Radial and Tangential Flow Fans-An Alternative to Axial Flow Fans for Low Noise Automotive Cooling Systems

Investigations have been carried out into the suitability of radial flow fans as a replacement for axial flow fans. Project objectives were to reduce cooling system noise without increasing bulk volume or impairing efficiency. These considerations apply particularly to vehicles with engines of high output.

The application of tangential flow fans was also investigated and is covered in this paper. This type of fan may be better suited for radiators of low height and large width, typical of passenger cars with very low hoods.

As the radial flow fan satisfied requirements, further testing was carried out to acquire data for the layout of such cooling systems. All significant design characteristics and ambient conditions were taken into account.

Commercially available tangential flow fans did not provide improvements in either efficiency or noise. It is considered however, that development of rotor and air guiding walls may lead to the achievement of a satisfactory solution.