The unsteady sheet cavitation of podded propeller was predicted by using a surface panel method. The interaction between propeller and pod was treated with the iterative calculation of induced velocity potential, and ...The unsteady sheet cavitation of podded propeller was predicted by using a surface panel method. The interaction between propeller and pod was treated with the iterative calculation of induced velocity potential, and the method of induced velocity potential can save a great deal of storage and computation time compared to the method of induced velocity. The induced velocity potential of unit singularity on every pod panel to every key blade panel and of unit singularity on every key blade panel and its wake panel to every pod panel were calculated when the key blade is at every angle position. Based on the wake model of the conventional single propeller, a new wake model of podded propeller was constructed. The propeller is analyzed only on the key blade in order to save computation time and memory space. The method can be used to calculate the hydrodynamics performance and cavitation of propeller in uniform and non-uniform inflows. It can give the unsteady force and cavitation shape of propeller. The propeller cavitation range determined by the present method agrees with the observation results of cavity image given in cavitation tunnel well, and this proves the practicability of the method.展开更多
为了提高小型船艇的操作性能和环保性能,采用数字舵机和直流无刷电机设计一种小型吊舱式推进器,并在此基础上以锂电池组作为动力能源,结合DSP(digital signal processing)技术,开发相应的推进控制系统。样船测试结果表明:该小型全电艇...为了提高小型船艇的操作性能和环保性能,采用数字舵机和直流无刷电机设计一种小型吊舱式推进器,并在此基础上以锂电池组作为动力能源,结合DSP(digital signal processing)技术,开发相应的推进控制系统。样船测试结果表明:该小型全电艇动力总成系统能够满足船速、转向、续航能力等方面的性能要求,运行稳定。展开更多
基金Project supported by the Research Foundation of the Ministry of Education Key Laboratory of High Speed Ship Engineering(Grant No. HSSE0803).
文摘The unsteady sheet cavitation of podded propeller was predicted by using a surface panel method. The interaction between propeller and pod was treated with the iterative calculation of induced velocity potential, and the method of induced velocity potential can save a great deal of storage and computation time compared to the method of induced velocity. The induced velocity potential of unit singularity on every pod panel to every key blade panel and of unit singularity on every key blade panel and its wake panel to every pod panel were calculated when the key blade is at every angle position. Based on the wake model of the conventional single propeller, a new wake model of podded propeller was constructed. The propeller is analyzed only on the key blade in order to save computation time and memory space. The method can be used to calculate the hydrodynamics performance and cavitation of propeller in uniform and non-uniform inflows. It can give the unsteady force and cavitation shape of propeller. The propeller cavitation range determined by the present method agrees with the observation results of cavity image given in cavitation tunnel well, and this proves the practicability of the method.
基金Supported by the Foundation of the State Key Laboratory of Ocean Engineering (No. 0811)by the Foundation of the Ministry of Education Key Laboratory of High Speed Ship Engineering (No. HSSE0803)
文摘为了提高小型船艇的操作性能和环保性能,采用数字舵机和直流无刷电机设计一种小型吊舱式推进器,并在此基础上以锂电池组作为动力能源,结合DSP(digital signal processing)技术,开发相应的推进控制系统。样船测试结果表明:该小型全电艇动力总成系统能够满足船速、转向、续航能力等方面的性能要求,运行稳定。
