基于流固耦合的微型柔性翼气动力特性研究
发布时间：2018-08-05 14:04
【摘要】：微型飞行器具有隐蔽小巧与机动性高等特点,因而存在极高的军事价值。常规的气动布局会使微型飞行器产生气动力不足和稳定性差等问题,而相同尺寸的飞行生物则不存在这些问题,从而仿生的微型飞行器成为了学者们在该领域的研究热点。由于生物飞行具有低流场雷诺数、复杂拍动和可变形翼等特点,因此针对低流场雷诺数流场下的微型柔性翼空气动力特性研究具有较大的意义。本文基于双向迭代流固耦合算法,利用ANSYS Workbench中的Mechanical和Fluent模块建立了针对微型柔性翼的双向流固耦合数值计算方法。在此基础上,针对低流场雷诺数流场中的微型柔性翼进行了流固耦合数值模拟研究。主要的研究内容和成果如下:针对微型柔性翼进行了滑翔状态下的数值模拟研究,得到了微型柔性翼在滑翔状态下的结构振动位移和气动力系数随时间的变化规律,进一步针对结构振动位移和气动力系数进行了幅频特性分析,并研究了微型柔性翼刚度和流场雷诺数对结构振动特性、气动力特性和流场特性的影响。针对处于拍动状态下的微型柔性翼开展了数值模拟研究,得到了一个拍动周期内悬停拍动和前飞拍动微型柔性翼的气动力系数随时间的变化规律,结合拍动流场对比分析了悬停拍动和前飞拍动升阻力系数峰值和波动的成因。并分析了微型柔性翼刚度和拍动频率对悬停拍动状态的气动力特性和流场特性的影响。
[Abstract]:Because of its small concealment and high maneuverability, micro-aircraft has high military value. The conventional aerodynamic layout will lead to the problems of poor aerodynamic force and poor stability, but the same size of flying organisms do not exist these problems, so biomimetic micro air vehicle has become the research hotspot in this field. Because biological flight has the characteristics of low Reynolds number complex flapping and deformable wing it is of great significance to study the aerodynamic characteristics of micro flexible wing in low Reynolds number flow field. Based on the bidirectional iterative fluid-solid coupling algorithm, a bidirectional fluid-structure coupling numerical method for micro flexible wing is established by using the Mechanical and Fluent modules in ANSYS Workbench. On this basis, the fluid-solid coupling numerical simulation of the micro flexible wing in the low Reynolds number flow field is carried out. The main research contents and results are as follows: the numerical simulation of the micro flexible wing in gliding state is carried out, and the variation of vibration displacement and aerodynamic coefficient of the micro flexible wing with time is obtained. Furthermore, the amplitude-frequency characteristics of the structural vibration displacement and aerodynamic coefficients are analyzed, and the effects of the stiffness of the micro flexible wing and the Reynolds number of the flow field on the vibration characteristics, aerodynamic characteristics and flow field characteristics of the structure are studied. A numerical simulation study was carried out on a micro flexible wing in a flapping state. The aerodynamic coefficients of the micro flexible wing with hovering and forward flapping during a flapping period were obtained. The causes of the peak value and fluctuation of hovering flapping and forward flapping resistance coefficient are analyzed in combination with the flapping flow field. The effects of the stiffness and flapping frequency of the micro flexible wing on the aerodynamic characteristics and the flow field characteristics of the hovering flapping state are analyzed.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：V224
，
本文编号：2166016
[Abstract]:Because of its small concealment and high maneuverability, micro-aircraft has high military value. The conventional aerodynamic layout will lead to the problems of poor aerodynamic force and poor stability, but the same size of flying organisms do not exist these problems, so biomimetic micro air vehicle has become the research hotspot in this field. Because biological flight has the characteristics of low Reynolds number complex flapping and deformable wing it is of great significance to study the aerodynamic characteristics of micro flexible wing in low Reynolds number flow field. Based on the bidirectional iterative fluid-solid coupling algorithm, a bidirectional fluid-structure coupling numerical method for micro flexible wing is established by using the Mechanical and Fluent modules in ANSYS Workbench. On this basis, the fluid-solid coupling numerical simulation of the micro flexible wing in the low Reynolds number flow field is carried out. The main research contents and results are as follows: the numerical simulation of the micro flexible wing in gliding state is carried out, and the variation of vibration displacement and aerodynamic coefficient of the micro flexible wing with time is obtained. Furthermore, the amplitude-frequency characteristics of the structural vibration displacement and aerodynamic coefficients are analyzed, and the effects of the stiffness of the micro flexible wing and the Reynolds number of the flow field on the vibration characteristics, aerodynamic characteristics and flow field characteristics of the structure are studied. A numerical simulation study was carried out on a micro flexible wing in a flapping state. The aerodynamic coefficients of the micro flexible wing with hovering and forward flapping during a flapping period were obtained. The causes of the peak value and fluctuation of hovering flapping and forward flapping resistance coefficient are analyzed in combination with the flapping flow field. The effects of the stiffness and flapping frequency of the micro flexible wing on the aerodynamic characteristics and the flow field characteristics of the hovering flapping state are analyzed.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：V224
，
本文编号：2166016
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