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Intermittent-flow coefficients of a poppet valveFlow coefficients were determined for the inlet valve of a modern air-cooled cylinder during operation of the valve. The cylinder head with valves was mounted on a large tank that could be evacuated. Operating the valve with a rotating cam allowed air to flow through the valve into the evacuated tank. The change of pressure in the tank was a measure of the amount of air flowing though the valve in a given number of cycles. The flow coefficients were determined from the pressure across the valve, the quantity of air flowing, and the valve-lift curve. Coefficients were measured with lifts of 0.1 to 0.6 inch and speeds of 130 to 1,200 r.p.m. The results obtained with intermittent flow were compared with the results of tests made with steady flow through this cylinder head. This comparison indicated that steady-flow coefficients can be used for intermittent flow.
Document ID
19930081426
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Waldron, C D
Date Acquired
September 6, 2013
Publication Date
April 1, 1939
Report/Patent Number
NACA-TN-701
Accession Number
93R10716
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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