高速磁懸浮離心風(fēng)機氣動部分設(shè)計和仿真
發(fā)布時間：2019-05-17 00:32
【摘要】：離心風(fēng)機在社會應(yīng)用中扮演著十分重要的作用,由于其能耗低、轉(zhuǎn)速高、容積效率高且輸送氣體清潔干凈等優(yōu)點,被廣泛地應(yīng)用于化工廠、電廠以及建筑等場所的通風(fēng)換氣、排煙降溫以及處理污水中。在二級污水處理工藝系統(tǒng)中,風(fēng)機是曝氣流程系統(tǒng)的重要設(shè)備,風(fēng)機的效率是最重要的技術(shù)經(jīng)濟指標,其電耗占污水處理廠全部電耗的50%-60%。目前國內(nèi)的風(fēng)機,大部分還處于3000r/min的轉(zhuǎn)速水平,由于機械軸承的摩擦造成效率偏低。為此,專門研發(fā)新型高速磁懸浮離心風(fēng)機,合理設(shè)計葉輪的樣式以及結(jié)構(gòu)尺寸,采用SOLIDWORKS繪圖軟件精確繪制葉輪及蝸殼的三維圖形,應(yīng)用CFD流動分析軟件和SIMPLE算法,直觀描述離心風(fēng)機內(nèi)部三維粘性流場,根據(jù)模擬數(shù)據(jù)與計算數(shù)據(jù)之間的對比驗證風(fēng)機設(shè)計。 文章首先介紹了高速離心風(fēng)機與其他類型風(fēng)機比較所具有的突出優(yōu)點,隨后,論述了計算流體力學(xué)的理論知識和基本原理,并詳細地介紹了通用的FLUENT軟件的基本功能及特點。第三章介紹了葉輪內(nèi)流體的基本方程以及葉輪選型的依據(jù),然后推導(dǎo)出離心風(fēng)機氣動部分的結(jié)構(gòu)計算式,對部分參數(shù)選取合理的預(yù)選初值,并用MATLAB對計算過程進行編程,最終計算出包括葉片數(shù)、級數(shù)、葉輪進出口直徑以及葉輪轉(zhuǎn)速等參數(shù)。第四章以這些參數(shù)值為預(yù)選值,應(yīng)用SOLIDWORKS搭建高速風(fēng)機葉輪、擴壓器以及蝸殼等部分的三維模型,并將這些模型的STEP文件導(dǎo)入GAMBIT軟件中,采用TET/HYBRID網(wǎng)格單元、TGRID網(wǎng)格類型以及合適的網(wǎng)格尺寸對這些模型進行網(wǎng)格劃分。 文章的最后部分,介紹了本模型采用的幾種FLUENT邊界條件并詳述了設(shè)定過程。隨后,采用分離隱式求解器,應(yīng)用標準k-ε兩方程湍流模型,對高速磁懸浮離心風(fēng)機氣動部分進行了數(shù)值模擬,將仿真計算獲得的葉輪進出口壓力、葉輪出口圓周速度矢量以及湍動能等參數(shù)的值與對應(yīng)的設(shè)計預(yù)選值進行了分析和比較。 結(jié)果表明,數(shù)值模擬計算出來的結(jié)果與設(shè)計預(yù)選數(shù)據(jù)基本吻合,驗證了本文模型設(shè)計的合理性,即本文前面經(jīng)過公式推導(dǎo)設(shè)計的葉輪、擴壓器以及蝸殼的結(jié)構(gòu)尺寸能夠滿足項目要求。應(yīng)用本文提供的設(shè)計公式和建模方法完全可以設(shè)計出符合預(yù)期效果的高速離心風(fēng)機氣動部分的結(jié)構(gòu)尺寸,并可以用于工程實際。本課題的研究為新型高速磁懸浮風(fēng)機的設(shè)計提供理論依據(jù),對于提高高速離心式風(fēng)機的設(shè)計水平具有重要意義。
[Abstract]:Centrifugal fan plays a very important role in social application. Because of its low energy consumption, high rotating speed, high volume efficiency and clean transportation gas, centrifugal fan has been widely used in ventilation and ventilation in chemical plants, power plants, buildings and other places. Exhaust smoke and cool down and treat sewage. In the secondary sewage treatment process system, the fan is an important equipment of the aeration process system, and the efficiency of the fan is the most important technical and economic index, and its power consumption accounts for 50% of the total power consumption of the sewage treatment plant. At present, most of the domestic fans are still at the speed level of 3000r/min, and the efficiency is low due to the friction of mechanical bearings. For this reason, a new type of high speed maglev centrifugal fan is specially developed, the style and structure size of impeller are reasonably designed, the 3D graphics of impeller and volute are accurately drawn by SOLIDWORKS drawing software, and the flow analysis software CFD and SIMPLE algorithm are used. The three-dimensional viscous flow field in centrifugal fan is described intuitively, and the fan design is verified according to the comparison between simulation data and calculation data. This paper first introduces the outstanding advantages of high speed centrifugal fan compared with other types of fan, then discusses the theoretical knowledge and basic principle of computational fluid mechanics, and introduces in detail the basic functions and characteristics of general FLUENT software. In the third chapter, the basic equation of fluid in impeller and the basis of impeller selection are introduced, then the structure calculation formula of pneumatic part of centrifugal fan is deduced, the reasonable initial value of pre-selection of some parameters is selected, and the calculation process is programmed with MATLAB. Finally, the parameters including blade number, series, impeller inlet and outlet diameter and impeller speed are calculated. In the fourth chapter, taking these parameter values as pre-selected values, the 3D models of high speed fan impeller, diffuser and volute are built by SOLIDWORKS, and the STEP files of these models are imported into GAMBIT software, and TET/HYBRID grid element is used. These models are meshed by TGRID grid type and appropriate grid size. In the last part of the paper, several FLUENT boundary conditions used in this model are introduced and the setting process is described in detail. Then, the pneumatic part of the high-speed maglev centrifugal fan is simulated by using the separation implicit solver and the standard k-蔚 two-equation turbulence model, and the inlet and outlet pressure of the impeller is calculated by the simulation. The values of circumferential velocity vector and turbulent kinetic energy at the outlet of impeller are analyzed and compared with the corresponding design preset values. The results show that the results calculated by numerical simulation are in good agreement with the pre-selected data of the design, which verifies the rationality of the design of the model in this paper, that is, the impeller designed by formula derivation in front of this paper. The structure and size of diffuser and volute can meet the requirements of the project. The structure size of the pneumatic part of the high speed centrifugal fan which accords with the expected effect can be designed by using the design formula and modeling method provided in this paper, and can be used in engineering practice. The research of this paper provides a theoretical basis for the design of a new type of high-speed maglev fan, and is of great significance to improve the design level of high-speed centrifugal fan.