DIY flowbench?

[Greg Hermann]

  Thinking
>further abroad,  turbos must be pretty sensitive to overall EBP in terms of
>their ability to make boost?.....
>
>Walt.
>
The power output of the turbine depends on the absolute pressure ratio
across it from input to output. (Also on absolute temperature of input gas,
and mass flow of the gas.)

Reducing exhaust back-pressure downstream of the turbine means a higher
pressure ratio to drive the turbine, means more turbine output, means more
boost.

There are some complicating factors, such (notably) as reaching choked
(sonic, or Mach 1) flow in the inlet nozzle(s) to the turbine.

It takes an absolute pressure ratio of about 1.85 or 1.9 to 1 across a
nozzle to produce choked flow at the most constricted point in the nozzle.

Greg


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