导流罩对冰箱冷凝风机噪声的影响.pdf

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第50卷第12期
机械工程学报
Vol50 No12
2014年6月
JOURNAL OF MECHANICAL ENGINEERING
Jun
2014
DOI:10.390I/JMIE.2014.12.151
导流罩对冰箱冷凝风机噪声的影响
王正1刘志峰白连社2黄海鸿1罗健2
(1.合肥工业大学机械与汽车工程学院合肥230009;
2.合肥美菱股份有限公司合肥230601)
摘要:为研究不同的导流罩对冰箱冷凝风机噪声的影响,利用数值模拟的方法对风机在不同导流罩下的流动特性进行仿真,
得到不同导流罩下风机后缘涡流的分布,获取风机出口的湍流强度的变化特性,并进行相关的分析。通过试验验证表明,使
用封闭式导流罩时风机在较宽频带上的噪声都较使用半开式导流罩时高;封闭式导流軍下风机出风湍流强度更高,衰减速度
更快,噪声也更大;使用半开式导流罩时风机无论单独测试还是装机测试都可获取更低的噪声。同时,通过数值模拟和测试
的方法分析半开式导流罩的宽度对冰箱冷凝风机出口的湍流强度以及冰箱噪声的影响,得到风机噪声最低时的导流罩宽度。
冰箱冷凝风机在半开式导流罩下产生的湍流强度较低,相应的冰箱噪声也较低。
关键词:冰箱冷凝风机;导流罩;数值模拟:噪声
中图分类号:TK26
Effect of Deflecting Ring on Noise Generated by Axial Fan of
Condenser in Refrigerator
WANG Zheng LIU Zhifeng BAI Lianshe"HUANG Haihong LUO Jian
(1. School of Mechanical and Automotive Engineering, Hefei University of Technology, Hefei 230009;
2. Hefei Meiling Company Limited, Hefei 230601)
Abstract: In order to study the effect of the deflecting ring on the noise generated by axial fan for condenser in refrigerator,
numerical method is used in the simulation of the flow field generated by axial fan with different deflecting rings, Vortex exists in the
gap between blade top and deflecting ring has been acquired and characteristics of turbulence intensity in outlet of fan have been
analyzed. Some conclusions have been acquired with experimen al results. Compared with the semi-open type deflecting ring, noise
level of fan with closed type deflecting ring is much higher at multiple frequency bands; Turbulence intensity and its decreasing rate
in outlet of fan are much higher; Noise levels of single fan and refrigerator are decreased when semi-open type deflecting ring is used
In addition, effect of length of semi-open type deflecting ring on turbulence intensity and noise of refrigerator has been researched,
and optimal length for lowest noise level is acquired. Better flow and noise performance will be obtained when axial fan for
condenser in refrigerator is with semi-open deflecting ring
Key words: axial fan for condenser in refrigerator; deflecting ring; numerical simulation; noise
冷凝风机多放置在冰箱背部的下方,与外界环境之
0前
间仅以一层薄板相隔,且薄板上开设大量风口,使
得冷凝风机噪声向外界的传递更为容易,成为间冷
间冷冰箱因其无霜,制冷效率高,箱体内温度冰箱的主要噪声源之一。因此,冷凝风机的降噪硏
分布均匀等特点越来越受到市场的欢迎,各大冰箱究对于设计低噪声间冷冰箱具有十分重要的意义。
厂商也应市场需求推出了一系列的间冷式冰箱产
冰箱的冷凝风机一般采用低速轴流风机,其噪
品。间冷式冰箱,尤其是大容积的高端冰箱,由于声主要为由流动状态决定的气动噪声,取决于风机
性能要求增设了多个风机用于强制换热,导致噪声叶片几何参数及导流罩结构的共同作用,合理的叶
大幅提高,而过高的噪声成为消费者抱怨以及投诉片几何参数以及导流罩结构设计可有效提高冰箱冷
的主要问题之一。在间冷冰箱设置的多个风机中,凝风机的流动效率,稳定流场并降低风机噪声。
近年来,国内外学者对低速轴流风机的噪声进
*国家自然科学基金资助项目(51346004)。20130820收到初稿
20140109收到修改稿
行了大量的研究。王嘉冰等叫通过两种风扇扇叶研