Paul Carey wrote:

Hi Douglas and Paul

In my discussions with Theo, the Neptune owner who sold me the Power
Turbine, he could talk endlessly about the PT blade design and

material

specs, and from memory he called it a "bucket" design - the blade

can

absorb

most of the exhaust gas energy under load (as in - connected to the

engine).

You can see the attached photos of the blades, the angle of attack

and

double wall. The wheel is driven clockwise in these photos.
I wonder how a turbocharger, designed to free rev with no load, will

handle

being direct driven. Will the turbine be able to absorb enough

energy,

and

what will the gas path be doing?

Regards PC

Paul Carey LAME, MC
Aero Group Pty Ltd ACN 109 854 015
Aero Management - aviation consultants.
www.aeromanagement.com.au
(08) 9371 5205  0418 959 892

Vance W Jaqua wrote:

The turbine is probably a GE design - direct from the same family as the

B17

turbochargers - axial flow - reaction blade shaping. When I was at GE
Aircraft
Gas Turbine Division in the late 50's early 60's any turbine blade was a
"bucket"
GE's first production turbofan was a rear fan with a turbine section

inboard

and the fan blade section outboard, and they called that blade a
"blucket"(blade bucket)
With the hot root there was real concern about seperation failure, so
various
armor rings were designed   "blucket catchers" -
To answer how the direct drive turbine will react - like an enormous
flywheel

 Vance

Paul Carey wrote:

Hi Vance
Very interesting comments - amazing who one encounters on this forum.
Do you mind expanding on your comment:  "To answer how the direct drive
turbine will react - like an enormous flywheel"

Paul
The turbocharger suitability was a general doubt, based on a hunch - no
research. If it has been done before - great, and will be interesting to see
your results. I am a firm believer in the concept.

PC

I am going to jump in here. Yes if geared up. If not geared up no more so than
a regular flywheel. However... much to my early surprise and a lot of other people's
surprise the engine rotational inertia has little to do with AA fuel drag racing acceleration 
as the clutch is dropped while the engine is running at near max torque RPM. If 
anything a heavy flywheel will store energy which is released when the clutch is 
side stepped. I think Archie can fill us in on this far better than I.
I know my RX8 does far better in the 0-60 time if I drop the clutch at
7000 RPM.

Paul Lamar

 
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