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B. ROTOR CAVITATION The boost pump rotor has two major design criteria: they are blade loading and blade cavitation. The blade loading was considered to be within normal design practice as outlined in Ref 5. The cavitation criteria of high setting angle, axial flow blading, however, has only recently been evaluated. Cavitationnumbers for stationary cascade, high setting angle blades are given in Ref 6, but data for this type of blade under rotation and with inlet prewhirl were not available. i. Cavitation Model To evaluate the design parameters which influence rotor cavitation, an analytical model was developed. This model defines the available rotor cavitation constant as the dependent parameter. Cavitation constant (K) has long been used to evaluate cavitation performance and is defined as follows: _2 2 K=_- -_ (i) (i - ,_)2 + _2 The inlet NPSH of the rotor will be equal to the actual head rise of the inducer if it is assumed that the NPSH of the inducer equals the increase in fluid vapor head due to heating within the inducer. It is also assumed that there will be no contour change between the inducer exit and rotor inlet. (A similar, valid expression can, however, be derived with contour changes.) NPSH R = AHI = 2 _IUl g 2g AHI _R = UR2 x 2g _IUI 2 _R- 2x g UR TR= 2 _I SR2 (2) 7PDF Image | HUBLESS INDUCER FLOW HYDRAULIC TURBINE INDUCER BOOST PUMP
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