振荡流场中近底水平圆柱升力研究

Experimental Investigation of Lift Forces on the New-Bottom Horizontal Cylinder in the Oscillating Flow Field

在利用傅氏级数法模拟波、流场中水平圆柱上的升力时，其傅氏系数及初相位的选取是问题的关键。本文进行了近底水平圆柱在振荡流场中的物理模型实验，采用傅氏级数法推求各参数，得到不同Ｋｃ数及间隙比（ｅ／Ｄ）情况下的各种参数值．实验要素范围 Ｋｃ数为５～２０， Ｒｅ数为２ ５００～１００００，间隙比为０．１～１．０．

The lift forces on the near-bottom horizontal cylinder are experimentally investigated with Reynolds numbers,(Re ) in the range 2 500~ 10 000 and Keulegan^Carpenter numbers Kc) in the interval from.1 5 to 20, and gap ratio (e/D ) from 0.2 to 1.0, lift force coefficient (CL ) The deviation values of lift forces (a0 ) are analyzed by using the Fourier analysis method. It is found that both CL & a0 are the functions of the Kc number.