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| Want to make energy please. |
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| Rob.Wilson:
I THINK the Swedish built biomass gasifiers during the 2nd world war to run there cars. And had it pretty well sussed :smart: Rob |
| PekkaNF:
Finns used wood gas pretty much during the wars. According to this at the end of year 1941 95% buses in Finland used wood gas. See page 3 abstract: http://publications.theseus.fi/bitstream/handle/10024/33120/niskanen_mauri.pdf?sequence=1 this seems to bring quite a few usefull google hits: SOLO STIRLING 161 micro CHP- Module Pekka |
| Swarfing:
You might want to look at pellet stoves as well, some of these use the wood gas. |
| Lew_Merrick_PE:
--- Quote from: sparky961 on December 29, 2012, 07:49:12 PM ---Since you seem to be something of an expert on the subject, would there be a good reason not to build a Savonious Rotor with a horizontal axis? I think making the support structure could be simplified if oriented that way. --- End quote --- I believe you already figured this one out. --- Quote from: sparky961 on December 29, 2012, 07:49:12 PM ---Also, what did you mean by exhausting out the center? Most designs I've looked at are open to the opposite side in the center (they overlap). Is that sufficient? Maybe you can point to some information on an efficient design for one of these? --- End quote --- The thing to understand is that, as the direction of flow is changed by the initial impeller shape, the speed is increased by compression into the center of the alignment. When it is exhausted "out the other side," you are actually vampiring energy from your torque to feed the combination of temperature drop and expansion (V = nRT/P -- to rewrite the Ideal Gas Law). This statement applies to a canisterred unit that also protects you from the Cv(air density)(area of impingement)(air velocity²)/2 (where Cv is the Velocity Coefficient of Drag -- approximately = 0.5 for a hemispherical face) drag on the "return" side of your rotor. In a canister variation of a Savonious rotor, the pressure drop between the inlet and exhaust is the driving energy. If you return your pressure to ambient, you are losing 50% of your energy. If you draw it from the (low-pressure/high velocity) center, you gain back a significant portion of those losses. If you use a NACA-7 aerocurve for your capture geometry you gain (nearly) 15% over a semicircle shape. Basically, you want to look into aero mass-flow equations and their related geometry in an aeronautical engineering handbook. The problem is that they are written to protect the high priests of aerodynamics and not to instruct those seeking to learn today. You need to go back to handbooks & texts written in the 1920's & 1930's to find truly explanatory texts. The version of Wing Theory Sections that credit Bruno as the author (not the "revised" ones crediting Abbott & von Doenhoff) is quite good. They were readily available in used technical book stores (at least) into the mid-1970's. One of my mentors was Maj Gen, Dr. Joseph Black. One of his statements was that, to really understand a subject, you need to go back before there was a priesthood established to keep the hoi polloi from intruding. This is one of the best pieces of advice it has ever been my pleasure to receive. |
| ieezitin:
Gentlemen Thanks for a lot of good information. Having the IC engine suck the gas in really is a help. As to the stirling it is my intention to make one in fact im ready to make one now but I need to know where I can locate, purchase or copy some plans. I have never made engines so prints would be necessary for me to cut my teeth on. I don’t want the tea-cup version I envision the full Monty Megawatt Telefunken U47 Model. :bugeye: Any Thoughts? Anthony. |
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