Post-Processor for a combustion shock tube
-All files are .csv files -All files are named in the same way: date(yyyymmdd) _ run#(00#) _ file type. -Date ex: 20230929 is September 29, 2023) -Run# ex: run one is _001, run ten is _010)
The same 4 file types are output for every experiment: yyyymmdd_run_Experiment Parameters yyyymmdd_run_DarkFullData yyyymmdd_run_TimerData yyyymmdd_run_ShockData
The content of these file types is:
yyyymmdd_run_Experiment Parameters: 1KB, Describes tube initial conditions. 5 rows, two columns Ex contents: Vacuum Pressure (torr), 3.80E-06 Test Gas Pressure (torr), 3.315 Region 1 Pressure (torr), 3.315 Region 1 Temperature (degC), 25.6 Region 4 Pressure (psi), 7.2
yyyymmdd_run_DarkFullData ~8,100KB, Full Oscilloscope record for static tube under vacuum. It's used for offset-correction, so all nearly all data streams look like noise around a near-zero signal -100,002 rows, 9 columns. Row 1 is Headers, Row 2 is an offset, next 100,000 rows are data
- Column 1 is time (ms), Columns 2-9 are Oscope channels 0-7 Headers: Time (ms) Kistler Pressure OH Side HeNe Pitch HeNe Catch OH End PCB 5 CO2 Pitch CO2 Catch
yyyymmdd_run_TimerData 1KB, Counter-Timer data used to determine shock velocity. 5 rows, 4 columns (but rows are likely to be added if additional counter-timers are added) Ex contents: Channel Name Start Source End Source Measured Time (s) Counter 0 PCB 1 PCB 2 2.683700E-4 Counter 1 PCB 2 PCB 3 2.668700E-4 Counter 2 PCB 3 PCB 4 2.674800E-4 Counter 3 PCB 4 PCB 5 2.708100E-4
yyyymmdd_run_ShockData ~8,100KB, Full Oscilloscope record for experiment. This is the primary experimental data, and all the interesting O-scope traces are found here. Identical structure to yyyymmdd_run_DarkFullData
I've included a few days of experiment files as example data. This is not an exhaustive list and does not necessarily represent every type of experiment that could be experienced. However, it is a good start to understanding the format of the Oscope traces.
yyyymmdd_run# - Trigger - Ignition - Notes Features to identify from "Kistler Pressure" trace:
20230920_001 - 1ms - Fast - dpdt does not have peaks near incident or reflected shock, 1)incident shock, 2)Reflected shock 3)shock bifurcation 4)ignition
20230920_001 - 1ms - Medium - dpdt has weak peaks near incident and reflected shocks, 1)incident shock, 2)Reflected shock 3)shock bifurcation 4)ignition
20230929_001 - 2ms - very Fast - really weak incident shock, non-obvious shock bifurcation, 1)incident shock, 2)Reflected shock 3)shock bifurcation 4)ignition
20230929_005 - 2ms - None - weak incident shock, no shock bifurcation, 1)incident shock, 2)Reflected shock
20231116_006 - 2ms - None - but reflected shock is offset, no shock bifurcation, 1)incident shock, 2)Reflected shock