Experimental Investigations on Challenging Thermal-Fluids Problems Pertinent to Aero-Engines
Release time：December 2, 2016 /
Speaker：Professor Hui Hu
Date：8th, Dec, 2016 (Thursday) 9:00 AM
Venue：ROOM D419，the new main building
The talk will start with a brief introduction of the research efforts made in the speakers’ group in exploring innovative film cooling strategies for improved protection of hot gas turbine blades from harsh environment. The effectiveness of novel film cooling designs with coolant injection from Barchan-Dune-Shaped ramps and Barchan-Dune-Shaped injection compounds were evaluated experimental, in comparison to that of conventional circular holes. While a high-resolution Particle Image Velocimetry (PIV) system was used to conduct detailed flow field measurements to quantify the dynamic mixing process between the coolant streams and the mainstream flows over the test models, Pressure Sensitive Paint (PSP) technique was used to map the corresponding adiabatic film cooling effectiveness on the surface of interest based on a mass-flux analog to traditional temperature-based cooling effectiveness measurements. The measured effectiveness maps were correlated with the characteristics of the flow structures revealed from the detailed PIV measurement in order to elucidate underlying physics to explore/optimize design paradigms for a better protection of the critical components of turbine blades.
The second part of the talk will introduce the speaker’s recent research to investigate the dynamic ice accretion process over the surfaces of aero-engine spinners as aircraft with aero-engines flying in the icing clouds with super-cooled water droplets. The experimental studies are conducted in a unique Icing Research Tunnel available at Iowa State University (ISU-IRT). The transient ice accretion processes over a rotating aero-engine fan model with three typical spinner shapes (i.e., conical, coniptical and elliptical shaped spinners) were studied under different conditions. In addition to examining the transient behavior of surface water runback and dynamic ice accreting process over the surfaces of the engine spinners by using a high-speed imaging system, the resultant aerodynamic forces, power consumption, and rotation speed of the fan-spinner models under different icing conditions (i.e., either dry rime icing or wet glaze icing conditions) were also quantified during the experiments.
Brief Intro of the speaker:
Dr. Hui Hu is the Martin C. Jischke Professor and Assoc. Dept. Chair for Graduate Eduction of Aerospace Engineering at Iowa State University. Dr. Hu’s recent research interests include laser-based advanced flow diagnostics, aircraft icing physics and anti-icing/de-icing technology; film cooling and thermal management of gas turbines; wind turbine aerodynamics and rotorcraft aeromechanics; low-speed aerodynamics and vortex flow controls; bio-inspired aerodynamics of unmanned-aerial-vehicles (UAVs); micro-flows and micro-scale heat transfer in microfluidics or “Lab-on-a-Chip” devices; wind engineering and fluid-structure interactions (FSI) of built structures in violent tornado, microburst and snow wind storms. Dr. Hu received several prestigious awards in recent years, including 2006 NSF-CAREER Award, 2007 Best Paper in Fluid Mechanics Award (Measurement Science and Technology, IOP Publishing), 2009 AIAA Best Paper Award in Applied Aerodynamics, 2012 Mid-Career Achievement in Research Award of Iowa State University, 2013 AIAA Best Paper Award in Ground Testing Technology, and 2014 Renewable Energy Impact Award of Iowa Energy Center. Further information about Dr. Hu’s technical background and recent research activities is available at: http://www.aere.iastate.edu/~huhui/