Comprehensive Detection Radar Altimeter Simulator Design

With the development boom of hydropower,recourse and the developing exhaustion of the high dams with large reservoir recourses in China,people divert attention to the exploitation of the run-river recourses.Because of the advantages of exploiting the low-head water recourses,an increasing number of researches begin to focus on the tubular turbine.Our country has abundant low-head water resources.However,there is not have the special runner used for low-head water resources.So the runner should be modified.This study conducted three-dimensional numerical simulation to the runners with different numbers of blades by using the software of CFD and would like to make contribution to the development of the low-head or,moreover,ultra low-head water recourses.The main content and conclusions are as follow:Firstly,this research conducts three-dimensional numerical simulation to bulb turbine’s model runner with four blades.45 condition points have been selected to evaluate the efficiency of runners and the equal efficiency curves has been drawn after the simulation.By comparing the simulation results and the experimental results and analyzing the error reason,the reliability of this calculation method has been verified.Secondly,three-dimensional numerical simulation has also been tested on three bulb turbine’s model runners with different number of blades.By comparing the results,we obtained that if the number of runner’s blades decrease,the adaptation of runner’s unit speed and unit discharge would increase.It means the model’s characteristic curves will move to the upper right.The decrease in number of runner’s blades leads to increase of the flow capacity of turbine,and makes the turbine more suitable to the low-head and big flow condition.Otherwise,this study proposes an assumption of developing a tubular turbine runner with two blades as well.A three blades runner is modified into a two blades runner,and the simulation has been conducted on the modified runner.It contains 60 condition points in total with two different angles of blades and different unit speed of runner.By estimating the flow pattern after simulation,it provides some support to the development of the tubular turbine with two blades which is more suitable to exploit the low-head water resources based on numerical simulation.It is applicable to exploit the low-head water resources like rivers on the flat area and the coastal tide resources.Fully utilize the water resources to make benefits.