But crazy mad scientist question of the day is, what if we combined them??
I think we need a little explanation of what’s going on here.
(1) since a jet engine can’t burn solids like wood, we’ll go ahead and toast that up as normal in a rocket stove. Also like a normal rocket stove (2) the now gassified output (mainly “wood gas” along with other unburned material such as creosote) continues to burn. (3) The exhaust from this spins a set of blades, which turn a shaft (4) before exiting the “stove” as normal.
So far all we’ve really gained over a standard rocket stove is a spinning shaft. Now comes the magic. First, we drive a second fan (5) to suck more air in. This results in an even hotter, faster, and more complete burn. Finally (6), if we crudely photoshop a DC motor (aka, generator) onto that, we can get useable electricity! Hurray!
As more load is applied to the generator, it would slow the turbine, thus decreasing exhaust draft. With a little bit of electronical smarts, this could be regulated on purpose to extract the maximum amount of energy from the system while maintaining flow.
Furthermore, since the generator can also be run as a motor, the electronics could feed input power so that a proper draft is present during start-up. No more need to fiddle around with pre-warming and no more accidental back-burns filling the house with smoke.
1. More oxygen present would combust hydrocarbons even more thoroughly, and faster, than traditional stove.
2. Cheaper, and likely more efficient, conversion to electricity than TEG devices.
3. Can probably be made from salvaged materials. (I picture, perhaps, an automotive starter motor as the generator?)
1. Wood burns differently than jet fuel, and designing a decent turbine may take a lot of engineering & experimentation. (Though even this may be more accessible than it sounds as hobby turbine implementations abound online. [ example ])
2. Certainly more complex than a standard rocket stove.
3. Contains high heat, combustion gak, and moving parts and therefore will certainly require maintenance of some kind.
4. No idea what kind of noise this would make.
Final Note: FYI, This is a re-post from my projects blog, here.
Jet fuel can be injected with compressor (pressure needs to be far below that of the inside of the turbine). A rocket stove pretty much has atmospheric pressure… your contraption would blow the fire out of the front.
If the wood was inside a closed chamber that can be pressurized and heated from an outside source… maybe?
Maybe combining a rocket stove, wood gasifier (pyrolysis), and a jet turbine of some sort might produce lots of power? I like you’re thinking beyond the box ideas. Keep them coming if so inclined.
Someone with a machine shop could build a great turbine generator I think.
Maybe an automotive turbo charger? All the mechanics are built in. An air pump to push boosted air into the system. That air impeller could boost the air as well as hold the shaft for the electrical generation pulley.
They sort of make what you are proposing, but it is radically different in how it looks and works.
It is called a Liquid Bottom Boiler, and it uses injected air to suspect the fireball off the bottom of the boiler. It is so stupid hot that there is no grates or ash. As the fuel is dumped into the liquid bottom boiler, it is instantly consumed...and this can be any type of fuel after it is initially lit with natural gas. Wood, coal, tires, anything. It is said to burn things that will not even burn, it is so hot.
The ash then rises out the smoke stack, but before it does, it goes through a series of small cyclones, that remove the heavier fines. These get returned to the bottom of the boiler for reburn, and thus the cycles continues again and again until the impuraties are taken out of the smoke.
Obviously these are 5 story behemouths used to make electricity for the grid, and that steam is derived from cooling the sides of the boiler enoiugh to keep the boiler from melting, yet hot enough so as the fuel is placed inside, it is consumed before it hits the bottom since there is no grates.
I have always thought a home based system could be derived, but instead of powering electricity with illegal steam power, a turbine could be placed in the exhaust stream and a generator spun.
Only 130,000 rpm. Come on that’s too slow poky......but seriously I love these ideas but I’ll leave them to the professional engineers and genius inventors. Some serious forces at play here. Phase changes, etc. And lots of moving parts to keep my digits away from.