NNW⁃ICE软件的三维结冰模型及精度验证

doi:10.7527/S1000-6893.2023.29188

Abstract

Abstract:

Icing is a serious threat to the flight safety of aircraft， and numerical simulation is one of the important methods for studying icing. The NNW-ICE software is a completely independent and controllable icing numerical simulation software developed by China Aerodynamics Research and Development Center. The three-dimensional icing model in the software additionally considers the rime ice accretion with evaporation in the energy equation and the influence of surface contact angles on water film flow compared with traditional Shallow Water Icing Model （SWIM） and Myers icing models. In terms of numerical calculation methods， the software uses the finite volume method to discretize equations， expands the applicability of the model to unstructured grids of complex geometries， and integrates multiple solvers such as first-order explicit solver， fourth-order four-step Runge-Kutta explicit solver， first-order implicit solver， and second-order one-step Runge-Kutta implicit solver. This study also verifies the accuracy of the software with ice wind tunnel test results and results calculated by the commercial software FENSAP-ICE. The results of NNW-ICE are in good agreement with the experimental results， and the overall accuracy is better than that of the FENSAP-ICE software.

Key words: NNW-ICE software, computational scheme, water film flow, ice accretion, icing software

CLC Number:

Ningli CHEN, Xian YI, Qiang WANG, Jinghao REN. Three⁃dimensional model for ice accretion in NNW⁃ICE software and validation of its precision[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(12): 129188-129188.

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工况	U₀/ （m·s^-1）	T₀/ K	LWC/ （g·m^-3）	MVD/ μm	AoA/ （°）	t/ min
Case 1	90.0	268.3	0.540	20	4.5	6.0
Case 2	128.6	263.6	0.500	20	1.5	3.6
Case 3	128.6	262.7	0.540	20	1.5	3.0
Case 4	90.0	258.2	0.540	20	4.5	6.0
Case 5	90.0	255.1	0.535	20	4.5	6.0

方法	驻点冰厚	上冰角/（°）
NASA试验	0.007C	71
FENSAP	0.004C
FENSAP/多步	0.004C	110
NNW-ICE	0.007C	78

工况	U₀/ （m·s^-1）	T₀/ K	LWC/ （g·m^-3）	MVD/ μm	AoA/（°）	t/ min
Case 6	102.8	265.37	0.55	20	3.5	7
Case 7	102.8	262.04	0.55	20	3.5	7
Case 8	102.8	256.49	0.55	20	3.5	7
Case 9	102.8	250.37	0.55	20	3.5	7

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Three⁃dimensional model for ice accretion in NNW⁃ICE software and validation of its precision

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