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2. Lateral noise attenuation of the advanced propeller of the propfan test assessment aircraft

Author

Chambers, F. W, Reddy, N. N, and Bartel, H. W

Subjects
Acoustics
Abstract

Lateral noise attenuation characteristics of the advanced propeller are determined using the flight test results of the testbed aircraft, Propfan Test Assessment (PTA), with a single, large-scale propfan. The acoustic data were obtained with an array of ground-mounted microphones positioned at distances up to 2.47 km (8100 feet) to the side of the flight path. The aircraft was flown at a Mach number of 0.31 for a variety of operating conditions. The lateral noise attenuation in a frequency range containing the blade passage frequency of the propeller was found to have positive magnitudes on the propfan side and negative magnitudes on the opposite side. The measured attenuation exhibits a strong dependence upon the elevation angle. The results also display a clear dependence upon the angle at which the propeller and nacelle are mounted on the wing (inflow angle).

Published
1989

3. Jets in ground effect with a crossflow.

Author

Barata, Jorge M. M. and Chambers, F. W.

Subjects
*TURBULENCE, *STOPPING power (Nuclear physics), *STRUCTURAL failures, *MEASUREMENT
Abstract

Focuses on a study concerning the budgets of turbulent kinetic energy in the vicinity of the stagnation zone created by the impingement of a turbulent jet on a flat plate through a low-velocity crossflow. Errors incurred in the measurements of the velocity characteristics of normal impinging jets; Reasons for the failure of the turbulence model; Conclusions.

Published
1998
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4. Acoustic Interaction with a Turbulent Plane Jet.

Author

PURDUE UNIV LAFAYETTE IND RAY W HERRICK LABS, Chambers,F W, Williams,Frank, Goldschmidt,V W, PURDUE UNIV LAFAYETTE IND RAY W HERRICK LABS, Chambers,F W, Williams,Frank, and Goldschmidt,V W

Abstract

Effects of a transverse acoustic field upon properties of a turbulent plant jet were investigated. The jet Reynolds number was 6000. Mean pressure profiles were measured to determine the jet widening rate, velocity decay rate, and virtual origins for applied pure tone acoustic frequencies of 200 Hz to 4200 Hz. Turbulent intensities, Reynolds shear stresses, and turbulent energy spectra were measured without an acoustic disturbance, and with disturbance frequencies of 700 Hz and 1600 Hz. Intensities were measured along the jet centerline from X/D = 0 to X/D = 80. Spectra were measured in the jet shear layer and along the centerline from X/D = 0 to X/D = 40. Intensities and shear stresses were measured at X/D = 20, 40, and 60 from Y/B = 0 to Y/B = 2. Assumptions of self-similarity were employed in calculations of the mass flow rates, entrainment rates, Reynolds shear stresses, and shear stress turbulent energy production in the main region of the jet.

Published
1977

5. SEA-WATER RADIOLOGICAL MONITORING METHODS

Author

NAVAL MEDICAL RESEARCH INST BETHESDA MD, Duckworth,J. W., Chambers,F. W., Chapman,W. H., Severance,R. E., NAVAL MEDICAL RESEARCH INST BETHESDA MD, Duckworth,J. W., Chambers,F. W., Chapman,W. H., and Severance,R. E.

Abstract

The dispersal in time and sea of radioactive contamination produced by a deep underwater atomic blast was studied. Instrumentation methods obtained radiation intensity versus depth information for several surface locations and continuously monitored a sea-water intake line aboard ship. Surface contamination measurements were also made. This work was performed in conjunction with marine biological surveys by the University of Washington and oceanographic studies by the Naval Hydrographic Office. (Author), Report on Operation Hardtack, Proj. 40.1 (U).

Published
1958

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