Effect of Fuel Injection Rate Shaping on Intermittent Spray Combustion

喷油率整形对间歇喷雾燃烧的影响

• 批准号: 10650199
• 负责人: AZETSU Akihiko
• 金额: $ 2.24万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650199/
• 关键词: Intermittent Spray Combustion; Fuel Injection; Fuel Injection Rate Shaping; Intermittent Spray; Ignition; Combustion Period; Spray Angle; Piezoelectric Actuator; 燃焼期間; 液柱; 燃焼噴射; 主燃焼; 二色法

By developing and using an original electronically controllable fuel injection system, effect of injection rate shaping on intermittent spray and combustion was studied.(1) Development of Fuel Injection System for Variable Injection Rate Shaping : In our system, the arbitrary injection rate shaping was obtained by controlling the movement of nozzle needle directly with piezoelectric actuator. By using a high power actuator, injection pressure of up to 100MPa was achieved in this study.(2) Effect in Single Injection : At the same conditions of injection period, peak injection rate and total amount of fuel injected, the spray with triangular injection rate shaping and different slope of injection rate rise for some injection pressures was examined. It was found that the slope of injection rate rise made great influences on the temporal evolution of the spray, the ignition and main combustion of the spray flame. Higher injection pressure enhanced the growth of spray and promoted the combustion especially at initial stage. These tendencies result in a shorter combustion period for all injection rate shaping. From the viewpoint of shorter combustion period, the optimum fuel injection rate shaping changes with injection pressures.(3) Effect in Two Stage Injection : It was made clear that the injection interval gives a large effect on the spray evolution of 2nd stage injection and overall combustion. These effects change with the injection rate shaping of 2nd stage injection.(4) Effect of Periodical Fluctuation of Injection Rate : Effect of periodical fluctuation of injection rate with relatively higher frequency was examined. From the visualized experiments, it was made clear that the spray dispersion becomes wider at some specified frequencies. In the spray with periodical fluctuation, a large cloud of fuel droplets was ejected from the dense liquid core and the length of liquid core becomes very short at above mentioned frequencies.

通过开发和使用一种新颖的电控燃油喷射系统，研究了喷油规律对间歇喷雾和燃烧的影响。(1)可变喷油率成形燃油喷射系统的研制：该系统采用压电陶瓷驱动器直接控制喷油针的运动，实现任意喷油率成形。通过使用大功率致动器，注射压力高达100 MPa，在这项研究中实现。(2)单次喷射的影响：在相同的喷油周期、峰值喷油率和总喷油量条件下，研究了不同喷油压力下三角形喷油率成形和不同喷油率上升斜率的喷雾。结果表明，喷油率上升斜率对喷雾的时间演化、喷雾火焰的着火和主燃烧有很大影响。较高的喷射压力促进了喷雾的生长，促进了燃烧，特别是在燃烧初期。这些趋势导致所有喷射率成形的燃烧期较短。从缩短燃烧期的角度出发，最佳喷油规律随喷油压力的变化而变化。(3)两级喷射的影响：研究表明，喷射间隔对第二级喷射的喷雾演化和整个燃烧过程有很大的影响。这些影响随着第二级喷射的喷射速率的变化而变化。(4)注射速率周期性波动的影响：检查了注射速率以相对较高频率周期性波动的影响。从可视化实验中可以清楚地看出，在某些特定的频率下，喷雾分散变得更宽。在周期性波动的喷雾中，稠密液核中喷射出大量的燃料液滴，液核长度在上述频率下变得很短。

项目成果

Yoshifumi WAKISAKA: "Effect of Fuel Injection Rate Shaping on Spray Combustion -Effect of the Slope of Injection Rate Rise on Combustion-"Proceedings of the COMODIA 98. 441-446 (1998)

Yoshifumi WAKISAKA：“燃料喷射率整形对喷雾燃烧的影响 - 喷射率上升斜率对燃烧的影响 -”COMODIA 会议记录 98. 441-446 (1998)

Yoshifumi WAKISAKA: "Effect of Fuel Injection Rate Shaping on Spray Combustion -Effect on Distributions of Soot and Temperature in Flame-"Proceedings of The 15th Internal Combustion Engine Symposium. 369-374 (1999)

Yoshifumi WAKISAKA：“燃油喷射率整形对喷雾燃烧的影响 - 对火焰中烟灰和温度分布的影响 -”第 15 届内燃机研讨会论文集。

Yoshifumi Wakisaka: "Effect of Fuel Injection Rate Shaping on Spray Combustion-Effect on Distributions of Soot and Temperature in Flame-" The 15th Internal Combustion Engine Symposium. (to be published). (1999)

Yoshifumi Wakisaka：“燃油喷射率整形对喷雾燃烧的影响-对火焰中烟灰和温度分布的影响-”第15届内燃机研讨会。

Akihiko Azetsu: "Effect of Periodical Fluctuation of Fuel Injection Rate on Fuel Spray"8^<th> Int.Conf.on Liquid Atomization and Spray Systems. (2000)

Akihiko Azetsu：“燃油喷射率周期性波动对燃油喷雾的影响”第 8 次液体雾化和喷雾系统国际会议。

脇坂佳史: "2段噴射の噴射率形状・噴射間隔が非定常噴霧燃焼に及ぼす影響" 日本機械学会1999年度年次大会. (発表予定). (1999)

Yoshifumi Wakisaka：“两阶段喷射中喷射速率形状和喷射间隔对非稳态喷雾燃烧的影响”日本机械工程师学会 1999 年年会（预定报告）。