| 王震,胡勇,邱榕,程诚,蒋勇.柴油/四氢呋喃/乙醇的燃烧与微爆特性实验研究[J].火灾科学,2023,32(4):207-215. |
| 柴油/四氢呋喃/乙醇的燃烧与微爆特性实验研究 |
| Experimental study on the combustion and micro-explosion characteristics of the diesel/tetrahydrofuran/ethanol blend droplets |
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| DOI：10.3969/j.issn.1004-5309.2023.04.01 |
| 基金项目: |
| 作者 | 单位 | | 王震 | 中国科学技术大学火灾科学国家重点实验室,合肥,230026 | | 胡勇* | 中国科学技术大学火灾科学国家重点实验室,合肥,230026 | | 邱榕* | 中国科学技术大学火灾科学国家重点实验室,合肥,230026 | | 程诚 | 中国科学技术大学火灾科学国家重点实验室,合肥,230026 | | 蒋勇 | 中国科学技术大学火灾科学国家重点实验室,合肥,230026 |
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| 中文关键词: 乙醇柴油 点火延迟时间 燃烧速率 液体燃烧 微爆特性 |
| 英文关键词:Ethanol diesel Ignition delay time Burning rate Micro Liquid combustion Micro-explosion characteristic |
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| 中文摘要: |
| 液体燃料泄漏会造成巨大的灾害,多组分的可再生能源使得液体燃料的物性更加复杂。为进一步探索燃油在其蒸发燃烧过程中的物性特性,使用悬挂法开展了不同乙醇浓度的柴油/四氢呋喃/乙醇液滴在不同环境温度下的燃烧和微爆特性研究。研究发现,乙醇的添加使得柴油发生了微爆现象,随着乙醇浓度的增加液滴的微爆强度逐渐上升。液滴的点火延迟时间呈先下降后迅速升高的趋势,含有20%乙醇浓度的柴油液滴具有最短的点火延迟时间。液滴着火后,其燃烧持续时间随乙醇浓度增加呈线性下降的趋势,其中乙醇浓度为20%时液滴的燃烧持续时间偏离拟合线较多。掺混了乙醇的柴油液滴平均燃烧速率比纯柴油有所提高:当乙醇浓度为10%时,液滴平均燃烧速率达到最高值,随后略微下降;当乙醇浓度超过30%时,液滴的平均燃烧速率保持稳定。液滴的整体燃烧速率与点火延迟时间趋势相反,在乙醇浓度20%时升到最高随后下降。 |
| 英文摘要: |
| The leakage of liquid fuels can cause great disasters, and the multi-component renewable energy sources make the physical properties of liquid fuels more complex. To further explore the physical properties of fuel during its evaporative combustion, this paper conducts a study on the combustion and micro-explosion characteristics of diesel/ethanol/tetrahydrofuran droplets with different ethanol concentrations at different ambient temperatures by using the suspension method. It was found that the addition of ethanol caused the micro-explosion of diesel fuel, and the micro-explosion intensity of the droplets increased gradually with the increase of ethanol concentration. The ignition delay time of the droplets showed a first decreasing and then rapidly increasing trend, and the diesel droplets containing 20% ethanol concentration had the shortest ignition delay time. After the droplet ignited, its burning duration tended to decrease linearly with the increase of ethanol concentration, where the burning duration of the droplet deviated more from the fitted line when the ethanol concentration was 20%. The average combustion rate of diesel droplets blended with ethanol increased compared with pure diesel: when the ethanol concentration was 10%, the average combustion rate of droplets reached the highest value and then decreased slightly; when the ethanol concentration exceeded 30%, the average combustion rate of droplets remained stable. The overall burning rate of droplets was opposite to the ignition delay time trend, rising to the highest at 20% ethanol concentration and then decreasing. |
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