發(fā)布時(shí)間：2018-05-11 17:41

  本文選題：軸向離心風(fēng)機(jī) + 效率��； 參考：《西南交通大學(xué)》2011年碩士論文

【摘要】：軸向離心風(fēng)機(jī)是依靠輸入的機(jī)械能,提高氣體壓力并排送氣體的機(jī)械,它是一種從動(dòng)的流體機(jī)械,廣泛應(yīng)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(fēng)機(jī)的性能可用風(fēng)機(jī)出口處的總壓和風(fēng)機(jī)的效率來(lái)衡量。以往對(duì)離心風(fēng)機(jī)的研究主要采用理論分析和實(shí)驗(yàn)相結(jié)合的方法,而近幾年來(lái),CFD(Computational Flud Dynamics)技術(shù)的發(fā)展以及商用CFD軟件的普及,使得通過(guò)計(jì)算機(jī)數(shù)值模擬和流體可視化的方法來(lái)研究軸向離心風(fēng)機(jī)的內(nèi)部流場(chǎng)和性能成為可能。 本文利用ANSYS CFX10.0軟件對(duì)THTF4.5軸向離心風(fēng)機(jī)在設(shè)計(jì)轉(zhuǎn)速工作狀態(tài)下的特性進(jìn)行了全三維定常數(shù)值模擬。論文主要內(nèi)容包括以下幾個(gè)方面：(1)用三維造型軟件UG建立軸向離心風(fēng)機(jī)內(nèi)流場(chǎng)的幾何模型,使用前處理軟件ICEM CFD對(duì)風(fēng)機(jī)流場(chǎng)劃分結(jié)構(gòu)化六面體H型網(wǎng)格,以保證CFD計(jì)算結(jié)構(gòu)的高精度；(2)采用K-epsilon兩方程紊流模型和RRF(Rotating Reference Frame)旋轉(zhuǎn)坐標(biāo)系模型,對(duì)風(fēng)機(jī)整個(gè)內(nèi)部流場(chǎng)進(jìn)行求解。利用CFD穩(wěn)態(tài)計(jì)算結(jié)果,分別對(duì)離心葉輪流場(chǎng)、靜子流域子午面流場(chǎng)、支板流場(chǎng)和回流間隙流場(chǎng)進(jìn)行后處理分析和研究。得出葉輪根、中流面的流場(chǎng)存在氣流分離現(xiàn)象,并根據(jù)計(jì)算結(jié)果指出這種明顯的不均勻氣流分離現(xiàn)象是由于結(jié)構(gòu)設(shè)計(jì)的不合理所引起；(3)以原始結(jié)構(gòu)風(fēng)機(jī)為基礎(chǔ),分別從優(yōu)化支板結(jié)構(gòu)和加裝環(huán)形隔板的角度出發(fā),提出兩種優(yōu)化結(jié)構(gòu),然后在流場(chǎng)分析和以往工程經(jīng)驗(yàn)的基礎(chǔ)上進(jìn)行了兩個(gè)優(yōu)化方案的數(shù)值模擬計(jì)算,用以提高風(fēng)機(jī)的出口總壓和風(fēng)機(jī)效率。CFD計(jì)算結(jié)果表明,兩種優(yōu)化方案的結(jié)果均好于原始設(shè)計(jì),其中改進(jìn)方案二的對(duì)性能和流場(chǎng)的改進(jìn)幅度較改進(jìn)方案一更大。 通過(guò)和試驗(yàn)數(shù)據(jù)的比較,該離心風(fēng)機(jī)的數(shù)值模擬結(jié)果比較令人滿意,其流量、壓比、效率等重要參數(shù)和試驗(yàn)相差在3%以內(nèi),兩個(gè)優(yōu)化方案的數(shù)值模擬結(jié)果明顯好于原設(shè)計(jì)方案的數(shù)值模擬結(jié)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(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH432

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