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Title: The Premature Unchoking Phenomena Of Critical Flow Venturis
Author: Richard W. Caron, Charles L. Britton, Thomas m. Kegel
Source: 2004 Measurement Science Conference
Year Published: 2004
Abstract: The choking pressure ratio (CPR) for a Critical Flow Venturi (CFV) is defined as the ratio of the maximum permissible exit pressure to the inlet pressure that can exist across the venturi and still maintain sonic velocity at the throat. One dimensional isentropic flow theory states that when sonic velocity exists in the throat of a CFV, the throat static pressure is at a given percentage of the inlet stagnation pressure. The exact value is dependent upon the specific heat ratio of the gas. For air, the throat static pressure should be 0.528 of the inlet stagnation pressure. A conical diffuser is attached downstream of the throat of a CFV to assist in the pressure recovery of the device. Actual test data has shown that the static pressure downstream of the CFV can be substantially higher than the 0.528 pressure ratio between the inlet and throat. The seemingly obvious conclusion that can be drawn is that the minimum CPR for any CFV will be equal to 0.528 or higher.

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