本文選題：螺旋離心泵 + 固液兩相流　； 參考：《蘭州理工大學(xué)》2012年碩士論文

【摘要】：螺旋離心泵是一種具有極好的無堵塞、無纏繞與損傷少的新型雜質(zhì)泵。它在污水的排放以及食品、造紙等工業(yè)部門已得到了廣泛的應(yīng)用。螺旋離心泵和一般離心泵的主要區(qū)別在于裝有螺旋離心葉輪，葉輪進(jìn)口部分為螺旋葉片，，出口部分近似于混流葉片，螺旋部分有容積泵的作用，離心部分將葉輪能量在蝸殼內(nèi)轉(zhuǎn)化成輸送介質(zhì)向外的壓力能，其獨(dú)特的結(jié)構(gòu)使其具有螺旋泵和離心泵的雙重優(yōu)點。 目前螺旋離心泵兩相流的數(shù)值模擬大多采用定常的數(shù)值模擬，雖然能在一定程度上能反應(yīng)其內(nèi)部流場的特性，但它沒有較真實地反映螺旋離心泵內(nèi)部的復(fù)雜流動情況，造成分析內(nèi)特性時不夠精確，進(jìn)而對提高螺旋離心泵的外特性方面產(chǎn)生了不利的影響，本課題擬對螺旋離心泵內(nèi)的固液兩相流進(jìn)行非定常的數(shù)值計算，從而得到比較反映物理真實的螺旋離心泵內(nèi)部固液兩相流流場的特性，為提高其性能提供理論依據(jù)和參考。 本課題的主要研究內(nèi)容如下： 1、根據(jù)螺旋離心泵的結(jié)構(gòu)特點以及其內(nèi)部兩相流場特點，忽略輪轂與后蓋板間的間隙流動，對螺旋離心泵流動區(qū)域進(jìn)行了簡化，并將其劃分為進(jìn)口區(qū)域、葉輪旋轉(zhuǎn)區(qū)域和蝸殼三個區(qū)域； 2、利用PRO/E對150×100LN-32型螺旋離心泵進(jìn)行三維實體建模，利用ICEM對三個流動區(qū)域分別進(jìn)行網(wǎng)格的劃分，再分別導(dǎo)入FLUENT進(jìn)行合并； 3、利用FLUENT軟件對150×100LN-32型螺旋離心泵進(jìn)行了非定常數(shù)值模擬，對其外特性跟內(nèi)流場進(jìn)行了分析，獲得了螺旋離心泵外特性與內(nèi)流場隨著葉輪的旋轉(zhuǎn)在不同時刻下的變化規(guī)律； 4、利用FLUENT軟件對150×100LN-32型螺旋離心泵在5種不同流量、5種不同固相體積濃度下的內(nèi)部多相流流場進(jìn)行了數(shù)值模擬與分析，獲得了不同流量和不同固相體積濃度對其外特性跟內(nèi)流場（壓力、速度、流線）的影響。 本課題的創(chuàng)新點如下： 1、對150×100LN-32型螺旋離心泵內(nèi)部多相流進(jìn)行了深入的研究，提出采用Mixture多相流模型、標(biāo)準(zhǔn)k ε湍流模型以及滑移網(wǎng)格技術(shù)對螺旋離心泵內(nèi)部流場進(jìn)行了非定常數(shù)值模擬的方法； 2、通過設(shè)置監(jiān)測點方法獲得了螺旋離心泵的壓力脈動特性以及軸向力、徑向力等誘導(dǎo)力特性。 本課題的結(jié)論如下： 1、通過對清水介質(zhì)在額定工況下一個周期的非定常數(shù)值計算，得出效率、揚(yáng)程、軸向力、徑向力隨葉輪相位角變化的波動規(guī)律以及蝸殼中截面壓力和流道軸截面流線隨葉輪的旋轉(zhuǎn)在不同時刻的變化規(guī)律； 2、通過對含沙水在不同流量下一個周期的非定常計算，得出蝸殼出口面壓力、葉輪所受軸向力、徑向力以及扭矩隨流量的改變在一個周期內(nèi)的波動規(guī)律，并且分析了葉片工作面、背面、蝸殼中截面的壓力以及固相體積濃度在不同流量下不同時刻的變化規(guī)律； 3、通過對含沙水在不同固相體積濃度下一個周期的非定常計算，得出了蝸殼出口面壓力、葉輪所受徑向力、軸向力、扭矩以及蝸殼壁面監(jiān)測點隨固相體積濃度的改變在一個周期內(nèi)的波動規(guī)律，并且分析了葉片工作面、背面、蝸殼中截面的壓力、速度、固相體積濃度分布以及軸截面流線在不同固相體積濃度下不同時刻的變化規(guī)律。
[Abstract]:The spiral centrifugal pump is a new type of impurity pump which has excellent non - clogging , no winding and less damage . The main difference between the spiral centrifugal pump and the general centrifugal pump has been widely applied . The main difference between the spiral centrifugal pump and the general centrifugal pump is that the spiral centrifugal impeller is installed , the inlet part of the impeller is helical blade , the outlet part is similar to the mixed flow blade , the spiral part has the function of volume pump , and the centrifugal part transforms the energy of the impeller in the volute to the outward pressure energy , and the unique structure makes it have the double advantages of the screw pump and the centrifugal pump .

