Analysis and modeling of the tip leakage flow on the performance of small-scale turbopumps for ORC applications

• An automated design model is developed to generate impeller geometries suitable for organic Rankine cycles. The influence of tip clearance investigated and modeled. At high blade outlet angles, the effects flow rate on slip factor diminish. head rise decreases with ratio. Feedforward neural networks are trained loss coefficient unshrouded centrifugal pumps. In this paper, performance small-scale turbopumps studied numerically extensive parameter ranges cycle applications. A novel fully parameterized used a wide range their fluid domains carry out three-dimensional computations across stage. Impellers at different operating conditions, accomplished results analyzed characterize off-design conditions. CFD calculations demonstrate that dependent not only its geometrical parameters, as considered by most correlations, but also decreased almost linearly increased. addition, ratio influences factor, non-linear. ratios increase. However, radial impellers, higher was observed small (<0.10). numerical data employed infer reduced-order models considering effect in early-phase process turbopumps. predict an average relative deviation 3.6 % 5.8 coefficient, respectively.