摘要
针对吸油烟机用多翼离心风机设计了内凹弧形、内凹槽形2种内凹式蜗舌,采用实验测量和数值模拟方法研究了内凹式蜗舌对多翼离心风机气动性能和噪声的影响。与传统的原型蜗舌相比,采用内凹式蜗舌在风机出口压力和运行效率基本保持不变的情况下,叶轮出口气流对蜗舌的冲击强度减小,蜗舌处流场的逆压梯度降低,使得风机气动噪声下降。实验结果表明:与原风机相比,带有内凹弧形蜗舌和内凹槽形蜗舌的多翼离心风机的噪声分别下降了1.4dB和1.7dB;同时,由于内凹式蜗舌能够抑制流动分离,使风机出口处的有效流通面积增大,蜗舌附近区域的旋涡强度及其影响区域减小,从而增加了多翼离心风机的流量。
Two types of volute tongue are designed for a multi-blade centrifugal fan used in range hoods.One is an inner concave arc volute tongue and the other is an inner concave grooved volute tongue.The effects of the inner concave volute tongues on both the aerodynamic performance and the noise of the multi-blade centrifugal fan are studied by using the measurement and numerical simulation methods.Compared with the traditional tongue,the impact of the air flow discharged by the impeller on the surface of the volute tongue is weakened and the inverse pressure gradient of the flow field near the volute tongue is reduced when the inner concave arc and the inner concave grooved volute tongues are used.Under the condition that the total pressure and operating efficiency of the multi-blade centrifugal fan keep constant,the aerodynamic noise is reduced.Experimental results show that the sound pressure level of the multi-blade centrifugal fans with the inner concave arc volute tongue and the inner concave grooved volute tongue goes down by 1.4 dB and 1.7 dB,respectively.At the same time,the effective flow area at the fan outlet increases because the flow separation occurred near the volute tongue is suppressed.The vortex intensity and the corresponding influence area are reduced.These results show that the flow rate of the multi-blade centrifugal fan with the concave volute tongues effectively increases.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2017年第12期128-135,共8页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(51676152)
陕西省科学技术研究发展计划资助项目(2014K06-24)
关键词
多翼离心风机
蜗舌
气动性能
噪声
数值模拟
multi-blade centrifugal fan
volute tongue
aerodynamic performance
noise
numerical simulation
