油烟机声学设计与试验研究

Acoustic Design and Experimental Study of Range Hoods

基于数值分析与试验方法开展油烟机声学优化与设计研究,采用大叶轮低转速的设计原则,针对叶轮宽度、叶片进出口安装角、蜗舌半径、叶轮蜗舌间隙、叶轮蜗壳轴向间隙等结构参数进行优化改进。CFD数值计算结果显示,在相同转速下改型机内部流场得到改善,回流现场有所降低,风量明显提升。对研制的改型样机进行噪声与风量风压测试,结果显示,改型机转速明显低于原型机,而风量风压与原型机基本相同,噪声降低了4.3 dB(A),不仅可以解决阵发性杂音问题,还可改善声品质。

Based on the numerical analysis and experimental test,the acoustic optimization and design of range hoods were carried out.The design principle of low speed large impellers was adopted.The structural parameters such as impeller width,installation angle of blade inlet and outlet,radius of volute tongue,clearance between the impeller and the volute tongue,axial clearance between the impeller and the volute were optimized and improved.The results of CFD numerical calculation show that the flow field inside the modified machine is improved at the same speed,the reflux field is reduced,and the air volume is significantly increased.The noise,air volume and pressure of the modified prototype were tested.The results show that the speed of the modified machine is significantly lower than that of the prototype,while the air volume and pressure is basically the same as that of the prototype.The noise is reduced by 4.3 dB(A),the problem of paroxysmal noise is solved,and the sound quality is improved.