Motordyne - Tony
Former G35driver Vendor
iTrader: (23)
Joined: Jul 2004
Posts: 3,054
Likes: 85
From: Los Angeles California
Originally Posted by Jeff92se
A total uneducated guess but for that rocket style expanded exhaust tip to function wouldn't two things have to be happening?
1) In order to increase velocity, the opening has to be necked down right before the expansion
2) For expansion/flow, wouldn't the gasses have to be increasing in temp vs decreasing at the end of the exhaust pipe?
1) In order to increase velocity, the opening has to be necked down right before the expansion
2) For expansion/flow, wouldn't the gasses have to be increasing in temp vs decreasing at the end of the exhaust pipe?
You're in the right ball park, but you're thinking of a DeLaval nozzle. A diffuser is/does the exact opposite of a DeLaval nozzle even though they look similar.
A DeLaval nozzle (or rocket nozzle) speeds up the exhaust plume, decreases temperature, decreases static pressure and increases dynamic pressure. A DeLaval nozzle relies on the principle of adiabatic expansion.
Conversely, a diffuser slows down the exhaust plume, increases static temperature, increases static pressure and decreases dynamic pressure. A diffuser relies on the principle of adiabatic compression.
In this case, it is the decrease in dynamic pressure that is advantageous. Rather than wasting energy as a blast of high velocity gas out the exhaust tip, the diffuser slows it down before venting to atmosphere.
The conservation of kinetic energy (or RhoV^2/2G) means the engine can push out the exhaust gas with less resistance. Thus less pressure drop and better performance.
Maybe I'm making it more technical than it needs to be, but I'm not one pass up advantageous engineering techniques.
---
Edit: If automotive exhaust systems were designed and built by Boeing Rocketdyne, they would be doing the same thing.
Last edited by Hydrazine; May 15, 2008 at 01:09 PM.
Originally Posted by Hydrazine
Right on Jeff!
You're in the right ball park, but you're thinking of a DeLaval nozzle. A diffuser is/does the exact opposite of a DeLaval nozzle even though they look similar.
A DeLaval nozzle (or rocket nozzle) speeds up the exhaust plume, decreases temperature, decreases static pressure and increases dynamic pressure. A DeLaval nozzle relies on the principle of adiabatic expansion.
Conversely, a diffuser slows down the exhaust plume, increases static temperature, increases static pressure and decreases dynamic pressure. A diffuser relies on the principle of adiabatic compression.
In this case, it is the decrease in dynamic pressure that is advantageous. Rather than wasting energy as a blast of high velocity gas out the exhaust tip, the diffuser slows it down before venting to atmosphere.
The conservation of kinetic energy (or RhoV^2/2G) means the engine can push out the exhaust gas with less resistance. Thus less pressure drop and better performance.
Maybe I'm making it more technical than it needs to be, but I'm not one pass up advantageous engineering techniques.
---
Edit: If automotive exhaust systems were designed and built by Boeing Rocketdyne, they would be doing the same thing.
You're in the right ball park, but you're thinking of a DeLaval nozzle. A diffuser is/does the exact opposite of a DeLaval nozzle even though they look similar.
A DeLaval nozzle (or rocket nozzle) speeds up the exhaust plume, decreases temperature, decreases static pressure and increases dynamic pressure. A DeLaval nozzle relies on the principle of adiabatic expansion.
Conversely, a diffuser slows down the exhaust plume, increases static temperature, increases static pressure and decreases dynamic pressure. A diffuser relies on the principle of adiabatic compression.
In this case, it is the decrease in dynamic pressure that is advantageous. Rather than wasting energy as a blast of high velocity gas out the exhaust tip, the diffuser slows it down before venting to atmosphere.
The conservation of kinetic energy (or RhoV^2/2G) means the engine can push out the exhaust gas with less resistance. Thus less pressure drop and better performance.
Maybe I'm making it more technical than it needs to be, but I'm not one pass up advantageous engineering techniques.
---
Edit: If automotive exhaust systems were designed and built by Boeing Rocketdyne, they would be doing the same thing.
I presume sedan is part of the production line... I'm wondering how much different it is though - tips like the pic will never fit (will they?)
Originally Posted by Hydrazine
Right on Jeff!
You're in the right ball park, but you're thinking of a DeLaval nozzle. A diffuser is/does the exact opposite of a DeLaval nozzle even though they look similar.
A DeLaval nozzle (or rocket nozzle) speeds up the exhaust plume, decreases temperature, decreases static pressure and increases dynamic pressure. A DeLaval nozzle relies on the principle of adiabatic expansion.
Conversely, a diffuser slows down the exhaust plume, increases static temperature, increases static pressure and decreases dynamic pressure. A diffuser relies on the principle of adiabatic compression.
In this case, it is the decrease in dynamic pressure that is advantageous. Rather than wasting energy as a blast of high velocity gas out the exhaust tip, the diffuser slows it down before venting to atmosphere.
The conservation of kinetic energy (or RhoV^2/2G) means the engine can push out the exhaust gas with less resistance. Thus less pressure drop and better performance.
