Simulation on Aeroelasticity of Flexible Propellers Based onRadial Point Interpolation Method

doi:10.16183/j.cnki.jsjtu.2019.308

Abstract

Abstract:

To investigate the aeroelasticity effect and propulsion performance of flexible propellers, the mature computational fluid dynamics (CFD) and computational solid dynamics (CSD) softwares are used as the platform to establish an aeroelasticity analysis framework. The radial point interpolation method (RPIM) is applied to achieve the transmission of displacement, while the transfer of aerodynamic loads is assisted by the principle of virtual displacement. This method can avoid generating singular interpolation matrix. Moreover, it has numerical stability, which is suitable for nodes with arbitrary distribution. Furthermore, it can avoid energy loss during data transmission. The update of fluid domain grid is implemented by using the Delaunay mapping method. The results show that the maximum deformation of blade along the incoming flow direction can reach 9.4% of blade radius, and the deformation in the rotation plane is about 52.1% of flow direction. The deformation exerts a greater positive pressure on the windward side of the propeller, which, in turn, results in a higher thrust and torque in flexible propellers than in rigidity propellers. Their maximum changes can reach 7.2% and 9.9%, respectively. The aeroelasticity effect does not substantially affect the propulsion efficiency. Hence, the aeroelasticity effect has a greater impact on the propulsion performance when the propeller is under high thrust and low speed conditions. It can increase the thrust while basically maintaining the original efficiency.

Key words: radial point interpolation method (RPIM), aeroelasticity, flexible propeller, Delaunay mapping, computational fluid dynamics (CFD), computational solid dynamics (CSD)

CLC Number:

V211.3

ZHANG Yu, WANG Xiaoliang. Simulation on Aeroelasticity of Flexible Propellers Based onRadial Point Interpolation Method[J]. Journal of Shanghai Jiaotong University, 2020, 54(9): 924-934.

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边界名称	边界类型
Inlet	速度入口
Outlet	压力出口
Inter	交界面
Far-wall	静止壁面
PROP	移动壁面

网格等级	翼型弦向网格份数	展向网格份数	螺旋桨网格单元数	螺旋桨网格节点数
稀疏	11	21	441	748
粗糙	16	31	961	1568
中等	21	45	1845	2944
精细	31	51	3111	4888

插值方法	模块及对比项	F_x/kN	F_y/kN	F_z/kN	M_x/(kN·m)	M_y/(kN·m)	M_z/(kN·m)
RPIM	CFD	55.335	619.233	1.113	2734.119	215.784	1568.467
	CSD	55.335	619.233	1.113	2734.120	215.784	1568.467
	e_r/%	0	0	0	0	0	0
	t_c/s	20.03	20.03	20.03	20.03	20.03	20.03
RBF	CSD	47.290	400.419	-2.769	1698.473	179.547	1034.293
	e_r/%	-14.5	-35.3	-348.8	-37.9	-16.8	-34.1
	t_c/s	32.13	32.13	32.13	32.13	32.13	32.13