HEAT TRANSFER MEASUREMENTS IN ROTATING BLADE-SHAPE SERPENTINE COOLANT PASSAGE WITH RIBBED WALLS AT HIGH REYNOLDS NUMBERS Conference Paper uri icon

abstract

  • Flow in the internal three-pass serpentine rib turbulated passages of an advanced high pressure rotor blade is simulated on a 1:1 scale in the laboratory. Tests to measure the effect of rotation on the Nusselt number are conducted at rotation numbers up to 0.4 and Reynolds numbers from 75,000 to 165,000. To achieve this similitude, pressurized Freon R134a vapor is utilized as the working fluid. Experimental heat transfer coefficient measurements are made using the copperplate regional average method. Regional heat transfer coefficients are correlated with rotation numbers. An increase in heat transfer rates due to rotation is observed in radially outward passes; a reduction in heat transfer rate is observed in the radially inward pass. Strikingly, a significant deterioration in heat transfer is noticed in the hub region between the radially inward second pass and the radially outward third pass. This heat transfer reduction is critical for turbine cooling designs.

name of conference

  • Volume 3A: Heat Transfer

published proceedings

  • PROCEEDINGS OF THE ASME TURBO EXPO: TURBINE TECHNICAL CONFERENCE AND EXPOSITION, 2013, VOL 3A

author list (cited authors)

  • Rallabandi, A., Lei, J., Han, J., Azad, S., & Lee, C.

citation count

  • 0

complete list of authors

  • Rallabandi, Akhilesh||Lei, Jiang||Han, Je-Chin||Azad, Salam||Lee, Ching-Pang

publication date

  • June 2013