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

【摘要】：本課題來源于廣東省產(chǎn)學(xué)研項(xiàng)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(fēng)機(jī)和普通離心風(fēng)機(jī)相比具有大輪徑比，流量系數(shù)大，噪聲低等優(yōu)點(diǎn)，廣泛應(yīng)用于廚房、賓館酒樓等通風(fēng)換氣及抽油煙機(jī)和空調(diào)行業(yè)。但其效率較低，換氣扇的能耗在建筑通風(fēng)和空調(diào)行業(yè)耗能的比重比較大，所以提高多翼離心風(fēng)機(jī)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(jià)和開發(fā)時(shí)間，因此基于CFD數(shù)值模擬成為研究多翼離心風(fēng)機(jī)的一個(gè)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(jìn)行改造，在GAMBIT中對換氣扇模型和改造后的模型進(jìn)行處理和網(wǎng)格劃分，，用FLUENT對該多翼離心換氣扇進(jìn)行模擬計(jì)算，并通過試驗(yàn)驗(yàn)證了此計(jì)算方法的適用性。 對換氣扇某工況下的流動(dòng)進(jìn)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(jìn)氣柵內(nèi)的邊緣處也存在有明顯的漩渦現(xiàn)象，對葉輪進(jìn)出口和蝸殼內(nèi)部流動(dòng)的研究也表明換氣扇內(nèi)部流動(dòng)情況非常復(fù)雜。對大小流量兩種工況的流動(dòng)進(jìn)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(yán)重。 文中對多翼離心換氣扇進(jìn)氣格柵、葉片數(shù)目和蝸殼進(jìn)行優(yōu)化，并進(jìn)行了相同的數(shù)值計(jì)算。結(jié)果顯示：原模型的進(jìn)氣流分布不均勻，方形和圓形進(jìn)氣格柵的性能要優(yōu)于原格柵；對葉片數(shù)目的計(jì)算結(jié)果表明葉片數(shù)取44時(shí)，流道中漩渦區(qū)較小且和原模型的性能相當(dāng)；對葉輪安裝位置的改進(jìn)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(gè)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(jìn)行了測量，得到了指定接收點(diǎn)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(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH432;TU834.4

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