【摘要】：軸流通風(fēng)機(jī)是一種在工農(nóng)業(yè)生產(chǎn)中有著極其重要作用的通用機(jī)械,它廣泛應(yīng)用于電力,冶金等行業(yè),尤其在火電廠中,風(fēng)機(jī)是電站鍋爐的主要的輔機(jī),它的耗電是廠用電耗的30%,因此對(duì)于它的性能研究是很有必要的。 軸流風(fēng)機(jī)的內(nèi)部流體的流動(dòng)是較為復(fù)雜的三維粘性流動(dòng),它的流動(dòng)狀況直接硬影響著其運(yùn)行性能。因此,對(duì)于研究風(fēng)機(jī)內(nèi)部流動(dòng)的特征是很重要的。目前,CFD技術(shù)成為分析風(fēng)機(jī)內(nèi)部流場(chǎng)特性的一個(gè)重要的手段,它可以較為準(zhǔn)確地預(yù)測(cè)風(fēng)機(jī)的性能,還可以描述其內(nèi)部流動(dòng)的規(guī)律,比如壓力場(chǎng)和速度場(chǎng)的變化規(guī)律。 本文以某電廠600MW機(jī)組的軸流引風(fēng)機(jī)為研究對(duì)象,通過現(xiàn)場(chǎng)對(duì)風(fēng)機(jī)的原型進(jìn)行測(cè)繪,利用Autocad對(duì)其進(jìn)行三維模型的構(gòu)造,然后利用Gambit對(duì)模型進(jìn)行網(wǎng)格劃分,確定計(jì)算的流域及邊界條件,利用Fluent進(jìn)行數(shù)值模擬計(jì)算,得出其內(nèi)部流動(dòng)的特性,并且對(duì)其不同工況下風(fēng)機(jī)運(yùn)行的幾種情況以及低轉(zhuǎn)速下風(fēng)機(jī)的運(yùn)行進(jìn)行了模擬,然后將數(shù)值模擬結(jié)果與風(fēng)機(jī)實(shí)際運(yùn)行情況進(jìn)行對(duì)比分析,結(jié)果表明數(shù)值模擬可以較準(zhǔn)確的反應(yīng)出風(fēng)機(jī)內(nèi)部的流體流動(dòng)的真實(shí)情況,而且結(jié)果也基本上符合了電廠風(fēng)機(jī)的實(shí)際運(yùn)行情況,這對(duì)下一步風(fēng)機(jī)的節(jié)能改造提供了重要的理論依據(jù)。
[Abstract]:Axial flow fan is a kind of universal machinery which plays a very important role in industrial and agricultural production. It is widely used in electric power, metallurgy and other industries, especially in thermal power plant, fan is the main auxiliary machine of power plant boiler. Its power consumption is 30% of power consumption, so it is necessary to study its performance. The internal flow of axial fan is a complicated three-dimensional viscous flow, and its flow condition directly affects its performance. Therefore, it is very important to study the characteristics of the flow inside the fan. At present, CFD technology has become an important means to analyze the characteristics of flow field in fan. It can accurately predict the performance of fan and describe the law of internal flow, such as the change of pressure field and velocity field. In this paper, the axial flow induced fan of 600MW unit in a power plant is taken as the research object, the prototype of the fan is mapped on the spot, the three-dimensional model is constructed by using Autocad, and then the model is meshed by Gambit. The calculated basin and boundary conditions are determined, and the characteristics of internal flow are obtained by numerical simulation with Fluent. Several conditions of fan operation under different operating conditions and the operation of fan at low speed are simulated. Then the numerical simulation results are compared with the actual operation of the fan. The results show that the numerical simulation can accurately reflect the real situation of the fluid flow inside the fan. The results basically accord with the actual operation of the fan in power plant, which provides an important theoretical basis for the energy saving transformation of the fan in the next step.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TH432.1

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