非均匀来流中全方向推进器非定常水动力性能的研究

为进行安装全方向推进器的潜器运动仿真,研究了非均匀来流中全方向推进器水动力性能的面元预报方法,预报了不同轴向非均匀来流情况下全方向推进器水动力性能.基于螺旋桨面元法理论建立了非均匀来流中全方向推进器水动力性能计算的数学模型,对非均匀来流中全方向推进器的非定常水动力性能进行了数值预报.采用了关于扰动速度势的基本积分微分方程;并且采用双曲面元以消除面元间的缝隙,在桨叶随边满足压力库塔条件.在计算面元的影响系数时,应用了Morino导出的解析公式.为避免数值求导中的奇异性,用Yanagizawa方法求得物体表面上的速度分布.预报了非均匀来流中全方向推进器的非定常水动力性能,并与均匀来流中全方向推进器的非定常水动力性能作了对比.计算结果表明在某些轴向非均匀来流情况下,全方向推进器水动力性能要好于轴向均匀来流时的水动力性能.

Research on unsteady hydrodynamic behaviors of a variable vector propeller in uneven in-flow

The panel method is employed for predicting the unsteady hydrodynamic characteristics of a variable vector propeller(VPP) in uneven in-flow.A mathematical model was established to make a numerical prediction of unsteady hydrodynamic behaviors.The gaps between panels were eliminated using hyperboloidal quadrilateral panels and basic integro-differential equation related to perturbance velocity potential.The trailing edges of the propeller satisfies the Kutta pressure condition.The influence coefficients of panels were evaluated by using Morino formula.Finally,the velocity distribution was calculated with Yanagizawa method to eliminate the singularity caused by numerical differential.Comparisons between calculated results for different uneven in-flow distributions and even in-flow distributions showed that the unsteady performance of a VVP in some uneven in-flow distributions is better than that in even in-flow distributions.