黏性对液滴偏心撞击旋转壁面铺展特性的影响

doi:10.7527/S1000-6893.2024.29847

Abstract

Abstract:

Droplet impact on the rotating wall widely exists in the engineering field， such as rain ingestion and ice accretion occurring on aircraft engines， which will lead to efficiency loss and even safety problems. Therefore， it is of great significance to study the impact of liquid droplets on the rotating wall. An experimental set-up of droplet impacting on a rotating disc is built and experiments are conducted and recorded with a high-speed camera. The effects of the rotating speed and viscosity on the droplet spreading after off-axis impact are studied while the droplet size， impact velocity， surface tension and impact position remain unchanged. The evolution of droplet diameter data along the radial and tangential directions was quantitatively obtained by post-processing the recoded images. The experimental results show that the radial-tangential spreading dynamic follows four different regimes with the rotational Bond number and rotational Reynolds number： impact inertia force-adhesion force， impact inertia force-adhesion force/viscous force transition， impact inertia force/centrifugal force transition-adhesion force， and impact inertia force-viscous force. In the impact inertial force dominant regime for the radial spreading， the maximum radial spreading factor decreases with the Ohnesorge number and the rotational Bond number， and the radial spreading factor evolves with the dimensionless time t/（Oh·T） by a -1/3 pow-law. In the tangential adhesion force dominant regime， the tangential spreading rate of droplets exhibits a 2/3 pow-law with the dimensionless time t/（Oh·T）. In the tangential viscosity force dominant mode， maximal spreading factors are reached in the tangential direction.

Key words: droplet impact, rotating wall, viscosity, rotating speed, off-axis impact, spreading factor

CLC Number:

V219

Wen YANG, Xinxi ZHANG, Xiangyu WANG, Chuanyang LIU, Yunbo ZHANG. Effect of liquid viscosity on droplet spreading after off⁃axis impact on rotating wall[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(16): 129847-129847.

Figures/Tables 21

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实验工质	实验温度T/℃	密度ρ/（kg·m^-3）	黏度μ/（Pa·s）	表面张力σ/（N·m^-1）	奥内佐格数Oh
水	22.1	997	9×10^-4	0.072	6.9×10^-4
G3W7	23.6	1 074	2.2×10^-3	0.070	1.6×10^-3
G5W5	24.5	1 120	5.7×10^-3	0.068	4.2×10^-3
G6W4	26.7	1 154	8.3×10^-3	0.067	6.1×10^-3
G7W3	27.1	1 178	1.64×10^-2	0.066	1.1×10^-2
G8W2	25.3	1 208	6.20×10^-2	0.065	4.5×10^-2
甘油	26.3	1 256	7.615×10^-1	0.062	5.6×10^-1

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Effect of liquid viscosity on droplet spreading after off⁃axis impact on rotating wall

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