著者

新井 雅隆 天谷 賢児 長倉 邦仁

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.64, no.622, pp.1925-1931, 1998-06-25

被引用文献数

2

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Laser induced fluorescence method was applied for the measurement of NO concentration in the propane and methane diffusion flames. A tunable, narrow band ArF excimer laser was used to excite the D (υ′=0) ←X (υ″=1) band of NO molecule. Emission spectrum of the induced light by a laser beam was measured by a spectroscope. Spectrum of the induced light from the diffusion flame was compared with that of the premixed flame. Although the spectrum had only NO fluorescence components on premixed flame, a lot of strong spectrum components related to the laser induced incandescence of the soot and laser induced breakdown appeared in the spectrum from the diffusion flame. NO fluorescence component was picked out from the emission spectrum with traversing the irradiate position of laser beam in order to obtain the accurate distribution of NO fluorescence on the flame axis. In this paper this method was named as S-LIF method. A planer laser induced fluorescence (P-LIF) method was tried to measure the distribution of NO fluorescence on the flame axis. In the P-LIF method, an interference filter was used to remove the obstructive light component from the LIF image. NO fluorescence distribution measured by P-LIF method was compared with that of S-LIF method. As the result, the P-LIF image qualitatively agreed with the data of S-LIF. It was confirmed that the interference filter did not remove completely the obstructive light components.

著者

林 義裕 若林 千裕 古畑 朋彦 新井 雅隆

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 B編 (ISSN:03875016)

巻号頁・発行日

vol.72, no.716, pp.1021-1028, 2006-04-25 (Released:2011-03-03)

参考文献数

31

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Mixture formation of diesel spray impinged on an extruded surface, which was a top of cylindrical column, was investigated experimentally. A diesel spray was impinged vertically to the extruded surface. The behaviors of impinged spray were observed using a high-speed drum camera. A spray volume was estimated from the photographs. Effect of cylindrical column diameter on spray behavior was investigated. Adhering fuel was measured by a primitive “wiping by paper and mass measuring” method under various conditions. Air-fuel ratio in spray was calculated from spray volume and adhering fuel. As the result, the behavior of diesel spray impinged on an extruded column was strongly influenced by the diameter of the extruded column. From the measured results, it is clear that the air-fuel ratio in spray in the extruded column diameter of 45 mm was larger than those in the other columns.

著者

橋本 健 古畑 朋彦 新井 雅隆

出版者

日本機械学会

雑誌

日本機械学會論文集. B編 = Transactions of the Japan Society of Mechanical Engineers. B (ISSN:03875016)

巻号頁・発行日

vol.72, no.721, pp.2323-2329, 2006-09-25

参考文献数

8

被引用文献数

1

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Six-stroke diesel engine proposed here has six processes in one cycle, i.e. intaka, 1st compression, 1st combustion, 2nd compression, 2nd combustion and exhaust. By the effect of direct EGR in the 2nd combustion process, NO concentration could be expected to decrease. However, by a weak mixing in the 2nd combustion process, much soot was exhausted and NO concentration was hardly decreased compared with the conventional four-stroke diesel engine. To improve the fuel/air mixing at the 2nd combustion process, high pressure injection with common rail system was applied to the engine. As the result, NO concentration was increased owing to the increase of premixed combustion of 1st combustion process, although soot was reduced. Therefore, the 1st injection timing was extremely advanced to control the 1st combustion process. It changed 1st combustion process into HCCI-like combustion, and NO concentration was greatly decreased. Moreover, soot was reduced with no increase of NO concentration in the 2nd combustion process. As the result, trade-off curve of NO and soot was improved compared with the conventional four-stroke diesel engine. But CO concentration was increased.

著者

廣安 博之 新井 雅隆 田端 道彦

出版者

公益社団法人 日本マリンエンジニアリング学会

雑誌

日本舶用機関学会誌 (ISSN:03883051)

巻号頁・発行日

vol.20, no.3, pp.194-202, 1985-03-01 (Released:2010-05-31)

参考文献数

11

被引用文献数

6

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To study the effect of fuel viscosity, injection pressure and surface tension on the mean droplet size and spray angle, the diesel fuel spray droplets were measured by a Laser diffraction technique. Several kinds of glycerine solution with water and residual fuel oil were used. The tests were carried out over a wide range of injection pressure [3 to 90 MPa (30.6 to 917.7 kgf/cm2) ] and of kinematic viscosity of liquid [1×10-6 to 200×10-6 m2 /s (1 to 200 cSt) ] at ambient pressure of 3 MPa (30.6 kgf/cm2) .The main results obtained are as follows:(1) Sauter mean diameter increases with increasing kinematic viscosity of liquid, but decreases with increasing injection pressure. There are an upper limit of viscosity and a lower limit of the pressure to produce a fine spray.(2) At high injection pressure, the effect of viscosity on Sauter mean diameter still remains, but the viscosity has no effect on the spray angle.(3) When the viscosity is the same at low injection pressure, Sauter mean diameter of glycerine solution spray is larger than that of residual oil. Surface tension has no effect on the Sauter mean diameter at high injection pressure.

