PSI - Issue 50

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Diana D. Popova et al. / Procedia Structural Integrity 50 (2023) 236–250 Popova, Popov, Samoylenko / Structural Integrity Procedia 00 (2022) 000 – 000

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Fig. 14. Kinetic energy losses distribution along the height of the channel.

From the graph shown in Figure 14, it can be seen that the losses value in the working blade end face area is reduced by 5%, which indicates a decrease in the flow of the working fluid through the TC and a decrease in the vortex structures intensity in the case of a real non-parallel gap. This is also confirmed by the change in the size of the area "A" with a reduced Mach number in relative motion, located on the periphery of the flow path (see Figure 15).

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Popova, Popov, Samoylenko/ Structural Integrity Procedia 00 (2022) 000 – 000

Fig. 15. The Mach number contour in relative motion at the working crown outlet.

Table 4 presents the working crown parameters of the two cases: the turbine rotor total torque, the working fluid total flow rate at the turbine stage inlet, the integral value of kinetic energy losses in the working rim and the integral value of the turbine stage efficiency determined by according to equation (5):  M n