Method for measuring the control cross section area of a nozzle
AssigneeRobert Bosch GmbH
InventorsJurgen Abt, Sybille Stumpf, Ulrich Kuhn, Werner Banzhaf, Gerhard Felten, Gerold Lemperle, Michael Specker
Life of this patent
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Abstract
The method for measuring the cross-sectional area of a nozzle by a pneumatic through-flow method with supercritical pressure ratio measures the volume flow flowing through the nozzle on its input side by a differential pressure measurement at a resistance distance through which a laminar flow passes. Deviations of the temperature of the test medium from a reference value are determined by a temperature sensor and accounted for via a correction factor.
Claims10
A method for measuring a control cross-section area of a nozzle, comprising the steps of providing a pneumatic through-flow of a medium through a nozzle with supercritical pressure ratio of pressures in back and in front of the nozzle;
- measuring the flow passing through the nozzle as a volume flow (V.sub.E) on an input side of the nozzle;
- and determining a control cross-section area of the nozzle as follows:
- A=K'.multidot.V.sub.E (1-0.0017(.delta..sub.E -20.degree. C.))
- wherein
- K' is a constant variable for the medium and
- .delta..sub.E is the temperature (in .degree.Celsius) of the test medium in front of the nozzle.
Dependencies are inferred from the claim text.