ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Ditching Performance of Silent Aircraft SAX-40 in Hybrid Wing-body Configuration
Received date: 2012-12-06
Revised date: 2013-03-19
Online published: 2013-04-11
Supported by
Aeronautical Science Foundation of China (20102351023);Research Fund for the Doctoral Program of Higher Education of China (20091102120021);National Basic Research Program of China (2009CB72400101)
The planned ditching of aircraft SAX-40 on calm water is numerically simulated to investigate the ditching performance of the hybrid wing-body configuration. The unsteady Reynolds-averaged Navier-Stokes (URANS) equations and the Realizable κ-ε turbulence model are solved by a fluent solver. The relative motion between the aircraft and water is handled by the dynamic mesh method. The air-water interface is tracked by a volume of fluid (VOF) model. During the ditching process, the impact brings about the positive pressure peak on the aircraft's lower surface near the waterline; and the planing brings forth the negative pressure on the aft curved portion of the aircraft's lower surface, resulting in a suck force and a strong nose-up pitch motion. As the aircraft touches the water, the normal load increases rapidly to 2.87G, and the longitudinal load to 1.05G. The slamming pressure reaches a peak of about 720 kPa. This airplane bounces up from the water and this defective performance should be considered during the design of a hybrid wing-body configuration.
GUO Baodong , QU Qiulin , LIU Peiqing , ZHOU Zhijie , ZHANG Chun . Ditching Performance of Silent Aircraft SAX-40 in Hybrid Wing-body Configuration[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013 , 34(11) : 2443 -2451 . DOI: 10.7527/S1000-6893.2013.0179
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