The influence of the radiator on the flow through an automotive cooling fan module was investigated using Laser Doppler Velocimetry for three different flow conditions. It is found that at the nominal design point, the radiator acts as an effective flow straightener. At low flow rates, fan induced pre-swirl is significant, but the radiator helps reduce reverse flow through the fan. Under ram air conditions the upstream inlet distortions persist through the module resulting in a highly distorted outlet flow.
An LDV Study of the Influence of the Radiator on a Cooling Module Fan
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Martinuzzi, RJ, Kopp, GA, & Havel, B. "An LDV Study of the Influence of the Radiator on a Cooling Module Fan." Proceedings of the ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. Volume 1: Fora, Parts A and B. Montreal, Quebec, Canada. July 14–18, 2002. pp. 1029-1035. ASME. https://doi.org/10.1115/FEDSM2002-31426
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