摘要
本文用k-ε两方程模型和激光多普勒测速仪研究了大曲率、小高宽比弯道内的湍流流动。实测发现湍流存在强烈的各向异性,最大时均速度u_(max)在25°截面后随θ角增大向外壁移动。计算发现用k-ε模型得到的时均速度u的结果与实验比较,在45°截面前,二者符合得很好,此后,存在较大误差。
The results of Laser-Doppler measurement are reported for turbulent flow in curved duct with large curvature and small haight-width ratio. The measurements show that the anisotropy of turbulent flow in the duct is very strong and the locus of maximum mean velocity umax moves to the outer wall with the increase of angle θ after 25°. The k-ε two-equation turbulence model is employed to calculate the mean velocity. The results agree satisfactorily with the experimental data before 45° and the errors are larger later.
出处
《空气动力学学报》
CSCD
北大核心
1990年第4期423-429,共7页
Acta Aerodynamica Sinica
关键词
湍流
弯道
激光测量
K-ε模型
:urbulent flow, curved duct, Laser-Doppler measurement, measurement, k-# turbulence model.
