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Q5 Figure 1 shows the unwrapped view of a typical stage of a turbomachinery component. The generic blade shape of the turbomachine is used here. x and e denote the axial and tangential directions, respectively. V is the absolute flow velocity at column with an incidence angle of a . V2 is the absolute flow velocity at column ?. x 1 1 А B Figure 1 The unwrapped view of a typical stage. A generic blade shape is used here.
[2] a) Identify the component according to the illustrated configuration in Figure 1. [3] b) Identify functions of column A and B, which one is the stator and which one is the rotor. Identify the rotational direction of the rotor blades (either up or down). [3] c) Sketch the velocity triangles for both column and column 3. Assume V3 = Vi and az = di: [4] c) Assume that the non-dimensional axial speed VX/Um is constant in the stage and equal to 0.5. The absolute flow velocity at column is va = 300 m/s with an angle of an = 30°. The enthalpy change in one stage is 200 kJ/kg. Assume V3 = V1 and a3 = 41. Find the tangential velocity at column 2 Vze.