Effect of an Oscillating Flow Direction on Leading Edge Heat Transfer
| Autor: | M. L. Marziale, R. E. Mayle |
|---|---|
| Rok vydání: | 1984 |
| Předmět: |
Physics
Leading edge Turbine blade Turbulence Mechanical Engineering Energy Engineering and Power Technology Aerospace Engineering Reynolds number Thermodynamics Mechanics Heat transfer coefficient law.invention Physics::Fluid Dynamics symbols.namesake Fuel Technology Nuclear Energy and Engineering law Heat transfer symbols Strouhal number Wind tunnel |
| Zdroj: | Journal of Engineering for Gas Turbines and Power. 106:222-228 |
| ISSN: | 1528-8919 0742-4795 |
| DOI: | 10.1115/1.3239538 |
| Popis: | An experimental investigation was conducted to examine the effect of a periodic variation in the angle of attack on heat transfer at the leading edge of a gas turbine blade. A circular cylinder was used as a large-scale model of the leading edge region. The cylinder was placed in a wind tunnel and was oscillated rotationally about its axis. The incident flow Reynolds number and the Strouhal number of oscillation were chosen to model an actual turbine condition. Incident turbulence levels up to 4.9 percent were produced by grids placed upstream of the cylinder. The transfer rate was measured using a mass transfer technique and heat transfer rates inferred from the results. A direct comparison of the unsteady and steady results indicate that the effect is dependent on the Strouhal number, turbulence level, and the turbulence length scale, but that the largest observed effect was only a 10 percent augmentation at the nominal stagnation position. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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