Noise and Performance of Automotive Cooling Fans 800031

It is important to know the noise and performance characteristics of different engine-cooling-fan designs when making a selection for a particular application. Convenient parameters such as specific diameter, specific speed, efficiency and sound-power-level coefficient relate the geometrical performance and noise characteristics of a fan to the aerodynamic requirements of the system. Fan characteristics expressed in these parameters show clearly: the relationship between efficiency and noise; the effect of various geometric variables on efficiency and noise; comparisons of noise, performance, and other characteristics between different fan designs in performing a given pumping task.
GM Research studies show that the peak efficiency and minimum noise operating points of a fan do not necessarily coincide. Therefore, the judicious use of both noise and performance characteristics is important in selecting the best fan design for a given application. These studies also show that decreasing tip clearance, decreasing pitch angle, and increasing chord at a given solidity will increase fan efficiency, while decreasing tip clearance, optimizing pitch angle, optimizing camber, and optimizing solidity will reduce fan noise.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 43% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.