著者

新井 雅隆 天谷 賢児 長瀧 翼 沖田 秀樹

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.71, no.702, pp.737-743, 2005-02-25

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Ignition and combustion characteristics of diesel spray impinging on an inclined wall were experimentally investigated. Ignition position and appearance position of the luminous flame kernel were stereoscopically observed using a two-way fiber optical system. Flat impingement wall was fixed in a high temperature, high pressure combustion chamber. Inclined angle of the flat wall was set at 30 degees or right angle against the center axis of the injection spray. Distance from nozzle tip to the impingement point on the wall was set at 50mm. Effect of ambient temperature on ignition position was investigated. As the result, ignition positions were observed near the spray periphery in the both cases of 30 degrees and right angle impingements. However, the luminous flame appeared near the wall surface at downword side of inclined wall because the fuel rich region was formed around the downword side of spray impingement point.

著者

川口 知宏 長瀧 翼 天谷 賢児 古畑 朋彦 新井 雅隆

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.72, no.717, pp.1378-1383, 2006-05-25

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Ignition and combustion characteristics of diesel spray impinging on a wall were experimentally investigated. Ignition position and appearance position of the luminous flame kernel were stereoscopically observed using a two-way fiber optical system. Flat

著者

川口 知宏 長瀧 翼 古畑 朋彦 新井 雅隆

出版者

一般社団法人日本機械学会

雑誌

日本機械学会関東支部ブロック合同講演会講演論文集

巻号頁・発行日

vol.2005, pp.35-36, 2005-08-25

著者

新井 雅隆 樋口 豪 廣安 博之

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.50, no.453, pp.1345-1352, 1984-05-24

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軽油および複合燃料によるディーゼル噴霧の着火おくれを定容燃焼器を用いて測定した。この際、着火おくれは発火おくれとし、これをフォト・トランジスタにより検出した。測定結果をアレニウス表示したところ、高温側と低温側に分かれた2本の直線になることがわかった。またエタノール混合軽油で約50%以下、水-軽油エマルジョンで約40%以下の混合割合であれば、着火おくれは軽油の場合と大差のないことがわかった。

著者

新井 雅隆 斉藤 正浩

出版者

群馬大学

雑誌

基盤研究(C)

巻号頁・発行日

2002

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ディーゼル機関から排出される粒子状物質(すす)を除去するために,すすの捕集と燃焼を繰り返すことで連続処理を可能とした電界式すす除去装置(E-DPF)を新たに開発した.この装置の特徴として,E-DPF内に電極を兼ねたステンレス製の多孔板が層状に配置されており,交流電界(0〜260V)あるいは直流電界(0〜350V)を電極間に印加した.E-DPF装置の基本的性能を調べるために,ディーゼル排ガスの模擬ガスとしてアセチレン火炎から発生するすすを用いて実験を行った.その結果,すすは電極を兼ねた多孔板を通過する際に,電界の作用により帯電し,分極したすす粒子が多孔板に付着して電界方向に粒子のブリッジを形成することがわかった.そのブリッジ状すすの捕集量と電極間の電流には相関があり,印加電圧が低い領域では比例関係となるが,印加電圧を高めてブリッジ状すすが再燃焼する領域では,多孔板間のブリッジが局所的に切断されて電流値の増大が抑えられる.ブリッジ状すすの生長速度は電界強度が比較的低い約50kV/mで最大となるが,すすが再燃焼するには至らなかった.また,電界強度が100kV/m以上になるとブリッジ状すすが火花放電あるいは直接通電によるジュール熱ですすの再燃焼が生じ,本実験範囲では150kV/m付近において,すすの再燃焼効率が約30%で最も高くなることがわかった.さらに,電界強度が200kV/m以上では,ブリッジ状のすすの成長が強度の火花放電によって抑制され,これがすすの捕集効率を下げることにつながり,結果として再燃焼効率は低下した.

著者

佐藤 桂司 林田 和宏 天谷 賢児 新井 雅隆

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.70, no.692, pp.1051-1057, 2004-04-25

被引用文献数

12

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In this paper, separation of laser-induced fluorescence (LIF) due to PAHs and incandescence (LII) due to soot by time-resolved measurement was demonstrated for the propane diffusion flame. Laser-induced fluorescence method for the measurement of polycyclic aromatic hydrocarbons (PAHs) in diffusion flame was developed. A KrF excimer laser was used for excite the PAHs. Strong laser-induced incandescence due to soot was appeared with fluorescence signal due to PAHs. In order to separate the signals into LII and the PAHs-LIF detected from diffusion flame, time-resolved measurement was carried out. A pico-second gate CCD camera with a image intensifier was used taking a time-resolved image. From the two different images, which were taken at different time-delay, PAHs-LIF and LII were obtained. Intensity distributions of PAHs-LIF and LII were measured on the flame axis. Overlap region of the LIF and LII was observed around the onset position of the yellow flame. In this region, LIF intensity decreased and LII intensity increased along the flow direction. It seemed that this region was transition region from the PAHs to soot and was attributed the presence of soot precursor.