Home – Home – Jornals – Thermophysics and Aeromechanics 2004 number 2

The effect of the choice in central jet feeding method and radial displacement of the outlet opening on gas dynamic and turbulent characteristics of gas flow in a vortex chamber was studied experimentally. The two-component laser Doppler anemometer was used in experiments. The flow rotation axis follows the displacement of the axis for outlet diaphragm. While that, the maximum of circumferential velocity decreases as the outlet opening is shifted away from the chamber axis. For a high shift, the flow swirling decreases drastically. The maximum of longitudinal velocity always remains in the near-axis zone of chamber and almost independent of the radial shift of exhaust diaphragm. Application of different techniques for feeding of an axial no swirling jet demonstrated that the average profiles of axial and circumferential velocities are self-similar. The changes in turbulence degree evidenced about qualitative resemblance of Tu distributions for all considered options for axial jet. The result is that a positive radial gradient of circulation in the middle area suppresses the turbulence as the flow travels from the inlet to the outlet. The measurement results for average velocity and turbulence degree in the face-end boundary layer are presented.