Super-resolution of time-resolved three-dimensional density fields of the B mode in an underexpanded screeching jet

C Lee, Y Ozawa, T Nagata, T Nonomura - Physics of Fluids, 2023 - pubs.aip.org
The estimation of time-resolved three-dimensional (3D) density fields of an underexpanded
jet at the nozzle pressure ratio of 2.42, a so-called “spatiotemporal super-resolution” was …

Single-pixel particle image velocimetry for characterization of dielectric barrier discharge plasma actuators

T Nonomura, Y Ozawa, T Ibuki, K Nankai, A Komuro… - AIAA journal, 2020 - arc.aiaa.org
PLASMA-BASED actuators have been established as one of the most promising emerging
technologies for active flow control in aerodynamic applications. While a broad spectrum of …

Spatiotemporal superresolution measurement based on POD and sparse regression applied to a supersonic jet measured by PIV and near-field microphone

Y Ozawa, T Nagata, T Nonomura - Journal of Visualization, 2022 - Springer
The present study proposed the framework of the spatiotemporal superresolution
measurement based on the sparse regression with dimensionality reduction using the …

Schlieren image velocimetry of swirl sprays

DA Machado, F de Souza Costa… - Flow, Turbulence and …, 2023 - Springer
Schlieren image velocimetry (SIV) is based on light deflection through flow heterogeneities
and image cross-correlations. This is a low-cost and relatively low complexity technique that …

Spatial superresolution based on simultaneous dual PIV measurement with different magnification

Y Ozawa, H Honda, T Nonomura - Experiments in Fluids, 2024 - Springer
A reconstruction framework based on proper orthogonal decomposition and the Bayesian
estimation was designed for the spatial superresolution of a subsonic jet, and the …

Characterization of hydrogen jets considering leakage from high-pressure storage tanks using shadowgraphy

M Asahara, K Iwatsuki, D Kang, I Kambayashi… - International Journal of …, 2024 - Elsevier
The unsteady characteristics of pinhole-ejected ultrahigh-pressure hydrogen jets in the near
field are investigated by the PIV and FFT-IFFT analysis of time-series shadowgraph images …

Effect of the Reynolds number on the aeroacoustic fields of a transitional supersonic jet

Y Ozawa, T Nonomura, A Oyama, K Asai - Physics of Fluids, 2020 - pubs.aip.org
The Reynolds number effect on the aeroacoustic fields of a supersonic jet was
experimentally investigated via particle image velocimetry (PIV), schlieren visualization, and …

Experimental study on the smoke diffusion length affected by canyon winds in the open section of railway tunnel groups

X Chen, L Yu, J Huo, X Wang, S Wang, X Guo… - International Journal of …, 2024 - Elsevier
There are numerous tunnel groups, referring to multiple tunnels spaced a certain length
apart. When a fire occurred in a railway tunnel group, the train should brake out of tunnel …

Comparison of three-dimensional density distribution of numerical and experimental analysis for twin jets

C Lee, Y Ozawa, T Haga, T Nonomura, K Asai - Journal of Visualization, 2021 - Springer
Three-dimensional density fields of the twin jets were numerically and experimentally
investigated. The present study focused on the comparison of the density distribution for the …

Data assimilation of ideally expanded supersonic jet using rans simulation for high-resolution piv data

Y Ozawa, T Nonomura - Aerospace, 2024 - mdpi.com
Data assimilation using particle image velocimetry (PIV) and Reynolds-averaged Navier–
Stokes (RANS) simulation was performed for an ideally expanded supersonic jet flying at a …