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Chapter 4 Design Criteria and Specification of Swirl Distribution In this chapter the specification of the swirl (rVe) and the criteria used for assessing the aerodynamic goodness of results from design calculation for the main and splitter blades are discussed. 4.1 Design Criteria As has been noted in the Introduction (Chapter 1), the work by Yang has resulted in guidelines for choosing an optimum rVs distribution based on two criteria: * the maximum adverse reduced static pressure gradient on the suction surface of the blade, which can influence boundary layer separation in real flow * the wake number, which gives a measure of the extent of secondary flow devel- opment In Ref.1, the parametric influence of loading distribution, stacking position, lean in stacking angle, slip factor, number of blades, and hub and shroud profile geometry on the blade shape and the resulting flow field has been explored. However the results in Ref.1 show that for a rather wide choices of rV0 distribution, the resulting blade shapes are such that the blade filaments at constant z section are highly nonradial; this aspect of the blade shape is usually not acceptable from structural/stress consideration. Furthermore there also exists a region of inviscid reversed flow on the pressure surface which may imply flow separation for real fluid. In the present investigation, the inclusion of splitter blades in the design is proposed as a mean to eliminate or reduce the reversed flow region and to arrive at designs inPDF Image | Radial Inflow Splitter Blades in Three-Dimensional
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