037800

Figure 11. Total temperature contours at axial stations from just downstream of the hub leakage flow location to mid-chord in the blade passage, illustrating the migration of the leakage flow through the 1st blade. Figure 11 is a scries of plots, viewed from upstream, showing total temperature contours at axial stations through the rotor. Figure 12 includes two plots viewed from downstream which also show total temperature contours at axial stations near the trailing edge of the blade and at the exit of the blade H-grid. The six contour plots in Figures 11 and 12 should be viewed as part of a single series. Together, figures 11 and 12 show the downstream convection and radial migration of the cavity flow. The flow features in figures 7 and 8 are helpful in explaining the migration of the core of leakage flow from the hub at the interstage axial location to 40% span by the exit of the rotor. This migration was determined for the most part by the physics of the flow through the rotor. As the passage flow entered the rotor passage, the flow near the pressure surface of the rotor was forced radially toward the endwalls. As a consequence of the secondary flow, fluid near the hub was driven across the passage to the suction side of the adjacent blade. Near the suction surface, the flow was forced radially toward inidspan. The leakage flow was split at the leading

Figure 11. Total temperature contours at axial stations from just downstream of the hub leakage flow location to mid-chord in the blade passage, illustrating the migration of the leakage flow through the 1st blade. Figure 11 is a scries of plots, viewed from upstream, showing total temperature contours at axial stations through the rotor. Figure 12 includes two plots viewed from downstream which also show total temperature contours at axial stations near the trailing edge of the blade and at the exit of the blade H-grid. The six contour plots in Figures 11 and 12 should be viewed as part of a single series. Together, figures 11 and 12 show the downstream convection and radial migration of the cavity flow. The flow features in figures 7 and 8 are helpful in explaining the migration of the core of leakage flow from the hub at the interstage axial location to 40% span by the exit of the rotor. This migration was determined for the most part by the physics of the flow through the rotor. As the passage flow entered the rotor passage, the flow near the pressure surface of the rotor was forced radially toward the endwalls. As a consequence of the secondary flow, fluid near the hub was driven across the passage to the suction side of the adjacent blade. Near the suction surface, the flow was forced radially toward inidspan. The leakage flow was split at the leading

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