【摘要】：螺旋卸料沉降離心機是利用離心沉降原理對非均相混合物進行分離的機械設備，具有連續(xù)送料、處理量大、耗電量少、適應性強等特點，因此，在工業(yè)生產(chǎn)中應用非常廣泛。近年來隨著科學技術的發(fā)展，沉降離心機的研制也得到了較大的發(fā)展，特別在結(jié)構(gòu)和品種上發(fā)展較為迅速，但在對螺旋卸料沉降離心機內(nèi)部流場理論方面的研究還相對比較薄弱。 本文先應用三維設計軟件Solidworks對LWB350型臥式螺旋卸料沉降離心機零部件進行三維實體建模，并在Solidworks裝配體模塊中完成整機的虛擬裝配。 根據(jù)臥螺離心機物料的流動特點，對流動域作了合理的簡化，應用計算流體動力學軟件Fluent對其進行了數(shù)值模擬研究。通過比較不同湍流模型的適用范圍和計算需求，選擇了雷諾應力模型進行求解計算。在深入了解臥螺離心機的基礎之上，模擬研究了不同參數(shù)情況下的流場，，得到了離心機流場的靜壓、動壓以及速度分布。在此基礎上，針對離心機處理的懸浮液固相體積分數(shù)小于10％的情況，選擇離散相模型分析液固兩相流動。 根據(jù)離心機內(nèi)固液分離過程的數(shù)值模擬分析結(jié)果，探討流量、轉(zhuǎn)速等參數(shù)對分離效果的影響；并完成臥螺離心機生產(chǎn)能力的相關計算。
[Abstract]:Spiral discharge settling centrifuge is a mechanical equipment which uses centrifugal settlement principle to separate heterogeneous mixtures. It has the characteristics of continuous feeding, large amount of treatment, less power consumption, and strong adaptability. Therefore, it is widely used in industrial production. In recent years, with the development of science and technology, the development of settling centrifuge has also been greatly developed. Especially in structure and variety, the research on the internal flow field of helical discharge centrifuge is relatively weak.
This paper first uses three-dimensional design software Solidworks to build 3D solid modeling of LWB350 horizontal spiral unloading centrifuge parts, and complete the virtual assembly of the whole machine in the Solidworks assembly module.
According to the flow characteristics of the material of the snail centrifuge, a reasonable simplification of the convective domain is made. The numerical simulation study of the fluid dynamics software Fluent is carried out by using the computational fluid dynamics software. The Reynolds stress model is selected for the calculation by comparing the applicable range of the different turbulence models and the calculation demand. The flow field under different parameters is simulated and the static pressure, dynamic pressure and velocity distribution of the centrifuge flow field are obtained. On this basis, the discrete phase model is selected to analyze the liquid solid two phase flow in the case of the volume fraction of the solid phase of the centrifuge treated by the centrifuge is less than 10%.
According to the numerical simulation analysis results of the separation process in the centrifuge, the influence of the parameters of the flow and speed on the separation effect is discussed, and the related calculation of the production capacity of the decanter centrifuge is completed.
【學位授予單位】：遼寧科技大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH244

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