[Sussex] data aquisition

[Rob Boss]

BRENDAN ET AL micro gas turbine general specs 100 to 200 k MAX rpm dependant 
on engine size ,
temps-
k couple territory exhaust gas temp 500C ish or less at nozzle or  a lot 
more! -with running problems e.g. under speed not sustaining quickly enough 
running rich if you like , overspeeding of course too much flow where 
general flow/ combustion dynamics allow or force /flame to leave combustion 
chamber towards and out of nozzle ect

one litre
kerosene consumed in about 7 mins approx depending on engine size

3 to one pressure ratio at the moment lot more possible theoretically .. 
another measurable data (case pressure)

opto sensors not as  good as magnetic surprisingly  for rpm measuring

fuel pump pressure upto 70 psi plus simple but very effective (model buggy 
speed type motor driven geared- pump above all the safest method so far.... 
no pressurised fuel cylinders !

turbo shafts turbofans props all running  very well plenty of extras  to be 
measured !

including afterburners ...

thrust measurement poss. with strain gauges or fishing balance!

vibration sensing future project

engines very well balanced with association designed balancer (open 
source)stay in balance well!

bearings ceramic balled full compliment angular contact bearings no cage 
total loss( premix) lube- best method
or case pressure fed reservoir (tricky metering )

thrust small engines in use at 5 lbs
up to larger units 150lbs plus

materials
TURBINE END
NIMONIC OR INCONEL lower powered older designs used twisted stainless 
sheet --and worked
COMPRESSOR
high tensile allminium early ones ply wood !
no other exotics apart from bearings and they wernt at first either !!

sound and smell like the real thing because they are!!!

 rob


----- Original Message ----- 
From: "Brendan Whelan" <b_whelan at mistral.co.uk>
To: "LUG email list for the Sussex Counties" <sussex at mailman.lug.org.uk>
Sent: Thursday, March 24, 2005 10:26 AM
Subject: Re: [Sussex] data aquisition


> Rob,
>
> Some further thoughts. By training I am a Chartered Mechanical Engineer 
> and,
> whilst well out of date on current engine technology, I do have a basic
> understanding of how engines work and the sort of data that you may want 
> to
> collect. The key question is how fast do you need to measure the
> information. For example, your may just want to measure steady state
> conditions i.e. when an engine is under constant load/speed conditions. Or
> are you trying to measure conditions during transients e.g. a steady speed
> increase. At the extreme you may want to measure pressure/temperature
> changes during combustion - but hopefully not. The speed of gathering 
> needed
> obviously will determine the type of IO card which you need and hence how
> much you have to pay.
>
> Hope that this helps and please ask if you want more thoughts, Brendan
> Whelan
> ----- Original Message -----
> From: "John Gregory" <john_gregory at onetel.com>
> To: "LUG email list for the Sussex Counties" <sussex at mailman.lug.org.uk>
> Sent: Thursday, March 24, 2005 9:54 AM
> Subject: Re: [Sussex] data aquisition
>
>
>> Rob
>> I can add my recommendation of Amplicon, having just used them when we
>> had an emergency with a failed I/O board. Their delivery of a
>> replacement was speedy.
>>
>> John Gregory
>>
>> Brendan Whelan wrote:
>>
>> > Rob,
>> >
>> > I had a look around a few weeks ago and found that
>> > quasarelectronics.com had a good range of IO cards, at low prices, -
>> > some with Linux drivers. A  member of the Brighton Linux Group
>> > recommended Amplicon, a local company, and someone else
>> > suggested http://www.comedi.org/ for the driver.
>> >
>> > Hope this gets you started, Brendan
>> >
>> >     ----- Original Message -----
>> >     *From:* Rob Boss <mailto:mapseast at tiscali.co.uk>
>> >     *To:* LUG email list for the Sussex Counties
>> >     <mailto:sussex at mailman.lug.org.uk>
>> >     *Sent:* Tuesday, March 22, 2005 9:23 PM
>> >     *Subject:* [Sussex] data aquisition
>> >
>> >     Does anybody have any data aquisition experience with linux
>> >     ?-software/plus ,suitable isolated hardware  for  temps/
>> >     pressures/freq/rpm,ect also some control outputs electric motors -
>> >     (as much as 6 amps possibly)+ switching of relays  realtime
>> >     rear-end seems to be correct ...for- engine monitoring + control
>> >     . I have done a small amount of  research but would love to hear
>> >     from someone with experience or knowlege or a prod in the right
>> >     direction
>> >     THANKS
>> >     Rob Boss
>> >
>>
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>> >
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>>
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