Topic Closed|
Go
|
New
|
Find
|
Notify
|
Tools
|
|
Member |
I found this site about the twin screw supercharger:
http://www.coloradocobras.com/whipple/about-whipple/whipple-twin-screw.html and how their bloweris more eficient than Roots or centrifugal blowers. It occurred to me to also add this device "running backward" to an engine to act as a non-turbo turbocompounder to extract evergu from the exhaust stream. Then it occurred to me...do away with the reciprocating piston engine altogether; just bolt the blower to the compounder with a combustor in between: a true rotary engine, not a diesel, not a gas turbine, but elements of both. On another board they said this would not generate enough of a compression ratio to work effectively as a stand alone engine, nor does the compounder have a surface area the pressurized exhaust can "push against". What do you say? Masochist to Sadist: "Hurt me." Sadist to Masochist: "No." |
||
|
|
member 2008 Sponsor |
What type of efficiency do you get with the verious turbocharger jet engine designes. There are several diferent "jet engine" concepts on ebay, one has a short video clip of a turbo running as a jet engine. This is not a pulse jet but an actual continuous burn turbin. Supposidly the military used this concept on aircraft ground power units. Ebay add's indicate up to 350 pounds thrust depending on the size of the turbocharger.
--------------------------------------------------------------------- 92 dodge cummins with over 260,000 miles. Running an unheated 50% diesel/50% WVO blend for about the last 75,000 miles when temps above 50 deg f, no modifications or heating except the addition of a throw-away in-line fuel filter (removed during cold weather). As of 8-01-05 I have been testing a 75% WVO/15% gasahol (90% RUG/10% ethanol)/10% diesel blend. Works fine down to about 65 f then starts rough. Runs ok once engine warms up. Back to a 50/50 diesel blend sence 9-15-05, just to cool now. -- 11-01-05 Modified stock fuel tank internal fuel pickup to have I.D. of 3/8 inch, this eliminated cold start slow idle and bogg on acceleration. Now adding 1 ounce each of acetone and pure gum spirits of turpentine to each 5 gallons of any blend, seems to help keep the fats in solution to a lower temperature --Heated 2nd tank in the works |
|||
|
|
Member |
The thermal efficiency is absically a function of the compression ratio (or for a turbine - pressure ratio) of the engine.
The tighter the air gets squeezed before combustion, the higher the efficiency. In thermodynamics, it's known as a brayton cycle engine, and closely related to Ericsson cycle engines. Get a good thermodynamics book at the library, or do some web searching, and I'm sure that will explain the thermodynamics. The area on the outlet of the whipplecharger has to be bigger than zero - it still has to push the air out. The pressure ratio is a function of combustion temperature, and the relative flow rates of the blower on the inlet and the outlet. So... I agree with Johno - it could be made to work, but efficiency will probably be in the tank. Search "gas turbine" on e-bay. There's usually fun stuff there that works along the same lines - sometimes pretty cheap. |
|||
|
|
Member |
I've built some piston compressor / expander engines... IC Ericsson cycle is what I call it here's link to some pictures if anyone is interested...
http://ph.groups.yahoo.com/group/HotAirEngineSociety/photos/browse/b2c3 If it was more fun everyone would be doing it! |
|||
|
| Previous Topic | Next Topic | powered by eve community |
 | Please Wait. Your request is being processed... |
|
|||
| Site | Biodiesel & SVO Home | ||
| Servlet | eve2da018 | ||
| Version | 1.2.22 build 9062 | ||
| Module | Forums 4.0.3 | ||
| Stylesheet | "Category Amazon banner" | ||
| Wordlet Set | "Default Wordlet Set" | ||
Topic Closed© Maui Green Energy 2000 - 2008