PSI-142 ·

Overview

Objective [text]

By using the Flame Extinguishment (FLEX) experimental data from the Physical Sciences Informatics (PSI) system of combustion science, the purpose of this grant was to conduct new simulations and ground-based experiments using ozone-sensitized counterflow flames to: 1) Develop a new diagram of the flammability limits of diffusional cool flames affected by radiation, diffusion, and convection. 2) Bridge the knowledge gap between the flammability limits and extinction limits of hot flames and cool flames. 3) Verify the phenomena observed on the ISS flame extinguishment experiments. 4) Obtain new, quantitative data of extinction limit, flame temperature, and species distribution for the validation of kinetic and radiation models involving cool flames. 5) Extend the cool flame experiments from the original ISS droplet experiments to a more general ground-based combustion system involving radiation, diffusion, convection, and low-temperature chemistry while maintaining a one-dimensional geometry.

Source

data/raw/psi-data/PSI-142/_investigation/PSI-142.json: objective · PSI investigation

Approach [text]

Using the experimental conditions of FLEX flight, a comparative studies of the oxygen concentration effects on the extinction limits of cool flames was conducted using three different numerical modeling schemes, (a) spark-assisted flame propagation of a n-heptane/air mixture, (b) one dimensional freely-propagating dimethyl ether (DME) flames using an arc-length continuation method and (c) simulated cool flame regimes and burning limits at elevated pressure (up to 20 atm) using DME/air mixtures. Specific research details are outlined in the publication, ''Dynamics of cool flames'' [https://doi.org/10.1016/j.pecs.2019.100787]; '' Understanding Cool Flames and Warm Flames'', [https://doi.org/10.1016/j.proci.2020.09.019] and ''Study of the low-temperature reactivity of large n-alkanes through cool diffusion flame extinction'', [https://doi.org/10.1016/j.combustflame.2017.01.028].

Source

data/raw/psi-data/PSI-142/_investigation/PSI-142.json: approach · PSI investigation

Hypothesis [text]

This investigation attempts to answer the critical question as to what conditions causes the hot flames transfer to cool flames and how the cool flame flammable region is related to hot flame flammability limit and extinction limit. The investigation hypothesizes that factors such as oxygen concentration, dilution, pressure, diffusion, and convection transport processes affect the cool flame transition.

Source

data/raw/psi-data/PSI-142/_investigation/PSI-142.json: hypothesis · PSI investigation

Research impacts [text]

Obtaining a fundamental understanding of the warm diffusion flame is particularly relevant to combustion in highly turbulent flow fields and in microgravity environments, owing to the possibility of long residence times. The results showed that the warm flame has a double reaction zone structure and plays a critical role in the transition between cool flames and hot flames. At elevated pressures, it was found that the flammable region of warm flames and cool flames expands due to the increase in low-temperature and intermediate-temperature reactivity with pressure. Since many real engines operate in the 20-40 atm pressure range, therefore, cool flames and warm flames are relevant and important flame regimes for high-pressure near-limit combustion applications. These calculations from this investigation will serve to advance the understanding of near-limit flame dynamics and provide guidance for experimental observation of different flame regimes.

Source

data/raw/psi-data/PSI-142/_investigation/PSI-142.json: researchImpacts · PSI investigation

Hardware [text]

Principal Investigator Laboratory Hardware

Source

data/raw/psi-data/PSI-142/_investigation/PSI-142.json: experimentHardware · PSI investigation

Flight program [text]

Not Applicable

Source

data/raw/psi-data/PSI-142/_investigation/PSI-142.json: flightProgram · PSI investigation

Start date [text]

08-01-2016

Source

data/raw/psi-data/PSI-142/_investigation/PSI-142.json: investigationStartDate · PSI investigation

End date [text]

07-31-2021

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data/raw/psi-data/PSI-142/_investigation/PSI-142.json: investigationEndDate · PSI investigation

Tests

0 tests with extracted table records (SAME-R aging sub-runs grouped by parent ID) · 0 extracted values (source: data/conditions/PSI-142.csv).

Variation is observed in extracted values; it does not establish the experimental design.

Variable	Observed	Distinct values / tests	Range

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Additional outcome cells, where available, are displayed as written. Source: data/derived/outcomes_extra.csv.

Instruments mentioned in the approach

No instrument sentence identified in the approach text.

Experimental table columns

Data ID [table] data/raw/psi-data/PSI-142/Experimental table/PSI-142_Experimental table_Data Summary Table.csv · PSI investigation
Data Description [table] data/raw/psi-data/PSI-142/Experimental table/PSI-142_Experimental table_Data Summary Table.csv · PSI investigation
Reference Publication Link [table] data/raw/psi-data/PSI-142/Experimental table/PSI-142_Experimental table_Data Summary Table.csv · PSI investigation
Figure ID in Reference [table] data/raw/psi-data/PSI-142/Experimental table/PSI-142_Experimental table_Data Summary Table.csv · PSI investigation

Data

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Publications

Dynamics of cool flames 10.1016/j.pecs.2019.100787 [data/manifest/publications.csv]
The radical index and the effect of oxygen concentration on non-premixed cool flame extinction of large n-alkanes 10.1016/j.combustflame.2021.111471 [data/manifest/publications.csv]
On the propagation limits and speeds of premixed cool flames at elevated pressures 10.1016/j.combustflame.2017.01.006 [data/manifest/publications.csv]
Study of the low-temperature reactivity of large n-alkanes through cool diffusion flame extinction 10.1016/j.combustflame.2017.01.028 [data/manifest/publications.csv]
Counterflow flame experiments and chemical kinetic modeling of dimethyl ether/methane mixtures 10.1016/j.combustflame.2018.06.004 [data/manifest/publications.csv]
Low-temperature multistage warm diffusion flames 10.1016/j.combustflame.2018.03.013 [data/manifest/publications.csv]
Dynamics and burning limits of near-limit hot, warm, and cool diffusion flames of dimethyl ether at elevated pressures 10.1016/j.proci.2018.05.082 [data/manifest/publications.csv]
On the chemical characteristics and dynamics of n-alkane low-temperature multistage diffusion flames 10.1016/j.proci.2018.06.161 [data/manifest/publications.csv]
Quantitative measurements of HO 2 /H 2 O 2 and intermediate species in low and intermediate temperature oxidation of dimethyl ether 10.1016/j.proci.2014.05.120 [data/manifest/publications.csv]
SUPPLEMENTARY MATERIAL The radical index and the effect of oxygen concentration on non-premixed cool flame extinction of large n-alkanes [data/manifest/publications.csv]
Pressure and Radiation Effects on the Dynamics of Hot and Cool Diffusion Flames [data/manifest/publications.csv]
Transient interactions between a premixed double flame and a vortex 10.1016/j.proci.2018.07.050 [data/manifest/publications.csv]

Data reuse

PSI-69 [text] data/raw/psi-data/PSI-142/_investigation/PSI-142.json: related_glds · PSI investigation

Other PSI records that list this investigation

PSI-117 [text] data/raw/psi-data/PSI-117/_investigation/PSI-117.json: related_glds

These are links recorded in PSI; their presence alone does not describe the reuse relationship.

PSI page

PSI page data/manifest/web_check_2026-11-14.csv: line 1 URL pattern

In PYRION

Explore tests · · PSI DOI: 10.60555/80qf-vj95