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11] found the effect of grid-generated (~7%) turbulence to be similar to a two order of magnitude increase in Ra (as determined by the blade mean heat transfer coefficient). The combined effect of turbulence and roughness was approximately additive. A similar finding was reported by Bogard et al. [20] for turbulence levels up to 17%. Finally, the results reported by Hoffs et al. [12] using 5% and 10% turbulence in a cascade facility with rough blades lack sufficient detail to determine whether roughness and turbulence effects are complementary.

D Dissertation. Mississippi State University. 1983. -32- Submitted for: IGTI 2002. St and cf Augmentation for Real Turbine Roughness with Elevated Freestream Turbulence J. Bons Associate Professor Air Force Institute of Technology Abstract Experimental measurements of skin friction (cf) and heat transfer (St) augmentation are reported for low speed flow over scaled turbine roughness models. The models were scaled from surface measurements taken on actual, in-service land-based turbine hardware.

The normalized temperatures are defined as shown in equations (21 a, b). θ= Tb − Te Tw − Te , θw = T ( y ) − Te Tw − Te (21 a, b) The solid line in Figure 12 is the normalized temperature of the cones at the given height, the dashed line is the normalized temperature of the fluid at the given height, and the dotted line is the normalized velocity (u/U e) of the fluid at the given height. 97%. 4% of the total Stanton number. 0034. Thus, temperature change along the roughness element is responsible for some of the difference between the measured and the predicted Stanton numb er for the Erosion Cone surface and the Erosion 2 surface.

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Advanced Gas Turbine Systems Research [qtly prog rpt]

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