دورية أكاديمية
Extinction Studies of Propane/Air Counterflow Diffusion Flames: The Effectiveness of Aerosols
| العنوان: | Extinction Studies of Propane/Air Counterflow Diffusion Flames: The Effectiveness of Aerosols |
|---|---|
| المؤلفون: | Fleming, James W., Reed, Mark D., Zegers, Eric J., Williams, Bradley A., Sheinson, Ronald S. |
| المساهمون: | NAVAL RESEARCH LAB WASHINGTON DC |
| المصدر: | DTIC AND NTIS |
| سنة النشر: | 1998 |
| المجموعة: | Defense Technical Information Center: DTIC Technical Reports database |
| مصطلحات موضوعية: | Organic Chemistry, Polymer Chemistry, Combustion and Ignition, EXTINCTION, AIR FLOW, DIFFUSION, FLAMES, FIRE SUPPRESSION, FLUORINATED HYDROCARBONS, PROPANE, LIGHT SCATTERING, PARTICLE SIZE, VIBRATION, AEROSOLS, LASER BEAMS, STRAIN RATE, REPLACEMENT, FIREPOWER, SIMPLIFICATION, SUPPRESSION, AMPLIFIERS, BURNERS, TUBES, POTASSIUM COMPOUNDS, ORIFICES, BICARBONATES, SODIUM COMPOUNDS, HALONS, DIFFUSION BURNER, SERDP COLLECTION |
| الوصف: | The fire suppression effectiveness of solid aerosols as suitable halon replacements has examined. Experiments were performed in a counterflow diffusion burner, consisting of two 1 cm i.d. tubes separated by 1 cm. Aerosols were delivered to propane/air flames in the air flow. Both sodium bicarbonate (NaHCO3) and potassium bicarbonate (KHCO3) powders were examined. The NaHCo3 and KHCO3 powders were separated into various size groupings (<38 , 38-45 , 45-53 , 53-63 , and 63-75 ) using a commercial sieving system. The agent delivery system incorporated a variable orifice for gross adjustment of the delivery rate, and a variable frequency vibration unit for fine adjustments and to maintain powder flow. Light scattering using a modulated HeNe laser beam and a lock-in amplifier was used to monitor the amount of powder exiting the air tube and entering the flame. Extinction concentrations were determined for each agent sample as a function of the strain rate of the uninhibited flame. In general, suppression effectiveness increased with decreasing particle size or increasing strain rate for the size range studied. Potassium powders were 2.5 times by weight more effective than sodium powders. The suppression effectiveness of these powders as a function of particle size can be interpreted using a simplified model of the behavior of particle in counterflow steams. |
| نوع الوثيقة: | text |
| وصف الملف: | text/html |
| اللغة: | English |
| العلاقة: | http://www.dtic.mil/docs/citations/ADA379908Test |
| الإتاحة: | http://www.dtic.mil/docs/citations/ADA379908Test http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA379908Test |
| حقوق: | APPROVED FOR PUBLIC RELEASE |
| رقم الانضمام: | edsbas.A01BE1DA |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |