Effect of Turbulent Flow Field on Flame Developing in Fuel Gradient Field in a Constant-Volume Vessel
定容容器燃料梯度场中湍流场对火焰发展的影响
基本信息
- 批准号:13650222
- 负责人:
- 金额:$ 2.3万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:2001
- 资助国家:日本
- 起止时间:2001 至 2002
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In direct injection spark-ignition engine, thermal efficiency can increase about 20-30% in low load, leading to decrease in carbon dioxide. However, die phenomena are very complicated and difficult in actual engines. Therefore, in order to investigate each phenomenon fundamentally, it is necessary to make the fields easy to analyze. In this study, a swirl flow was produced in a constant-volume vessel of disk type and a flame developed axisymmetrically by igniting at the center with supplying fuel of propane at the center of the combustion chamber. Experiments were done in various turbulent flow and concentration fields. Turbulent flow was measured with a laser Doppler anemometer and fuel concentration field was measured with a laser induced fluorescence method. A high-speed video camera was used to capture the flame development Hydrocarbon after the combustion was measured with absorption method using a laser of 3.39 micrometer wavelength.Main results for overall combustion are as follows: (1) In this experiment, both turbulent flow and concentration fields were changed. However, it was found that average fuel concentration is almost the same but the turbulent floe is different Therefore, only the effect of turbulence intensity was investigated. (2) The combustion efficiency was over 97% when overall equivalence ratio is larger man 0.7 while the combustion efficiency presented lower value of 0.3 in some cases at lower equivalence ratio less than 0.7. (3) When richer fuel existed near the center of The combustion chamber, it was observed that the flame developed with a lot of luminous parts in it As for initial combustion, main result is summarized as follows: (4) The mixture can ignite and flame propagates even outside the flammable limits because inhomogeneous mixture includes a lot of richer and leaner parts that are within the flammable limits including stoichiometric condition.
在直喷式火花点火发动机中,低负荷时热效率可提高约20-30%,从而减少二氧化碳排放。然而,在实际发动机中,模具现象非常复杂和困难。因此,为了从根本上研究每种现象,有必要使场易于分析。在这项研究中,产生的旋流在一个定容容器的盘型和火焰轴对称发展的中心点火与供应燃料的丙烷在燃烧室的中心。在各种湍流和浓度场中进行了实验。采用激光多普勒测速仪测量湍流流场,采用激光诱导荧光法测量燃油浓度场。用高速摄像机拍摄了火焰的发展过程,用波长为3.39 μ m的激光吸收法测量了燃烧后的碳氢化合物含量,得到了如下结果:(1)在本实验中,湍流场和浓度场都发生了变化。然而,它被发现,平均燃料浓度几乎相同,但湍流絮体是不同的,因此,只有湍流强度的影响进行了研究。(2)当总当量比大于0.7时,燃烧效率可达97%以上,而当总当量比小于0.7时,燃烧效率仅为0.3。(3)当燃烧室中心附近存在较浓的燃料时,火焰中有大量的发光部分。对于初始燃烧,主要结果如下:(4)由于不均匀混合气中含有大量的处于可燃极限(包括化学计量条件)内的较浓和较稀的部分,混合气在可燃极限外也能着火并传播。
项目成果
期刊论文数量(15)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Nobuyuki Kawahraほか4名: "Effects of Swirl Turbulent Flow Field and Inhomogeneous Concentration Field on Combustion of Fuel-Air Mixture in a Constant Volume Vessel"Proceedings of the Fifth International Symposium on Diagnostics and Modeling of Combustion in
Nobuyuki Kawahra等4人:“涡流湍流流场和非均匀浓度场对定容容器中燃料-空气混合物燃烧的影响”第五届国际燃烧诊断与模拟研讨会论文集
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- 影响因子:0
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冨田栄二ほか4名: "定容容器内燃料-空気混合気の燃焼に及ぼす乱流場・不均一濃度場の影響"日本機械学会中国四国支部第41期総会講演会講演論文集. No.035-1. 223-224 (2003)
富田英二等4人:《湍流流场和非均匀浓度场对定容容器内燃油-空气混合物燃烧的影响》日本机械工程学会中国四国分会第41次会员大会论文集035-1号(2003年)
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Eiji Tomita, Nobuyuki Kawahara, Sadami Yoshiyama, Akihifco Kakuho, Teruyuki Itoh and Yoshisuke Hamamoto: "in situ fuel concentration measurement near spark plug in spark-ignition engines by 3.39 μm infrared laser absorption method"Proceedings of Combustio
Eiji Tomita、Nobuyuki Kawahara、Sadami Yoshiyama、Akihifco Kakuho、Teruyuki Itoh 和 Yoshisuke Hamamoto:“采用 3.39 μm 红外激光吸收法对火花点火发动机火花塞附近的燃油浓度进行原位测量”Combustio 论文集
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- 影响因子:0
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Eiji Tomitaほか5名: "in situ fuel concentration measurement near spark plug in spark-ignition engines by 3.39μm infrared laser absorption method"Proceedings of Combustion Institute. Vol.29(印刷中). (2002)
Eiji Tomita 等 5 人:“采用 3.39μm 红外激光吸收法测量火花塞附近的燃油浓度”,燃烧研究所论文集,第 29 卷(出版中)。
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- 影响因子:0
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Nobuyuki Kawahara, Eiji Tomita, Atsushi Nishiyama, Sadami Yoshiyama, and Yoshisuke Hamamoto: "Effects of Swiri Turbulent Flow Field and Inhomogeneous Concentration Field on Combustion of Fuel-Air Mixture in a Constant Volume Vessel"Proceedings of the Fift
Nobuyuki Kawahara、Eiji Tomita、Atsushi Nishiyama、Sadami Yoshiyama 和 Yoshisuke Hamamoto:“Swiri 湍流流场和不均匀浓度场对定容容器中燃料-空气混合物燃烧的影响”第五届会议论文集
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TOMITA Eiji其他文献
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{{ truncateString('TOMITA Eiji', 18)}}的其他基金
High response measurement of exhaust gas temperature from an engine by using laser interferometry with two wavelength
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16K14513 - 财政年份:2016
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$ 2.3万 - 项目类别:
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Elucidation of mechanism of high thermal efficiency combustion owing to auto-ignition in the latter half of combustion in gas engines
阐明燃气发动机燃烧后半段自点火带来的高热效率燃烧机理
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16H04601 - 财政年份:2016
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$ 2.3万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
High response measurement of exhaust temperature in an engine by using laser interferometry
使用激光干涉法对发动机排气温度进行高响应测量
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25630407 - 财政年份:2013
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$ 2.3万 - 项目类别:
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Investigation of ignition and combustion processes of ultra-combustion heat system with containing water due to nonequilibrium plasma
非平衡等离子体含水超燃烧热系统的点火和燃烧过程研究
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22246025 - 财政年份:2010
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Optical diagnostics of nanosecond and nanometer ignition and quenching mechanism
纳秒和纳米点火和淬灭机制的光学诊断
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18360102 - 财政年份:2006
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$ 2.3万 - 项目类别:
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Optical diagnostics of nanosecond and nanometer ignition and quenching
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16360105 - 财政年份:2004
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$ 2.3万 - 项目类别:
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Effect of Mixture Condition on Combustion of Fuel〜Air Inhomogeneous Mixture in a Constant-Volume Vessel
混合条件对定容容器内燃料〜空气不均匀混合物燃烧的影响
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10650212 - 财政年份:1998
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$ 2.3万 - 项目类别:
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