摘要
为探究机匣端壁槽结构对轴流通风机性能的影响,以单极轴流通风机为研究对象,采用大涡模拟对不同结构机匣通风机流场进行数值计算,并利用Lighthill声比拟法对其噪声进行预测。研究表明:机匣端壁槽结构,能够扰乱风机叶顶间隙内流场分布规律,阻碍泄漏流发展,致使风机全压值随着机匣开槽宽度增加而下降,但全压效率均有所提高;通风机近尾迹区涡量场最大值主要集中在叶顶区域,轮毂区域次之,设置合理端壁槽结构能够降低以上区域涡量值;机匣端壁槽结构对风机噪声有一定影响,其中方案2(开槽宽度为15mm)机匣风机噪声总声压值比原机匣风机降低(3.7~5.3)dB,降幅为(3~4)%。最后,利用声阵列对通风机近尾迹气动噪声测试,其结果与数值计算一致,验证了数值计算可靠性。其研究结果为轴流风机降噪设计提供设计基础和实验数据支持。
In order to explore the influence of end wall groove structure on the performance of axial fan,a single-pole axial fan was taken as the research object,and the flow field of different structure case ventilators was numerically calculated by large eddy simu-lation,and the noise was predicted by Lighthill sound analogy method.The research shows that the structure of end-wall slot can disturb the distribution rule of flow field in blade-top clearance of fan and hinder the development of leakage flow,resulting in the decrease of full pressure value of fan with the increase of slot width of casing,but the efficiency of full pressure is improved.The maxi-mum vorticity field in the near wake area of the fan is mainly concentrated in the top area of the blade,followed by the hub area.The vorticity value in the above area can be reduced by setting a reasonable end wall slot structure.The structure of end wall groove of casing has certain influence on noise of fan.Scheme 2 with 15mm slot,the total sound pressure value of noise of the casing fan is 3.7dB to 5.3dB lower than that of the original one,with a reduction of(3~4)%.Finally,the acoustic array is used to test the near-tail aerodynamic noise of the ventilator.The results agree with the numerical calculation and verify the reliability of the numerical calculation.The research results provide design basis and experimental data support for noise reduction design of axial fan.
作者
代元军
赵超
李保华
吴柯
DAI Yuanjun;ZHAO Chao;LI Baohua;WU Ke(College of Mechanical and Electrical Engineering,Xinjiang Agricultural University,Xinjiang Urumqi 830052,Chi-na;Mechanical College,Shanghai DianJi University,Shanghai 201306,China;College of Energy Engineering,Xinji-ang Institute of Engineering,Xinjiang Urumqi 830091,China)
出处
《机械设计与制造》
北大核心
2025年第11期284-288,294,共6页
Machinery Design & Manufacture
基金
新疆高校科研计划自然科学青年项目(XJEDU2021Y051)
新疆高校科研计划自然科学重点项目(XJEDU2019I027)。
关键词
轴流通风机
端壁槽机匣
泄漏涡
噪声特性
Axial Flow Fan
End Wall Groove Casing
Leakage Vortex
Noise Characteristics