The numerical simulation of the two - phase flow of the spiral centrifugal pump mostly adopts constant numerical simulation , although it can reflect the characteristics of the internal flow field to a certain extent , it does not accurately reflect the complex flow situation inside the spiral centrifugal pump , which leads to an unfavorable influence on the external characteristics of the spiral centrifugal pump , and the characteristic of the solid - liquid two - phase flow field in the spiral centrifugal pump is proposed to be compared and the theoretical basis and reference for improving the performance of the spiral centrifugal pump are obtained .

The main research contents of this subject are as follows :

1 . According to the structure characteristics of the spiral centrifugal pump and the characteristics of the two - phase flow field in the spiral centrifugal pump , the clearance flow between the hub and the back cover plate is neglected , the flow area of the spiral centrifugal pump is simplified , and the spiral centrifugal pump is divided into three areas of the inlet area , the impeller rotating area and the volute casing ;


2 . Using PRO / E to model a 150 脳 100LN - 32 screw centrifugal pump , we use ICEM to divide the three flow areas separately , and then import FLUENT for merging .


3 . The unsteady numerical simulation of 150 脳 100LN - 32 screw centrifugal pump is carried out by FLUENT software . The external characteristics and the internal flow field are analyzed , and the change law of the outer characteristic and inner flow field of the spiral centrifugal pump with the rotation of the impeller at different times is obtained .


4 . The internal multiphase flow field of 150 脳 100LN - 32 screw centrifugal pump was numerically simulated and analyzed by FLUENT software . The effects of different flow rate and different solid phase volume concentration on the internal flow field ( pressure , velocity and flow line ) were obtained .

The innovation points of this subject are as follows :

1 . The multiphase flow in the 150 脳 100LN - 32 spiral centrifugal pump is studied deeply , and the unsteady numerical simulation method for the internal flow field of the spiral centrifugal pump is put forward by using the Mixture multiphase flow model , the standard k 蔚 turbulence model and the slip grid technology .


2 . The pressure pulsation characteristic and axial force , radial force and so on of the screw centrifugal pump are obtained by setting the monitoring point method .

The conclusions of this subject are as follows :

1 . Through the unsteady numerical calculation of one cycle of the clean water medium under the rated working condition , the variation law of efficiency , lift , axial force and radial force with the phase angle of the impeller and the change law of the cross section pressure and the section flow line of the flow passage along with the rotation of the impeller at different times are obtained .


2 . Through the unsteady calculation of one cycle of sand - containing water at different flow rates , the pressure of the outlet surface of the volute , the axial force , the radial force and the torque of the impeller in one cycle are calculated , and the variation law of the pressure of the cross section in the working face , the back surface and the volute and the concentration of the solid phase at different times are analyzed .


3 . Based on the unsteady calculation of sediment concentration at different solid phase volume concentrations , the fluctuation law of the pressure , radial force , axial force , torque and the surface monitoring point of volute wall on one cycle are obtained . The variation law of pressure , velocity , solid phase volume concentration distribution and axial cross section flow line at different solid phase volume concentrations are analyzed .

【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH311

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前4條

1 常加富;文丘里洗滌器凈化生物質(zhì)燃?xì)饨褂吞匦缘难芯縖D];山東大學(xué);2013年

2 曾玲;螺旋離心泵內(nèi)氣固液三相非定常流動的數(shù)值計算與分析[D];蘭州理工大學(xué);2013年

3 高楊;螺旋離心泵啟動過程及軸向力特性的數(shù)值研究[D];蘭州理工大學(xué);2013年

4 趙文杰;導(dǎo)葉式螺旋離心泵內(nèi)固液兩相流動的數(shù)值計算與 分析[D];蘭州理工大學(xué);2013年

本文編號：1879340