Maybe I'm making it more technical than it needs to be, but I'm not one pass up advantageous engineering techniques.
---
Edit: If automotive exhaust systems were designed and built by Boeing Rocketdyne, they would be doing the same thing.
You're in the right ball park, but you're thinking of a DeLaval nozzle. A diffuser is/does the exact opposite of a DeLaval nozzle even though they look similar.
A DeLaval nozzle (or rocket nozzle) speeds up the exhaust plume, decreases temperature, decreases static pressure and increases dynamic pressure. A DeLaval nozzle relies on the principle of adiabatic expansion.
Conversely, a diffuser slows down the exhaust plume, increases static temperature, increases static pressure and decreases dynamic pressure. A diffuser relies on the principle of adiabatic compression.
In this case, it is the decrease in dynamic pressure that is advantageous. Rather than wasting energy as a blast of high velocity gas out the exhaust tip, the diffuser slows it down before venting to atmosphere.
The conservation of kinetic energy (or RhoV^2/2G) means the engine can push out the exhaust gas with less resistance. Thus less pressure drop and better performance.
Maybe I'm making it more technical than it needs to be, but I'm not one pass up advantageous engineering techniques.
---
Edit: If automotive exhaust systems were designed and built by Boeing Rocketdyne, they would be doing the same thing.
Originally Posted by Drewer
Tony, I got one of these shirts with your name on it!
One of my suppliers said he was running behind by 2 weeks so its scheduled to arrive June 15. At that point production starts.
Registered User
iTrader: (2)
Joined: Jun 2006
Posts: 972
Likes: 21
From: 916/847/650/415/408/510/512/406
Originally Posted by Hydrazine
Right on Jeff!
You're in the right ball park, but you're thinking of a DeLaval nozzle. A diffuser is/does the exact opposite of a DeLaval nozzle even though they look similar.
A DeLaval nozzle (or rocket nozzle) speeds up the exhaust plume, decreases temperature, decreases static pressure and increases dynamic pressure. A DeLaval nozzle relies on the principle of adiabatic expansion.
Conversely, a diffuser slows down the exhaust plume, increases static temperature, increases static pressure and decreases dynamic pressure. A diffuser relies on the principle of adiabatic compression.
In this case, it is the decrease in dynamic pressure that is advantageous. Rather than wasting energy as a blast of high velocity gas out the exhaust tip, the diffuser slows it down before venting to atmosphere.
The conservation of kinetic energy (or RhoV^2/2G) means the engine can push out the exhaust gas with less resistance. Thus less pressure drop and better performance.
Maybe I'm making it more technical than it needs to be, but I'm not one pass up advantageous engineering techniques.
---
Edit: If automotive exhaust systems were designed and built by Boeing Rocketdyne, they would be doing the same thing.
You're in the right ball park, but you're thinking of a DeLaval nozzle. A diffuser is/does the exact opposite of a DeLaval nozzle even though they look similar.
A DeLaval nozzle (or rocket nozzle) speeds up the exhaust plume, decreases temperature, decreases static pressure and increases dynamic pressure. A DeLaval nozzle relies on the principle of adiabatic expansion.
Conversely, a diffuser slows down the exhaust plume, increases static temperature, increases static pressure and decreases dynamic pressure. A diffuser relies on the principle of adiabatic compression.
In this case, it is the decrease in dynamic pressure that is advantageous. Rather than wasting energy as a blast of high velocity gas out the exhaust tip, the diffuser slows it down before venting to atmosphere.
The conservation of kinetic energy (or RhoV^2/2G) means the engine can push out the exhaust gas with less resistance. Thus less pressure drop and better performance.
Maybe I'm making it more technical than it needs to be, but I'm not one pass up advantageous engineering techniques.
---
Edit: If automotive exhaust systems were designed and built by Boeing Rocketdyne, they would be doing the same thing.
E equals M C Squared 
Former G35driver Vendor
iTrader: (23)
Joined: Jul 2004
Posts: 3,054
Likes: 85
From: Los Angeles California
Originally Posted by lekker_droom
woohoo! When do you think it'll be added to your site so people can start ordering?
Originally Posted by Hydrazine
Setting up the website to take orders will be another project, but I'll just start things up on the forums. Release will be an evolving process.
We would like to see pics of the new exhaust systems when I put a site up to order. Also sould clips would be great too.
Cannot wait to see what your company comes up with.
Cannot wait to see what your company comes up with.
Originally Posted by Hydrazine
There is going to be an almost continuous evolution of stuff comming out.
With plenty of Ti and exotics for the Bling Ballers too!
With plenty of Ti and exotics for the Bling Ballers too!
Registered User
Joined: Jul 2005
Posts: 36
Likes: 0
From: Chatsworth, CA
Originally Posted by Hydrazine
There is going to be an almost continuous evolution of stuff comming out.
With plenty of Ti and exotics for the Bling Ballers too!
With plenty of Ti and exotics for the Bling Ballers too!
Hehehe. Maybe not a bad idea.
