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RWDboy
Forums Junkie

Location:
South Australia
Registered:
July 2002

Re: Aerodynamics question.	Fri, 13 May 2005 16:42

Actually most top mount air-to-air intercoolers have their scoop placed around the halfway point of the bonnet, but generally not at the 'rear'. The rear of the bonnet is not really under much pressure and it's a region of very low air flow - this is partly why it's used to cool the in-cabin because it's not as likely to get extremely noisy at very high speed nor will it get turbulent. Air flow design is pretty interesting, I'm not a genius because I didn't study gas dynamics at university (I only did third year fluid mechanics which only covered newtonian and semi-newtonian 'liquid' flows and only briefly brushed on non-laminar flows) but the principles are similar. Generally windscreens are 'pitched' more vertically than the bonnet, thus the whole region under the line between the top of the windscreen and the very front of the bonnet has air flow which tends to move slower and slower as you get closer to the surface of both (and farther away from the high pressure points). The highest pressure points are right at the front of the bonnet, and right at the top edge of the windscreen. The reason bonnet scoops are raised is partly because they will catch more air if the frontal area is greater, but also because they need to be higher up (and further away from the bonnet surface) so they get good air flow and speed! The reason that most air vents are placed just behind the front lip of the bonnet is because usually the front bar is being used to scoop up air! If I am wrong, then I blame the lecture induced narcolepsy - because I slept through ALOT of lectures.... :S [Report message to a moderator]

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