基于流固耦合的大型卧螺离心机数值模拟及实验研究

摘要

采用ANSYS软件建立了卧螺离心机整机的流固耦合有限元模型，并通过流固耦合数值模拟分析得到了卧螺离心机负载工况下的滞后量、离心液压随转速变化关系以及转子系的真实应力状态。结果表明，离心机内部流场最大压力位于进料分布器出口段的转鼓内壁面处，转子系最大位移发生在螺旋输送器中部、最大应力位于螺旋叶片根部与螺旋筒体连接处，在正常工况下均满足强度、刚度要求；振动测试试验得到的临界转速与数值模拟结果相一致，验证了有限元模拟的准确性，并针对卧螺离心机独特的双转子结构提出测定副临界转速来推算临界转速的方法。

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	钟伟良
	谭蔚
	李振威
	李怀民
	刘丽艳

关键词：卧螺离心机； CFD模拟；流固耦合；转子动力学；振动测试

Abstract：

A finite element model of decanter centrifuge was established by ANSYS software. The centrifugal hydraulic pressure versus rotational speed and the stress state of the rotor system are obtained through the fluid solid coupling simulation. The maximum pressure of the internal flow field of decanter centrifugal is located in the inner wall of the bowl surface at the exit section of the distributor. And the maximum displacement of the rotor system occurs in the middle of the spiral and the maximum stress is located at the connection point of the spiral blade root and the spiral tube body. Afterwards, the numerical simulation results were certified with the vibration test. A new method for testing the critical speed of the double rotor of the decanter centrifuge is proposed.

Keywords： decanter centrifuge； CFD simulation； fluid-structure interaction； rotor dynamics； vibration test

Received 2016-04-08;

Fund:

国家自然科学基金（21376167）。

Corresponding Authors: 谭蔚,E-mail:wtan@tju.edu.cn。 Email: wtan@tju.edu.cn

About author: 钟伟良(1990-),男,硕士研究生,研究方向为过程设备流体流动、过程设备故障诊断。

引用本文:

钟伟良, 谭蔚, 李振威, 李怀民, 刘丽艳.基于流固耦合的大型卧螺离心机数值模拟及实验研究[J]. 化学工业与工程, 2018,35(2): 62-69

Zhong Weiliang, Tan Wei, Li Zhenwei, Li Huaimin, Liu Liyan.Numerical Simulation and Vibration Test Analysis of Large-Scale Decanter Centrifuge Base on Fluid-Structure Interaction[J]. Chemcial Industry and Engineering, 2018,35(2): 62-69

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