Premium
Turbulent energy measurements by vanes
Author(s) -
Maccready P. B.,
Jex H. R.
Publication year - 1964
Publication title -
quarterly journal of the royal meteorological society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.744
H-Index - 143
eISSN - 1477-870X
pISSN - 0035-9009
DOI - 10.1002/qj.49709038410
Subject(s) - dissipation , turbulence , wavelength , attenuation , inertial frame of reference , eddy , variance (accounting) , mechanics , physics , energy (signal processing) , computational physics , optics , classical mechanics , thermodynamics , accounting , quantum mechanics , business
Utilizing the — 5/3 law spectrum for the inertial subrange of eddy sizes, it is shown that the indicated variance from a direction vane will be the same for an actual vane with a damping ratio of about 0·43 as for a vane with perfect response. For this damping ratio the addition to the variance by overshooting at wavelengths near the natural wavelength compensates for the loss by vane attenuation at shorter wavelengths. the relation between the variance for short sampling times, using such sensors, and ·, the dissipation rate, which represents a basic parameter for inertial subrange eddies, is derived. an airborne method of indicating · continuously is described.