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Forum index » Science and Technology » Engineering » Mechanics
APU Already On Turbo Charged Engines
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Bret Cahill
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Joined: 05 May 2005
Posts: 480

PostPosted: Sun Nov 20, 2005 3:53 pm    Post subject: Re: APU Already On Turbo Charged Engines Reply with quote

< Can't come up with anything specific but in general----the

< (free) turbine of a gas generator (jet engine) could run in the

< vicinity of 17000 rpm (at 100% speed).

That's larger than the 3 - 10 hp size APU that would be useful on semi
rigs. Vehicle turbo chargers run at somewhat higher rpms -- 50 - 100K.
Tip speeds of flow machinery are typically in the transonic range
regardless of diameter. If you increase the diameter you reduce the
rpm.


Bret Cahill
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Bret Cahill
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Joined: 05 May 2005
Posts: 480

PostPosted: Sun Nov 20, 2005 3:35 pm    Post subject: Re: APU Already On Turbo Charged Engines Reply with quote

< Consider what reduction ratio you would need to drive a reciprocating


< compressor using the gas turbine.

It might be easier to have the turbine run a high rpm generator as well
as the centrifugal compressor then power everything electrically.

I just saw a system where the main engine was on line as usual but the
turbine powered a generator as well as the turbo compressor.

That engine would be easy to convert to APU only power. All you need
is a combustor, 2 bypass valves and some ducting.


Bret Cahill
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MLD
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Joined: 04 May 2005
Posts: 15

PostPosted: Fri Nov 18, 2005 11:33 pm    Post subject: Re: APU Already On Turbo Charged Engines Reply with quote

"N. Shamsundar" <shamsundar_at_@uh.edu> wrote in message
news:dlikfm$cla$1@masala.cc.uh.edu...
Quote:
Bret Cahill wrote:
I couldn't find anything on the web or the US patent office.


Bret Cahill

Consider what reduction ratio you would need to drive a reciprocating
compressor using the gas turbine.

N. Shamsundar
University of Houston

Can't come up with anything specific but in general----the (free) turbine of
a gas generator (jet engine) could run in the vicinity of 17000 rpm (at
100% speed).
MLD
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N. Shamsundar
science forum beginner


Joined: 10 Oct 2005
Posts: 40

PostPosted: Thu Nov 17, 2005 7:08 pm    Post subject: Re: APU Already On Turbo Charged Engines Reply with quote

Bret Cahill wrote:
Quote:
I couldn't find anything on the web or the US patent office.


Bret Cahill

Consider what reduction ratio you would need to drive a reciprocating

compressor using the gas turbine.

N. Shamsundar
University of Houston
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Bret Cahill
science forum Guru


Joined: 05 May 2005
Posts: 480

PostPosted: Mon Nov 14, 2005 3:40 am    Post subject: Re: APU Already On Turbo Charged Engines Reply with quote

I couldn't find anything on the web or the US patent office.


Bret Cahill
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Bret Cahill
science forum Guru


Joined: 05 May 2005
Posts: 480

PostPosted: Sat Nov 12, 2005 8:00 pm    Post subject: APU Already On Turbo Charged Engines Reply with quote

DOT or DOE wants to save billions in fuel every year by prohibiting
semi rigs from idling at stops. All they need to do is get some cops
to go to fuel centers and bang on cabs at 3 am.

Auxilary power units are considered too expensive for many owners so
the regulations stay off the books. Here's something that might be
cheaper and possibly aftermarket:

Instead of running the entire engine of large turbo diesel or gas
engines bypass the cylinders with ducting that goes straight from the
turbo compressor to the turbine then run the turbo part of the engine
to power a generator.

You would need to install:

1. bypass valves and ducting

2. a combuster w/fuel line

3. high speed air or electric starter

4. reducer gearing to power the ac compressor and/or alternator

5. possibly a regenerator


The thermo efficiency might not be too great but it'll last longer than
batteries and be more reliable than a small gas engine..


Bret Cahill
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