Abstract
A turbulence chamber (0.78 × 0.23 × 2.59 m3) consisting of ten small electric heater/blowers with an aluminum foil screen and three screens of 2-mm aluminum wire meshes can generate the nearly homogeneous isotropic turbulence within the 0.5 × 0.05 × 2-m3 region at the 0.11-m height of optical measurements. The temperature structure constant squared was obtained from the temperature structure function measurements measured by using a differential microthermocouple system. The refractive-index structure constant squared at the 632.8-nm wavelength was calculated from . The average wind velocity and temperature were 0.41 m/sec and 53°C, respectively. From the power spectrum of temperature fluctuations, the inner and outer scales of turbulence are determined: l0 = 5.0 mm and L0 = 6.5 cm. The measured temperature structure function and power spectrum of temperature fluctuations satisfy the 2/3 and −5/3 power similarity laws in the inertial subrange, respectively.
© 1978 Optical Society of America
Full Article | PDF ArticleMore Like This
Arun K. Majumdar and Hideya Gamo
Appl. Opt. 21(12) 2229-2235 (1982)
Onur Keskin, Laurent Jolissaint, and Colin Bradley
Appl. Opt. 45(20) 4888-4897 (2006)
R. J. Hill and G. R. Ochs
Appl. Opt. 17(22) 3608-3612 (1978)