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林田, 和宏 ; 土師, 勝彦 ; 天谷, 賢児 ; 新井, 雅隆
概要:
application/pdf<br />Journal Article<br />In this study, effect of fuel properties on diffusion combustion of kerosene was investigated experimentally. Five types of kerosene, which distillation and composition properties were
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different, were used as the test fuel. Laminar diffusion flames of kerosene were formed by using wick combustion burner. Fuel consumption rate, flame temperature and flame luminosity of each flame were measured. As the results, fuel consumption rate proportionally increased with decreasing volume average boiling point, and both temperature and luminosity decreased as the aromatic content in the fuel increase. To investigate the effect on soot formation of fuel properties, concentration distributions of polycyclic aromatic hydrocarbons (PAHs) and soot were measured by laser-induced fluorescence (LIF) and laser-induced incandescence (LII). Both PAHs-LIF intensity on wick and LII intensity of soot emission increased with the content of aromatic compounds in the fuel became higher.
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| 2.
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山本, 知恵美 ; 内野, 寿一 ; 古畑, 朋彦 ; 新井, 雅隆
概要:
application/pdf<br />Journal Article<br />Nanometer size particulate matter (Nano-PM) emitted from diesel engine has been received many anxieties due to its harmful potential for health. The objective of this study is to develop a
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standard Nano-PM generator using liquid fuels, and to investigate the relationship between the characteristics of PM and operation parameters of the generator. A fundamental pool flame of diesel fuel was used for generation of Nano-PM. Scanning Mobility Particle Sizer (SMPS3034) was used to measure the size distribution of PM, and the components of PM were analyzed using a combustion type exhaust gas analyzer (MEXA-1370PM). Thermal diluter was used to investigate the heating effect on size distribution of PM. Main parameters of the PM generator were height and pattern of diffusion flame. Two types of diffusion flame were formed on a fuel pool. One is a small flame where the flame tip was closed and no visible soot was observed. The other was an open tip flame that emitted visible soot from its tip. As for the size distribution of PM, peak diameter increased gradually with an increase of fuel consumption rate. Main component of Nano-PM exhausted from a closed flame was SOF, however dry soot was the main component of open flame. Under hot thermal dilution, number of large particles decreased but number of small particles increased.
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| 3.
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佐藤, 博之 ; 天谷, 賢児 ; 新井, 雅隆
概要:
application/pdf<br />Journal Article<br />Quantitative investigation of the gravity effect was performed for acetone and kerosene pool fires. A centrifuge was used to examine the gravity effect. Small-scale pool fires were observed
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under various high gravity fields. Regions of stable flame, puffing flame and irregular oscillatory flame were mapped with the gravity level and pool diameter. Flame height decreased and oscillatory frequency increased with an increase in the gravity level. Behavior of the flame height was agreed quantitatively with the scaling prediction presented by Orloff and Heskestad. Puffing phenomena observed under various gravity fields were summarized with the Strouhal number and Froude number. As the result, we could obtain an empirical equation of St=0.517Fr^<-0.502>. From this equation, puffing frequency could be estimated for a flame of various pool diameter varying from 0.01 to 50 meters.
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茂木, 俊夫 ; 新井, 雅隆
概要:
application/pdf<br />Journal Article<br />Fundamental characteristics of the catalytic combustion of vaporized kerosene
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spray were studied experimentally. Palladium catalyst supported on the cordierite honeycomb monolith was used. Inlet temperature was elevated up to 700 K to evaporate the kerosene spray. Premixed gas of air and kerosene vapor was introduced into the catalyst. The catalytic combustion and gas phase reaction after catalyst were observed in this combustion system. The lean limit of the catalytic combustion was not affected by the space velocity and equivalence ratio of the mixture, but it was greatly affected by the inlet temperature. The parabolic shape blue flame that was supported on the catalyst was formed when the supplied mixture was not completely burned in the monolith. To clarify a reaction process in an combustive gas between the monolith and the blue flame, CO, HC(C_1～C_7) and NO were analyzed. When the blue flame was observed after the catalyst, the HC and CO were formed from the unburned composition of fuel and they were burned as the blue flame. The NO emission level of the catalytic combustion was very low compared with the gas phase reaction of lean mixture.
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OKAI, Keiichi ; ONO, Yutaka ; MORIUE, Osamu ; SHIBA, Seiji ; ARAKI, Mikiya ; NOMURA, Hiroshi ; SHIGA, Seiichi ; TSUE, Mitsuhiro ; KONO, Michikata
概要:
application/pdf<br />Journal Article<br />Experimental investigation was conducted on two droplet-array combustion of methanol and methanol/dodecanol mixture fuels in microgravity. For methanol, effects of ambient pressure and
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droplet spacing were examined. Results show that the droplet lifetime decreases with increasing spacing at relatively low pressure and the droplet lifetime becomes independent of spacing at higher-subcritical and supercritical pressures. For methanol/dodecanol mixture, effects of pressure, fuel composition were investigated in terms of occurrence of disruption. Disruption of droplet during combustion was demonstrated both for single droplet and droplet pairs.
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| 6.
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岡井, 敬一 ; 小野, 豊 ; 森上, 修 ; 芝, 世弐 ; 荒木, 幹也 ; 野村, 浩司 ; 志賀, 聖一 ; 津江, 光洋 ; 河野, 通方
概要:
application/pdf<br />Journal Article<br />Experimental investigation was conducted on two droplet-array combustion of methanol and methanol/dodecanol mixture fuels in microgravity. For methanol, effects of ambient pressure and
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droplet spacing were examined. Results show that the droplet lifetime decreases with increasing spacing at relatively low pressure and the droplet lifetime becomes independent of spacing at higher-subcritical and supercritical pressures. For methanol/dodecanol mixture, effects of pressure, fuel composition were investigated in terms of occurence of disruption. Disruption of droplet during combustion was demonstrated both for single droplet and droplet pairs.
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