發(fā)布時間：2018-07-23 11:05

【摘要】：車載離心風機要求結構緊湊、重量輕、出口壓力相對較高,但傳統(tǒng)設計方法精度低、參數(shù)取值范圍大,往往不能滿足風機優(yōu)化設計的要求,這就需要對離心風機內部微觀流動進行分析,提高風機的設計精度。論文分析了目前風機的設計方法以及理論研究現(xiàn)狀,以離心風機為研究對象運用SOLIDWORKS軟件建立了離心風機的幾何模型,調入GAMBIT進行網(wǎng)格化分和邊界條件設置,用FLUENT軟件對風機流場進行了數(shù)值計算,得到了風機內部流場分布,并研究了風機結構參數(shù)對風機性能的影響。 通過研究表明,除葉片出口安裝角之外,葉片進口安裝角對風機性能的影響較顯著。在進一步的研究中,分析了進口安裝角、出口安裝角、葉輪寬度、蝸殼出口擴壓角以及葉片數(shù)量等結構參數(shù)對風機的性能的影響。隨著葉片出口安裝角、葉輪寬度、葉片數(shù)的增加,風機的全壓都增加;隨著風機葉片進口安裝角的增加,風機全壓先增加,然后減小,存在一個極值;隨著蝸殼出口擴壓角度的增大,風機全壓有所增加,但當擴壓角超過一定值后全壓增加緩慢�；�于研究結果對風機結構進行了優(yōu)化,對結構優(yōu)化風機流場的數(shù)值模擬結果顯示風機設計合理、全壓達到使用要求,靜壓裕量為7.12%。論文研究結果為離心式通風機的優(yōu)化設計提供了一定的理論依據(jù)和參考。
[Abstract]:Truck centrifugal fan requires compact structure, light weight, relatively high outlet pressure, but the traditional design method has low precision and wide range of parameters, so it can not meet the requirements of fan optimization design. In order to improve the design precision of centrifugal fan, it is necessary to analyze the micro flow inside the centrifugal fan. This paper analyzes the design method and the current research situation of the centrifugal fan. The geometry model of the centrifugal fan is established by using SOLIDWORKS software, and the grid division and boundary condition setting are carried out with gambit. The flow field of the fan is numerically calculated with fluent software, and the distribution of the flow field inside the fan is obtained, and the influence of the structure parameters of the fan on the performance of the fan is studied. The results show that the influence of blade inlet installation angle on fan performance is significant except for blade outlet mounting angle. In the further study, the influence of the structural parameters such as inlet installation angle, outlet installation angle, impeller width, volute outlet diffuser angle and the number of blades on the performance of the fan are analyzed. With the increase of blade outlet angle, impeller width and number of blades, the total pressure of the fan increases, and with the increase of the inlet angle of the fan blade, the total pressure of the fan first increases and then decreases, and there is an extreme value. With the increase of expanding angle at the outlet of volute, the total pressure of fan increases, but when the angle of expansion exceeds a certain value, the total pressure increases slowly. Based on the research results, the fan structure is optimized. The numerical simulation results of the fan flow field show that the fan design is reasonable, the full pressure meets the operational requirements, and the static pressure margin is 7.12. The research results provide some theoretical basis and reference for the optimization design of centrifugal fan.
【學位授予單位】：中國石油大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH432

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