摘要
以直立圆柱配合船池拖车完成单/双圆柱绕流对比实验教学。在单圆柱教学中,改变拖车航速,观察不同雷诺数下圆柱绕流现象,将圆柱绕流阻力无因次化后得到阻力系数,与理论值对比完成单圆柱绕流教学实验;在双圆柱绕流教学中,调节圆柱间距G范围为0.5~3.0倍直径,进行与单圆柱相同航速拖曳实验,观察双圆柱绕流的尾流场特征,测量圆柱阻力得出无因次阻力系数;对比单圆柱和不同间距双圆柱绕流的现象与阻力系数,完成等直径双圆柱不同间距下相互干扰情况的对比教学实验。本实验教学装置基于船模拖曳水池拖车系统设计,结构简单,实观现象明显,以单/双圆柱绕流实验开展对比教学可增进学生对知识体系的梳理,培养学生分析问题和解决问题的能力。
A comparison experiment teaching is conducted using a vertical cylinder with the towing tank trailer to complete the flow around a single/double cylinder(s).While the single-cylinder teaching experiment,the towing speed is changed,and students observe the flow around the cylinder under different Reynolds numbers.The flow resistance of the cylinder is measured to obtain the resistance coefficient,and compare it with the theoretical value,the single-cylinder flow teaching experiment is completed.While the teaching of the flow around two circular cylinders,the spacing between the cylinders G is adjusted to be 0.5~3 times the diameter,and a tow experiment is conducted at the same speed as the single cylinder.The characteristics of the wake field around the two circular cylinders are observed,and the non-dimensional drag coefficient is obtained by measuring the cylinder resistance.Students compare the flow phenomena and resistance coefficients of a single cylinder and two cylinders with different spacings,and complete a comparative teaching experiment on the interference between two cylinders with equal diameters and different spacings.This experimental teaching device is based on the towing tank with a simple structure and obvious teaching phenomenon.The comparison of single/double cylinder flow experiments can enhance students’understanding of the knowledge system and cultivate their ability to analyze and solve problems.
作者
宋磊
孙江龙
刘曾
李天匀
李宸
张治成
SONG Lei;SUN Jianglong;LIU Zeng;LI Tianyun;LI Chen;ZHANG Zhicheng(School of Naval Architecture and Ocean Engineering,Hubei Provincial Engineering Research Center of Data Techniques and Supporting Software for Ships,Hubei Key Laboratory of Naval Architecture&Ocean Engineering Hydrodynamics,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《实验室研究与探索》
CAS
北大核心
2023年第11期179-182,223,共5页
Research and Exploration In Laboratory
基金
国家自然科学基金面上项目(12072126)
教育部第二批新工科项目(E-ZNZZ20201214,E-TMJZSLHY20202120)
教育部产学合作协同育人项目(202002247032,202002039004)
华中科技大学教改项目(2019007,2022007)
华中科技大学实验技术研究项目(202314001)
关键词
圆柱绕流
实验教学
流体力学
cylindrical winding
experimental teaching
hydrodynamics
