Type Selection And Performance Analysis Of Hydraulic Turbine Intake Room For Recovery Of Residual Energy

With the sharp decline in the world's traditional fossil energy reserves and the increasing demand for energy from the modern industrial society,the 19 th National Government's report has repeatedly emphasized building a resource-saving society.However,in the existing petroleum,chemical,desalination,and steel metallurgy industries,there is a possibility that the residual pressure of the high-pressure liquid can be decompressed to a practically required low pressure or directly discharged through a pressure reducing valve.This results in a large amount of fluid pressure directly dissipating in the environment and wasting energy.If we can make reasonable use of this part of energy,we can not only reduce production costs but also reduce carbon emissions.The hydraulic turbine device can recover the energy of high residual pressure and convert the energy of high residual pressure into mechanical energy.Therefore,based on the design theory of the hydraulic turbine,three typical types of inlet chambers are designed for the conventional water turbine volute inlet chamber,the variable multistage pump vortex chamber type inlet chamber and the multistage pump ring pressurized water chamber.The hydraulic performance and flow field characteristics of the three different types of inlet chambers are studied and discussed.Three different types of two stage hydraulic turbine,such as stage energy utilization,flow capacity and optimal working conditions,provide support for further research of hydraulic turbine.Taking PRO/E software as a tool,this paper is based on the design theory of turbine model worm shell,which is based on the design of hydraulic turbine inlet chamber type including type A-conventional water turbine spiral case inlet chamber,type B-variant multistage pump vortex chamber type inlet chamber and type C-multistage pump ring pressure water chamber type inlet chamber,and three different kinds of 6 types of inlet chamber.The water chamber is used for the three-dimensional modeling of the two level hydraulic turbine.Taking the design model as the research object and using the CFDnumerical simulation method,the numerical model is calculated and analyzed for the flow field of three hydraulic turbines at different flow rates,0.6Qr,0.8Qr,1.0Qr,1.2Qr and 1.4Qr,respectively.The external characteristic curves and the external characteristic curves of the two level hydrodynamic leveling of the three type inlet chambers are analyzed.The energy loss of each part,and the distribution of pressure and velocity within the internal characteristics.According to their respective energy conditions,the optimal operating conditions,over-current capacity and optimal efficiency are obtained.Comparing with the results of simulation experiments,the effect of secondary level energy utilization in the three modes is compared and analyzed,and it is of significance to study more advanced hydraulic turbines.