【摘要】：目前,火力發(fā)電站的單機容量越來越大。動葉可調(diào)式軸流風機因其在大流量時具有較寬的高效區(qū)和較高的經(jīng)濟性,而被國內(nèi)外300MW及以上的大容量火電機組廣泛采用。為了對軸流風機的內(nèi)部部分流動特性進行詳細的了解,為引風機的結(jié)構(gòu)優(yōu)化設(shè)計提供理論依據(jù)和參考數(shù)據(jù),本文利用CFD數(shù)值計算軟件對引風機內(nèi)部的流動狀況及性能進行數(shù)值模擬。 本文以某電站的引風機為例,采用繪圖軟件CAD與流體計算軟件FLUENT相結(jié)合的方法,重點研究不同配置的進氣箱內(nèi)部流動情況,對不同配置風機進口箱的內(nèi)流流線、靜壓分布以及性能進行分析比較,尋找進氣箱優(yōu)化設(shè)計途徑與方法。 本文在不同流動條件下,對進口預(yù)旋角不同的軸流式引風機的內(nèi)部流場及其流動特性進行重點分析,了解葉輪進口預(yù)旋角與風機內(nèi)流特性的關(guān)系,通過模擬初步確定最佳葉輪進口預(yù)旋角度,為葉輪內(nèi)流場的優(yōu)化提供參考。 同時,本文通過改變動葉可調(diào)軸流風機的葉片安裝角,運用數(shù)值模擬軟件,得到不同安裝角時的引風機的速度和壓力的分布情況,了解葉輪安裝角與風機性能的關(guān)系,對不同安裝角的引風機的性能進行分析比較,為現(xiàn)場的實際引風機的設(shè)計、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.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH432.1

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本文編號：2186374