本文選題：軸向離心風機 + 效率　； 參考：《西南交通大學》2011年碩士論文

【摘要】：軸向離心風機是依靠輸入的機械能,提高氣體壓力并排送氣體的機械,它是一種從動的流體機械,廣泛應用于工廠、礦井、隧道、冷卻塔、車輛、船舶和建筑物的排塵和冷卻,軸向離心風機的性能可用風機出口處的總壓和風機的效率來衡量。以往對離心風機的研究主要采用理論分析和實驗相結合的方法,而近幾年來,CFD(Computational Flud Dynamics)技術的發(fā)展以及商用CFD軟件的普及,使得通過計算機數值模擬和流體可視化的方法來研究軸向離心風機的內部流場和性能成為可能。 本文利用ANSYS CFX10.0軟件對THTF4.5軸向離心風機在設計轉速工作狀態(tài)下的特性進行了全三維定常數值模擬。論文主要內容包括以下幾個方面：(1)用三維造型軟件UG建立軸向離心風機內流場的幾何模型,使用前處理軟件ICEM CFD對風機流場劃分結構化六面體H型網格,以保證CFD計算結構的高精度；(2)采用K-epsilon兩方程紊流模型和RRF(Rotating Reference Frame)旋轉坐標系模型,對風機整個內部流場進行求解。利用CFD穩(wěn)態(tài)計算結果,分別對離心葉輪流場、靜子流域子午面流場、支板流場和回流間隙流場進行后處理分析和研究。得出葉輪根、中流面的流場存在氣流分離現(xiàn)象,并根據計算結果指出這種明顯的不均勻氣流分離現(xiàn)象是由于結構設計的不合理所引起；(3)以原始結構風機為基礎,分別從優(yōu)化支板結構和加裝環(huán)形隔板的角度出發(fā),提出兩種優(yōu)化結構,然后在流場分析和以往工程經驗的基礎上進行了兩個優(yōu)化方案的數值模擬計算,用以提高風機的出口總壓和風機效率。CFD計算結果表明,兩種優(yōu)化方案的結果均好于原始設計,其中改進方案二的對性能和流場的改進幅度較改進方案一更大。 通過和試驗數據的比較,該離心風機的數值模擬結果比較令人滿意,其流量、壓比、效率等重要參數和試驗相差在3%以內,兩個優(yōu)化方案的數值模擬結果明顯好于原設計方案的數值模擬結果。
[Abstract]:Axial centrifugal fan is a kind of driven fluid machinery which is widely used in factories, mines, tunnels, cooling towers, vehicles, ships and buildings for dust removal and cooling. The performance of axial centrifugal fan can be measured by the total pressure at the outlet of the fan and the efficiency of the fan. In the past, the research of centrifugal fan mainly adopted the method of combining theory analysis with experiment, but in recent years, the development of CFDF Flud dynamic technology and the popularization of commercial CFD software, It is possible to study the internal flow field and performance of axial centrifugal fan by computer numerical simulation and fluid visualization. In this paper, the full-3D steady numerical simulation of the characteristics of THTF4.5 axial centrifugal fan under the working state of design speed is carried out by using ANSYS CFX10.0 software. The main contents of this paper are as follows: (1) the geometry model of flow field in axial centrifugal fan is established by using UG, and the flow field is divided into hexahedron H mesh by pre-processing software ICEM CFD. In order to guarantee the high accuracy of CFD calculation structure, the K-epsilon two-equation turbulence model and the RRF(Rotating Reference frame rotating coordinate system model are used to solve the flow field in the whole fan. The flow field of centrifugal impeller, meridional surface, branch plate and reflux gap were analyzed and studied by CFD steady state calculation. It is concluded that the flow field of the impeller root and the middle flow surface has the phenomenon of air flow separation, and according to the calculation results, it is pointed out that this obvious phenomenon of non-uniform air flow separation is caused by the unreasonable design of the structure) and is based on the original structure fan. From the point of view of optimizing the supporting plate structure and installing the annular diaphragm, two kinds of optimization structures are put forward, and the numerical simulation of the two optimization schemes is carried out on the basis of the flow field analysis and the previous engineering experience. The results show that the results of the two optimization schemes are better than those of the original design, and the performance and flow field of the improved scheme 2 are larger than that of the first one. By comparing with the experimental data, the numerical simulation results of the centrifugal fan are satisfactory, and the difference between the important parameters such as flow rate, pressure ratio, efficiency and test is less than 3%. The numerical simulation results of the two optimization schemes are obviously better than those of the original design scheme.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH432

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本文編號：1874927