Head Shape Optimization and Water Entry Performance Analysis of Trans-medium Aircraft

doi:10.12382/bgxb.2021.0538

Abstract

Abstract: The head shape of a trans-medium aircraft is one of the important factors affecting the kinematics in the trans-medium process. The common two-parameter cubic polynomial curve is used to obtain the shape curve dimensionless parameters of the trans-medium aircraft head shape. The Arbitrary Lagrangian-Eulerian method is adopted to complete the fluid-structure coupling modeling and performance analysis for trans-medium aircraft with different head shapes, and investigate the terminal velocity of different head shapes after entering the water and the maximum impact stress received during the water entry process. Taking the maximum terminal velocity and the minimum impact stress as the optimization goals, multi-objective optimization is carried out on the head shape of the trans-medium aircraft, and an optimal head shape is obtained. The results show that the optimal head shape of the trans-medium aircraft has significantly reduced speed attenuation and impact stress compared with the basic shape, the optimal head shape of the trans-medium aircraft effectively reduces the energy loss of the aircraft in the water-entry process. It can provide insights into the head shape design of the trans-medium aircraft.

Key words: trans-mediumaircraft, fluid-structurecoupling, optimizationdesignofheadshape, waterentryperformanceanalysis

CLC Number:

MA Wenchao, MENG Fanmin, MA Nuo, MENG Junhui, ZOU Ruping. Head Shape Optimization and Water Entry Performance Analysis of Trans-medium Aircraft[J]. Acta Armamentarii, 2022, 43(10): 2588-2597.

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