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Record Details

Record 32 of 47516
Soot Formation in Laminar Acetylene/Air Diffusion Flames at Atmospheric Pressure. Appendix H
External Online Source: doi:10.1016/S0010-2180(01)00221-8
Author and Affiliation:
Xu, F.(Michigan Univ., Dept. of Aerospace Engineering, Ann Arbor, MI United States)
Faeth, G. M.(Michigan Univ., Dept. of Aerospace Engineering, Ann Arbor, MI United States)
Yuan, Z.-G. [Technical Monitor]
Urban, D. L. [Technical Monitor]
Yuan, Z.-G. [Technical Monitor]
Abstract: The flame structure and soot-formation (soot nucleation and growth) properties of axisymmetric laminar coflowing jet diffusion flames were studied experimentally. Test conditions involved acetylene-nitrogen jets burning in coflowing air at atmospheric pressure. Measurements were limited to the axes of the flames and included soot concentrations, soot temperatures, soot structure, major gas species concentrations, radical species (H, OH, and O) concentrations, and gas velocities. The results show that as distance increases along the axes of the flames, detectable soot formation begins when significant H concentrations are present, and ends when acetylene concentrations become small. Species potentially associated with soot oxidation-O2, CO2, H2O, O, and OH-are present throughout the soot-formation region so that soot formation and oxidation proceed at the same time. Strong rates of soot growth compared to soot nucleation early in the soot-formation process, combined with increased rates of soot nucleation and oxidation as soot formation proceeds, causes primary soot particle diameters to reach a maximum relatively early in the soot-formation process. Aggregation of primary soot particles proceeds, however, until the final stages of soot oxidation. Present measurements of soot growth (corrected for soot oxidation) in laminar diffusion flames were consistent with earlier measurements of soot growth in laminar premixed flames and exhibited encouraging agreement with existing hydrogen-abstraction/carbon-addition (HACA) soot growth mechanisms in the literature that were developed based on measurements within laminar premixed flames. Measured primary soot particle nucleation rates in the present laminar diffusion flames also were consistent with corresponding rates measured in laminar premixed flames and yielded a crude correlation in terms of acetylene and H concentrations and the temperature.
Publication Date: Jan 01, 2001
Document ID:
20030016584
(Acquired Mar 07, 2003)
Subject Category: INORGANIC, ORGANIC AND PHYSICAL CHEMISTRY
Document Type: Reprint
Publication Information: Combustion and Flame (ISSN 0010-2180); Volume 125; 804-819
Publisher Information: Elsevier Science, Inc., Unknown
Contract/Grant/Task Num: NAG3-1245; NAG3-1878; NAG3-2048
Financial Sponsor: NASA Glenn Research Center; Cleveland, OH United States
Organization Source: Michigan Univ.; Dept. of Aerospace Engineering; Ann Arbor, MI United States
Description: 17p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: SOOT; DIFFUSION FLAMES; ATMOSPHERIC PRESSURE; FLAME PROPAGATION; CHEMICAL REACTIONS; FLOW CHARACTERISTICS; MODELS; COMBUSTION PRODUCTS; GAS COMPOSITION; CHEMICAL COMPOSITION; ATOM CONCENTRATION; GAS ANALYSIS; TEMPERATURE MEASUREMENT; COMPUTERIZED SIMULATION; APPLICATIONS PROGRAMS (COMPUTERS)
Availability Source: Other Sources
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