– 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
– Transonic Turbine Alloy Blades
– 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
SHOCK WAVE UNSTEADY INTERACTIONS
Shock Wave Unsteady Interactions
● Considered are interactive relationships between a normal shock wave and the downstream shock wave leg of the associated lambda foot, as well as between a normal shock wave and time-varying static pressure as measured along the bottom surface of a specially constructed test section.
● Such relationships are investigated as they vary with two different magnitudes of inlet unsteady Mach wave intensity, and are characterized using shadowgraph flow visualization data, as well as power spectral density, magnitude squared coherence, and time lag data.
● Employed for the investigation is a specialty test section with an inlet Mach number of 1.54, as utilized within a transonic/supersonic wind tunnel.
● Resulting data provide evidence of distinct interactions over a wide range of frequencies between the normal shock wave and the downstream shock wave leg of the lambda foot for low inlet unsteady Mach wave intensity, which are not present in the same form and over the same ranges of frequency with high inlet unsteady Mach wave intensity.
REFERENCES:
Analysis of Shock Wave Unsteadiness Using Space and Time Correlations Applied to Shadowgraph Flow Visualization Data (S. R. Marko, and P. M. Ligrani), Advances in Aerodynamics, Vol. 1, No. 2, pp. 1-25, February 2019.
Parametric Study of Wind Tunnel Test Section Configurations For Stabilizing Normal Shock Wave Structure (P. M. Ligrani, and S. R. Marko), Shock Waves, Vol. 30, No. 1, pp. 77-90, January 2020.
Recent Investigations of Shock Wave Effects and Interactions (P. M. Ligrani, E. McNabb, H. Collopy, M. Anderson, S. R. Marko), Advances in Aerodynamics, Vol. 2, Article No. 4, pp. 1-23, February 2020.
Statistical Analysis of Unsteady, Spatially-Varying Shock Wave Characteristics within a Supersonic Flow Environment (W. Manneschmidt, and P. M. Ligrani), International Journal of Statistics and Applications, Vol. 13, No. 1, pp. 13-19, July 2023.
Normal Shock Wave Coherence Relative to Other Flow Events With High and Low Levels of Inlet Mach Wave Unsteadiness (W. Manneschmidt, P. M. Ligrani, M. Sorrell, A. M. Ciccarelli, and B. Weigand), Shock Waves, Vol. 34, pages 497–513, November 2024.
Unsteady Relationships Between Instantaneous Surface Heat Flux, Instantaneous Surface Temperature, and Tracked Shock Wave Phenomena (M. Sorrell, W. Manneschmidt, and P. M. Ligrani), International Journal of Thermal Sciences, Vol. 208, Paper No. 109397, pp. 1-13, February 2025.
Coherent Interactions Between Test Section Inlet Unsteadiness, Surface Temperature Fluctuations, and Shock Wave Phenomena with Different Levels of Inlet Turbulence Intensity (W, Manneschmidt, and P. M. Ligrani), Paper Number AIAA-2025, 2025 AIAA Science and Technology Forum and Exposition (AIAA SciTech Forum), American Institute of Aeronautics and Astronautics, Hyatt Regency Orlando, Orlando, FL, USA, January 6-10, 2025.