Looks like we think a lot alike.

Any updates on bench tests?........

Flow rate @ XX pressure???
Number of stages on redesigned compressor?
Size?
Hp to drive compressor?
Measured efficiency?
ECT.....


Keep up the good work.
Looks like your web site is up.

 

So max boost with this single stage would be static air pressure?
considering 100% eff.

 

TJ S 2K Posted on Mar 8 2005, 12:22 AM
So max boost with this single stage would be static air pressure?
considering 100% eff

Richard correct me if I am wrong.


The PR for each stage is 1.09
Do not confuse the mechanical efficiency with adiabatic efficiency (the temp increase that occurs when compressing a compressible fluid)
So using absolute pressure at sea level 14.7psi
A single stage running 100% mechanical efficiency would produce 16.023psi absolute or 1.323psi manifold pressure.
But why are you only asking about running one stage?
It

 

Thank you, I was interested in the PR per stage
and you answered my question

 

The RX-8 Forum about this topic started by Richard is about to hit 100 pages


Thats not a typo 100pages!!

Come on guys we got to catch up

 

-I wish I could help...Unfortunately I've been lost since page two.

I think I need the link to "The idiots guide to supercharging"...

 

Thats because the RX8 forum has been chomping at the bit for FI for a long time.
I think there are two turbo kits out for them now, My kids waiting and watching money in hand to see which one works out best for his rx8. I think a lot of others are as well.

With the high tranny gearing, rpms and the 444 dif gears they come with, it will be a scary fast machine.

fltsfshr

 

Unfortunately a link to the idiots guide wont help much when it comes to axial supercharging. The basics are the same more mass density of the air charge with proper fuel and spark timing = more HP/TQ excluding failure of other components due to added stress of supercharging.(over simplified yes )

The idea of axial supercharging has mostly, up to this point, been used in the aircraft industry.

If you feel up to it read the RX-8 forum (100 pages) link below it should give you some incite on how this technology has progressed through the years and the steps Richard has taken to apply this technology to piston and rotary automobile engines.


RX-8 Forum by Richard talking about the axial supercharger.

Richards Axial supercharger Web page (under construction)

 

Thanks for the links! Now maybe I can get to page "3" and (hopefully) understand what I'm reading...

 

You guys seem to understand the stage relatioship. On paper the design calls out Pr of 1.09 to 1.12 on different stages. But when built it winds up averaging aout 1.12. This is due to the equations being conservitive and that when coming to a point of avaraging up or down I always go down in the design stage. Also when confronted with choice of blading I do the same thing.

So you don't add these you compound them with the exponant representing the number oof stages. Say four: 1.12^4=1.57 or about 8 psi. These numbers only really give the ballpark of where you will end up. But again because of my design habits they are usually higher. As can be seen above. If I used the numbers that came up in the calc's it would have been lower. I used 1.12 haveing already tested the unit and know what theresult is. Then modifying the multiplier to fit. So I cheated. Call my professor and tell on me. Send me to the Dean, I always wanted to be on his list anyway.

Now there would be no reason to build this with one stage would there? Unless you were in a position to run at a constant speed with no need for off design operation. There is something else to ponder. Work on super sonic blading has shown Pr up to 3.5 with single stage. Don't get your hopes up, this is early lab work just to explore the area. You would have a hell of a time going trans sonic. Then you would need to hold a very narrow rpm band.

I don't know much about this work which is being done in England but it must use the shock wave to get this pressure. That would make perfect sense and a great use for this product of physics.
Somehow there are designs with supersonic on one blade or the other then with both being ballistic. I have seen the shapes of these blades and they remind me of the SR-71 for some reason.

If some of you read my babbling on the Rx forum you might have read my paper on homoginization. I want to get that into this forum as an attachment like it is there. It would take many pages and be boring to most if it were just put into the thread. Anyway that paper has a lot of ideas that would be applied to y system for the S2k. I want to add the extra fuel through the supercharger to take advantage of the mixing propertys.

If you want to read that paper it is on page five of my thread and is shown as an attachment. I think it is page five, if not it's close, you'll find it along with some other good things you can use to study engine performance.

If the Mods can give me a way to install those papers here I would do so.