Unsteady internal flow field simulations in a double suction centrifugal fan
Unsteady internal flow field simulations in a double suction centrifugal fan
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DOI：
10.1108/02644401311314321
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发表时间：
2013-11
影响因子：
1.6
通讯作者：
Jing Yang;L. Meng;Lingjiu Zhou;Yongyao Luo;Zhengwei Wang
中科院分区：
文献类型：
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作者：
Jing Yang;L. Meng;Lingjiu Zhou;Yongyao Luo;Zhengwei Wang
用途-火力发电厂有许多关于噪音和振动的问题。以往的研究表明，这类问题往往与球迷有关。然而，在实际测试中，很难对风机内部流动进行分析，从而找出风机振动和噪声的原因。为此，对离心通风机内部非定常流场进行了数值模拟，以确定其非定常源。本文旨在介绍这些问题。设计/方法/途径-采用SST k-ω湍流模型求解非定常雷诺平均Navier-Stokes方程，以模拟风扇整个流道内的流动。采用质量守恒方程和动量方程及能量方程求解流场分布。针对动力学问题，分析了叶轮上随时间变化的压力脉动。采用有限体积法和SIMPLEC算法对时间相关方程进行离散。对流项采用二阶迎风格式，中心差分格式采用二阶迎风格式。
Purpose – Thermal power plants have many problems regarding noise and vibration. Previous studies have shown that such problems are often related to the fans. However, the internal flows are difficult to analyze to find the cause of vibration and noise in fans in actual tests. Therefore, the unsteady internal flow field in a centrifugal fan was simulated numerical to identify the source. This paper aims to present these issues.Design/methodology/approach – The unsteady Reynolds‐averaged Navier‐Stokes equations with the SST k‐ω turbulence model were solved to simulate the flow within the entire flow path of the fan. The conservation of mass and moment and energy equations were used to solve the flow field distribution. The time‐dependent pressure pulsations on the impeller were analyzed for the dynamics problem. The finite volume method with the SIMPLEC algorithm was used to discretize the time‐dependent equations. The second‐order upwind scheme was used for the convection terms and the central difference ...