本文關(guān)鍵詞： 誘導(dǎo)輪 葉頂間隙 空化 內(nèi)部流動(dòng) 實(shí)驗(yàn)　出處：《浙江理工大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：誘導(dǎo)輪為軸流式葉輪,工作時(shí)為避免管壁與葉片之間發(fā)生摩擦或者碰撞,管壁和葉片之間存在一定大小的間隙,即葉頂間隙。誘導(dǎo)輪內(nèi)部分流體受到葉片吸力面和壓力面壓差影響,在葉頂產(chǎn)生間隙泄漏流,這將對(duì)誘導(dǎo)輪的水力性能、內(nèi)部主流流動(dòng)及空化性能產(chǎn)生較大的影響。國(guó)內(nèi)外對(duì)于誘導(dǎo)輪在不同葉頂間隙下的葉頂間隙渦的演化、空化泡分布的位置等內(nèi)部流動(dòng)細(xì)節(jié)缺少深入的研究。因此本文以一圓柱形等螺距誘導(dǎo)輪為研究對(duì)象,分析了不同葉頂間隙對(duì)誘導(dǎo)輪內(nèi)部流動(dòng)和空化性能的影響。首先對(duì)比分析了七種葉頂間隙下誘導(dǎo)輪水力性能的變化規(guī)律,并重點(diǎn)分析了三種典型葉頂間隙下的誘導(dǎo)輪內(nèi)部流場(chǎng)、不同時(shí)刻內(nèi)部流場(chǎng)的演化過(guò)程以及空化泡位置的分布。本文的主要研究工作如下:(1)采用UG三維軟件對(duì)誘導(dǎo)輪進(jìn)行三維建模,采用ICEM對(duì)誘導(dǎo)輪內(nèi)部流道進(jìn)行網(wǎng)格劃分,并通過(guò)網(wǎng)格無(wú)關(guān)性驗(yàn)證,確定合理的網(wǎng)格數(shù)進(jìn)行后續(xù)的數(shù)值計(jì)算。(2)非空化工況下,對(duì)三種葉頂間隙下誘導(dǎo)輪內(nèi)部流場(chǎng)進(jìn)行定常和非定常數(shù)值模擬。對(duì)比分析流量和葉頂間隙對(duì)誘導(dǎo)輪性能和內(nèi)部流動(dòng)的影響,及誘導(dǎo)輪內(nèi)部流動(dòng)隨時(shí)間的演化過(guò)程。(3)對(duì)誘導(dǎo)輪進(jìn)行外特性實(shí)驗(yàn),獲得揚(yáng)程-流量的外特性曲線(xiàn),并與數(shù)值計(jì)算結(jié)果進(jìn)行對(duì)比分析,驗(yàn)證數(shù)值方法的準(zhǔn)確性。(4)對(duì)誘導(dǎo)輪進(jìn)行空化數(shù)值模擬,對(duì)比分析流量、葉頂間隙和空化數(shù)對(duì)內(nèi)部空化流動(dòng)、空化泡的發(fā)展和分布、葉片及彎管處壓力分布及內(nèi)部壓力演變過(guò)程的影響。
[Abstract]:The induction wheel is an axial flow impeller, in order to avoid friction or collision between the tube wall and the blade, there is a certain gap between the tube wall and the blade. That is, the tip clearance. Some fluids in the inducer are affected by the pressure difference between the suction surface and the pressure surface of the blade, and a gap leakage flow is produced at the top of the blade, which will affect the hydraulic performance of the inducer. The internal mainstream flow and cavitation performance have a great impact on the evolution of the tip clearance vortices of the inducer wheel under different top clearance at home and abroad. The location of cavitation bubble distribution and other internal flow details are lack of in-depth study, so this paper takes a cylindrical equal pitch induction wheel as the research object. The influence of different tip clearance on the flow and cavitation performance of the inducer is analyzed. Firstly, the hydraulic performance of the inducer under seven kinds of tip clearance is compared and analyzed. The internal flow field of three typical tip clearance inducers is analyzed. The evolution process of internal flow field and the distribution of cavitation bubble position at different time. The main research work of this paper is as follows: 1) using UG 3D software to model the induction wheel. The ICEM is used to mesh the inner channel of the induction wheel, and through the mesh independence verification, the reasonable number of meshes is determined to carry on the subsequent numerical calculation under the condition of non-cavitation. The steady and unsteady numerical simulation of the flow field in the inducer under three kinds of tip clearance was carried out, and the effects of flow rate and tip clearance on the performance and internal flow of the inducer were compared and analyzed. And the evolution process of the induced wheel flow with time. 3) the external characteristic curve of the induced wheel is obtained and compared with the results of numerical calculation. The accuracy of the numerical method is verified. (4) the cavitation simulation of the inducer is carried out, and the flow rate, the tip clearance and the cavitation number are compared to analyze the cavitation flow, the development and distribution of cavitation bubble. Influence of pressure distribution and internal pressure evolution at blade and bend.
【學(xué)位授予單位】：浙江理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TH31

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