基于自燃对流与三维平板大攻角绕流模型的纸螺旋动力扭矩研究  

RESEARCH ON DYNAMIC TORQUE OF PAPER SPIRAL BASED ON AUTOIGNITION CONVECTION AND 3D MODEL OF FLAT PLATE FLOW AT HIGH ANGLE OF ATTACK

作　　者：石嘉舜 刘振宇 周子翔 王凤龙 徐春龙[1] SHI Jiashun;LIU Zhenyu;ZHOU Zixiang;WANG Fenglong;XU Chunlong(College of Science,Chang'an University;College of Mechanical Engineering,Chang'an University,Xi'an,Shaanxi 710064)

机构地区：[1]长安大学理学院 [2]长安大学工程机械学院,陕西西安710064

出　　处：《物理与工程》2024年第4期183-190,198,共9页Physics and Engineering

基　　金：国家自然科学基金(52201103);陕西省自然科学基金(2021JQ-257);大学生创新创业训练计划(G202210710094,S202210710150);长安大学教学研究项目(BY202327)。

摘　　要：本文以蜡烛自燃空气对流与平板大攻角绕流为理论基础,对2022年青年物理学家锦标赛(IYPT2022)设计题“蜡烛动力涡旋机”(Candle Powered Turbine)针对性地开展了理论分析、实验研究和数值模拟分析。本文根据蜡烛燃烧的纹影法图像对蜡烛流场进行简化,建立了蜡烛自燃空气对流模型,并将平板大攻角绕流模型进行推广应用,得到了纸螺旋在蜡烛流场中所受扭矩的理论公式;通过实验探究了环带宽度、轴向倾角对纸螺旋扭矩的影响规律,并获得了最优化参数;对最优化装置进行了CFD数值仿真分析和实验研究,仿真结果和实验结果较好地吻合,验证了本文所提出的纸螺旋在蜡烛燃烧形成的空气对流场中运动的扭矩理论的准确性。本文的贡献是,把燃料燃烧形成的自然对流作为动力应用在旋转装置,对余能利用具有潜在的应用价值;三维平板大攻角绕流模型的建立为雷诺数在104~106范围内时三维平板类大攻角低速绕流的总压力计算提供了简便的计算方法。Based on the theory of air convection formed by candle burning and 3D model of flat-plate flow at high angle of attack,the relevant theoretical analysis,experimental exploration and numerical simulation analysis of the design topic“Candle Powered Turbine”at the 2022 International Young PhysicistsTournament are carried out in a targeted manner.Combined with the model of air convection formed by candle burning,and the three-dimensional model of flat-plate flow at high angle of attack is generalized and applied,the theoretical formula of the torque of the paper spiral in the flow field generated by candles is obtained.The influence of the width and the axial inclination angle of the paper tape on the torque of the pa-per spiral is explored through experiments,and the optimized parameters are obtained.CFD numerical simulation analysis and experimental research are carried out on the optimized de-vice.The simulation results are in good agreement with the experimental results,which con-firms the accuracy of the torque theory proposed in this paper for the motion of paper spirals in the air flow field formed by candle combustion.The natural convection formed by fuel com-bustion is used as the power source in the rotating device,which has potential application val-ue for the utilization of surplus energy.Moreover,the establishment of the 3D model of flat-plate flow at high angle of attack provides a simple calculation method for the total pressure calculation of the flow around a three-dimensional flat plate at a low speed at a high angle of attack with Reynolds number in the range of 104~106.

关 键 词：平板绕流 大攻角绕流 总压力 自然对流 

分 类 号：O357.5[理学—流体力学]