Generative Design Research Of Cross-flow Fan For Tower Fan Based On Computational Fluid Dynamics

With the rapid development of the Internet,users have higher requirements for quality of life and more subdivided demands.Every household appliance company develops at least one new product every year.Most household appliances that use crossflow fans generally require high comprehensive performance of wind speed,air volume and noise,so the research of such products has been the focus and difficulty of research and development.However,most of the small and medium-sized enterprises manufacturing tower fans have weak research and development capabilities,and most of the actual design and production rely on imitating ready-made products,lacking theoretical basis,resulting in a long research and development cycle and high cost.At present,the research on cross-flow fans are more focused on large electrical appliances,and the literature records applied to tower fans are relatively few.Therefore,how to coordinate the complexity and implementation of design in as short a time as possible is of great application significance to the development of small appliance fan industry represented by tower fan.This paper presents a creative design method to explore and evaluate the design space of fan for small household appliances.This approach can help designers gain new structures beyond their experience and has the potential to expand the diversity and quality of design results,bringing innovation to small appliances.In this paper,taking the Tower fan for example,creative design scheme is set as the experimental group,and the design ideas commonly used by enterprises as the control group.The experiment verifies that this method can faster output optimization scheme,save costs and research and development cycle,compared with the traditional scheme.In the future,it can be extended to humidifier,air purifier and other small household appliances,providing theoretical research and development basis for small and medium-sized enterprises in the industry.The full paper is summarized as follows:Firstly,the geometric parameter model is constructed.The parameter set of the experiment is defined in detail,and a program is written for automatic model generation,which is helpful for batch generation of multiple scheme models.Secondly,fluid simulation modeling,that is,CFD simulation.The unsteady k-εturbulence model combined with the broadband noise model and unsteady large Eddy simulation combined with the Fortzwilhelm-Hawkins equation were constructed.At the same time,the automatic script generated by the model is combed to save time.Then,the tower fan innovative scheme generation design.At first the influence mechanism of structural parameters,such as blade number,volute gap,ratio of the inside diameter to the outside diameter and volute gap,on the performance of cross-flow fan was studied by means of steady simulation model.Then the orthogonal experiment was used to optimize the structure,and a multi-objective optimization scheme based on noise and flow was proposed and the performance was simulated.A certain number of optimization schemes were screened based on optimization objectives and priority of objective variables.Finally,complete a two-step performance evaluation.The unsteady simulation model is used to evaluate and verify the air volume and noise performance,and verify again whether the optimal scheme meets the expectation.The prototype of the optimal scheme is printed and the actual test of air volume and noise is carried out in the air volume chamber and semi-muffler chamber.The experimental results show that compared with the original tower fan model,the flow rate of the optimized design scheme increases by 0.53% and the noise is reduced by 2.29%.Compared with the traditional design method,this method can effectively save cost and shorten the development cycle.