<VV> Flow/Pressure/Cooling

[jvhroberts at aol.com]

 Exactly, Joel. In fact, air doesn't exceed the speed of sound inside the turbocharger! 

Of course, the square root relationship remains between flow and pressure as long as the flow regime doesn't change significantly. 

Another note: At these pressure ratios, compressive heating is practically nil. However heating due to extreme inefficiencies is consequential. All that lost HP winds up as heat, as you mentioned. 

 

John Roberts
 

 

-----Original Message-----
From: Joel McGregor <joel at joelsplace.com>
To: virtualvairs <virtualvairs at corvair.org>
Sent: Thu, May 24, 2012 12:25 pm
Subject: Re: <VV> Flow/Pressure/Cooling


You're talking about a situation way outside of anything a Corvair cooling 
system would encounter so it doesn't have any relevance to the subject at hand.  
Or are you claiming that we could force enough air through Corvair heads to 
produce more heat?   Or that the cooling air we are dealing with could reach the 
speed of sound?  I know I'm half deaf but I would imagine even I could hear 
that.
I would bet that "the dynamics and thermodynamics of supersonic and hypersonic 
fluid flow" don't apply at all to what we are talking about.
Joel McGregor

________________________________________
From: James Davis [jld at wk.net]
Sent: Wednesday, May 23, 2012 11:25 PM
To: Joel McGregor
Subject: Re: <VV> Flow/Pressure/Cooling

It is a basic law of closed channel fluid flow in fluid dynamics that
you cannot exceed the speed of sound in the closed channel.

Second answer when you try to force more fluid in a pipe than it can
flow, the the extra energy becomes heat.

All this leads to the reason "the dynamics and thermodynamics of
supersonic and hypersonic fluid flow" is a graduate level course in aero
engineering.

Jim Davis
a very old aero engineer
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