Local improvement of flow and noise performances of axial-flow fans in a household refrigerator
نویسندگان
چکیده
In this paper, numerical and experimental investigations on an axial-flow fan with grooved/double-sectional blades are performed to improve its performance in terms of volume flow rate and noise at a local operating point. The target fan is used to cool a mechanical room of a household refrigerator. However, it is found that the target system has more resistance than that for which the fan is originally designed and the fan’s operating point is not optimal. First, the performance of the target fan unit is measured from the fan performance tester. Then, the P-Q curve is predicted using the virtual fan performance tester based on the CFD techniques to solve the incompressible RANS equations. The surface acoustic power of the fan unit is also predicted using the broadband noise sources modeled from the CFD results. The predicted P-Q curve is compared to the measured data, through which the validity of the numerical techniques is confirmed. On the basis of the prediction results, new fan units with modified fan’s housing structures are devised. Further predictions using these new fan units show that these fan units generate higher volume flow rate while keeping surface acoustic power levels lower than the existing fan system on the local operating point
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