【摘要】：目前,火力發(fā)電站的單機(jī)容量越來(lái)越大。動(dòng)葉可調(diào)式軸流風(fēng)機(jī)因其在大流量時(shí)具有較寬的高效區(qū)和較高的經(jīng)濟(jì)性,而被國(guó)內(nèi)外300MW及以上的大容量火電機(jī)組廣泛采用。為了對(duì)軸流風(fēng)機(jī)的內(nèi)部部分流動(dòng)特性進(jìn)行詳細(xì)的了解,為引風(fēng)機(jī)的結(jié)構(gòu)優(yōu)化設(shè)計(jì)提供理論依據(jù)和參考數(shù)據(jù),本文利用CFD數(shù)值計(jì)算軟件對(duì)引風(fēng)機(jī)內(nèi)部的流動(dòng)狀況及性能進(jìn)行數(shù)值模擬。 本文以某電站的引風(fēng)機(jī)為例,采用繪圖軟件CAD與流體計(jì)算軟件FLUENT相結(jié)合的方法,重點(diǎn)研究不同配置的進(jìn)氣箱內(nèi)部流動(dòng)情況,對(duì)不同配置風(fēng)機(jī)進(jìn)口箱的內(nèi)流流線、靜壓分布以及性能進(jìn)行分析比較,尋找進(jìn)氣箱優(yōu)化設(shè)計(jì)途徑與方法。 本文在不同流動(dòng)條件下,對(duì)進(jìn)口預(yù)旋角不同的軸流式引風(fēng)機(jī)的內(nèi)部流場(chǎng)及其流動(dòng)特性進(jìn)行重點(diǎn)分析,了解葉輪進(jìn)口預(yù)旋角與風(fēng)機(jī)內(nèi)流特性的關(guān)系,通過(guò)模擬初步確定最佳葉輪進(jìn)口預(yù)旋角度,為葉輪內(nèi)流場(chǎng)的優(yōu)化提供參考。 同時(shí),本文通過(guò)改變動(dòng)葉可調(diào)軸流風(fēng)機(jī)的葉片安裝角,運(yùn)用數(shù)值模擬軟件,得到不同安裝角時(shí)的引風(fēng)機(jī)的速度和壓力的分布情況,了解葉輪安裝角與風(fēng)機(jī)性能的關(guān)系,對(duì)不同安裝角的引風(fēng)機(jī)的性能進(jìn)行分析比較,為現(xiàn)場(chǎng)的實(shí)際引風(fēng)機(jī)的設(shè)計(jì)、節(jié)能改造提供理論依據(jù)。
[Abstract]:At present, the single unit capacity of thermal power station is more and more large. The adjustable axial fan with moving vane is widely used in large capacity thermal power units at home and abroad because of its wide high efficiency area and high economy when the flow rate is large. In order to understand the internal flow characteristics of axial fan in detail and provide theoretical basis and reference data for the structure optimization design of induced fan, In this paper, CFD software is used to simulate the flow state and performance of the induced fan. In this paper, taking the induced fan of a power station as an example, the method of combining drawing software CAD with fluid calculation software FLUENT is used to study the internal flow situation of the inlet air box with different configurations, and the inner flow streamline of the inlet box of the different configuration fan is studied. Static pressure distribution and performance were analyzed and compared to find the optimal design approach and method. In this paper, the internal flow field and its flow characteristics of axial flow induced fan with different inlet prerotation angles are analyzed in different flow conditions, and the relationship between the inlet prerotation angle of impeller and the inner flow characteristics of fan is understood. The optimal inlet prerotation angle of impeller is preliminarily determined by simulation, which provides a reference for the optimization of impeller flow field. At the same time, by changing the blade installation angle of the adjustable axial flow fan with moving blade and using the numerical simulation software, the distribution of velocity and pressure of the induced fan with different installation angles is obtained, and the relationship between the installation angle of the impeller and the performance of the fan is understood. The performance of the induced fan with different installation angles is analyzed and compared, which provides the theoretical basis for the design and energy saving transformation of the field actual induced fan.
【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】：2012
【分類號(hào)】：TH432.1

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