Orifice Proximity Testing

[Old Grey]

This is probably a long shot, but has anyone tested how close an orifice can be to a side wall in a flowbench before it starts affecting the ability of the orifice to read accurately. And how close can the floating baffle be, because it will be a lot bigger and will probably rest against a wall if the orifice is close.

I noticed that the PTS has everything centrally aligned, ie orifice and openings, to allow equal air distribution to the orifice, where as the smaller SF benches have the ability to bolt the actual pipes to the head while testing because the opening is close to the edge. I like the idea, and it's more convenient, to use the actual pipes rather than simulated exhaust stub stacks, and was wondering if anyone knows.

[Brucepts]

Baffle plate less than 2" high on the PTS Design effects flow numbers

The larger the beta ratio between the walls and the orifice hole the better

The plate needs to see airflow from all sides equally and if one wall is closer the orifice is not seeing the same airflow . . .