| The cross flow fan has the characteristics of simple structure,uniform air distribution,low noise and so on.It is widely used in the domestic air conditioner indoor unit.With the progress of society and the improvement of living standard,people’s demand for air conditioning performance is higher and higher.This is mainly reflected in the two aspects of flow and noise.Compared with the general power fan,air conditioning fan not only in the structure is very different,and its internal flow field unique eccentric vortex makes researchers can not rely on general similarity theory to design the cross flow fan.Instead,the design of the flow fan was carried out through engineering experiments,which will increase the cost.In this Paper,two-dimensional unsteady simulation of the internal flow field of the cross-flow fan is carried out by FLUENT software.The FW-H equation is used to solve the sound field of the cross-flow fan,and the internal flow field and sound field of different indoor air duct Parameters are analyzed.The purpose is to provide the basis for the design of the model.The main work of the Paper is as follows:(1)The numerical calculation model of the indoor air duct used is grid-independence in the grid density.Compared with the experimental results,the performance data of the air conditioning indoor unit and the measured value of the experiment are small,and within the acceptable error range,It can be seen that the calculation method and model used in this Paper can reflect the flow field of indoor air duct more effectively and can be used to optimize the flow field of indoor air duct.(2)Using FLUENT software to simulate the flow field and sound field of the changed inlet Parameters of the indoor air duct.The influence of the deflection angle,the opening degree and the thickness of the guide plate on the flow field and sound field of the indoor unit were studied.It is found that when the inlet deflector is deflected 15 degrees,the noise value is lowest and the performance is reduced at least.The inlet angle increases,the flow rate and noise increase first,and then decrease.With the increasing thickness of the inlet deflector,the flow and noise decrease.(3)FLUENT software is used to simulate the flow field and the sound field of the changed internal Parameters of the indoor air duct.The influence of the distance between theheat exchanger and the front Panel,volute tongue clearance and the diameter of the impeller and the length of the outlet-chassis on the flow field and sound field of the indoor air duct were studied.With the increase of the minimum distance between the heat exchanger and the front panel,the flow rate increased,the noise increased first and then decreased;with the increase of tongue clearance,the flow is reduced,the noise increased first and then decreased,and then increased;the length of the outlet-chassis increased,the flow increased,and the noise increased first and then decreased.(4)Comprehensive analysis of structural Parameters.In order to optimize the performance of the indoor unit,the analysis of the main Parameters of the indoor unit.Using the orthogonal test method,the factors of the angle of the guide,the thickness of the guide,the distance between the heat exchanger and the front plate,the clearance of the cochlear tongue and the length of the outlet chassis were analyzed.It is found that the volute clearance has a significant influence on the coefficient of performance;the volute clearance and the length of the outlet-chassis have the same influence on the noise of the indoor air conditioner. |
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