机械通风直接空冷系统噪声预测与分析
摘要：直接空冷系统采用大型轴流风机群对汽轮机排汽进行冷却，因此直冷系统噪声成为电站主要考虑的问题之一。该文利用计算流体软件Fluent对直接空冷单元和5×6规模的空冷岛进行流场模拟和噪声预估，并模拟增加消音墙后的空冷岛流场和噪声的变化情况。流场模拟的紊流模型采用大涡模拟（large eddy simulation，LES），噪声预估采用非稳态隐式求解。结果表明，在挡风墙内侧布置多孔吸声材料对空冷岛流场基本没有影响，但是它可以有效降低整个空冷岛的噪声水平，主要是降低了低频率的噪声。
Abstract:Direct dry cooling system adopts large-scale axial flow fan group to cool exhaust steam of turbine. So the noise of direct dry cooling system becomes one of the hazards of power plants. By using computational fluid dynamics software Fluent, the simulation of flow field and noise forecast of direct dry cooling cell and system were performed in this paper. The changes of flow field and noise of ACCs (air-cooled steam condensers) were simulated after increasing the noise reduction wall. The large eddy simulation was applied to analyze the flow field. Noise forecast was proceeded by means of the unsteady and implicit solver. The results show that the porous sound-absorbing materials decorated inside the wind wall have no effect on the flow field of ACCs. But they could effectively reduce the noise level of ACCs, especially reducing the low frequency noise.
标题：机械通风直接空冷系统噪声预测与分析
title:Noise Prediction and Analysis of Mechanical Draft Direct Dry Cooling System
作者：崔超,赵允涛,黄文慧,杨立军
authors:Chao CUI,Yuntao ZHAO,Wenhui HUANG,Lijun YANG
关键词：直接空冷,风机,流场模拟,噪声预测,降噪措施,
keywords:direct dry cooling,axial flow fan,flow field simulation,noise forecast,noise reduction measures,
发表日期：2018-10-30
- 文件大小:
- 578.19 KB
- 下载次数:
- 61
-
高速下载
|
