Gordon,


To measure exhaust gas flow don't we just need to know the speed of the
gases, the cross sectional area of the exhaust gas manifold and the
temperature and pressure?


Correct me if I am wrong here but it is easy to measure the temp using
thermo couples or even non contact infrared sensing devices.

Speed.  It is probably close to or super sonic. If we slow it down at least
one order  by sending it through a large insulated pipe, we could sense it
with my present ultrasonic equipment used for testing wind speeds or flows
in ducts.

With a known diameter pipe it is easy to calculate the volume and speed.

Pressure.   High temperature piezo electric sensors are available on the
market.

Here is an expensive  way that NASA looks at very high speed gas flows.
Beyond our budget:)


http://www.grc.nasa.gov/WWW/RT/2004/RI/RIO-mielke.html

DougFir



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