@article{turpin_granlund_hayashi_sakaue_2021, title={Back-imaging of polymer-ceramic pressure-sensitive paint}, volume={32}, ISSN={["1361-6501"]}, url={https://doi.org/10.1088/1361-6501/ac0a0f}, DOI={10.1088/1361-6501/ac0a0f}, abstractNote={The feasibility of back-imaging polymer-ceramic pressure-sensitive paint (PC-PSP) was investigated, with supersonic flow over a rectangular cavity being the test subject. A PC-PSP formulation in which the luminophore was fully-integrated into the binding layer created a PSP which luminesced from the top and bottom of the layer. This PSP was applied to a clear acrylic plate serving as the cavity ceiling. Two identical high-speed cameras imaged the paint; one viewed the top of the PSP layer (front-imaging) whereas the other viewed the bottom of the layer (back-imaging). The temporal, time-averaged, and spectral response measured by each camera were functionally identical. Specifically, the two data were found to be 90% correlated in time at zero delay. The minor differences can be attributed to random noise and the fact that the cameras viewed through two different materials (one through acrylic and the other through optically-polished glass). These results illustrate that back-imaging is a promising method for overcoming the optical access constraints of conventional PSP imaging techniques.}, number={10}, journal={MEASUREMENT SCIENCE AND TECHNOLOGY}, publisher={IOP Publishing}, author={Turpin, Aaron M. and Granlund, Kenneth O. and Hayashi, Tatsunori and Sakaue, Hirotaka}, year={2021}, month={Oct} }
 @article{turpin_speth_sherer_granlund_2021, title={Low-frequency, spanwise oscillation in a finite-width cavity at Mach 1.5}, volume={33}, ISSN={["1089-7666"]}, url={https://doi.org/10.1063/5.0053682}, DOI={10.1063/5.0053682}, abstractNote={A joint experimental–computational program examined low-frequency, spanwise oscillations in supersonic flow over a finite-width cavity. Lowpass-filtered rear wall surface pressure revealed that shear layer impingement was most often biased to one side of the wall, switching sides at a frequency two orders of magnitude below resonance. Therefore, a bifurcation into two spanwise-asymmetric, mirrored, quasi-steady states could be defined. The states were described by biased impingement/ejection near the rear wall, asymmetry of the shear layer, and centrifugal inner-cavity flow. Resonance amplitudes were also found to be spatially modulated by the low-frequency flow switching. A yawed inflow was found to force one of the asymmetric states.}, number={7}, journal={PHYSICS OF FLUIDS}, author={Turpin, Aaron M. and Speth, Rachelle L. and Sherer, Scott E. and Granlund, Kenneth O.}, year={2021}, month={Jul} }
 @article{turpin_granlund_hayashi_sakaue_2021, title={Supersonic cavity flow with a downstream-sliding door}, volume={62}, ISSN={["1432-1114"]}, DOI={10.1007/s00348-021-03338-w}, number={12}, journal={EXPERIMENTS IN FLUIDS}, author={Turpin, Aaron M. and Granlund, Kenneth O. and Hayashi, Tatsunori and Sakaue, Hirotaka}, year={2021}, month={Dec} }
 @article{turpin_chin_granlund_2020, title={Supersonic Cavity Flow Subjected to Continuous and Transient Leading-Edge Blowing}, volume={58}, ISSN={["1533-385X"]}, DOI={10.2514/1.J059267}, abstractNote={A rectangular cavity (L/D=5.67) with Mach 1.5 freestream was subjected to a large temporal variation in leading-edge blowing in order to experimentally investigate the effect on aerodynamic and aer...}, number={10}, journal={AIAA JOURNAL}, author={Turpin, Aaron M. and Chin, Daniel and Granlund, Kenneth}, year={2020}, month={Oct}, pages={4415–4425} }
 @article{chin_turpin_granlund_2020, title={Time-Dependent Aerodynamic Loads on Single and Tandem Stores in a Supersonic Cavity}, volume={57}, ISSN={["1533-3868"]}, DOI={10.2514/1.C035749}, abstractNote={To understand time-dependent aerodynamic loads on single and tandem (fore/aft) slender cylinders translated out into the supersonic freestream from a cavity at Mach 1.5, the normal force and pitchi...}, number={4}, journal={JOURNAL OF AIRCRAFT}, author={Chin, Daniel and Turpin, Aaron and Granlund, Kenneth}, year={2020}, pages={702–714} }
 @article{demauro_wagner_dechant_beresh_turpin_2019, title={Improved scaling laws for the shock-induced dispersal of a dense particle curtain}, volume={876}, ISSN={["1469-7645"]}, DOI={10.1017/jfm.2019.550}, abstractNote={Experiments were performed within Sandia National Labs’ Multiphase Shock Tube to measure and quantify the shock-induced dispersal of a shock/dense particle curtain interaction. Following interaction with a planar travelling shock wave, schlieren imaging at 75 kHz was used to track the upstream and downstream edges of the curtain. Data were obtained for two particle diameter ranges ($d_{p}=106{-}125$, $300{-}355~\unicode[STIX]{x03BC}\text{m}$) across Mach numbers ranging from 1.24 to 2.02. Using these data, along with data compiled from the literature, the dispersion of a dense curtain was studied for multiple Mach numbers (1.2–2.6), particle sizes ($100{-}1000~\unicode[STIX]{x03BC}\text{m}$) and volume fractions (9–32 %). Data were non-dimensionalized according to two different scaling methods found within the literature, with time scales defined based on either particle propagation time or pressure ratio across a reflected shock. The data show that spreading of the particle curtain is a function of the volume fraction, with the effectiveness of each time scale based on the proximity of a given curtain’s volume fraction to the dilute mixture regime. It is seen that volume fraction corrections applied to a traditional particle propagation time scale result in the best collapse of the data between the two time scales tested here. In addition, a constant-thickness regime has been identified, which has not been noted within previous literature.}, journal={JOURNAL OF FLUID MECHANICS}, author={DeMauro, Edward P. and Wagner, Justin L. and DeChant, Lawrence J. and Beresh, Steven J. and Turpin, Aaron M.}, year={2019}, month={Oct}, pages={881–895} }