Gas flow area measurement
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United States of America Patent
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Nov 21, 2000
Grant Date -
N/A
app pub date -
Oct 8, 1998
filing date -
Mar 13, 1998
priority date (Note) -
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Abstract
The effective flow area of a restriction in a gas flow passage, such as that of a gas turbine nozzle or vane, is determined by use of a large reservoir containing pressurized gas which is discharged through the passage in a blowdown operation in which the ratio of back pressure of the restriction to gas pressure in the reservoir is maintained below critical for sonic flow; a timer may be used to measure the time for a predetermined fall of pressure in the reservoir whilst there is sonic flow through the restriction.
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