Ultrawide BAndwidth simultaneous diagnostics of Convective Heat flux and Skin friction (UBACHs)
Abstract
It is traditionally assumed that the convective heat flux is directly proportional with the skinfriction, described by the Reynolds Analogy. However, in our recent investigation sponsored byONR through a series of Direct Numerical Simulations, we observed a sign ificant deviation fromthis theory under particular high frequency pulsations. The experimental characterization of thisunique effe ct via high-fidelity experiments requires Ultrawide BAndwidth simultaneous diagnosisof Convective Heat flux and Skin friction (UBAC Hs). The present proposal aims at expanding thedynamic range of our measurement capabilities by developing a unique three-element s ystemcomprising a high-speed Infrared camera with sub-microsecond exposure time to monitor theconvective heat flux, an array of hi gh-frequency optical transduction-based skin friction sensors,and HPC nodes on the Purdues newest supercomputer for post-processin g of the experimentalresults and uncertainty quantification coupled with high-fidelity numerical simulations. Thissystem will enha nce our world unique laser-based flow measurement techniques, includingFemtosecond laser electronic excitation tagging, high-speed stereo Particle Image Velocimetry, aswell as surface measurements such as frequency Pressure Sensitive Paint, thermo-phosphor, thi nfilm sensors and atomic thermopiles. The UBACHs system will directly serve the ONR-sponsoredModulated Enhancement of Heat Exchang ers program, which aims to develop a novel techniquebased on acoustic streaming to enhance the heat transfer with minimal skin fric tion increase.Additionally, it will benefit the Embedded Flow control for High Work / Low Reynolds turbinesproject, supported by A FOSR, geared towards implementing flow control strategies for highwork/low Reynolds turbines, the Enabling Technologies for High Sp eed Operable Systemsprogram, sponsored by AFOSR, on the high-fidelity experimental measurement of turbulent flowquantities, and th e AFRL-supported research on the spatially and temporally resolvedmeasurement of temperature and species concentration. Besides the se current DoD-sponsoredprojects, the UBACHs system facilitates several ongoing researches in our group to study rotatingdetonatio n combustors and design of ultrashort diffusers. It also initiates new research of highinterest to the DoD, specifically on the qua ntification of shock-boundary layer interactions,advancement of supersonic bladed and bladeless turbines for supersonic and hyperso nic aircraftsand heat flux measurement of turbine tip flow for small core turbines to improve cooling systems.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 20, 2021
- Source ID
- N000142112850
Entities
People
- Guillermo Paniagua
Organizations
- Office of Naval Research
- Purdue University
- United States Navy