Posted on 08/23/2009 7:08:39 PM PDT by mamelukesabre
ARLINGTON, Va. —The Truck Writers of North America (TWNA) announced Detroit Diesel Corporation’s DD15 engine turbo compounding as the winner of its Technical Achievement Award for 2008 during TMC’s 2009 Annual Meeting in Orlando, Fla., Feb. 9-12.
(Excerpt) Read more at layover.com ...
They won’t, they don’t want to increase the supply of diesel in the country.
This goes against the strategy of “Energy Denial” that the libs are executing.
Even though it would be more efficient, they will oppose it because it defeats a bigger goal of destroying the average persons’ energy freedom. If you can get better mileage and diesel’s cost stays the same, you will drive more and this is not good. If they make more diesel so you can all drive more diesel cars and thus be freer, and even though pollution will be down because it’s cleaner now, they don’t want us to have all this energy we can use.
They believe we are using too much, and so they oppose cleaner technology because that allows us to use more without harming the environment (control is important, not the environment); they oppose new exploration and development of US sources of oil and coal and gas (because control is important, not energy independence OR energy abundance); and they oppose the cleanest and newest designs in nuclear (because control is important, not the environment, cheap energy, or clean energy).
They are in the process of taking us down as a superpower. They are forcing us to remain dependent on foreign energy, wasting our money on windmills, they are tanking the currency that will ultimately lead to hyperinflation by printing so much of it but there’s nothing backing it.
We have to get the country back fast or it’s all over and global government and national sovereignty are gone. These people are traitors and need to be exposed as such. This isn’t just incompetence, it’s deliberate destruction and takeover.
Ok, here’s what’s happening. a turbo increases power by boosting the intake. Doing so increases the required fuel to maintain proper fuel air ratio. A compound turbo boosts power without any increase in fuel demand. How? because a compound turbo doesn’t boost intake pressure. It dumps all it’s energy directly to the crankshaft. More power without more fuel or more heat or more manifold pressure.
I think you should understand it now, right?
In WWII, they gave up on the compound turbo because they realized the output shaft of the turbo was producing more power than the output shaft of the engine. So they decided to get rid of the engine all together and just have the turbo...
That’s what we call a TURBOPROP.
If you are dumping mechanical energy directly to the crankshaft, what are you doing?
Answer: Driving the #$^& wheels. Or if it is a plane, you are driving the prop.
Just read the wiki article like I said.
The last of the turbo compounds were used in the final versions of civilian piston airliners (before the conversion to the turbine technology of today)...and also notably the B-29 Superfortress bomber...
That connection at the crank is NOT turbine power going back to the crankshaft, That’s one stage of this compound turbine POWERED by the crank. you can see the boost side tubing running to the intake side top rear of the engine, as well as the exhaust side pipes running to the back of the unit from both sides of the engine to a “t” joint. The crank drives an secondary turbo charger which compresses the compressed air from the primary turbocharger at the rear.
Your compressing air and dumping into the intake. period.
It's not a jet engine, it's a piston engine.
and look at that wiki page, and read it yourself. see the pic? thats a Nomad engine. See that pointy thing after the turbo? thats the air intake for the compressor side of the unit.
But a lot of diesel mechanics would laugh if you tried.
the secondary turbine’s output is hydrodynamically coupled to the engine’s drive gears.
I know what that means. i would think you should be able to read it and understand what it says too.
Are you sure it’s not the exhaust outlet?
ping
Huh? Detroit Diesel engines have a LONG history of using "roots" superchargers, in fact the 4/71 and 6/71 "roots blowers" (which later made their way to hot rods and drag racers) were standard on Detroit Diesels (the 8/71 and larger were aftermarket, rather than GMC manufactured.)
Take another look at the design. The "compound turbocharger" is NOT used to increase the intake charge density. What's happening here that the exhaust gasses from a 2 stroke engine power a turbine whos output shaft is coupled to the engine's output shaft, thereby using some of the wasted power from the exhaust gasses and using that to augment the output of the 2 stroke engine.
Regarding the compound turnbsharger, this has nothing to do with the intake side.
Mark
A Turbo-compound engine is a reciprocating engine that employs a blowdown turbine to recover energy from the exhaust gases.
When a blowdown turbine is attached to an engine it will not reduce power due to exhaust gas flow restriction,
Mark
You can see at this link:
http://www.pilotfriend.com/aero_engines/images2/40.jpg
The exhaust-driven turbine is not used to drive a compressor for the intake. Instead it is coupled to the output shaft and adds to the torque produced by the “main” engine.
Just sounds like the exhaust gases drive a turbine which is hydro-
dynamically connected to the drive gears..using waste energy
to help drive the wheels...decent idea.
I suppose this could work with a gasoline engine also. Anyone know
about that ?
How about using the waste heat to power stirling engines which
help recharge batteries in a hybrid?
I wonder if anyone has ever tried this combination:
Hybrid Car
High pressure(higher than normal diesel in diesel system)
and same in gas engine
Solar cell array on roof,trunklid, engine hood to recharge batteries.
Stirling engines to recover all waste heat(exhaust, cabin temp)
to recharge batteries
Superoverdrive transmission
Low final drive ratio
Super low coefficient of drag
I wonder if they could apply such considerations on the
new Volt.
Anybody here with a car engineering degree who would know
about these things?
If I remember correctly, the exhaust melted the asphalt pavement when they came to a stop.
Interesting. I wonder if that recovered exhaust energy would be better utilized by dedicating that output shaft to, say, turning a generator in a hybrid application? Sounds like a natural for a large diesel-electric application - public transit buses, perhaps.
Seems like the configuration needed to return that energy directly to the engine's crankshaft (as per your linked image) would be a challenge in an automotive application. You'd likely have to tie it in to the front end of the crank, rather than the rear (as in aircraft applications).
“I suppose this could work with a gasoline engine also. Anyone know about that ?”
When I was a kid we could fire a potato out of the exhaust pipe of my neighbors’ car. Does that count? ;-)
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