三维短翼的水动力性能计算研究

针对以速度势为基本变量的船舶螺旋桨面元理论在计算小展弦比三维短翼的水动力性能精度较差的实际情况,考虑自翼梢面元泄出的自由涡,利用简捷的关于扰动速度势的基本积分方程并结合Morino数值库塔条件、压力库塔条件,建立了考虑自翼梢面元泄出的自由涡的三维短翼水动力数值计算模型,以达到提高三维短翼水动力计算精度的目的.为避免在物面上数值求导,用Yanagizawa方法求得物面上的速度分布并通过Bernoulli方程计算三维短翼的压力分布,以此计算三维短翼的升力系数等宏观量.数值分析表明该模型是有效的.进一步考虑涡的衰减,可较好的模拟翼后的流场.

Research on the hydrodynamic performance of the 3-D wing

Because of the poor precision of ship propeller panel theory in calculating hydrodynamics of a 3-D short wing with velocity potential as a basic variable,a hydrodynamic numerical calculating model is established,in which free vortex shedding from the wing tip is taken into account,and the basic integral equation for disturbing velocity potential is employed in combination with Monino's numerical Kutta condition and the pressure Kutta condition.The proposed model improves calculating precision.In order to avoid the computation of numerical derivatives on the propeller's plane,this paper uses the method developed by Yanagizawa to determine velocities on the propeller surface and gets the pressure distribution of a 3-D short wing through the Bernoulli equation.Numerical analysis proves that this model is effective.If the attenuation of vortexes is introduced,,this model can be employed to better simulate the field behind the wing.