CAJ | 학술논문

为研究鳍的影响,建立了吊舱推进器的水动力性能的计算模型.计算了吊舱推进器安装和不安装鳍时的水动力性能,螺旋桨与吊舱及鳍之间的相互影响通过迭代计算加以考虑.采用基于速度势的基本积分微分方程,并采用双曲面元以消除面元间的间隙.采用Newton-Raphson迭代求解压力分布使得桨叶的随边满足压力库塔条件,用柳泽的方法求得物体表面的速度分布以避免数值求导的奇异性.无鳍.单鳍和双鳍的吊舱推进器水动力性能计算结果表明,附加鳍时吊舱推进器的螺旋桨推力增加,由于鳍上产生推力导致吊舱阻力减小.附加双鳍时的吊舱推进器水动力性能最好,附加单鳍时次之,无鳍时最低.
위연구기적영향,건립료조창추진기적수동력성능적계산모형.계산료조창추진기안장화불안장기시적수동력성능,라선장여조창급기지간적상호영향통과질대계산가이고필.채용기우속도세적기본적분미분방정,병채용쌍곡면원이소제면원간적간극.채용Newton-Raphson질대구해압력분포사득장협적수변만족압력고탑조건,용류택적방법구득물체표면적속도분포이피면수치구도적기이성.무기.단기화쌍기적조창추진기수동력성능계산결과표명,부가기시조창추진기적라선장추력증가,유우기상산생추력도치조창조력감소.부가쌍기시적조창추진기수동력성능최호,부가단기시차지,무기시최저.
A mathematical model of podded propulsors was established in order to investigate the influence of fins. The hydrodynamic performance of podded propulsors with and without fins was calculated, with interactions between propellers and pods and fins derived by iterative calculation. The differential equation based on velocity potential was adopted and hyperboloidal panels were used to avoid gaps between surface panels. The Newton-Raphson iterative procedure was used on the trailing edge to meet the pressure Kutta condition. The velocity distribution was calculated with the Yanagizawa method to eliminate the singularity caused by use of the numerical differential. Comparisons of the performance of podded propulsors with different fins showed that the thrust of propeller in a podded propulsor with fins is greater. The resistance of the pod is also reduced because of the thrust of the fin. The hydrodynamic performance of a podded propulsor with two fins is found to be best, the performance of a podded propulsor with one fin is not as good as two fins, and the performance of the common type is the worst.