Abstract
A new technology for formation of axisymmetric free jets with a long laminar region is presented in the work. Such jets are created by of a compact device and experimentally studied in the Reynolds number range from 2000 to 13000. The device is capable of creation a jet of 0.12 m diameter. Numerical simulations are conducted with the purpose to analyse the flow inside the device and its impact on the jet velocity profile. Also calculations are conducted in order to find a way for a jet laminar region prolongation. Based on the calculations, the device parameters are corrected and the jet laminar region length is magnified from the size of 5.5 to 6.5 jet diameters. Free jets with long initial laminar regions and the diameter more than 0.1 m are advantageous for detailed research of perturbation growth and transition to turbulence in round jets, and can also be used to organize air curtains in order to protect objects in medicine and high–accurate industries.
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