This year, a simulated low-pressure turbine (LPT) was tested in NASA Lewis Research Center's CW-7 facility. This experimental test program is part of the collaborative NASA/industry/academia LPT Flow Physics program. The top figure is a carpet plot showing velocity and streamline profiles for a Reynolds number of approximately 100,000 and a free-stream turbulence intensity of 0.8 percent (grid 0). The top plot shows a separation bubble occurring at an axial location of 5.25 in. on the flat plate ( x measured from the leading edge of the bottom test plate) of the simulated LPT test section. The flow reattaches turbulently at an axial location of approximately 6.75 in., and the reattachment is corroborated by the intermittency profiles shown in the bottom figure for the same test conditions.
This program is ongoing. Future tests are planned to focus on the behavior of the separation bubble as a function of the Reynolds number and free-stream turbulence intensity.
Lewis contacts: Rickey J. Shyne, (216) 433-3595,
Rickey.J.Shyne@grc.nasa.gov,
and Dr. Ki-Hyeon Sohn, (216) 433-5949,
Ki-Hyeon.Sohn@grc.nasa.gov
Authors: Rickey J. Shyne and Dr. Ki-Hyeon Sohn
Headquarters program office: OASTT
Programs/Projects: LPT Flow Physics, AST, ReCAT
Previous articleLast updated April 15, 1998, by Nancy.L.Obryan@nasa.gov
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