Acta Mechanica Sinica (Selected Articles)

Abstract : Based on the Navier Stokes equations, the compressible viscous vortex equation for decribing the separated vortex of an aircraft is derived and a numerical method suitable for subsonic, transonic and supersonic flows is given which can compute the characteristics of separated vortex or trailing vortex. The break-down condition of the compressible separated vortex is derived and used to compute the break-down point. A DISCUSION ON THE PRINCIPLE OF FLOW VELOCITY AND FLOW PATTERN MEASUREMENTS USING LASER SPECTRAL LINES. The principle of flow velocity and flow pattern measurements using Doppler-frequency shifted absorption (or emission) spectral lines as well as Doppler frequency shifted and deformational nonsaturated spectral line shapes is discussed. For the case of gas flow with simultaneously inhomogeneously and homogeneously broadened line, the general expressions of non-saturation spectral line-shaped and Doppler-frequency shifted spectral line are presented. (Chinese Translations).