【作者】 杨阳；

【导师】 李明水；

【作者基本信息】 西南交通大学 ， 结构工程， 2019， 博士

【摘要】 论文回顾了气动导纳的研究历程,概述了气动导纳的研究现状及进展,指出了当前研究中存在的不足,采用理论和试验相结合的方法,对翼型和矩形的气动导纳进行了详细的研究。本文的主要内容有:1.回顾了翼型抖振力及气动导纳的理论研究历程,概述了翼型和钝体气动导纳的试验研究现状及进展,归纳了一波数气动导纳、两波数气动导纳及三维气动导纳的特点;2.基于三维理论描述了紊流中无限翼展机翼的抖振力,导出了抖振力展向相干函数的一般形式,研究了控制三维效应重要性的参数,分析了紊流积分尺度与宽度之比、结构展长与宽度之比在抖振力计算中的作用,拓展了片条假设的适用条件,提出了紊流中直接识别一波数气动导纳的方法,确认了片条假设用于线状结构抖振分析的有效性,通过引入气动导纳修正项经验模型,将三维抖振力分析方法推广至钝体;3.在格栅和尖塔产生的均匀紊流中采用测压试验测量了NACA 0015翼型及五种不同宽高比矩形断面的气动导纳,分析了翼型和矩形断面的表面压力分布特性,利用抖振力展向相干函数确定了翼型和矩形断面的气动导纳修正项,识别了NACA 0015翼型和矩形断面的一波数气动导纳,提出了矩形断面一波数气动导纳经验公式;4.采用测力试验测量了三种不同展宽比NACA 0015翼型及一种展宽比5:1矩形断面的一波数气动导纳,验证了紊流中直接识别一波数气动导纳方法的有效性,讨论了测压法与测力法的一致性。更多还原

【Abstract】 The research history of the aerodynamic admittance has been reviewed,the status and the progress of the research on the aerodynamic admittance have been summarized,the shortcomings in the current research have been pointed out.Combining the theoretical analysis and the experimental research,the aerodynamic admittances of the airfoil and the rectangular cross-section are studied in detail.The main contents of the paper are as follows:1.The research history of the buffeting force and the aerodynamic admittance of the airfoil are reviewed.The status and progresses of the research on the aerodynamic admittance of rectangular cross-section are summarized.The characteristics of the one-wavenumber aerodynamic admittance,the two-wavenumber aerodynamic admittance as well as the three-dimensional aerodynamic admittance are concluded.2.The buffeting force on an infinite wing in turbulent flow is described based on the three-dimensional theory.A general form of the spanwise coherence function of the buffeting force is derived.The parameters that control the importance of the three-dimensional effects are investigated.The role of the ratio of the turbulence integral scale to the width and the ratio of the spanwise length to the width in the calculation of the buffeting force are analyzed.This expands the conditions for the strip assumption to apply.A direct measurement approach of the one-wavenumber aerodynamic admittance in turbulent flow is presented.The validity of the strip assumption used in the buffeting analysis of the line-likestructure is verified.By introducing the empirical model of the correction term of the aerodynamic admittance,the three-dimensional buffeting force analysis is generalized to the bluff body.3.By the use of the pressure measurement,the aerodynamic admittances of a NACA 0015 airfoil and rectangular cross-sections of five different width to depth ratios are measured in homogeneous turbulence generated by grids and spires.The characteristics of the surface pressure distribution on these models are analyzed.Using the general form of the spanwise coherence function of the buffeting force,the aerodynamic admittance correction terms of the airfoil and the rectangular cross-section are determined.The one-wavenumber aerodynamic admittances of the NACA 0015 airfoil and the rectangular cross-section are identified.The empirical formula for the one-wavenumber aerodynamic admittance of the rectangular cross-section is proposed.4.By the use of the force measurement,the aerodynamic admittances of the NACA 0015 airfoil with three different aspect-ratios and the 5:1 rectangular cross-section with one aspect-ratio are measured.The validity of the direct measurement approach of the one-wavenumber aerodynamic admittance in turbulent flow is verified.The consistency between the force measurement and the pressure measurement is discussed.更多还原