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过程工程学报 ›› 2022, Vol. 22 ›› Issue (6): 811-818.DOI: 10.12034/j.issn.1009-606X.221236

• 研究论文 • 上一篇    下一篇

铝/乙醇基纳米浆体燃料的着火燃烧特性研究

郭朋, 陈维齐, 孙运兰*, 朱宝忠*   

  1. 常州大学石油工程学院,江苏 常州 213164
  • 收稿日期:2021-07-30 修回日期:2021-09-08 出版日期:2022-06-28 发布日期:2022-06-28
  • 通讯作者: 孙运兰 yunlansun@163.com
  • 作者简介:郭朋(1994-),男,山东省临沂市人,硕士研究生,工程热物理专业,E-mail: 853565775@qq.com;通讯联系人,孙运兰,E-mail: ylsun@cczu.edu.cn;朱宝忠, E-mail: bzzhu@cczu.edu.cn.
  • 基金资助:
    高能纳米金属浆体燃料的两相分散机制及耦合燃烧机理研究

Study on the ignition and combustion characteristics of aluminum/ethanol based nanoslurry fuels

Peng GUO,  Weiqi CHEN,  Yunlan SUN*,  Baozhong ZHU*   

  1. School of Petroleum Engineering, Changzhou University, Changzhou, Jiangsu 213164, China
  • Received:2021-07-30 Revised:2021-09-08 Online:2022-06-28 Published:2022-06-28
  • Contact: SUN Yun-lan yunlansun@163.com

摘要: 为了明确纳米铝粉从低浓度到高浓度变化对液体碳氢燃料着火燃烧特性的影响,采用液滴悬挂法研究了不同温度下(700~800℃)乙醇液滴和添加不同浓度(2.5wt%, 10wt%, 15wt%和20wt%)纳米铝粉的铝/乙醇基纳米浆体燃料液滴的着火燃烧特性。利用高速摄影系统捕捉了液滴整个燃烧过程,分析了其液滴寿命。通过热电偶对液滴附近气相温度的测量,获得了其着火性能参数。结果表明,添加纳米铝粉可以改善乙醇液滴的着火性能。不同铝粉浓度改善效果不同,低浓度时效果较好,着火延迟时间显著缩短,点火温度明显降低。随温度升高,乙醇及添加纳米铝粉的铝/乙醇基纳米浆体燃料液滴着火延迟时间及着火温度均明显降低。纳米铝粉(S2)对乙醇(S1)着火延迟时间和液滴寿命的降幅在750℃最大,其降幅分别达42.20%和18.43%。纳米铝粉(S3)着火温度降低,其最大降低幅度也出现在750℃,相对于乙醇(S1)降低幅度达28.57%。一定铝粉浓度范围内,液滴微爆炸程度和微爆炸时长随铝粉浓度升高而增大,但铝粉浓度超过10wt%后趋势变得平稳。

关键词: 乙醇, 铝粉浓度, 着火燃烧性能, 液滴寿命, 微爆炸

Abstract: With the rapid development of aerospace, the requirements for liquid hydrocarbon fuels with the high energy density are increasing. The energy density of traditional hydrocarbon fuels is low, which cannot meet the application requirements. Aluminum powder has a high energy density. The addition of nano-aluminum powder to hydrocarbon fuels can increase the energy density and improve the ignition and combustion characteristics. To determine the effect of the change of nano-aluminum powder from low concentration to high concentration on the ignition and combustion characteristics of liquid hydrocarbon fuels, the ignition and combustion characteristics of aluminum/ethanol based nanoslurry fuel droplets with different concentrations (2.5wt%, 10wt%, 15wt%, and 20wt%) of nano-aluminum powder were studied by a droplet hanging method. The whole combustion process of the droplet was captured by a high speed photography system. The ignition delay time, the ignition temperature, and the droplet life were analyzed by a temperature acquisition system and an image collection system. The results showed that the temperature and the concentration of nano-aluminum powder had great influence on the droplet combustion characteristics. The ignition delay time and ignition temperature of the ethanol droplet can be reduced by adding nano-aluminum powder, and the droplet life can be shortened. Especially, the ethanol droplet with 2.5wt% nano-aluminum powder had the shortest ignition delay time. The ignition delay time and droplet life of sample S2, ignition temperature of sample S3, can be decreased by 42.20%, 18.43%, and 28.57% contrast to sample S1 at 750℃, respectively. With the increase of temperature, the ignition delay time and the ignition temperature of ethanol and aluminum/ethanol nanoslurry fuel droplets were significantly reduced. When the temperature was higher than 750℃, their decrease amplitude decreased. The concentration of nano-aluminum powder was closely related to the micro-explosion of droplet. The degree and the duration of the micro-explosion of droplet increased with the increase of nano-aluminum powder concentration, while this trend became stable when the concentration of nano-aluminum powder exceeded 10wt%. It was proved that the concentration of nano-aluminum powder and the ambient temperature were both important factors to affect the combustion characteristics of the aluminum/ethanol nanoslurry fuel droplet.

Key words: ethanol, aluminum powder concentration, ignition and combustion performance, droplet life, micro-explosion