含盐海水飞沫的结冰风洞试验相似准则

doi:10.7527/S1000-6893.2023.29297

Abstract

Abstract:

When ships navigate in polar regions， a large amount of low-temperature salt-containing spray exists in the air. Long-term exposure to the spray can cause the upper structure of the vessel and the internal intake of gas turbines to freeze， affecting the normal navigation of the ship. Large-scale icing wind tunnels can simulate the ice accretion of sea spray on ship components or scaled models， but the corrosive effect of seawater spray can endanger equipment’s safety. Therefore， sea spray icing experiments were conducted on small-scale equipment. The study of scaling law was conducted in a wind tunnel to simulate the icing of salinity sea spray. Physical properties were tested on various components of seawater samples， obtaining the surface tension， thermal conductivity， specific heat capacity， phase transition temperature， and latent heat. On the basis of classical similarity theory， the main differences between the icing of sea spray and pure water were analyzed. The classical icing wind tunnel scaling law was adopted and modified with the extension of the water film similarity and sea spray freezing coefficient. Ultimately， a scaling parameter equation for salinity sea spray icing was established， along with a corresponding process for scaling transformation. The icing condition of the NACA0012 model under sea spray conditions was scaled with the established scaling law， and the NNW-ICE software is used to validate the scaling law. The results indicate that via establishing the scaling law， it is possible to simulate the ice shape of salinity sea spray using pure water in icing wind tunnel tests. This study provides significant theoretical support for large-scale icing wind tunnels to conduct sea spray icing tests.

Key words: sea spray, vessel icing, wind tunnel test, scaling law

CLC Number:

V211.71

Yu LIU, Mengjie QIN, Qiang WANG, Xian YI. Scaling law for salty sea spray icing wind tunnel test[J]. Acta Aeronautica et Astronautica Sinica, 2023, 44(S2): 729297.

Figures/Tables 18

Table 1

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Table 2

Fig.6

Table 3

Fig.7

Fig.8

Table 4

Scaling parameter comparison of R1 condition and its scaled conditions

工况	$K 0$	$n 0$	θ	φ	b	$W e k$
R1	3.40	0.29	6.33	3.55	0.41	0.56
S1-1	3.39	0.30	12.39	3.97	0.53	0.55
S1-2	3.33	0.29	5.51	4.59	0.29	0.56

Table 4

Fig.9

Table 5

Fig.10

Table 6

Scaling parameter comparison of R2 condition and its scaled conditions

工况	$K 0$	$n 0$	θ	φ	b	$W e k$
R2	3.40	1.14	24.75	19.07	0.34	0.56
S2-1	3.39	1.22	25.02	18.98	0.31	0.58
S2-2	3.37	0.96	23.48	17.67	0.39	0.57

Table 6

Table 7

Scaling parameter comparison of R3 condition and its scaled conditions

工况	$K 0$	$n 0$	θ	φ	b	$W e k$
R3	3.38	0.46	10.47	6.19	0.34	0.56
S3-1	3.38	0.46	10.28	6.19	0.33	0.52

Table 7

Fig.11

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样品编号	1#	2#	3#	4#	5#	6#	7#
含盐种类	NaCl	MgCl₂	KCl	CaSO₄	MgSO₄	混合盐	纯水
含盐量/（g·L^-1）	23.65	4.06	0.71	1.58	0.71	30.71	0

水	表面张力/（mN·m^-1）	比热容/（J·（g·K）^-1）	相变温度/℃	相变潜热/（J·g^-1）
含盐水	59.421	3.982	-4.47	249.5
纯水	70.447	4.274	0	345.3

工况	静温/℃	压力/kPa	风速/（m·s^-1）	MVD/μm	LWC/（g·m^-3）	时间/s	弦长/m	液态水
R1	-10	6.17	80	30	0.50	1 350	1.07	混合盐
C1	-10	6.17	80	30	0.5	1 350	1.07	纯水
S1-1	-7	6.17	60	33.5	0.69	1 304	1.07	纯水
S1-2	-6	6.17	110	26.3	0.28	1 753	1.07	纯水

工况	静温/℃	压力/kPa	风速/（m·s^-1）	MVD/μm	LWC/（g·m^-3）	时间/s	弦长/m	液态水
R2	-20	6.16	80	30.0	0.50	1 350	1.066	混合盐
C2	-20	6.16	80	30.0	0.50	1 350	1.066	纯水
S2-1	-19	10.1	60	24.6	0.72	625	0.533	纯水
S2-2	-18	10.1	60	37.9	0.64	1 406	1.066	纯水
R3	-10	6.17	80	30.0	0.50	1 350	1.066	混合盐
S3-1	-6.9	5.80	79	19.5	0.50	685	0.533	纯水

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Scaling law for salty sea spray icing wind tunnel test

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