Characterization of Mixture Formation Process of Fuel Jet Injected into Superctirical Environment

超临界环境中燃料射流混合形成过程的表征

• 批准号: 15560182
• 负责人: NISHIDA Keiya
• 金额: $ 2.43万
• 依托单位: HIROSHIMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560182/
• 关键词: Fuel Spray; Mixture Formation; Concentration Distribution; Supercritical Environment; Laser Diagnostics; Image Processing; Combustion

An experimental study was conducted on the mixture formation characteristics of the fuel jet injected into the supercritical environment (temperature and pressure of the ambient gas were both higher than the critical point of the fuel) in a constant volume vessel. The 2-wavelength laser absorption scattering (LAS) technique was adopted to quantitatively measure the spray and mixture properties.In this study, the fuel jet in a Diesel engine or a D.I. gasoline engine, whose combustion chamber environment is supercritical for the fuel, was investigated. Effects of nozzle hole diameter, hole L/D and injection pressure were examined. A comparison was made between a single-pulse injection and a two-pulse split injection. The main results are summarized as follows.As the nozzle hole diameter is decreased, the fuel evaporation is enhanced due to the decrease in the Sauter mean diameter, the amount of air entrained into the fuel jet is decreased, and consequently the equivalence ratio of the vapor phase becomes a little higher. As the injection pressure is increased, the fuel evaporation is enhanced due to the decrease in the Sauter mean diameter, the amount of air entrained is increased, and as a balance of these changes, the equivalence ratio of the vapor phase becomes a little lower. Comparing with the single-pulse injection, the split injection before the start of the second pulse shows smaller Sauter mean diameter, a higher ratio of the vaporized fuel to the total fuel and lower amount of air entrained. As a result, the equivalence ratio of the split injection is higher. After the second pulse injection, the split injection shows smaller Sauter mean diameter, a lower ratio of the vaporized fuel and the similar amount of air entrained comparing with the single-pulse injection. Consequently, the equivalence ratio of the split injection becomes lower.

在定容容器中对超临界环境(环境气体的温度和压力均高于燃料的临界点)喷射燃料射流的混合气形成特性进行了实验研究。采用双波长激光吸收散射(LAS)技术对超临界燃烧室环境下的柴油机和直喷式汽油机的喷雾特性和混合气特性进行了研究。考察了喷嘴孔径、孔L/D和注射压力的影响。对单脉冲进样和双脉冲分流进样进行了比较。主要研究结果如下：随着喷嘴孔径的减小，由于Sauter平均直径的减小，燃料的蒸发增加，进入燃料射流的空气量减少，从而使汽相当量比略高。随着喷油压力的增加，由于索特尔平均直径的减小，燃油蒸发增加，携带的空气量增加，作为这些变化的平衡，汽相的当量比变得略低。与单脉冲喷油相比，二次脉冲喷油前的分流喷油具有较小的索特尔平均直径、较高的燃油汽化比和较低的带气量。因此，分流喷射的当量比更高。二次脉冲喷油后，分体式喷油比单脉冲喷油具有更小的索特尔平均直径、更低的燃油汽化比和相近的进气量。因此，分流喷射的当量比变得更低。

项目成果

西田: "ホールノズルからの噴霧と混合気の特性-直噴ガソリンと直噴ディーゼル噴射系の比較-"第12回微粒化シンポジウム講演論文集. 227-232 (2003)

西田：“孔式喷嘴的喷雾和混合物的特性 - 直喷汽油和直喷柴油喷射系统的比较 -”第 12 届雾化研讨会论文集 227-232（2003）。

Li: "Effect of Injection Splitting on Mixture Formation of Fuel Spray Injected by High Pressure Swirl Injector for DISI Engines"Proceedings of the 8th Conference of ILASS-Asia. 57-64 (2003)

李：“喷射分流对 DISI 发动机高压旋流喷射器喷射燃油喷雾混合物形成的影响”ILASS-Asia 第八届会议论文集。

Effect of Injection Parameter on Mixture Properties of D.I. Diesel Spray

注射参数对 D.I. 混合物性能的影响

• 发表时间: 2004
• 期刊: Proceedings of the 13th Symposium (ILASS-Japan) on Atomization
• 作者: Nomura;Shinsuke
• 通讯作者: Shinsuke

スプリット噴射が直噴ガソリン噴霧の周囲気体流動に及ぼす影響LIF-PIV法による測定

分次喷射对直喷汽油喷雾环境气体流量的影响 LIF-PIV 法测量

• 发表时间: 2003
• 期刊: 第12回微粒化シンポジウム講演論文集
• 作者: Zhang;Yuyin;Yu Yin Zhang;Yu Yin Zhang;西田恵哉;尾上 剛
• 通讯作者: 尾上 剛

尾上: "スプリット噴射が直噴ガソリン噴霧の周囲気体流動に及ぼす影響 LIF-PIV法による測定"第12回微粒化シンポジウム講演論文集. 265-270 (2003)

Onoue：“通过LIF-PIV方法测量的分流喷射对直喷汽油喷雾环境气体流量的影响”第12届原子化研讨会论文集265-270（2003）。