Radial Inflow Splitter Blades in Three-Dimensional

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Radial Inflow Splitter Blades in Three-Dimensional ( radial-inflow-splitter-blades-three-dimensional )

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The relative angular distance between the blades at the stacking positions need not be necessarily set to 7r/B (i.e., the splitter blade is exactly halfway between the main blades at the stacking position) so that it can be viewed as an additional degree of freedom. The choice of this additional degree of freedom at the stacking position can influence the relative mass flow between the two different passages: one the passage between the suction side of the main blade and the pressure side of the splitter blade and the other the passage between the suction side of the splitter blade and the pressure side of the main blade. This implies that the relative angular distance can influence the velocity field. In this study, the relative angle is expressed as a fraction of the angle between the main blades (i.e., 2ir/B) and is denoted by a. For a close to zero the splitter blade is close to the suction side of the main blade while for a close to unity the splitter blade is close to the pressure side of the main blade. 5.4 The Iteration Process As Eq.(5.1) implies, the amount of wrap of the blade shapes is determined by the mean velocity on the left hand side. Thus if the right hand side is finite and at some point the mean velocity approaches zero, the blades can have a large change in the camber angle; this is undesirable from the design point of view. For this reason, the minimum mean velocity is monitored in the computational procedure and if it falls below a certain threshold, the rVa distribution is then altered accordingly in an attempt to increase it. Usually, it is done by reducing the value of 9' at the point of minimum mean velocity, which can readily be done if the point is close to the hub or shroud. The parameter a can also be varied in an attempt to increase the mean velocity.

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