| 1. | Nonconstancy of variability
变异的非定常性 |
| 2. | This paper has adopted the low - order surface panel method based on velocity potential to predict the unsteady performance of propeller
本文采用基于速度势的低阶面元法进行螺旋桨非定常性能的预报。 |
| 3. | The harmonic analysis and the panel method have been used to predict the unsteady performance of propeller . this computer program has been developed
用谐调分析方法把面元法巧妙地应用于螺旋桨非定常性能预报，并开发了计算程序。 |
| 4. | Zhang jian - hua , wang guo - qiang . prediction of hydrodynamic performances of ducted controllable pitch propellers [ j ] . journal of ship mechanics , 2002 , 6 ( 6 ) ( accepted )
王国强,胡寿根.螺旋桨非定常性能计算的升力面方法[ j ] .上海交通大学学报, 1989 ( 3 ) |
| 5. | Unsteadiness is an essential attribute of the flow in turbomachinery . the related work has been one of the major problems in the research of turbomachinery aerodynamics , and has focused much attention of scholars for many years
非定常性是叶轮机械内流动的本质属性，对叶轮机械非定常流动的研究是近年来叶轮机械气动热力学领域里的难点和热点之一。 |
| 6. | The computer program has following advantage : the solution of main blade is by iterative scheme in time domain , the kutta condition is used by explicit equal pressure condition , the jacobian matrix which can reflect the influence on the difference between the upper and lower surface at trailing edge by dipole is calculated in each iterative procedure , in order to improve the convergence of iteration
本文编制的螺旋桨非定常性能预报程序是针对主叶在时域中迭代求解的， kutta条件采用的是显式的等压条件，求解中为了提高迭代的收敛性，在每次迭代中都重新计算反映偶极子强度对尾缘处上下表面压力差影响的jacobi矩阵。 |
| 7. | Based on the green ' s formula and the assumption of the propeller blade ' s thin sections , a lifting - surface method of propellers with the vortex lattice and equal source panel distributions on the mean camber surface has been introduced for the prediction of steady propeller ' s hydrodynamics in this paper . an approximate kurta condition was applied
基于creen公式和薄翼理论假设导出的升力面方法，采用在螺旋桨拱弧面上分布离散涡、源布置方法预报均匀流场中的螺旋桨的定常性能，螺旋桨尾涡面上压力连续性条件采用近似的kutta条件处理。 |
| 8. | The lifting - line and lifting - surface design method , the harmonic analysis method based on the panel method , new section design ways , the effective operating curves are integrated into a whole design system of the unsteady propeller , the design system is effective and reliable by the design example , the model test and the application to the full scale ship
本文把升力线和升力面设计方法、基于面元法预报螺旋桨非定常性能的谐调分析方法，新剖面设计方法、有效运转曲线计算方法组合为一套完整的非均匀流场中螺旋桨设计计算系统，经实例设计和模型试验及实船的应用，该设计系统是可靠且有效的。 |
| 9. | So the model is more integral and accurate in describing the performance of heat and mass transfer in the adsorbent bed than the traditional mathematical model . 4 . pens ( perturbational exponential numerical scheme ) is adopted to ensure the successful solving of the mathematical model and the reliability of results
采用摄动精确数值解格式( pens )来求解数学模型中的主要控制方程，并且考虑到控制方程的非定常性，对原pens格式进行了非定常变换，保证了数学模型计算的成功和结果的可靠性。 |
