【作者】 熊鹰；

【导师】 王德恂；

【作者基本信息】 武汉理工大学 ， 流体力学， 2002， 博士

【摘要】 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。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。通过对各种类型螺旋桨的校核计算，表明本文提出的计算程序在螺旋桨敞水性能、非定常力、桨叶表面压力分布等方面均能取得令人满意的计算结果。 本文叙述了应用面元法确定非定常螺旋桨局部空泡、超空泡的范围和体积的计算公式和数值求解方法，在国内首次应用面元法预报了螺旋桨非定常空泡的范围和体积。为了提高求解效率，本文在确定螺旋桨桨叶上空泡范围时采用的求解方法是针对每一个弦向“条带”进行的，“条带”之间的相互影响通过沿桨叶展向的迭代考虑。求解过程中待求的空泡源强始终布置在桨叶表面上，而在根据动力学条件求解每一步的空泡面元偶极子强度时，积分是沿着上一步迭代确定的空泡表面进行的。应用本文计算方法确定的螺旋桨空泡范围经与空泡水洞中的空泡图象观察结果比较，证明了该方法的可行性。 目前，螺旋桨诱导的船体表面脉动压力的理论预报方法，大多是以无限流场中点脉动源诱导的周围流场的脉动压力的计算方法为基础的，本文采用该方法编制了计算程序，可以分别考虑桨叶厚度、桨叶负荷、桨叶上空泡厚度及其体积变化在船体表面指定位置上产生的脉动压力。经与空泡水洞中螺旋桨模型脉动压力测试结果比较，表明本文的计算程序可以用于工程实际。 在脉动压力的模型测试研究方面，本文在水动力学国家重点实验室基金项目的资助下，对在减压拖曳水池中利用自航模进行空泡螺旋桨诱导的脉动压力的测试方法进行了研究。比较了不同测试设备用于螺旋桨脉动压力测试的优缺点，探讨了在减压拖曳水池中实现实船自航点的方法，并进行了两只螺旋桨模型的脉动压力测试，经与空泡水洞中脉动压力的测试结果进行比较，说明该项测试是成功的，同时也对脉动压力的理论预报结果做了验证。 本文从理论计算和模型试验两个方面系统地研究了不均匀流场中螺旋桨空泡诱导的船体表面脉动压力的预报问题，建立了一套完整的预报非定常空泡螺旋桨诱导的船体表面脉动压力的方法和程序，并在国内首次完成了在减压拖曳水池中进行空泡螺旋桨诱导的船体表面脉动压力测试。更多还原

【Abstract】 This paper has adopted the low-order surface panel method based on velocity potential to predict the unsteady performance of propeller. 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. Through the verification calculations on various types of propeller, the numerical method and computer program presented in this paper can give a satisfied result of open water performance of propeller, unsteady forces, pressure distribution of blade surface.This paper has presented the calculation formula and numerical solution methods to determine the range and volume of partially cavity, supercavity by using surface panel method, and has predicted the range and volume of unsteady cavitation of propeller by using surface panel method for the first time inland. To improve the efficiency of solution, the solution method to determine the cavitation range of blade is carried out for each chordwise string, the interaction between strings is included by spanwise iterative procedure. The unknown source strength of cavitation is always arranged on the propeller blade surface in the solving process, but the integration is carried out along the cavity surface of last iterative step when the strength of cavitation dipole is determined according to dynamic condition. The propeller cavitation range determined by calculation method presented in this paper agrees with the observation result of cavity image at cavitation tunnel very well, which proves the practicability of this method.Presently most of the theoretical method to predict the propeller-induced hull pressure fluctuation is based on the calculation method in which the pressure is induced by pulsating source in infinite flow. The calculation method is adopted and the corresponded computer program is complied. The propeller-induced hull pressure fluctuation due to blade thickness, blade load, cavity thickness and the change of the cavity volume can be analyzed respectively in the computer program. The better agreement between the calculated value and the measurement result of propeller-induced hull pressure fluctuation proves that the program in this paper can be suitable for engineering application.With the fund item sponsored by the National Laboratory of Hydrodynamics, the study on measurement method of propeller-induced pressure with using self-propulsion model has been carried out in depressurized towing tank. The advantage and disadvantage of measurement of propeller-induced pressure by using different equipment is discussed. The method to obtain self-propulsion point for full scale in depressurized towing tank is studied. The measurements of pressure of two propeller models are carried out, the results of the measurement agree with those obtained by cavitation tunnel very well, which proves this measurement is successful, and the theoretical prediction is verified too.The prediction of propeller-induced hull pressure fluctuation in non-uniform flow is studied by using theoretical calculation and model experiment systematically. An intact method and computer program for the prediction of unsteady cavitating propeller-induced hull pressure fluctuation in non-uniform flow is set up in this paper. The measurement of propeller induced hull pressure fluctuation in depressurized towing tank carried out in this paper is the first time inland.更多还原