Modification and evaluation of an automotive cooling axial flow fan noise prediction model
Keywords:Acoustic noise, Axial flow, Fans, Machine design, Automotive cooling axial flow fan noise prediction model
AbstractThe intention of this paper is to demonstrate the feasibility of a noise prediction model recently proposed for use in determining the sound pressure level spectrum of axial flow fans for an automotive cooling application. The predictions of the noise model, based solely on blade geometry and operating conditions, were compared with numerous empirical studies, one of which is presented here. The model is shown to be very effective in the absence of secondary sources of noise, such as blade corner details and the fan hub, while being totally ineffective when these sources are not negligible. Furthermore, in a fractional design of experiment, the model is used to predict the three most important geometrical parameters to consider in fan design. From the point of view of quietness, these parameters are overall fan radius, chord width and rotational speed.
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