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#Post#: 259--------------------------------------------------
Reciprocating vs Turbine ??
By: crazyguy Date: August 19, 2013, 12:22 pm
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Which do you think is easier? wouldn't a turbine running at
around 1000 rpm then geared down, be simpler to drive a PMA?
#Post#: 260--------------------------------------------------
Re: Reciprocating vs Turbine ??
By: lynx wind Date: August 19, 2013, 1:46 pm
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Turbines for steam are the most common now. They are very
efficient and powerful. Until you get down in the lower Hp
size. Then the leakage past the vanes and housing become quite
large. You might see small little turbines buzzing at 10,000
rpm and it is quite fun. If it is efficiency you are after a
carefully designed reciprocating engine will do better at lower
Hp. These days the machining is so good my guess is the break
point for efficiency is around 30-40 hp.
#Post#: 262--------------------------------------------------
Re: Reciprocating vs Turbine ??
By: mad murdock Date: August 20, 2013, 1:25 pm
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I don't know how much power you would effectively extrac from
the passing gas (steam, air). In a turbine engine, the turbine
rotors and stators are designed to extract maximum energy from
the heated gas to the turning wheel, aerodynamics are utlized
extensively in the design to accomplish this task most efficient
way possible. I think though the coanda effect would be
present, it would not be very effective working against a smooth
surface. In the case of the paint roller, though covered in
paint, the pile on the roller acts as a resistive force to the
waterflow to transfer energy from the exiting water to the
rotating roller. If it was a smooth roller, I don't think you
would see the same results.
#Post#: 267--------------------------------------------------
Re: Reciprocating vs Turbine ??
By: lynx wind Date: August 20, 2013, 7:50 pm
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New Topic time CG
It's an interesting idea. Wind is free though.
Trying to get a lot of velocity from steam requires pressure.
Imagine how much steam it would take to disperse at pressure
over a 2' x 2' area. But if you just wanted to try a small
cross section it might be very interesting. Maybe a 4" diameter
x 2" high three to five blade turbine in a rectangular box. If
a VAWT can run at 2-4 times the speed of the wind, it might turn
quite fast in a high velocity flow of steam. Not many moving
parts.
#Post#: 271--------------------------------------------------
Re: Reciprocating vs Turbine ??
By: mad murdock Date: August 21, 2013, 8:43 am
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I see what you are getting at now, if it was something designed
to extract the energy from the gas flow, it may be worthwhile. I
was thinking it would be just a smooth spinning disk. What you
envision would be along the same principle of existing gas
turbine technology, the stators and rotors are designed to work
in concert to direct gas flow in such a manner to extract
maximum energy from the gas to the rotors as they pass each
stage through the turbine. Maybe a scaled down version of the
vawt that lynxwind had developed that has the stators on the
outside directing wind to the rotor on the inside. A lot would
depend on how you direct the gasflow(steam), onto the rotor. An
interesting idea.
#Post#: 5080--------------------------------------------------
Re: Reciprocating vs Turbine ??
By: keithturtle Date: January 9, 2015, 1:57 am
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Has anyone considered the small Tesla type disk turbine?
HTML http://opensourceecology.org/wiki/Tesla_Turbine
From what I've read, they use a tremendous amount of steam for
the power output. I guess the advantage is only one moving part
Turtle
#Post#: 6388--------------------------------------------------
Re: Reciprocating vs Turbine ??
By: Namtip Date: June 9, 2019, 10:03 pm
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It's a wonderful thing. I understand your principles.
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