Shroud. Think blade tip losses. the air does not know which way to go
around the tips. A shroud tells them which way to go and increases the
total air movement in the direction we are interested in - through the
radiator.
KeithG
I have been told that I must shroud my electric puller fan to get
engine/engine bay temp down but I am having trouble understanding the
physics of this. I know shrouding is always done on new cars so one
would suspect that they know what they are doing.
If one considers a fan stuck in front of a rad it seems reasonable to
suppose it pulls air in through the rad in a profile almost exactly as
its fan blade coverage. Thus the rad not covered by the fan just has
air pushed over it by normal car motion. In other words how can the
electric fan, humping away pulling air through the rad core directly
in front of it, effect the flow of the non-covered area? What must
happen is that the shroud forces air to be pulled through the non-fan
blade covered areas at a FASTER rate than if they were left alone.
This points to the need for a sufficiently powerful electric fan. So
I suppose I should make a shroud. Does anyone know how to make a
shroud for a D&D Fabrications heavy duty rad and a Perma-Cool 19114
14" fan?
Regards
Barrie Robinson
barrie@look.ca
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