扩散器结构参数对农用轴流风机性能的影响  

Influence of diffuser structure parameters on the performance of agricultural axial fan

作　　者：李松 施正香[1,3] 王康乐 孔维双 丁涛 LI Song;SHI Zhengxiang;WANG Kangle;KONG Weishuang;DING Tao(College of Water Resources and Civil Engineering,China Agricultural University,Beijing 100083,China;Beijing Engineering Research Center of Safety and Energy Saving Technology for Water Supply Network System,Beijing 10083 China;Key Laboratory of Agricultural Engineering in Stucture and Environment of Ministry of Agricuture and Rural Affairs,Beijing 100083,China;Baicheng Branch,Beijing First Agricultural Animal Husbandry Development Co.Ltd.,Baicheng 137000,China)

机构地区：[1]中国农业大学水利与土木工程学院,北京100083 [2]北京市供水管网与安全节能中心,北京100083 [3]农业农村部设施农业工程重点实验室,北京100083 [4]北京首农畜牧发展有限公司白城分公司,吉林白城137000

出　　处：《中国农业大学学报》2021年第5期163-174,共12页Journal of China Agricultural University

基　　金：国家重点研发计划(2018YFF0213604);国家奶牛产业技术体系(CARS-36)。

摘　　要：针对农用轴流风机通风量小、能效比偏低的问题,以ATK48HS3P1H型农用轴流风机为研究对象,采用风室试验、逆向建模、CFD数值模拟等方法,对扩散器扩散角(φ)和长度(L)对风机风量(Q0)和能效比(N)的影响进行研究。结果表明:1)扩散器的静压恢复系数(CP)随着φ的增大先增大再减小,扩散器风速分布均匀度(γ)随φ的增大上下波动,风量优化量(τ)随着φ的增大呈先增加而后缓慢下降的趋势,N曲线的变化趋势整体与τ的趋势一致,φ=12°时CP、γ、τ、N同时取得较大值;2)当L=575mm,φ为3°~25°时,τ和N随着φ的增大先增大再减少,φ=12°时同时取得较优性能;当φ=12°,L为485~665mm时,随着L的增大τ和N呈现先增加再减小的趋势,当L=575mm时同时取得最大值;3)交叉模拟试验证明φ=12°,L=575mm是该扩散器的最优参数,此时较原型风机Q0提高了6.11%,N提高了7.83%。Aiming at the problems of small ventilation and low energy efficiency ratio of agricultural axial fans,ATK48 HS3 P1 Hagricultural axial fan was taken as the research object.The influence of diffuser angle(φ),length(L),air volume(Q0)and energy efficiency ratio(N)were investigated by means of wind chamber test,reverse modeling and CFD numerical simulation.The results show that:1)The static pressure recovery coefficient(CP)of diffuser first increases and then decreases with the increase ofφ.The wind speed distribution uniformity(γ)of diffuser fluctuates up and down with the increase ofφ.The optimized air volume(τ)first increases and then decreases slowly with the increase ofφ.The trend of N curve is consistent with that ofτ.CP,γ,τ,and Nreach larger values atφ=12°.2)When L=575 mm andφis between 3°and 25°,τand Nfirst increase and then decrease with the increase ofφ,and better performance is achieved atφ=12°.Whenφ=12°and Lis between 485 and 665 mm,τand Nincrease first and then decrease with the increase of L,and reach the maximum at 575 mm.3)Finally,cross simulation is used to verify thatφ=12°and L=575 mm are the optimal parameters of the diffuser.The fan air volume increases by 6.11%and the energy efficiency ratio increases by 7.83%.The research shows that the evaluation of diffuser performance should be comprehensively analyzed from four aspects:static pressure recovery coefficient,wind speed distribution uniformity,air volume optimization and energy efficiency ratio.

关 键 词：农用轴流风机 扩散器 优化设计 数值模拟 

分 类 号：S237[农业科学—农业机械化工程]