High speed video image and pressure data of counter rotating detonation waves

Luminosity and Pressure Data of the RDC 1. Overview This repository contains raw and processed luminosity (HSV) and pressure data generated by M.D. Bohon et al. during RDC experiments. The luminosity data and pressure data describes different operating modes such as 2CR: two counter rotating waves traveling at same speed (ID: BD0041) 2CRT: two counter rotating waves traveling at different speed, where the faster one is larger in amplitude (ID: BD0038) DS2: one dominant wave and a set of two counter rotating traveling waves. (ID:CE2029) 2. Repository Structure data/ ├── data_input/ # unprocessed luminosity and pressure data │ ├── 00_hsv/ # luminosity (HSV) files │ └── 01_pressure/ # pressure files ├── data_output/ # processed data (luminosity and pressure) │ ├── 00_hsv/ # processed HSV data │ └── 01_pressure/ # processed pressure data ├── get_fft_amp.m # MATLAB script for FFT amplitude analysis ├── handle_data_hsv_input.m # MATLAB script for HSV preprocessing ├── handle_data_pressure_input.m # MATLAB script for pressure preprocessing └── README.md # documentation 3. Directory Details data_input/00_hsv Contains raw high-speed video (HSV) luminosity data in .mat format. Filenames follow the convention: <ID>_HSV_CB076_<A####>_Phi<####>_<YYYYMMDD>_<START>_<END>.mat where: <ID>: experiment identifier (e.g., BD0027, BJ0021). <A####>: Surface Area of the injection holes (unsure). Phi<####>: equivalence ratio. <YYYYMMDD>: date of experiment. <START>_<END>: defines a certain range within in the whole recording (unsure) Helper scripts: get_varname_hsv.m — extracts which of the variables in the workspace should be saved. load_data_hsv_input.m — loads raw HSV data according to the passed identifier (e.g. BJ0021). data_input/01_pressure Contains raw pressure measurements in .mat format. Filenames follow the convention: <ID>_CB076_<A####>_Phi<####>_<YYYYMMDD>.mat where <ID>, <A####>, Phi<####>, and <YYYYMMDD> follow the same conventions as HSV data. Includes helper scripts: get_varname_pressure.m — extracts which of the pressure variables in the work space should be saved . load_data_pressure_input.m — loads raw pressure data according to the passed identifier (e.g. BJ0021). data_output/00_hsv Contains processed HSV luminosity data in .mat format. Processed files are named by experiment ID only (e.g., BD0027.mat). Generated using handle_data_hsv_input.m. Processing includes a data pipeline: (i) luminosity threshold based mask (ii) coordinate transformation: Cartesian -> polar (iii) centering of the data (iv) radial averaging data_output/01_pressure Contains processed pressure data in .mat format. Processed files are named by experiment ID only (e.g., BD0027.mat). Generated using handle_data_pressure_input.m. Processing includes: load position of pressure probes in the RDC according to identifier (different amount of PCB probes used in the test runs) Computation of the FFTs of the pressure times series. MATLAB Scripts handle_data_hsv_input.m — processes high dimensional (329x239x5000) luminosity snapshots into low dimensional luminosity (800x5000) snapshots and the required meta data (masks etc.) into .mat outputs. handle_data_pressure_input.m — extracts PCB positions and computes the FFTs accordingly into .mat outputs. get_fft_amp.m — computes FFT amplitude spectrum. 4. Usage Instructions If it is required to reproduce the data, proceed as follows: Run the preprocessing scripts in MATLAB: handle_data_hsv_input handle_data_pressure_input Processed data will be generated in the corresponding data_output/ subdirectories. 5. Supplementary Material Details on the data acquisition and how the RDC functions can be found in (Bach et al. 2020; Bluemner et al. 2019; Barnouin et al. 2024; Bohon et al. 2021, 2019). References Bach, Eric, Christian O. Paschereit, Panagiotis Stathopoulos, and Myles Bohon. 2020. "RDC Operation and Performance with Varying Air Injector Pressure Loss." AIAA Scitech 2020 Forum (Orlando, FL), January. https://doi.org/10.2514/6.2020-0199. Barnouin, Provence, Christian O. Paschereit, Eric Bach, and Myles D. Bohon. 2024. Dynamics and Interactions of Counter-Rotating Waves in Rotating Detonation Combustors. SSRN. https://doi.org/10.2139/ssrn.5051709. Bluemner, R., M. D. Bohon, C. O. Paschereit, and E. J. Gutmark. 2019. "Counter-Rotating Wave Mode Transition Dynamics in an RDC." International Journal of Hydrogen Energy 44 (14): 7628--41. https://doi.org/10.1016/j.ijhydene.2019.01.262. Bohon, M. D., R. Bluemner, C. O. Paschereit, and E. J. Gutmark. 2019. "High-Speed Imaging of Wave Modes in an RDC." Experimental Thermal and Fluid Science 102 (April): 28--37. https://doi.org/10.1016/j.expthermflusci.2018.10.031. Bohon, M. D., A. Orchini, R. Bluemner, C. O. Paschereit, and E. J. Gutmark. 2021. "Dynamic Mode Decomposition Analysis of Rotating Detonation Waves." Shock Waves 31 (7): 637--49. https://doi.org/10.1007/s00193-020-00975-8.