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| Numerical simulation of atomization characteristics of Jatropha curcas oil and Jatropha biodiesel in a swirl nozzle |
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| DOI：10.12166/j.zgyz.1003-7969/2020.10.015 |
| KeyWord:Jatropha curcas oil biodiesel swirl nozzle atomization incident pressure numerical simulation atomization characteristics |
| FundProject:国家自然科学基金项目(51766007)；云南省自然科学基金项目(2018FB092)；云南省自然科学基金项目(2015FB128)；NSFC云南联合基金项目(U1602272)；省部共建复杂有色金属资源清洁利用国家重点实验室自设项目(CNMRCUTS1704) |
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| Abstract: |
| In order to understand the influence of incident pressure on the atomization characteristics of biomass fuel in a swirl nozzle, Fluent numerical simulation method was used to simulate the atomization process of Jatropha curcas oil and Jatropha biodiesel under different incident pressures. The results showed that compared with the ordinary nozzle, the swirl atomization nozzle used had better optimization effect on the average Sauter diameter (D32) ,and the internal spiral structure enhanced the turbulent intensity of atomization, making the gas-liquid two-phase mixing and the effect of breaking the droplets better. Under isothermal conditions, different incident pressures had greater influences on D32, total surface area of atomization, atomization speed and atomization penetration distance. The greater the incident pressure, the smaller the D32; the greater the incident pressure, the greater the total surface area of atomization, atomization speed and atomization penetration distance. There was a critical value for the influence of the incident pressure on D32. After the atomization incident pressure of Jatropha curcas oil and Jatropha biodiesel respectivly reached 0.8 MPa and 0.7 MPa, D32 tended to be stable and would not continue to decrease with the increase of incident pressure.Through curve fitting and analysis of droplet particle size number density, the fitting equation of the axial D32 change at different incident pressure away from different positions of the nozzle and the number density distribution of different particle sizes of atomized droplets were obtained. |
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