多尺寸水滴喷雾掺混增强效应

doi:10.7527/S1000-6893.2023.29130

Abstract

Abstract:

To ensure the safety of modern aircraft under icing meteorological conditions， document AC20-71A provides specific methods for compliance testing with airworthiness regulations， among which the consistency of ice wind tunnel tests and artificial ice cloud droplets with real icing conditions are the focus of current research. To attenuate the changes in surface ice shape characteristics caused by differences in the spatial distribution of water droplets of different particle sizes， we design a vortex generator to induce airflow spin and mix the spatial distribution of discrete water droplets of different sizes. A Discrete Random Walk （DRW） model and the Rosin-Rammler droplet size distribution function are used to investigate the effects of changes in the droplet jet angle and vortex generator structure on the spatial distribution of droplets. The annular low-pressure zone generated by the vortex generator is found to be effective in improving the droplet axial accumulation phenomenon. Combining the kernel density estimation method， we determine that the optimal homogenization test cross-section is about 400 mm， 10 times the thickness of the vortex generator， and the strongest doping enhancement effect to be achieved at a 15° deflection angle and a 5° jetting angle.

Key words: icing, mixing, vortex generator, kernel density estimation, homogenization

CLC Number:

V211.41

Xiaogang XU, Yang ZHANG, Tianbo WANG, Xudong MA, Gang CHEN. Mixing enhancement effect of multi-size water droplet spray[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(S2): 729130.

Figures/Tables 14

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

Table 1

State of calculation

序号	偏转角 $θ / (°)$	喷射角 $φ / (°)$
VG1_5	15	5
VG1_15	15	15
VG1_30	15	30
VG2_5	45	5
VG3_5	90	5
VG0		5/15/30

Table 1

Fig.7

Fig.8

Fig.9

Fig.10

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Fig.12

Fig.13

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Mixing enhancement effect of multi-size water droplet spray

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