Experimental and computational characterization of transonic turbine relevant flow fields
Pennsylvania State University
Abstract
Simultaneous pressure and velocity measurements of compressible flows are essential for understanding fundamental flow phenomena such as shockwave–boundary layer interactions, influence of surface cooling/film cooling, or supersonic jet noise. To date, there are few measurement techniques that can obtain both quantities in the flow simultaneously. Of particular interest is development of non-intrusive, spatially resolved techniques since probes can interfere with the flow, and spatial resolution of complex flow interactions is important to identify sources of noise. Recent developments in particle image velocimetry have shown that by measuring the velocity field and its gradients, the pressure field can be inferred with adequate boundary information and assumptions about the flow (namely, either that it is incompressible, or is adiabatic if compressible).
This presentation will focus on establishing a robust algorithm to determine pressure from velocimetry measurements for adiabatic flows, and developing a framework to acquire temperature from thermographic velocimetry measurements for nonadiabatic flows. An algorithm to extract three-dimensional pressure from tomographic particle image velocimetry data for compressible nonadiabatic flows has been completed and demonstrated. Additionally, experimental measurements of the wake behind large-scale and true-scale airfoils have been measured, showing that pressure information can be experimentally obtained from particle image velocimetry data. Large Eddy Simulation (LES) has also been utilized to capture Reynolds- and Favre-averaged quantities to evaluate their impact on the pressure reconstruction algorithm.
About the speaker
Mr. Matthew Krull is a Ph.D student in Mechanical Engineering and a NASA Advanced Air Vehicles Program (AAVP) graduate fellow at Penn State University. He works in the Experimental and Computational Convection Laboratory (ExCCL) studying turbine aerodynamics and heat transfer. He received his M.S. in Mechanical Engineering at Penn State University, and his B.S. in Mechanical Engineering and a minor in Physics at Penn State Behrend.
