【作者】 杨柳；

【导师】 陈扬枝； 朱旭；

【作者基本信息】 华南理工大学 ， 工程硕士（专业学位）， 2018， 硕士

【摘要】 离心风机广泛地应用于各行各业,是重要的工业生产设备,目前国内的研发水平与国外仍有较大差距,系列化设计能力的不足限制了风机行业的发展,国内生产的风机设备尚不能完全满足各行业的生产需求。为了突破这种限制,本文研究了悬臂式多级离心机的系列化设计理论及应用。本文在前人研究成果的基础上,研究建立了悬臂式多级离心风机的系列化设计理论和方法,并完成了该类型风机结构的参数化设计软件。根据试验数据建立了符合悬臂式多级离心风机流动特性的损失模型,包括叶轮内的流动损失、弯道和回流器中的损失、蜗壳中的损失、进气室和出气室中的损失,以及变工况时的冲击损失,利用MATLAB软件平台,完成了风机变工况性能预测软件的开发,并应用该软件完成了多个型号风机的性能预测。本文建立了风机内部流道实体模型,通过数值分析研究得到了结构参数对风机效率的影响规律。利用商业CFD数值计算软件,对风机内部流场进行全三维数值模拟,对计算结果进行分析,发现通过参数化设计完成的风机内部流场分布合理,结合本文开发的风机性能预测软件,研究得到了部分结构参数的变化对风机性能影响的规律,包括回流器叶片出口角以及叶轮叶片入口角的影响。具体的,减小回流器叶片出口角会使风机压力和功率下降,减小叶轮叶片入口角会使风机最高效率点向小流量方向移动,且风机的压力-流量曲线会变得更加平缓。这些研究结果对悬臂式多级离心风机的结构设计及系列化设计具有实际指导意义。本文根据所建立的风机设计理论,成功设计了三台风机产品,并按实际生产需求进行了样机性能试验。具体地,通过不同叶轮级数、叶轮直径、叶轮宽度、转速的组合,完成了风机产品线的布局及系列化设计,并通过试验测试验证了性能预测软件计算结果的可靠性和设计理论的正确性。目前,部分产品已经应用于公司的生产线中。更多还原

【Abstract】 Centrifugal fan is widely used in various industries,is the important industrial production equipment.It occupies an important position in the development of social production.At present,there is still a big gap between the domestic and abroad on the development of research level.The domestic production of fan can not fully meet the production needs of various industries,and the lack of serialized design capabilities limited the development of the fan industry.In order to overcome this limitation,this paper studies the seriation design theory and application of cantilevered multistage centrifugal fan.This paper has established the seriation design theory and method for cantilevered multistage centrifugal fan on the basis of predecessors’ research results,and completed the structure parametric design software for this type fan.By analysis the test data,build a loss model witch is conform to the flow characteristics of this type fan.The losses include the flow loss in the impeller,loss in the bends and refluxers,loss in the volute,loss in the inlet and outlet chambers,and the impact losses in changing conditions.Compiled the fan performance prediction software conversion by using MATLAB software platform,and predicted the performance of multiple models of fans in the performance prediction software.This paper has compiled full three-dimensional numerical simulation for the fan by using commercial CFD numerical calculation software ANSYS,and use CFD-POST for post-processing,which shows that the fan’s internal flow field is reasonabl.And studied the effect of the change of structural parameters on fan performance,which is reducing the outlet geometry angle of the reflux device blade will reduce the pressure and power of the fan,and decrease the inlet geometry angle of the impeller blade will cause the highest efficiency point of the fan to move in the direction of small flow and the pressure-flow curve of the fan will become more gentle.These research results has practical guiding significance for the structural design of the multistage centrifugal fan.Based on the fan design theory established by this paper,successful designed three kinds of fan products,and test the performance of this fan according to the actual production demand.In particular,the series design were completed through the combination of different impeller stages,impeller diameter,impeller width,and rotation speed.And through experimental tests,verified the reliability of the calculation results of the performance prediction software and the correctness of the design theory.At present,some products have been applied to the company’s production line.更多还原