– Impingement Cooling
– Impingement Jet Array Heat Transfer With Surface Textures
– Surface Roughness Characterization and Analysis
– Dimple Surface Arrays
– Swirl Chambers
– Surface Heat Transfer Augmentation Within Internal Passages
– Film Cooling
– Full-Coverage Film Cooling
– Double Wall Cooling
– Second Law Analysis of Film Cooling
– Aerodynamic Losses From Turbine Airfoils
– Transonic Turbine Blade Tips
– Transonic Turbine Blade Tips With Film Cooling
– Supersonic Flow Experimental Results
– Shock Wave Unsteady Interactions
– Viscous Dissipation Within a Transonic Flow Environment
– Transitional Flows in Curved Channels
– Dean Flow Dynamics in Low-Aspect Ratio Spiral Microchannels
– Unsteady Laminar Impinging Slot Jets
– Electronics Cooling
– Miniature and Micro-Scale Pumps
– Slip Rarefaction Phenomena
– Elastic Instabilities
– Buoyancy-Driven Continuous SPLITT Fractionation
SWIRL CHAMBERS
Swirl Chambers
● In order to obtain higher thermal efficiencies for modern gas turbines, the first turbine stages are exposed to extremely high hot gas temperatures, which are nowadays well above the melting temperature of the blade material.
● As a consequence, the turbine blades need to be actively cooled, especially for the leading edge area of the blade, which normally is exposed to the highest thermal loads.
● Additive manufacturing offers new possibilities in the design of complex cooling geometries, enabling higher heat transfer rates and allowing the development and use of confined swirling flows, often referred to as swirl cooling, screw cooling or vortex cooling.
● Such confined swirling flows are especially useful for enhanced thermal protection as they are applied to the interior portions of leading edge regions of turbine blades and vanes of gas turbine engines.
REFERENCES:
Flow Phenomena in Swirl Chambers (P. M. Ligrani, C. R. Hedlund, R. Thambu, B. T. Babinchak, H-K. Moon, and B. Glezer), Experiments in Fluids, Vol. 24, No. 3, pp. 254-264, March 1998.
Flow in a Simple Swirl Chamber With and Without Controlled Inlet Forcing (R. Thambu, B. T. Babinchak, P. M. Ligrani, C. R. Hedlund, H-K. Moon, and B. Glezer), Experiments in Fluids, Vol. 26, No. 4, pp. 347-357, March 1999.
Heat Transfer and Flow Phenomena in a Swirl Chamber Simulating Turbine Blade Internal Cooling (C. R. Hedlund, P. M. Ligrani, H.-K. Moon, B. Glezer), ASME Transactions-Journal of Turbomachinery, Vol. 121, No. 4, pp. 804-813, October 1999.
Heat Transfer in a Swirl Chamber at Different Temperature Ratios and Reynolds Numbers (C. R. Hedlund, P. M. Ligrani, B. Glezer, and H.-K. Moon), International Journal of Heat and Mass Transfer, Vol. 42, No. 22, pp. 4081-4091, November 1999.
Local Swirl Chamber Heat Transfer and Flow Structure at Different Reynolds Numbers (C. R. Hedlund, and P. M. Ligrani), ASME Transactions-Journal of Turbomachinery, Vol. 122, No. 2, pp. 375-385, April 2000.
Flow and Heat Transfer Characteristics in a Pre-Swirl Rotor-Stator Cavity (X. Yang, X. Li, Z. Ren, J. Ren, and P. M. Ligrani), International Journal of Thermal Sciences, Vol. 172, Part A, Paper No. 107271, pp. 1- 13, February 2022.
Flow and Heat Transfer in Swirl Tubes – A Review (F. Seibold, P. M. Ligrani, and B. Weigand), Invited Journal Paper, International Journal of Heat and Mass Transfer, Vol. 187, Paper No. 122455, pp. 1- 26, May 2022.
Particulate Deposition Effects on Internal Swirl Cooling of Turbine Blades (X. Yang, Z. Hao, F. Seibold, Z. Feng, P. M. Ligrani, and B. Weigand), ASME Transactions – Journal of Engineering for Gas Turbines and Power, Vol. 145, No. 5, Paper No. 051020, pp. 1-13, May 2023.
Heat Transfer in Convergent Swirl Chambers for Cyclone Cooling in Turbine Blades (F. Seibold, P. M. Ligrani, X. Yang, R. Poser, and B. Weigand), Applied Thermal Engineering, Volume 230, Part B, Paper No. 120744, pp. 1-18, July 2023.
Conjugate Heat Transfer Evaluation of Turbine Blade Leading-Edge Swirl and Jet Impingement Cooling with Particulate Deposition (X. Yang, Z. Hao, Z. Feng, P. M. Ligrani, and B. Weigand), ASME Transactions – Journal of Turbomachinery, Vol. 146, No. 1, Paper No. 011003, pp. 1-16, January 2024.
Experimental and Numerical Investigation of Jet Impingement Cooling onto a Rib Roughened Concave Internal Passage for Leading Edge Cooling of a Gas Turbine Blade (M. Forster, P. M. Ligrani, B. Weigand, and R. Poser), International Journal of Heat and Mass Transfer, Volume 227, Paper No. 125572, pp. 1-15, August 2024.