The Large Cavitation Channel (LCC) has very tight performance
specifications for the flow quality in the test section, both for uniformity of
the mean velocity profiles and turbulence levels. The mean velocity profiles
have been addressed experimentally in the Task A report, and mathematically in
the Task B report. This task is concerned with the turbulence levels in the
test section. Turbulence levels are partially controlled bY,honeycomb design.
Model studies of honeycombs should be conducted at as high a Reynolds number as
possible to reduce scale effects. Thus, the decision was made not to utilize
the undistorted 1 to 10 scale model of the preliminary Kempf and Remmers (K&R)
contraction, test section, and diffuser that was used in the Task A studies as
the Reynolds number based on honeycomb parameters was judged to be too low to
obtain meaningful results. The existing wind tunnnel facility was modified for
the turbulence measurements in rather an unique manner so that full scale
honeycombs could be evaluated. These modifications were made after the tests of
the Task A program were completed. Results of the turbulence measurements and
recommendations for a turbulence management system for the LCC are discussed in
the following sections.
Wetzel, Joseph M; Bintz, D. W.; Song, Charles C. S..
Phase A-2, Large Cavitation Channel, David Taylor Naval Ship Reasearch and Development Center.
St. Anthony Falls Laboratory.
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