h a l f b a k e r y
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A two stroke internal combustion engine, where fuel is
injected using high pressure air injection, along with
pressure pre-compressed air. The fuel-air is ignited, and
the piston pushed.
During the "compression" cycle the piston only pushes
the fumes, without compressing air
for the next cycle.
Essentially this works like a four stroke engine with the
induction and compression strokes removed.
This is a solution for smaller "home based" low cost wind
Using plastic pipes inserted in the ground high pressure
compressed air is accumulated from 15-50 kw wind
turbines. Then used to enhance an engine with a small
amount of fuel retrieving much of the energy from the
pneumatic stored power.
For better efficiency a slow diesel engine could be used.
This compressed air is then used to generate electricity
using the Compressed Fuel-Air Engine.
Air Hybrid engine
[The_Saint, Mar 11 2011]
Compressed air 2 stroke diesel [Twizz, Mar 11 2011]
With a separate cylinder for compression. Makes for much higher efficiency. [pashute, Aug 22 2011]
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||Wouldn't it be cleaner to use the air alone in an air motor?
||Baked except for the specific air pressure source:
||The opposed piston 2 stroke diesels used in the Commer vans used a cycle as described. They had an engine driven compressor, but a static version could use any air supply.
||The opposed piston engine has the advantage of improved scavenging. With the exhaust ports at one end of the cylinder and inlet at the other, there is very little mixing.
||we make the engine more efficient by getting elves to do part of the work.
||So this is a spark ignition setup then?
||To get significant power out of this you'd need to be compressing to a fair pressure. Filling the cylinder to 12bar would give you more or less equivalent to a NA petrol engine for start-of-combustion conditions (and therefore power availablility).
||The worry for me would be the losses through your inlet system, to charge the cylinder from TDC you'll need a large flowrate through your intake valves.
||Ldisch, air engines are extremely inefficient , WCW
please add a + to the community of ridiculing, Twizz
and Saint - thanks(!) I'm looking into those. I just
contacted Scuderi, getting them interested in
renewable wind energy. I'll post here if any advance.
||pashute how it the world does it make sense to use a perfectly good source of energy like a wind turbine to "increase the efficiency" of a diesel piston engine. It's like throwing light bulbs on a fire to make it brighter.
||Not exactly. It's using much less gas. It's like
fanning air at a low burning fire to get big flames.
||Turns out this idea is deeply baked at large-scale
at least. Just re-read CAES carefully on wikipedia.
They use the compressed gas in the gas turbine of
||So my proposal is to downscale it. Then anybody
who has a small roof for solar power or a fair wind
for a wind turbine, can
store power without batteries, and get back its
worth, when you need it.
||Perhaps it would even be worth buying low rate
nighttime electricity and then creating your
needed electricity yourself in the daytime!
||I agree that "use forced induction" isn't an idea with even a spark of novelty. Storing the motive energy from a turbine in a pressurized gas is also not a new idea. Where we part ways is with the notion of using that perfectly good stored energy to "help" a system that needs no help at all. The energy you will waste "boosting" your diesel generator would yield less than you would gain by using it to directly power a small generator and far less than you would gain by using a turbocharger or a conventional induction diesel motor. Induction represents only a very small inefficiency in the overall inefficiency of an internal combustion engine.