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Search: Posts Made By: oggers
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Forum: Tech Log
8th Jan 2012, 15:15
Replies: 155
Views: 42,086
Posted By oggers

Crabman: No. You have not answered the question,...

Crabman: No. You have not answered the question, merely repeated it. We know there is an increase in efficiency - half the question was predicated upon that very observation.



The question is...
Forum: Tech Log
5th Jan 2012, 13:36
Replies: 155
Views: 42,086
Posted By oggers

Slippers... :suspect: In post #63 CW...

Slippers...



:suspect: In post #63 CW answered that very question: "why compress - to release more energy to do useful work per unit time within the engine (be it piston or turbine)." But in...
Forum: Tech Log
29th Dec 2011, 12:03
Replies: 155
Views: 42,086
Posted By oggers

Slippery The edit to your last post is...

Slippery

The edit to your last post is welcome. Crucially you now agree with what CW has been saying in principle, so well done, we are halfway there.

As for the other change:



I'm not...
Forum: Tech Log
27th Dec 2011, 12:47
Replies: 155
Views: 42,086
Posted By oggers

Slippery It certainly isn't the laws...

Slippery



It certainly isn't the laws of physics at issue, so let's have another look at your first post:



No. In a cylinder, when you burn a given quantity of fuel 'Q', you get:
Forum: Tech Log
19th Dec 2011, 14:19
Replies: 155
Views: 42,086
Posted By oggers

QJB

You will not find the answer to your question in the Carnot cycle where, for two given heat reservoirs, you can achieve the same efficiency regardless of compression ratio used. With your statement...
Forum: Tech Log
28th Nov 2011, 08:43
Replies: 155
Views: 42,086
Posted By oggers

Slippery_pete: the answers at #43 and #47 are...

Slippery_pete: the answers at #43 and #47 are still there.



No. Multiple posters have disagreed with you along the way, and your latest "concept" bears no resemblance to your original, so job...
Forum: Tech Log
25th Nov 2011, 12:21
Replies: 155
Views: 42,086
Posted By oggers

Slippery_pete: Wrong again. The...

Slippery_pete:



Wrong again. The "unswept volume" is the combustion chamber (or at least part of it depending how semantic you want to be). It is the swept volume x the volumetric efficiency...
Forum: Tech Log
22nd Nov 2011, 10:48
Replies: 155
Views: 42,086
Posted By oggers

slippery.... If you confine yourself...

slippery....



If you confine yourself to framing everything in terms of thermal efficiency you will never be able to explain how or why an engine works.

The topic of this thread is simply...
Forum: Tech Log
21st Nov 2011, 09:54
Replies: 155
Views: 42,086
Posted By oggers

Barit: No doubt you're quite right....

Barit:



No doubt you're quite right. However, I was responding to aerobat's specific scenario regarding his specific type in which he observes an ITT rise.

If you follow the thread back you...
Forum: Tech Log
19th Nov 2011, 11:10
Replies: 155
Views: 42,086
Posted By oggers

Aerobat77: Turbine engines utilise air...

Aerobat77:



Turbine engines utilise air for cooling of the combustion chamber and the turbines themselves. ITT will rise due to the reduced mass flow rate of air going to the combustion chamber...
Forum: Tech Log
18th Nov 2011, 16:02
Replies: 155
Views: 42,086
Posted By oggers

Slippery_pete: please don't do this to yourself....

Slippery_pete: please don't do this to yourself. You know full well that all of those things were being discussed in the context of the piston engine. Anyone who reviewed our exchange could see that...
Forum: Tech Log
17th Nov 2011, 16:12
Replies: 155
Views: 42,086
Posted By oggers

Luc, both myself and slippery gave our direct...

Luc, both myself and slippery gave our direct answers to QJB at the top. With all due respect you aren't a moderator. := This is a forum and it is in the nature of these things for a thread to...
Forum: Tech Log
17th Nov 2011, 12:57
Replies: 155
Views: 42,086
Posted By oggers

Slippers...

Don't worry. there's so much wrong that I'm still considering where to begin!



Yes I did miss that, thanks for pointing it out 'cos that's badly wrong as well! All you'll do is punch a hole in...
Forum: Tech Log
17th Nov 2011, 09:04
Replies: 155
Views: 42,086
Posted By oggers

Slippery: That is essentially one big mess...

Slippery:

That is essentially one big mess of obfuscation and strawmen. It is pretty much a gish gallop so I'll just pick on a few points for now.



Flame front speeds are very important for...
Forum: Tech Log
16th Nov 2011, 19:19
Replies: 155
Views: 42,086
Posted By oggers

aerobat: The old correlation is not...

aerobat:



The old correlation is not causation phrase springs to mind. There is another simpler explanation though: in a turbine, air is used to cool the combustion chamber but seeing as you...
Forum: Tech Log
16th Nov 2011, 14:31
Replies: 155
Views: 42,086
Posted By oggers

Slippery: You are indeed slippery!...

Slippery:



You are indeed slippery! That sounds suspiciously like what I said to begin with: 'The goal is to get maximum charge into a given combustion chamber. That is, basically, volumetric...
Forum: Tech Log
15th Nov 2011, 20:24
Replies: 155
Views: 42,086
Posted By oggers

Slippery...

This is my serious face.



I'm not challenging the laws of thermodyamics. What I'm disagreeing with is how you've explained them as they apply to a real engine. You may have a degree in physics...
Forum: Tech Log
11th Nov 2011, 14:14
Replies: 155
Views: 42,086
Posted By oggers

Best Answer (rated by viewers)

Best Answer (rated by viewers)
Forum: Tech Log
11th Nov 2011, 11:33
Replies: 155
Views: 42,086
Posted By oggers

No not really. It was the crank that turned the...

No not really. It was the crank that turned the piston that compressed the air in the first place, so no gain there only a net loss. :rolleyes:
Forum: Tech Log
11th Nov 2011, 10:34
Replies: 155
Views: 42,086
Posted By oggers

QJB: The goal is to get maximum amount...

QJB:

The goal is to get maximum amount (charge) of air/fuel mixture into a given combustion chamber. That is, basically, volumetric efficiency.

Therefore you compress the air to get more in....
Showing results 1 to 20 of 20


 
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