Pressure pulsation in Kaplan turbines:Prototype-CFD comparison
作者单位：Laboratorio de HidromecánicaFacultad de IngenieríaUniversidad Nacional de La Plata47 No200La PlataArgentina
会议名称：《The 26th IAHR Symposium on Hydraulic Machinery and Systems》
会议日期：2012年
学科分类：080704[工学-流体机械及工程] 08[工学] 0807[工学-动力工程及工程热物理]
摘 要：Pressure pulsation phenomena in a large Kaplan turbine are investigated by means of numerical simulations （CFD） and prototype measurements in order to study the dynamic behavior of flow due to the blade passage and its interaction with other components of the *** simulations are performed with the commercial software Ansys CFX code,solving the incompressible Unsteady Reynolds-Averaged-Navier Stokes equations under a finite volume *** computational domain involves the entire machine at prototype *** care is taken in the discretization of the wicket gate overhang and runner blade *** measurements are performed using pressure transducers at different locations among the wicket gate outlet and the draft tube ***,CFD results are compared with temporary signals of prototype measurements at identical locations to validate the numerical model.A detailed analysis was focused on the tip gap flow and the pressure field at the discharge *** a rotating reference frame perspective,it is found that the mean pressure fluctuates accordingly the wicket gate ***,in prototype measurements the pressure frequency that reveals the presence of modulated cavitation at the discharge ring is distinguished,as also verified from the shape of erosion patches in concordance with the number of wicket gates.