SPHERICAL GAS-FUELED COOL DIFFUSION FLAMES

Simple item page
dc.contributor.advisorSunderland, Peter B.en_US
dc.contributor.authorKim, Minhyengen_US
dc.contributor.departmentFire Protection Engineeringen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2023-02-01T06:31:18Z
dc.date.available2023-02-01T06:31:18Z
dc.date.issued2022en_US
dc.description.abstractAn improved understanding of cool diffusion flames could lead to improved engines. These flames are investigated here using a spherical porous burner with gaseous fuels in the microgravity environment of the International Space Station. Normal and inverse flames burning ethane, propane, and n-butane were explored with various fuel and oxygen concentrations, pressures, and flow rates. The diagnostics included an intensified video camera, radiometers, thin-filament pyrometry, and thermocouples. Spherical cool diffusion flames, transitioned from hot flames, burning gases were observed for the first time. However, these cool flames were not readily produced and were only obtained for normal n-butane flames at 2 bar with an ambient oxygen mole fraction of 0.39. The sizes of hot and cool diffusion flames were investigated with the intensified camera images. The hot flames that spawned the cool flames were 2.6 times as large. An analytical model is presented that combines previous models for steady droplet burning and the partial-burning regime for cool diffusion flames. The results identify the importance of burner temperature on the behavior of these cool flames. They also indicate that the observed cool flames reside in rich regions near a mixture fraction of 0.53.en_US
dc.identifierhttps://doi.org/10.13016/n8ln-uehb
dc.identifier.urihttp://hdl.handle.net/1903/29540
dc.language.isoenen_US
dc.subject.pqcontrolledMechanical engineeringen_US
dc.subject.pqcontrolledChemical engineeringen_US
dc.subject.pquncontrolledCool flameen_US
dc.subject.pquncontrolledFormaldehydeen_US
dc.subject.pquncontrolledIntensified video cameraen_US
dc.subject.pquncontrolledMicrogravity combustionen_US
dc.subject.pquncontrolledPorous burneren_US
dc.titleSPHERICAL GAS-FUELED COOL DIFFUSION FLAMESen_US
dc.typeThesisen_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Kim_umd_0117N_22704.pdf
Size:
18.13 MB
Format:
Adobe Portable Document Format
Download

Collections

UMD Theses and Dissertations
Fire Protection Engineering Theses and Dissertations