本文選題：迷宮螺旋泵 + 固液兩相流��； 參考：《北京化工大學(xué)》2011年碩士論文

【摘要】：本文簡要介紹了水煤漿技術(shù)的發(fā)展以及幾種水煤漿輸送泵的特點(diǎn),重點(diǎn)分析了迷宮螺旋泵的特點(diǎn)及其發(fā)展概況。為探明迷宮螺旋泵內(nèi)部固液兩相流動(dòng)的規(guī)律,本文選用MLB-170-0.5型雙端迷宮螺旋泵為研究對象,應(yīng)用FLUENT計(jì)算流體力學(xué)分析軟件及RNGκ-ε模型,對水煤漿高速迷宮螺旋泵內(nèi)部流場進(jìn)行數(shù)值模擬和仿真,得到了泵內(nèi)部壓力、速度、固相體積分?jǐn)?shù)、湍流強(qiáng)度和剪切應(yīng)力的分布情況,同時(shí)也對其內(nèi)部的顆粒磨損機(jī)理進(jìn)行了初步探討。 迷宮螺旋泵內(nèi)固液兩相流動(dòng)的規(guī)律：壓力從進(jìn)口到出口是逐漸增大的；在中間螺旋段部分,速度的軸向分布是一樣的,在周向上隨著軸徑的減小逐漸增大,在轉(zhuǎn)子螺紋槽處達(dá)到最大；固相體積分?jǐn)?shù)分布在徑向值相同的不同區(qū)域是有差別的,沿著螺旋半徑增大的方向逐漸增大,定子螺槽部分固相體積分?jǐn)?shù)達(dá)到最大；螺紋定、轉(zhuǎn)子間隙區(qū)域的湍動(dòng)程度最強(qiáng)烈,定、轉(zhuǎn)子螺紋槽根處的流體湍動(dòng)相對比較平緩；距定、轉(zhuǎn)子工作面較近的地方流體對壁面所產(chǎn)生的剪切應(yīng)力比較大,且固體顆粒相煤較液相水對工作面所產(chǎn)生的剪切應(yīng)力更大。 體積分?jǐn)?shù)相同、粒徑不同和粒徑相同、體積分?jǐn)?shù)不同兩種介質(zhì)下固相體積分?jǐn)?shù)和粒徑對兩相流規(guī)律的影響：粒徑相同時(shí),固相體積分?jǐn)?shù)越大,出口壓力越大,速度分布和湍流強(qiáng)度均沒有明顯變化,液相水的剪切應(yīng)力減小,固相煤的剪切應(yīng)力增大；固相體積分?jǐn)?shù)相同時(shí),顆粒粒徑越大,壓力和湍流強(qiáng)度不變,顆粒相速度減小,液相水剪切應(yīng)力增大,固相煤剪切應(yīng)力減小。 由模擬結(jié)果可知螺旋定子部分的固體顆粒體積含量較高,轉(zhuǎn)子螺槽部分顆粒的速度較高,由磨損率公式初步預(yù)測螺旋轉(zhuǎn)子受到顆粒的磨損比較嚴(yán)重,這就對轉(zhuǎn)子的材料和加工工藝有更高的要求。通過對水煤漿固液兩相流的數(shù)值模擬,得到了定轉(zhuǎn)子內(nèi)部流場的流動(dòng)情況,為迷宮螺旋泵的進(jìn)一步研究設(shè)計(jì)提供了理論依據(jù)。
[Abstract]:This paper briefly introduces the development of coal-water slurry technology and the characteristics of several kinds of water-coal slurry conveying pumps, and emphatically analyzes the characteristics and development of labyrinth screw pumps. In order to find out the law of solid-liquid two-phase flow in labyrinth screw pump, MLB-170-0.5 type double-end labyrinth spiral pump is chosen as the research object, FLUENT computational fluid dynamics analysis software and RNG 魏-蔚 model are used. Numerical simulation and simulation of flow field in high speed labyrinth spiral pump of coal water slurry are carried out, and the distribution of internal pressure, velocity, solid phase volume fraction, turbulence intensity and shear stress are obtained. At the same time, the mechanism of particle wear inside is also discussed. The law of solid-liquid two-phase flow in labyrinth spiral pump: the pressure increases gradually from the inlet to the outlet, the axial distribution of velocity is the same in the middle spiral section, and the axial velocity increases gradually with the decrease of axial diameter in the circumferential direction. The distribution of solid phase volume fraction in different regions with the same radial value is different, and gradually increases along the direction of spiral radius increase, the stator screw groove part solid phase volume fraction reaches the maximum. The turbulence in the rotor clearance region is the strongest, the fluid turbulence at the root of the screw groove of the rotor is relatively gentle, and the shear stress on the wall caused by the fluid closer to the rotor face is greater than that of the stator. And the shear stress of solid granular coal is larger than that of liquid water. The effect of solid volume fraction and particle size on the law of two-phase flow under the same volume fraction, different particle size and same particle size: when the particle size is the same, the larger the solid volume fraction is, the greater the outlet pressure is. The velocity distribution and turbulence intensity have no obvious change, the shear stress of liquid water decreases, the shear stress of solid coal increases, the particle size increases with the same solid volume fraction, the pressure and turbulence intensity remain constant, the particle phase velocity decreases. The liquid water shear stress increases and the solid coal shear stress decreases. According to the simulation results, the volume content of solid particles in the spiral stator is higher, and the velocity of the solids in the rotor spiral groove is higher. The wear rate formula is used to predict that the spiral rotor is seriously worn by the particles. This has higher requirements for rotor materials and processing technology. Through the numerical simulation of the solid-liquid two-phase flow of coal water slurry, the flow field in the stator and rotor is obtained, which provides a theoretical basis for the further study and design of the labyrinth screw pump.
【學(xué)位授予單位】：北京化工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH32

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