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郭立梅, 吕明, 宁智. 同轴气流式液体射流分裂液滴粒径研究. 力学学报, 2022, 54(2): 405-413. DOI: 10.6052/0459-1879-21-375
引用本文: 郭立梅, 吕明, 宁智. 同轴气流式液体射流分裂液滴粒径研究. 力学学报, 2022, 54(2): 405-413. DOI: 10.6052/0459-1879-21-375
Guo Limei, Lü Ming, Ning Zhi. Study on the droplet size of liquid jet in a coaxial airflow. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(2): 405-413. DOI: 10.6052/0459-1879-21-375
Citation: Guo Limei, Lü Ming, Ning Zhi. Study on the droplet size of liquid jet in a coaxial airflow. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(2): 405-413. DOI: 10.6052/0459-1879-21-375

同轴气流式液体射流分裂液滴粒径研究

STUDY ON THE DROPLET SIZE OF LIQUID JET IN A COAXIAL AIRFLOW

  • 摘要: 针对同轴气流式液体射流分裂液滴粒径预测模型缺乏的现状, 结合射流线性稳定性理论, 建立了基于临界模数的同轴气流式黏性液体射流分裂液滴粒径表达式, 在此基础上, 分别研究了气流旋拧(气流同时存在轴向和周向运动)及流体物性(气体可压缩性、液体黏性、气液密度比和表面张力)对液滴粒径的影响规律. 研究发现: 周围气流轴向引射作用和同轴旋转作用均会导致分裂液滴粒径整体呈先增大后减小的趋势; 且在气流仅作同轴旋转运动时, 相同临界模数下气流旋转对分裂液滴粒径的影响较小. 在本文的研究参数范围内, 分裂液滴粒径随气体可压缩性和气液密度比的增加而减小, 随液体黏度和表面张力的增加而增加; 其中, 气体可压缩性在气流作同轴旋转运动时作用效果更强, 液体黏度在气流作同轴引射运动时效果更为显著. 研究结果对同轴气流式液体射流的分裂液滴粒径预测具有一定的理论意义和工程应用价值.

     

    Abstract: In view of the lack of prediction model of droplet size of the liquid jet in a coaxial airflow, combined with the linear stability theory of the liquid jet, the mathematical expression of droplet size of the liquid jet in a coaxial airflow based on the critical modulus is established in this paper. On this basis, the effects of surrounding gas twisting (the surrounding airflow has both axial and circumferential motion) and fluid physical parameters (gas compressibility, liquid viscosity, gas liquid density ratio, and surface tension) on droplet size of liquid let are studied respectively. The research results show that: (1) both the axial ejection and coaxial rotation of the surrounding airflow will lead to the droplet size increasing first and then decreasing. When there is only rotation motion of the surrounding airflow, the surrounding airflow rotation has little effect on the droplet size of liquid jet under the same critical modulus. (2) Within the range of parameters studied in this paper, the droplet size of liquid jet decreases with the increasing of the surrounding gas compressibility and the gas liquid density ratio, and the droplet size of liquid jet increases with the increasing of the liquid viscosity and surface tension. The effect of gas compressibility on droplet size of liquid jet is stronger when the surrounding airflow rotates coaxially, while the effect of liquid viscosity on droplet size of liquid jet is more significant when the surrounding airflow ejects coaxially. The research results have certain theoretical significance and engineering application value for the droplet size prediction of liquid jet in a coaxial airflow.

     

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