Study on Particle Size Prediction of Sodium Atomization Based on Unstable Wave Theory
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摘要: 钠雾化粒径是影响钠雾火燃烧强度的关键因素。由于钠的化学性质不稳定，通常采用水模拟钠开展雾化实验，以得到两者粒径关系。本文基于不稳定波理论，建立了由液体物性参数和雾化压差表征的液体雾化粒径相似性模型，并从压差和物性参数2个角度利用多种液体的不同雾化实验验证模型的适用性。搭建了采用喷嘴模拟破口的水雾化实验装置，得到压差范围在0.1~0.5 MPa范围的水雾化液滴平均粒径，预测了300~600℃的钠在不同压差下雾化液滴的平均粒径。通过本文建立的粒径相似性模型和水模拟钠雾化实验装置，可以实现不同压差下钠泄漏雾化粒径的预测，为钠雾火事故研究提供参考。Abstract: The particle size of sodium atomization is the key factor affecting the combustion intensity of sodium spray fire. Because of the unstable chemical properties of sodium, water is usually used to replace sodium to carry out atomization experiments, and it is necessary to obtain the particle size conversion relationship between them. In this paper, based on the unstable wave theory, the particle size similarity model of liquid atomization characterized by liquid physical parameters and atomization pressure difference is established. The applicability of the model is verified by different atomization experiments of various fluids from the perspectives of pressure difference and physical parameters. Furthermore, an experimental facility for water atomization using nozzle to simulate the crack is designed, the average particle size of water atomized droplets with pressure difference of 0.1~0.5 MPa is obtained, and the average particle size of sodium atomized droplets at 300~600℃ under different pressure differences is predicted. The particle size similarity model and the experimental device for sodium atomization simulation using water established in this paper can realize the prediction of sodium atomization particle size under different pressure differences, and provide reference for the research of Sodium atomization fire accidents.
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Key words:
- Sodium atomization /
- Water atomization /
- Similarity /
- Particle size model /
- Unstable wave waves
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图 3 不同压差下模型的预测情况
Figure 3. Prediction of the Model under Different Pressure Differences
图 6 水模拟钠雾化实验装置示意图
P—压力测点；T—温度测点
Figure 6. Experimental Device for Simulation of Sodium Atomization Using Water
图 8 不同压差下喷嘴出口液滴的可视化图像
Figure 8. Visualization of Droplets at the Nozzle Outlet under Different Pressure Differences
图 9 水雾化液滴平均粒径随压差的变化
Figure 9. Variation of Average Particle Size of Water Atomized Droplets with Pressure Difference
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