Another article on Radiator ducts, is about aeroplanes, but principles are the same, thought it best to tag on this thread:
Contrails ! Radiator aerodynamics
Regarding adjustment of mass flow, thought this comment was relevant:
Quote:
In theory, it should be necessary to alter the intake opening at the same time as the exit.
In practice, it has been shown that once the intake cross section is 30 to 50% of the radiator block frontal area, the volume flow depends only on the exit area.
Hence the regulation by control of the exit area by means of cowl flaps, preserving the static pressure at the front face of the radiator.
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