the stamping and welding impeller in the flow field [16]. Li Wei et al [22] used ANSYS to study the impeller rotor of Francis pump and compared the deformation and dynamic stress distribution of impeller blade, before and after fluid–solid coupling. TheThe remainder of the paper is organized as follows: First, thethe numerical modeling of aofFrancis pump in the
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