Experiments measuring the leakage rate through hole-pattern seals operating at high pressures of up to 8400 kPa reveal the presence of an abrupt variation in the friction factor (up to a factor of three) with change in the pressure difference across the seal. The measured pressure fluctuations suggest that this observation may, perhaps, be understood as a change in fluid instability modes across the cavities of the seal. A more detailed investigation via large eddy simulations (LES) suggest that the switching from shear layer instability mode to a wake instability mode, a phenomenon well known in fundamental studies of cavity flow (without a top bounding wall), is responsible for the observed variation.
An Inquiry of the Friction Factor “Jump” Phenomenon in Hole-Pattern Seals
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received March 18, 2015; final manuscript received February 25, 2016; published online May 2, 2016. Assoc. Editor: Mark F. Tachie.
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Sekaran, A., Morrison, G., and Ranjan, D. (May 2, 2016). "An Inquiry of the Friction Factor “Jump” Phenomenon in Hole-Pattern Seals." ASME. J. Fluids Eng. August 2016; 138(8): 081102. https://doi.org/10.1115/1.4033023
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