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Performance of Thermal Mass Flow Meters in a Variable Gravitational Environment (Paperback)
Loot Price: R418
Discovery Miles 4 180
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Performance of Thermal Mass Flow Meters in a Variable Gravitational Environment (Paperback)
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Loot Price R418
Discovery Miles 4 180
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Total price: R438
Discovery Miles: 4 380
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The performance of five thermal mass flow meters, MKS Instruments
179A and 258C, Unit Instruments UFM-8100, Sierra Instruments 830L,
and Hastings Instruments HFM-200, were tested on the KC-135 Reduced
Gravity Aircraft in orthogonal, coparallel, and counterparallel
orientations relative to gravity. Data was taken throughout the
parabolic trajectory where the g-level varied from 0.01 to 1.8
times normal gravity. Each meter was calibrated in normal gravity
in the orthogonal position prior to flight followed by ground
testing at seven different flow conditions to establish a baseline
operation. During the tests, the actual flow rate was measured
independently using choked-flow orifices. Gravitational
acceleration and attitude had a unique effect on the performance of
each meter. All meters operated within acceptable limits at all
gravity levels in the calibrated orthogonal position. However, when
operated in other orientations, the deviations from the reference
flow became substantial for several of the flow meters. Data
analysis indicated that the greatest source of error was the effect
of orientation, followed by the gravity level. This work emphasized
that when operating thermal flow meters in a variable gravity
environment, it is critical to orient the meter in the same
direction relative to gravity in which it was calibrated.
Unfortunately, there was no test in normal gravity that could
predict the performance of a meter in reduced gravity. When
operating in reduced gravity, all meters indicated within 5 percent
of the full scale reading at all flow conditions and orientations.
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