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Time-resolved measurements of total temperature and pressure in the vortex street behind a cylinder (1990)

Ng, W. F. ; Chakroun, W. M. ; Kurosaka, M.

New York, NY : American Institute of Physics (AIP)

Physics of Fluids 2 (1990), S. 971-978

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ISSN: 1089-7666

Source: AIP Digital Archive

Topics: Physics

Notes: Recent theoretical and numerical investigations revealed the prospect that the instantaneous total temperature becomes separated around vortices; once time averaged, however, the wake behind a bluff body takes the guise of a colder wake, displaying the so-called Eckert–Weise effect. For low Mach number flows, the instantaneous total pressure was also shown to become separated in such a similar manner that the near-wake patterns of instantaneous total pressure exhibit almost exact facsimiles of those of total temperature. In this paper the results from the time-accurate measurements of fluctuating total temperature and pressure are presented. The data were obtained by placing a time-resolved aspirating probe in the vortex street behind a cylinder. The free-stream Mach number was 0.4 and the Reynolds number based on the cylinder diameter was 2.3×105. The maximum magnitude of the rms fluctuations of total temperature are of the order of 15 ° K—about 5% of the upstream total temperature. Maximum fluctuations in total pressure are approximately 10% of the upstream total pressure. Not only are the time traces of the total temperature and pressure taken in the near-wake qualitatively similar, but also quantitatively they agree with the predictions.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.857604

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A concentration probe for the study of mixing in supersonic shear flows (1992)

Ninnemann, T. A. ; Ng, W. F.

Springer

Experiments in fluids 13 (1992), S. 98-104

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ISSN: 1432-1114

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract An aspirating hot-film probe is developed to measure local mean gas composition in supersonic flows. The probe consists of a constant temperature hot-film sensor operating in a channel with a choked exit. Thus, the flow over the hot film is influenced only by total temperature, total pressure, and gas concentration. The use of the probe requires a separate measurement of the total temperature in the gas flow. The probe has a spatial resolution of 0.011 in. and shows acceptable sensitivity to flow angularity. The probe is used in the study of an unheated supersonic air/helium mixing layer in a 23 cm × 23 cm supersonic wind tunnel. Data are presented in raw form and after reduction to concentration and mean flow quantities.