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Title: Blow-Down Tests Confirm Accurate Critical Flow Venturi Measurements During Transients
Author: John D. Wright
Source: 2009 International Symposium on Fluid Flow Measurement
Year Published: 2009
Abstract: Critical flow venturis (CFVs) can be used to measure flow under transient pressure, temperature, and flow conditions with k 2 uncertainties of 0.4 % or less. Blow-down tests transferred 630 g of nitrogen during a 100 s interval from an unregulated cylinder (initially at 10 MPa) through a CFV into a known collection volume. Fast pressure and temperature sensors monitored the inlet to the CFV. The integrated CFV mass flows, ? m?? dt , averaged 0.38 % smaller than the mass ??V of the collected gas. To reduce temperature transients at the CFV, a heat exchanger was added upstream of it. The heat exchanger reduced the percentage difference ? m?? dt /(??V) - 1 to 0.04 %. Accurate measurements of transient flows require careful measurements of the gas temperature near the throat of the CFV and careful attention to thermal effects on the CFV discharge coefficient. We conclude that a properly instrumented critical nozzle can be used

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