Just call me "Never Wrong" Hymee

Cheers,
Hymee.

 

Don't tell me you gave me your last copy. You sillyoldbastard.

Cheers,
Hymee.

 

So what this translates to in laws of nature is that your compressor puts less heat into the charge, as the relationship between pressure, mass and volume gets back to a constant. More mass for the same pressure must mean less temp.

Thank goodness I'm using a twin-screw instead.

Cheers,
Hymee.

 

I must have the original magazine but it hasn't jumped out at me lately.

 

And If you don't make the heat you don't use the power to produce it.



I was carefull not to lump you in there as just a PD.

 

I wish I could edit your posts and fix the quotes up for you!

Cheers,
Hymee.

 

RP compressor gets more net power form an engine because of the following main reasons not including the mixing effect if additional fuel is added before the compressor

1) It take less power to drive the unit at any given PSI/RPM (less parasitic drag on the crank)


2) It produces a higher mass flow rate at any given PSI/RPM (due to a more efficient compression mode causing less heat of compression)

3) The compressed air charger is lower in temperature so the ignition timing can be advanced.

 

what's wrong with his quotes?

 

Damn, I was trying to cheat a little by not mentioning that mixing thing. I guess you read my homoginization paper where I mention this test. So yes the fuel went in before the blower because it was a drawthrough carb system. So were the others. But the ign timing was held the same for all blowers.

 

I read that homogenization article also...is this unit for the RX-8 not going to do the homogenization process also?

 

ok so you could have gotten even more POWER than the other guys

 

I'd be curious to see what would have happened if that test was allowed to have seen what the full max potential from each design was with optimum tuning for each setup. Forget being fair. Let the axial flow walk away even further from those heaters.

 

Well said rotarygod


I don’t think it has been posted yet what is the output of the compressor at WOT in either
mass flow rate VS RPM
OR
lbs of air VS engine RPM??

 

RP are you still planning on adding additional fuel before the compressor?
If yes
Have you figured out how much heat will be removed from the air charge due to the evaporation/mixing of the fuel with the air as it goes thru the compressor?

 

You really can't put a definitive figure on how much heat is going to be taken out. You always want to be careful when injecting fuel that far away. If you get a backfire in the intake (probably a lot harder on a rotary than pistons), you can very easily destroy the blower.

So is the Axial Flow basically a better centrifugal blower (in powerband type)?

 

Not just a backfire, but any source of ignition such as foreign object ingestion or a broken blade could be bad news. Would an ignition source turn the AFS into a blowtorch? Or did I just invent the jet engine?

 

i invented the jet engine 40 or more pages ago. in fact you owe me a quarter for use of the term

 

If he added fuel befre the blower, it would only be at higher boost levels when the air is moving very fast. He wouldn't inject it full time.

The powerband should be better than a centrifugal. As was stated earlier, in a perfect world the boost curve of this would be linear. A centrifugal though has it's boost rise with the square of the rpm. The axial would have more midrange power.

 

So the intent is still to have the supplemental boost fuel added before the compressor?

 

no

 

He wasn't going to do it as far as I knew. That's just how he would do it if he decided to.

 

so you dont realy know; it could go either way
Were is RP he has not posted in a while to busy working......

 

he said some time ago that he had decided not to do that. like 20 or 30 pages ago

 

ok Must have missed that post

 

First of all the pressure ratio is only around 0.5 through the blower, which leads to a relatively small heat increase and which is reduced anyways because of the heat reduction due to fuel evaporation. Second, there are no hotspots in the manifold where it could preignite.