REFLECTOR: Advance Turbine Power ne Innodyn

[KeithHallsten]

The universal gas law is  P V = n R T.  We are looking at a change in
temperature due to a change in pressure and volume, so R, the universal gas
constant, and n, the amount of gas involved, can be dropped out.  We then
see that the product of pressure and volume is directly proportional to the
absolute temperature, assuming heat leaking out of the system is small
(which is reasonable because compression is very rapid).  We certainly
expect a significant reduction in volume with the 3.5 times increase in
pressure, so the increase in absolute temperature will be much less than the
compression ratio.

If we assume an initial temperature of 80 degrees F (about 540 degrees
Rankine), an increase to 750 degrees F (about 1210 R)  would be a factor of
2.2.   This would imply a change in volume of only 2.2/3.5 = 0.63 would be
associated with the 3.5 times increase in pressure, which seems
unreasonable.  I think the temperature difference is probably overstated, as
Richard implied.

Keith Hallsten


----- Original Message ----- 
From: "Richard Riley" <richard at riley.net>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Sunday, October 10, 2004 6:41 PM
Subject: Re: REFLECTOR: Advance Turbine Power ne Innodyn


> At 04:33 AM 10/11/04, you wrote:
> >  Then
> >consider that the
> >compressed air temperature at the 3.5:1 ratio is about 750 degrees F.
> >When the
> >ratio is increased the temperature goes up, the metal expands more and
> >will start
> >to become plastic. All the while spinning at 62,000 RPM - or more if
> >you want more
>
> Though I agree with you about Innodyn, are you sure about that
> temperature?  I mean, 1 atmosphere is 14.7 psi.  3.5 times that is about
52 psi
>
> And when I pump up my bike tires to 52 PSI, I don't *think* they're 750
> degrees F.
>
> RR
> (trying to remember the ideal gas law equation.)
>
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