Fig. 1 START facility overview highlighting the main components in this study START facility overview highlighting the main components in this study More

Fig. 2 Diagram of the START test turbine showing the radial distribution of sensors Diagram of the START test turbine showing the radial distribution of sensors More

Fig. 3 Diagram of ( a ) rim seal, rim seal cavity, and main gas path sensor locations and ( b ) back view of the instrumented vane showing fast-response pressure and temperature sensors in the radial and circumferential locations Diagram of (a) rim seal, rim seal cavity, and main gas path sensor... More

Fig. 4 Thermal efficiency and cooling effectiveness [ 22 ] as a function of nondimensional purge flowrates with and without VTE flow Thermal efficiency and cooling effectiveness [22] as a function of nondimensional purge flowrates with and without VTE flow More

Fig. 5 Time trace of normalized parameters measured at Φ p /Φ ref = 0.7 and Φ VTE /Φ ref = 0.4 Time trace of normalized parameters measured at Φp/Φref = 0.7 and ΦVTE/Φref = 0.4 More

Fig. 6 Discrete Fourier transforms of normalized pressure coefficient and thermal efficiency for inflection region purge flowrates of Φ p /Φ ref = 0.6 (left column), Φ p /Φ ref = 0.7 (center column), and Φ p /Φ ref = 0.9 (right column) Discrete Fourier transforms of normalized pre... More

Fig. 7 Maximum amplitude of normalized pressure coefficient ( C p *), cavity temperature efficiency ( θ *), and cooling effectiveness ( ɛ cc ) for the ( a ) baseline and ( b ) nominal VTE configurations Maximum amplitude of normalized pressure coefficient (Cp*), cavity temperature efficiency (... More

Fig. 8 Fast-response pressure data plotted versus normalized rotational position showing raw and filtered signals in the rim seal at a purge flowrate Φ p /Φ ref = 0.4 Fast-response pressure data plotted versus normalized rotational position showing raw and filtered signals in the rim seal a... More

Fig. 9 Pitch-average normalized cell speed (Ω S /Ω D ) for the baseline and nominal VTE configurations at locations A and E from the experiment Pitch-average normalized cell speed (ΩS/ΩD) for the baseline and nominal VTE configurations at locations A and E from the experiment More

Fig. 10 Radial distribution of swirl ratio ( β ) at various purge flowrates (Φ p /Φ ref ) using URANS CFD simulations Radial distribution of swirl ratio (β) at various purge flowrates (Φp/Φref) using URANS CFD simulations More

Fig. 11 Pitch-average cell count ( N S ) for the baseline and nominal VTE configurations at locations A and E from experiment Pitch-average cell count (NS) for the baseline and nominal VTE configurations at locations A and E from experiment More

Fig. 12 Rim cooling effectiveness ( ɛ cc ) at a purge flowrate of Φ p /Φ ref = 0.7 and VTE flowrate Φ VTE /Φ ref = 0 depicting ( a ) full-wheel results and ( b ) a magnified section of the wheel showing the recirculation zone Rim cooling effectiveness (ɛcc) at a purge flowrate of Φp/Φ... More

Fig. 13 Coefficient of pressure ( C p,a ) at a purge flowrate of Φ p /Φ ref = 0.7 and VTE flowrate Φ VTE /Φ ref = 0 depicting ( a ) full-wheel results and ( b ) a magnified section of the wheel showing the recirculation zone Coefficient of pressure (Cp,a) at a purge flowrate of Φp/Φre... More

Fig. 1 Impinging jet deposition facility schematic Impinging jet deposition facility schematic More