Flush-mounted dynamic pressure transducers were installed on the center airfoil of a transonic oscillating cascade to measure the unsteady aerodynamic response as nine airfoils were simultaneously driven to provide 1.2 deg of pitching motion about the midchord. Initial tests were performed at an incidence angle of 0.0 deg and a Mach number of 0.65 in order to obtain results in a shock-free compressible flow field. Subsequent tests were performed at an angle of attack of 7.0 deg and a Mach number of 0.80 in order to observe the surface pressure response with an oscillating shock near the leading edge of the airfoil. Results are presented for interblade phase angles of 90 and −90 deg and at blade oscillatory frequencies of 200 and 500 Hz (semichord reduced frequencies up to about 0.5 at a Mach number of 0.80). Results from the zero-incidence cascade are compared with a classical unsteady flat-plate analysis. Flow visualization results depicting the shock motion on the airfoils in the high-incidence cascade are discussed. The airfoil pressure data are tabulated.
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January 1986
Research Papers
Unsteady Pressure Measurements on a Biconvex Airfoil in a Transonic Oscillating Cascade
L. M. Shaw,
L. M. Shaw
National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH
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D. R. Boldman,
D. R. Boldman
National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH
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A. E. Buggele,
A. E. Buggele
National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH
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D. H. Buffum
D. H. Buffum
Purdue University, West Lafayette, IN
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L. M. Shaw
National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH
D. R. Boldman
National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH
A. E. Buggele
National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH
D. H. Buffum
Purdue University, West Lafayette, IN
J. Eng. Gas Turbines Power. Jan 1986, 108(1): 53-59 (7 pages)
Published Online: January 1, 1986
Article history
Received:
January 18, 1985
Online:
October 15, 2009
Citation
Shaw, L. M., Boldman, D. R., Buggele, A. E., and Buffum, D. H. (January 1, 1986). "Unsteady Pressure Measurements on a Biconvex Airfoil in a Transonic Oscillating Cascade." ASME. J. Eng. Gas Turbines Power. January 1986; 108(1): 53–59. https://doi.org/10.1115/1.3239885
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