Explosion Mechanism of Lubricating Oil Droplets in High-Temperature and High-Pressure Combustion Environments
Abstract
:1. Introduction
2. Experimental Setup
2.1. Experimental Apparatus
2.2. Data Processing
2.3. Properties of Oil and Ambient Gas
3. Results and Discussion
3.1. Ignition and Explosion of Lubricating Oil Droplets
3.2. Microphotography of Oil Droplet Explosion
3.3. Mechanism of Oil Droplet Explosion
4. Conclusions
- Lubricating oil droplets can explode and develop into a soot cloud in HCCI-like combustion environments with a short ignition delay time. As the pressure of the ambient flammable gas increases, the oil droplet explodes more severely and earlier;
- The key factor in inducing oil droplet explosions is the shock waves generated by the combustion of the ambient gas. In cases of high temperature alone, without shock waves, the oil droplet cannot explode during the entire combustion process, even if surrounded by a flame;
- The mechanism of oil droplet explosion is as follows: the impact of shock waves on the droplet deforms and breaks up the oil droplet into many tiny droplets. The evaporation and pyrolysis of these tiny droplets in a high-temperature and high-pressure environment lacking oxygen generate a glowing soot cloud. The expansion of the soot cloud with oscillating shock waves and gas flow in the combustion chamber creates an explosion-like appearance.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Case | Factor | Method | peff/bar | Teff/K | Droplet Vol./μL |
---|---|---|---|---|---|
1 | High temperature | Pure Ar compression | 23.0 | 1659 | 1.0 |
2 | High temperature | Low-pressure SI | 10.8 | 701 | 1.0 |
3 | Pressure wave | Medium-pressure SI | 15.7 | 703 | 1.0 |
4 | Pressure wave | High-pressure SI | 22.9 | 709 | 1.0 |
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Qi, Y.; Fei, S.; Wang, Z. Explosion Mechanism of Lubricating Oil Droplets in High-Temperature and High-Pressure Combustion Environments. Lubricants 2023, 11, 118. https://doi.org/10.3390/lubricants11030118
Qi Y, Fei S, Wang Z. Explosion Mechanism of Lubricating Oil Droplets in High-Temperature and High-Pressure Combustion Environments. Lubricants. 2023; 11(3):118. https://doi.org/10.3390/lubricants11030118
Chicago/Turabian StyleQi, Yunliang, Shubo Fei, and Zhi Wang. 2023. "Explosion Mechanism of Lubricating Oil Droplets in High-Temperature and High-Pressure Combustion Environments" Lubricants 11, no. 3: 118. https://doi.org/10.3390/lubricants11030118