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  本文選題：多翼離心換氣扇 + CFD模擬��； 參考：《華中科技大學》2012年碩士論文

【摘要】：本課題來源于廣東省產(chǎn)學研項目“新型高效節(jié)能低噪型換氣扇的開發(fā)及產(chǎn)業(yè)化”（編號2010B090400446），多翼離心風機和普通離心風機相比具有大輪徑比，流量系數(shù)大，噪聲低等優(yōu)點，廣泛應用于廚房、賓館酒樓等通風換氣及抽油煙機和空調(diào)行業(yè)。但其效率較低，換氣扇的能耗在建筑通風和空調(diào)行業(yè)耗能的比重比較大，所以提高多翼離心風機的性能具有十分重要的意義。 另外采用傳統(tǒng)的研究方法，則會增加產(chǎn)品開發(fā)代價和開發(fā)時間，因此基于CFD數(shù)值模擬成為研究多翼離心風機的一個重要方法。本文以某型號多翼離心換氣扇為研究對象，并對多翼離心換氣扇模型進行改造，在GAMBIT中對換氣扇模型和改造后的模型進行處理和網(wǎng)格劃分，，用FLUENT對該多翼離心換氣扇進行模擬計算，并通過試驗驗證了此計算方法的適用性。 對換氣扇某工況下的流動進行了具體的分析研究。結(jié)果表明：在葉輪的前盤位置附近處，存在有明顯的回流現(xiàn)象，在進氣柵內(nèi)的邊緣處也存在有明顯的漩渦現(xiàn)象，對葉輪進出口和蝸殼內(nèi)部流動的研究也表明換氣扇內(nèi)部流動情況非常復雜。對大小流量兩種工況的流動進行了對比分析，結(jié)果表明在小流量工況下蝸殼蝸舌附近位置處回流現(xiàn)象比大流量下的要嚴重。 文中對多翼離心換氣扇進氣格柵、葉片數(shù)目和蝸殼進行優(yōu)化，并進行了相同的數(shù)值計算。結(jié)果顯示：原模型的進氣流分布不均勻，方形和圓形進氣格柵的性能要優(yōu)于原格柵；對葉片數(shù)目的計算結(jié)果表明葉片數(shù)取44時，流道中漩渦區(qū)較小且和原模型的性能相當；對葉輪安裝位置的改進表明：原有換氣扇葉輪中心和蝸殼的相對位置不是最佳位置，優(yōu)化后的蝸殼與葉輪的相對位置使換氣扇的壓力提高。噪聲是換氣扇的一個很重要的參數(shù)，噪聲的大小直接決定著換氣扇的優(yōu)劣。本文對噪聲利用噪聲測量儀進行了測量，得到了指定接收點位置的噪聲級大小。
[Abstract]:This subject comes from the project "Development and industrialization of a new type of ventilator with high efficiency, energy saving and low noise" (No. 2010B090400446). Compared with ordinary centrifugal fan, multi-wing centrifugal fan has the advantages of large ratio of wheel diameter, large flow coefficient, low noise and so on.Widely used in kitchen, hotel restaurants and other ventilation and range hood and air conditioning industry.But its efficiency is low, and the energy consumption of ventilator is large in the building ventilation and air conditioning industry, so it is very important to improve the performance of multi-wing centrifugal fan.In addition, the traditional research method will increase the cost and time of product development, so numerical simulation based on CFD has become an important method to study multi-wing centrifugal fan.In this paper, a certain type of multi-wing centrifugal fan is taken as the research object, and the model of the multi-wing centrifugal ventilator is modified. The model of the fan and the modified model are processed and meshed in GAMBIT.The multi-wing centrifugal fan is simulated and calculated by FLUENT, and the applicability of the method is verified by experiments.The flow of the ventilator under a certain working condition is analyzed and studied in detail.The results show that there is an obvious backflow phenomenon near the front disc of the impeller and an obvious swirl phenomenon at the edge of the inlet grid.The study of the impeller inlet and outlet and the flow inside the volute also shows that the flow inside the ventilator is very complicated.The flow around the cochlea tongue of the volute is more serious under the small flow condition than the one under the large flow rate. The results show that the flow around the cochlea tongue of the volute case is more serious than that at the large flow rate.In this paper, the intake grille, blade number and volute of multi-wing centrifugal ventilator are optimized, and the same numerical calculation is carried out.The results show that the inlet flow distribution of the original model is uneven, and the performance of the square and circular intake grille is better than that of the original grille, and the calculation results of the number of blades show that the swirl region in the flow channel is smaller and the performance is similar to that of the original model when the number of blades is 44.The improvement of the impeller mounting position shows that the relative position of the original fan impeller center and volute is not the optimal position, and the relative position of the optimized volute and impeller increases the pressure of the ventilator.Noise is an important parameter of ventilator, and the magnitude of noise directly determines the quality of ventilator.In this paper, the noise is measured by using the noise measuring instrument, and the noise level of the designated receiving point is obtained.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH432;TU834.4

【參考文獻】

相關期刊論文 前10條

1 成心德,葉樺;離心通風機前彎葉輪葉片數(shù)的選取[J];東北工學院學報;1991年01期

2 莊鎮(zhèn)榮;集流器對前向多翼離心通風機氣動性能的影響分析[J];風機技術;2002年03期

3 魏文平,蔡兆麟;空調(diào)器多翼離心通風機整機定常流動的數(shù)值模擬[J];風機技術;2004年03期

4 張素梅;郭培紅;溫小萍;李同卓;;多翼離心風機CFD分析及參數(shù)優(yōu)化設計[J];風機技術;2011年04期

5 李景銀;田華;牛子寧;;葉片開縫的離心風機流場研究[J];工程熱物理學報;2009年12期

6 朱營康,曹琦,姚承范;離心壓縮機葉片載荷分析[J];航空學報;1989年05期

7 李曉麗;楚武利;袁森;;離心風機整機三維數(shù)值仿真方法及分析[J];計算機仿真;2010年10期

8 韓非非;席德科;;多翼離心風機數(shù)值計算及改進設計研究[J];機械科學與技術;2010年08期

9 張立祥;潘地林;;離心葉輪的參數(shù)化設計[J];礦山機械;2007年02期

10 許洪元;圓弧形葉片型線的理論研究[J];流體工程;1990年08期

本文編號：1750043