来流具有空间攻角的波浪型杆件绕流特性研究

STUDY ON FLOW CHARACTERISTICS OF WAVE-SHAPED RODS WITH SPATIAL ANGLE OF ATTACK

针对波浪型杆件,建立三种波长模型,通过大涡模拟方法在高雷诺数下对来流具有空间攻角的波浪型杆件绕流特性进行分析,研究了不同波长的波浪型杆件速度、压力分布规律,探讨了其周向压力系数、阻力、升力的时域和频域特性。结果表明:表面倾斜度越大,则表面压力变化越大;波长越小,杆件阻力系数的幅值及主要峰值的范围也大。结合绕流场特性,对比λ/D_(m)=5.5、λ/D_(m)=3.26及λ/D_(m)=2.24的波浪型杆件,当来流具有空间攻角时λ/D_(m)=3.26的波浪型杆件可以得到较好的减阻、减振效果。研究结果对有波浪型杆件绕流特性的研究及应用具有重要意义和价值。

For the wave cylinder,three wavelength models were established. The large eddy simulation method is used to analyze the flow characteristics of wave members with convection angle under high Reynolds number. The velocity and pressure distribution laws of wave members with different wavelengths were investigated,and characteristics about time-domain and frequency-domain of the circumferential pressure coefficient,drag and lift were discussed. The results show that the larger the surface inclination,the higher the surface pressure variation. The smaller the wavelength is,the larger the resistivity of the member and the main peak ranges. According to the characteristics of flow fields,a wave member with a spatial AOA of λ/D_(m)=3. 26 obtains better drag and vibration reductions,compared λ/D_(m)= 5. 5,λ/D_(m)= 3. 26 and λ/D_(m)= 2. 24. These findings are vitally significant and valuable for researches and applications about flow characteristics of wave cylinder.