Probe shapes that measure time-averaged streamwise momentum and

Details Probe shapes that measure time-averaged streamwise momentum and Probe shapes that measure time-averaged streamwise momentum and

1991-02-21

1993-09-07

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

Using differential pressure

7317014, 73147, 73180, G01F 146

Patent

active

052418669

ABSTRACT:
A method and apparatus for directly measuring the time-averaged streamwise momentum in a turbulent stream use a probe which has total head response which varies as the cosine-squared of the angle of incidence. The probe has a nose with a slight indentation on its front face for providing the desired response. The method of making the probe incorporates unique design features. Another probe may be positioned in a side-by-side relationship to the first probe to provide a direct measurement of the total pressure. The difference between the two pressures yields the sum of the squares of the cross-stream components of the turbulence level.

REFERENCES:
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"Applied Hydro- and Aeromechanics" O. G. Tietjens, Engineering Societies Monographs 1934, pp. 226-235.
Luftfahrtforschung, vol. XII, No. 2, May 16, 1935, Technical Memorandums National Advisory Committee for Aeronautics, No. 775, "Total-Head Meter with Small Sensitivity to Yaw" by G. Kiel, pp. 1-6, FIGS. 1-13.
Technical Notes, National Advisory Committee for Aeronautics, No. 546, "Comparative Tests of Pitot-Static Tubes", by Kenneth G. Merriam et al., Nov. 1935, pp. 1-5 and 32.
"A Note on the Measurement of Total Head and Static Pressure in a Turbulent Stream", S. Goldstein, pp. 570-575.
"Considerations Entering into the Selection of Probes for Pressure Measurement in Jet Engines", C. C. Gettelman et al., Instrument Society of America, Aeronautics Inst. Session 11, Paper No. 52-12-1, pp. 134-137.
"On the Static Pressure in Fully-Developed Turbulent Flow", A. Page, Proc. Roy. Society of London, Series A, vol. 155, Jul. 1, 1936, pp. 576-596.
National Advisory Committee for Aeronautics, ACR No. 3L23, Wartime Report, "Investigation of Flow in an Axially Symmetrical Heated Jet of Air", S. Corrsin, pp. 1-34 and FIGS. 1-43.
"Response of Pitot probes in turbulent streams", H. A. Becker et al., J. Fluid Mech. (1974), vol. 62, part 1, pp. 85-114.

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