Corn is the vegetation equivalent of a cubicle dweller.
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Joined 2 years ago
Cake day: June 11th, 2023
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1·8 days agoeven overcoming the parasitic portion of extra energy needed during the compression cycle and the exhaust cycle against the turbocharger impeller?
Let’s assume the contrary. Let’s assume it can’t. Let’s assume the turbocharger is a net drag on the engine, and any gains are only from enabling the engine to burn more fuel. If this is all true, then the turbocharger should not be able to function without the reciprocating engine. Without the “push” from the pistons during the exhaust stroke, the turbo shouldn’t be able to turn.
If we can show that the turbo can not only spin without the piston engine, but that additional energy can be harvested, we will have disproven this assumption.
So, let’s get rid of the pistons. Plumb the intake manifold directly to the exhaust manifold. We have one combined intake/exhaust manifold. We stick a couple spark plugs into that manifold and turn it into a combustion chamber.
Now we have air passing through a compressor turbine, into a combustion chamber and then through an exhaust turbine. Sound familiar?
Engineers discovered that some turbos were capable of producing more power than the engines they were attached to. They discovered that the reciprocating engine was a drag on the turbo. The only reason to keep the reciprocating engine was because material science hadn’t caught up. We didn’t have turbos capable of directly handling the heat of combustion.
That discovery gave us the jet engine.
The exhaust gases get pushed
The “pushing” (exhaust stroke) isn’t particularly relevant.
When the valves close at the beginning of the compression stroke, the pressure in the cylinder is atmospheric: zero psig. The valves don’t open until the piston has risen (compression) and fallen (power) again. Without combustion, the pressure at the time the exhaust valves open is again at atmospheric. The gasses were compressed, and re-expanded, but only reach atmospheric. These gasses need to be pushed out.
With combustion, the pressure at the bottom of the stroke is substantially higher than atmospheric: the combustion event has radically increased the pressure of those gasses. At the end of the power stroke, just before the exhaust valves open, the pressure inside the cylinder is still extremely high. When the exhaust valves open, the overwhelming majority of the energy released to the exhaust stream is from the increased pressure. The “push” from the rising piston is relatively tiny.
It is the expansion of those gasses - not the “pushing” of those gasses - that drives the turbo.
I think it might be beneficial to think about the next evolution in aircraft propulsion. The turbocharger operates by expanding gasses through a power turbine, and using that energy to drive a compressor turbine. Remove the cylinders and pistons from the path, carefully tune those turbines, and you have a turbojet.
If the pistons are “pushing” the turbocharger, the turbojet would be impossible. It is the expansion of the gasses, not the displacement of the pistons, that drives the turbocharger.
I stopped using cursive my sophomore year of high school. Started using smallcaps, and everyone was happier.
Sure, but no need for combs, hair product, trips to the barber… I shave my face in the shower, and just keep going.
I’m more interested in the technology itself, rather than its current application.
I feel like I am watching a toddler taking her first steps; wondering what she will eventually accomplish in her lifetime. But the loudest voices aren’t cheering her on: they’re sitting in their recliners, smugly claiming she’s useless. She can’t even participate in a marathon, let alone compete with actual athletes!
Basically, the best AIs currently have college-level mastery of language, and the reasoning skills of children. They are already far more capable and productive than anti-vaxxers, or our current president.
It found 51% of all AI answers to questions about the news were judged to have significant issues of some form.
How good are the human answers? I mean, I expect that an AI’s error rate is currently higher than an “expert” in their field.
But I’d guess the AI is quite a bit better than, say, the average Republican.
New Mexico? You mean “South America”, right?
(Everything south of the Rio Grande is now “Mexico”. Except for the
PanamaAmerica canal.)
Check out Rai stones.
Although the ownership of a particular stone might change, the stone itself is rarely moved due to its weight and risk of damage. Thus the physical location of a stone was often not significant: ownership was established by shared agreement and could be transferred even without physical access to the stone. Each large stone had an oral history that included the names of previous owners.
In one instance, a large rai being transported by canoe and outrigger was accidentally dropped and sank to the sea floor. Although it was never seen again, everyone agreed that the rai must still be there, so it continued to be transacted as any other stone.
2·16 days agoTell me you’ve never played Kerbal Space Program without telling me you’ve never played Kerbal Space Program.
6·17 days agoI used the same approach at the family business for years without any major problems. Go for it.
They bought a cybertruck. Are they really innocent?
During signup, they make it sound like it’s a federated service. It is not. Dumped it when it was explained to me.
You can set up a simple, dumb thermostat in parallel, to act as a failsafe. Set it 5 degrees below your lowest heat setpoint, and even if your server crashes, it doesn’t let your house freeze.
Reddit ended like two years ago.
A Mark VI only has a 18 to 160 kiloton yield.
Can we replace it with a B83?
Galaxy S Relay
5 line keyboard!