Two types of nozzles at the shroud
3.2. The radial inflow cavity model with tubed vortex reducer
The structure and main geometric sizes of the cavity are shown in Fig. 4. The gap ratio (S/Ra) is 0.25 and the non-dimensional radius of vortex reducer (R3/Ra) is 0.85. In addition, it CH5183284 (Debio-1347) should be noted that the co-rotating discs are made of steel C45.
Fig. 4. The structure and main geometric sizes of the cavity.Figure optionsDownload full-size imageDownload as PowerPoint slide
3.3. Nozzle and vortex reducer geometries
For the present research, the pressure losses of the cavity with 15 tubed vortex reducers are inversion studied by an experimental method. Across the vanes, the air travels into the cavity via 15 nozzles, circumferentially and uniformly arranged at the shroud. With the tubed vortex reducers in the cavity, the air has to flow radially into the tubes and finally exit axially along the shaft. Nozzles of different shapes and tubed vortex reducers of different lengths will be shown in the following sections.