| Abstract: | Three-dimensional characteristics of turbulent flow in the tip region was studied usinga 3-D Laser Doppler Velocimetry inside an axial--flow low--speed large-scale single--stagecompressor rotor passage. The flow was survey6d across the entire passage at fifteen axiallocations (leading edge to trailing edge) and twelve radial locations (0.985, 0.980, 0.975,0.950, 0.925, 0.900, 0.875, 0.850, 0.813, 0.775, 0.738, 0.700 span). This paper presellts thevariations of axial, tangential and radial turbulence intensity and stresses in design condition.The measurement results indicated that, the strong interaction of the tip leakage vortex, theannulus wall boundary layer and the main flow produces high turbulence, which developswith the leakage vortex, and the radial turbulence intensity was found to be the largest whilethe axial--radial Reynolds stress is the largest. The presence of the highest level of turbulenceimmensities at 1/3 chord indicates the strongest flow mixing nearby. Bursting of the leakagevortex makes the flow more turbulent in the larger region downstream. The corner vortexcontributes to the high turbulence level at the corner between the casing and the suctionsurface. |
