turbo inlet placement

[royceso]

what is the optimal place to draw air from for the turbo compressor inlet, a high pressure area or a low pressure one? from seeing other turbocharged drag cars, it seems like opinions are split about 50/50. some cars draw air from the hoodline, a high pressure area, while other draw in air from the front bumper, a low pressure area. which placement do you guys think is better and why?

 

[patprimmer]

What data do you have to support your statement about which areas are high or low pressure.

I suspect that the pressure will be sensitive to exact placement and design, not just region, especially the hood line placement.

The pressure relativity will be speed dependant.

I think that the region of the bumper will be relatively high pressure at any speed, and will be cooler than the bonnet line placement.

I think if you remove a headlight and draw air through the headlight location, you will get a good supply of cold high pressure air.

The higher the air density the better.

Regards
pat pprimmer@acay.com.au
eng-tips, by professional engineers for professional engineers
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[GregLocock]

Looking at a plot of pressure around a car I've got to say the grill is a high pressure area. The bumper and hood line are as well.

Anyway, there is no doubt. A high pressure intake is a slight advantage.

Cheers

Greg Locock

 

[royceso]

I assumed that with a sleek enough nose the oncoming air would be cut cleanly and would not build up into a pressure front.

 

[GregLocock]

No

Cheers

Greg Locock