Wake-induced unsteady stagnation-region heat-transfer measurements

Conference · Wed Jan 01 04:00:00 EST 1992

OSTI ID:6345626

Magari, P J; Lagraff, L E ^[1]

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1. Syracuse Univ., NY (United States)

Results of an experimental investigation of wake-induced unsteady heat transfer in the stagnation region of a cylinder are presented. A quasi-steady representation of the stator/rotor interaction in a gas turbine using two stationary cylinders in crossflow is created. Time-averaged and time-resolved heat-transfer results are obtained over a wide range of Reynolds numbers at two Mach numbers: one incompressible and one transonic. The augmentation of the heat transfer in the stagnation region due to wake unsteadiness is documented by comparison with isolated cylinder tests. The time-averaged heat-transfer rate at the stagnation line, expressed in terms of the Frossling number, is found to reach a maximum independent of the Reynolds number. The power spectra and cross correlation of the heat-transfer signals in the stagnation region reveal the importance of large vortical structures shed from the upstream wake generator. 30 refs.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (United States). Lewis Research Center
• OSTI ID: 6345626
• Report Number(s): AIAA-Paper--92-GT-196; CONF-920602--; CNN: NAG3-621
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
CYLINDERS
ENERGY TRANSFER
EQUIPMENT
FLUID FLOW
GAS TURBINES
HEAT TRANSFER
MACHINERY
STAGNATION POINT
TEMPERATURE MEASUREMENT
TURBINE BLADES
TURBINES
TURBOMACHINERY
UNSTEADY FLOW
VORTEX FLOW
VORTICES