冲击式水轮机喷嘴CFD优化设计

哈尔滨工业大学工学硕士学位论文AbstractIt is abundance in water resource in our homeland.Water turbine that is a energyconversion device of water resource,is mainly include two style.One is impulsereaction turbine,the other is Pelton turbine.It is high level developing of impulsereaction turbine in our country.But it is not enough in Pelton turbine.This paper ismainly about simulation of nozzle which is one part of Pelton turbine.Pelton turbine that has the merit of on vapor erode restrict in high water head,simpleness in adjust system,convenience in running etc.has used generally in highlevel water and electricity sate.It analyses work principle,energy lost and parameter choice of Pelton turbine.Itmainly analyses structure,work principle,and influence factor of nozzle.It introducecompute principle and structure of CFD software Fluent.It mainly introduce thecompute principle,according to the angle of CFD,reappearance the work process andwell or else of CFD software.It give the element for the following work of simulationof nozzle through the understanding of above.According to the structure of nozzle,it set up the geometry modeling of nozzlethrough the mini-program.Based on the work principle of nozzle and computeprinciple of Fluent,it set up the mathematics modeling of nozzle.Then it synthesizethe geometry and mathematics modeling for simulating of nozzle.This paper choosetwo dimension axis symmetry viscosity VOF model,and use for reference the data ofexperiment of HEC of boundary condition.It write a post-processing program of nozzle for efficiency compute.It isevidence better of precision of efficiency of nozzle by contrasting to result oftradition method.The nozzle angle has a max.number around 90 degree bycomputing efficiency of nozzle.It find out that the static pressure is not decreasesteady by the surface of needle but have a max.number on the pinhead by theanalysis of needle static pressure.According to the simulation result of nozzle,sumup a formula of flux computing,find out that the coefficient is thrice function ofneedle relatively space.Keywords Efficient of nozzle;simulation of fluid field;flux formula of nozzle;optimizedesign of nozzle-Ⅱ-