The three-dimensional viscous flow field development in the nozzle passage of an axial flow turbine stage was measured using a “x” hot-wire probe. The measurements were carried out at two axial stations on the endwall and vane surfaces and at several spanwise and pitchwise locations. Static pressure measurements and flow visualization, using a fluorescent oil technique, were also performed to obtain the location of transition and the endwall limiting streamlines. The boundary layers on the vane surface were found to be very thin and mostly laminar, except on the suction surface downstream of 70 percent axial chord. Strong radial pressure gradient, especially close to the suction surface, induces strong radial flow velocities in the trailing edge regions of the blade. On the endwalls, the boundary layers were much thicker, especially near the suction corner of the casing surface, caused by the secondary flow. The secondary flow region near the suction surface-casing corner indicated the presence of the passage vortex detached from the vane surface. The boundary layer code accurately predicts the three-dimensional boundary layers on both vane surfaces and endwall in the regions where the influence of the secondary flow is small.
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September 1998
Research Papers
Three-Dimensional Blade Boundary Layer and Endwall Flow Development in the Nozzle Passage of a Single Stage Turbine
D. Ristic,
D. Ristic
Center for Gas Turbines & Power, Pennsylvania State University, University Park, PA 16802
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B. Lakshminarayana
B. Lakshminarayana
Center for Gas Turbines & Power, Pennsylvania State University, University Park, PA 16802
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D. Ristic
Center for Gas Turbines & Power, Pennsylvania State University, University Park, PA 16802
B. Lakshminarayana
Center for Gas Turbines & Power, Pennsylvania State University, University Park, PA 16802
J. Fluids Eng. Sep 1998, 120(3): 570-578 (9 pages)
Published Online: September 1, 1998
Article history
Received:
February 15, 1996
Revised:
February 24, 1998
Online:
January 22, 2008
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Ristic, D., and Lakshminarayana, B. (September 1, 1998). "Three-Dimensional Blade Boundary Layer and Endwall Flow Development in the Nozzle Passage of a Single Stage Turbine." ASME. J. Fluids Eng. September 1998; 120(3): 570–578. https://doi.org/10.1115/1.2820700
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