复杂环境翼伞气动性能建模仿真研究
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摘要
翼伞飞行环境复杂多变,常存在阵风与降雨干扰,对翼伞气动性能产生动态影响,造成系统失衡。传统模型忽视翼伞力矩失衡产生的俯仰运动,分析结果误差较大。针对时刻变化的流场环境与翼伞姿态,可借助CFD软件,通过网格速度模拟阵风、离散相模拟降雨、动网格模拟俯仰运动,对非定常Euler方程空间离散求解,得到阵风与降雨对翼伞气动性能的单独影响与耦合影响。利用修正后的翼伞模型进行仿真,结果表明,上述模型能较好描述翼伞气动性能在复杂环境中的变化规律,为翼伞精确建模与归航优化控制提供了参考。
The dynamic effect of parafoil aerodynamic performance is caused by gust and rainfall in the complex and changeable flying environment.While the error of analysis result is large with the ignorance of pitch motion caused by torque imbalance in traditional parafoil modeling.For the changes of flow field environment and parafoil attitude,the unsteady Euler equation is solved by space dispersion with gust simulated by mesh velocity,rainfall simulated by discrete phase and pitch motion simulated by dynamic mesh in CFD technology,witch provides the separate and coupling effect of gust and rainfall on parafoil aerodynamic performance.The regulation of parafoil aerodynamic performance in complex environment is described by modified parafoil model,witch provides the reference for precise modeling and homing control of parafoil.
The dynamic effect of parafoil aerodynamic performance is caused by gust and rainfall in the complex and changeable flying environment.While the error of analysis result is large with the ignorance of pitch motion caused by torque imbalance in traditional parafoil modeling.For the changes of flow field environment and parafoil attitude,the unsteady Euler equation is solved by space dispersion with gust simulated by mesh velocity,rainfall simulated by discrete phase and pitch motion simulated by dynamic mesh in CFD technology,witch provides the separate and coupling effect of gust and rainfall on parafoil aerodynamic performance.The regulation of parafoil aerodynamic performance in complex environment is described by modified parafoil model,witch provides the reference for precise modeling and homing control of parafoil.
引文
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[16]张云彩,等.阵风及其谱模拟[J].海洋工程,1996,(2):21—28.
[17]刘庆宽,乔富贵,杜彦良.降雨对基本构件气动特性影响的初步研究[J].石家庄铁道大学学报(自然科学版),2007,20(4):14—18.
[18]赵林,等.风雨耦合环境结构荷载与响应的分析及试验研究[J].振动工程学报,2014,27(4):507—517.
[2]R Singh,J D Baeder.Direct Calculation of Three-Dimensional Indicial Lift Response Using Computational Fluid Dynamics[J].Journal of Aircraft,2012,34(4):465-471.
[3]詹浩,钱炜祺.弹性机翼阵风响应数值计算方法[J].计算力学学报,2009,26(2):270-275.
[4]张昊,陈自力.基于动网格技术的动力伞阵风响应研究[J].计算机仿真,2012,29(11):117—121.
[5]陈洁钰,张昊.动力伞伞翼阵风响应的数值模拟[J].测控技术,2014,33(1):79—82.
[6]许晓平,张艳敬.基于CFD方法的机翼阵风响应研究[J].飞机设计,2011,31(2):20—24.
[7]J D Nicolaidea.Parafoil wind tunnel tests[R].AD731564.Indiana:University of Notre Dame,1971.
[8]焦亮,孙青林,亢晓峰.翼伞空投机器人系统的六自由度仿真[J].计算机仿真,2011,28(1):39—42.
[9]朱旭,曹义华.翼伞弧面下反角,翼型和前缘切口对翼伞气动性能的影响[J].航空学报,2012,33(7):1189—1200.
[10]熊菁.翼伞系统动力学与归航方案研究[D].国防科学技术大学,2005:35—37.
[11]李扬,夏刚,秦子增.基于预处理方法的冲压式翼伞非定常气动特性数值研究[J].航天返回与遥感,2004,25(2):1—4.
[12]朱自强.应用计算流体力学[M].北京:北京航空航天大学出版社,1998:31—32.
[13]张云彩,等.阵风及其谱模拟[J].海洋工程,1996,(2):21—28.
[14]王福军.计算流体动力学分析:CFD软件原理与应用[M].北京:清华大学出版社,2004:124—125.
[15]L Tang,et al.Numerical investigation of transonic limit cycle oscillations of a two-dimensional supercritical wing[J].Journal of Fluids&Structures,2003,17(2):29-41.
[16]张云彩,等.阵风及其谱模拟[J].海洋工程,1996,(2):21—28.
[17]刘庆宽,乔富贵,杜彦良.降雨对基本构件气动特性影响的初步研究[J].石家庄铁道大学学报(自然科学版),2007,20(4):14—18.
[18]赵林,等.风雨耦合环境结构荷载与响应的分析及试验研究[J].振动工程学报,2014,27(4):507—517.