Super chargers + MAP

[Greg Hermann]

.with a small trottle .Maybe some sentrifugal compressors would be
>forced into surge aria,at
>certain trottle openings.Making unstable airflow and map readings.

Operating in a lower density fluid (higher vacuum always moves you to the
right on the performance map of a centrifugal compressor--and away from the
surge line. Look at the correction equations for a map based on mass flow.
So a throttle in the input to a centrifugal will not put it into surge.
>
Regards, Greg