Fig. 1 Typical evolution of rotor thermal gradient during shutdown cooling More about this image found in Typical evolution of rotor thermal gradient during shutdown cooling

Fig. 2 Schematic of the RoBo experimental facility. θ is positive clockwise from top-dead-center. Square markers represent embedded thermocouples. More about this image found in Schematic of the RoBo experimental facility. θ is positive clockwise from...

Fig. 3 The RoBo facility More about this image found in The RoBo facility

Fig. 4 Four rows of blades installed in a partially assembled RoBo facility More about this image found in Four rows of blades installed in a partially assembled RoBo facility

Fig. 5 Top: schematic of the simulation domain that was used for ventilated cases. Bottom: section view of the mesh showing the vertical mid-plane, inner cylinder, and blade surface meshes. This was used for a case that included blades and ventilation. The outer cylinder mesh is not shown. More about this image found in Top: schematic of the simulation domain that was used for ventilated cases...

Fig. 6 Experimental (markers) and CFD (lines) radial temperature profiles for an unobstructed, sealed case. R a D i = 6.3 × 10 7 and Dr = 1.25. θ = 0 deg at TDC. More about this image found in Experimental (markers) and CFD (lines) radial temperature profiles for an u...

Fig. 7 Experimental (markers) and CFD (lines) radial temperature profiles for an unobstructed, ventilated case. R a D i = 6.3 × 10 7 and Dr = 1.25. θ = 0 deg at TDC. More about this image found in Experimental (markers) and CFD (lines) radial temperature profiles for an u...

Fig. 8 Convective heat flux measurements for a sealed and ventilated case, with no blades, R a D i = 6.3 × 10 7 , Dr = 1.25, and z / D = 0.74. CFD results are also shown. More about this image found in Convective heat flux measurements for a sealed and ventilated case, with no...

Fig. 9 Numerical predictions of inner surface Nu at z / D = 0.74 for a ventilated case at both experimental and engine scale More about this image found in Numerical predictions of inner surface Nu at z / D = 0.74 for a ventilate...

Fig. 10 Experimental transient cooling temperatures of the inner cylinder as it is cooled from an initial R a D i = 6.3 × 10 7 steady state. “t” is at θ = 0 deg; “b” is at θ = 144 deg. See Table 1 for information about each test condition. More about this image found in Experimental transient cooling temperatures of the inner cylinder as it is ...

Fig. 11 Top-to-bottom temperature difference curves for the inner cylinder ( i ), outer cylinder ( o ), and the inner cone ( c ), as the rig cooled down from R a D i = 6.3 × 10 7 . See Table 1 for information about each test condition. More about this image found in Top-to-bottom temperature difference curves for the inner cylinder ( i ), o...

Fig. 12 Experimental transient cooling temperatures of the outer cylinder as it is cooled from R a D i = 6.3 × 10 7 . “t” is at θ = 0 deg; “b” is at θ = 180 deg. See Table 1 for information about each test condition. More about this image found in Experimental transient cooling temperatures of the outer cylinder as it is ...

Fig. 13 CFD velocity contours at the radial mid-plane of the concentric cylinder section. Left: 0s o. Right: 4s o. More about this image found in CFD velocity contours at the radial mid-plane of the concentric cylinder se...

Fig. 14 Peak inner cylinder top-to-bottom temperature difference observed in transient cooling from R a D i = 6.3 × 10 7 , for different number of blades rows More about this image found in Peak inner cylinder top-to-bottom temperature difference observed in transi...

Fig. 1 Illustration of TUDa-GLR-OpenStage test rig More about this image found in Illustration of TUDa-GLR-OpenStage test rig

Fig. 2 Illustration of grid topology, flow domain, and boundary conditions of TUDa-GLR-OpenStage with a full-scale cavity seal More about this image found in Illustration of grid topology, flow domain, and boundary conditions of TUDa...

Fig. 3 Validation of the full-scale model on predicting the overall performance of the TUDa-GLR-OpenStage with stator cavity More about this image found in Validation of the full-scale model on predicting the overall performance of...

Fig. 4 Validation of the full-scale model on predicting the 2D distribution of the normalized difference in total pressure Δ π * at the design speed More about this image found in Validation of the full-scale model on predicting the 2D distribution of the...