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH432
本文編號：2478668
[Abstract]:Centrifugal fan plays a very important role in social application. Because of its low energy consumption, high rotating speed, high volume efficiency and clean transportation gas, centrifugal fan has been widely used in ventilation and ventilation in chemical plants, power plants, buildings and other places. Exhaust smoke and cool down and treat sewage. In the secondary sewage treatment process system, the fan is an important equipment of the aeration process system, and the efficiency of the fan is the most important technical and economic index, and its power consumption accounts for 50% of the total power consumption of the sewage treatment plant. At present, most of the domestic fans are still at the speed level of 3000r/min, and the efficiency is low due to the friction of mechanical bearings. For this reason, a new type of high speed maglev centrifugal fan is specially developed, the style and structure size of impeller are reasonably designed, the 3D graphics of impeller and volute are accurately drawn by SOLIDWORKS drawing software, and the flow analysis software CFD and SIMPLE algorithm are used. The three-dimensional viscous flow field in centrifugal fan is described intuitively, and the fan design is verified according to the comparison between simulation data and calculation data. This paper first introduces the outstanding advantages of high speed centrifugal fan compared with other types of fan, then discusses the theoretical knowledge and basic principle of computational fluid mechanics, and introduces in detail the basic functions and characteristics of general FLUENT software. In the third chapter, the basic equation of fluid in impeller and the basis of impeller selection are introduced, then the structure calculation formula of pneumatic part of centrifugal fan is deduced, the reasonable initial value of pre-selection of some parameters is selected, and the calculation process is programmed with MATLAB. Finally, the parameters including blade number, series, impeller inlet and outlet diameter and impeller speed are calculated. In the fourth chapter, taking these parameter values as pre-selected values, the 3D models of high speed fan impeller, diffuser and volute are built by SOLIDWORKS, and the STEP files of these models are imported into GAMBIT software, and TET/HYBRID grid element is used. These models are meshed by TGRID grid type and appropriate grid size. In the last part of the paper, several FLUENT boundary conditions used in this model are introduced and the setting process is described in detail. Then, the pneumatic part of the high-speed maglev centrifugal fan is simulated by using the separation implicit solver and the standard k-蔚 two-equation turbulence model, and the inlet and outlet pressure of the impeller is calculated by the simulation. The values of circumferential velocity vector and turbulent kinetic energy at the outlet of impeller are analyzed and compared with the corresponding design preset values. The results show that the results calculated by numerical simulation are in good agreement with the pre-selected data of the design, which verifies the rationality of the design of the model in this paper, that is, the impeller designed by formula derivation in front of this paper. The structure and size of diffuser and volute can meet the requirements of the project. The structure size of the pneumatic part of the high speed centrifugal fan which accords with the expected effect can be designed by using the design formula and modeling method provided in this paper, and can be used in engineering practice. The research of this paper provides a theoretical basis for the design of a new type of high-speed maglev fan, and is of great significance to improve the design level of high-speed centrifugal fan.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH432
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