摘要
各品牌的中央空调多联室外机均采用双风轮系统,都存在不同程度的低频脉动异音,异音呈低频特性,易让人产生烦躁感。双风轮系统在旋转基频比较接近的情况下运转时,旋转噪声叠加后产生拍振异音,其频率等于双风轮的旋转基频差。旋转噪声是拍振腹能量的主要来源。本文设计了新三叶风轮,采用新三叶风轮与原四叶风轮组合方式运行。同时测试两风轮的噪音频谱特性及气动性能,分析了两风轮的内流场,有效地消除了拍振异音,优化了整机性能。
The outdoor units of the Variable Refrigerant Flow air conditioning system manufactured by the top brands of the world are all using double-fan system. However, they generate varying degrees of pulsation noise, with the low frequency features making it easy for people to feel dysphasia. When the double fans operate at nearly the same Blade Passing-by Frequency, noise of beating vibration will be generated. Its frequency is equal to the difference of the blade passing-by frequency of the double fans. Rotated noise is the main source of beating vibration energy. This paper designs a new fan with 3-blades. The acoustic noise and the internal flow field characteristics of the newly designed 3-blades fan and the original 4-blades fan are analyzed. The results showed that it could eliminate the beating vibration noise by using one 3-blades fan and one 4-blades fan in the VRF air conditioning outdoor system. The volume flow and the refrigerant characteristic of the VRF also improved.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2011年第2期223-226,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.50720145604
No.50721005
No.50706013)
关键词
多联机
轴流风轮
拍振
双风轮系统
性能优化
VRF air conditioner
axial flow fan
beating vibration
double fan system
characteristic optimization
