Impeller Blade Design In SolidWorks

A: Governing principle: Blade tip speed is based on tangential velocity at the outer radius, v = π·D·N. Applied here: 1800 rpm is 30 rev/s, so v = π × 0.48 × 30 ≈ 45.2 m/s for the stress screen. The mid-span assumption traps people who know the equation but quietly change the radius without adjusting the load case.

A: Governing principle: Centrifugal stress peaks at the blade root and scales with speed squared. Applied here: Overspeed amplifies tensile stress at the hub fillet, and cracks appear radially where hoop stress opens them. Cavitation catches engineers familiar with blade damage, but it doesn’t line up with dry overspeed testing or hub-localized cracking.

A: Governing principle: Geometry that drives flow must be verified against controlled datums before dynamic tests. Applied here: Angle at the gauge diameter defines incidence and head; diameter alone won’t expose stacked angular drift. Balancing first tempts people who trust dynamics to reveal geometry issues, but hydraulic errors can hide until system testing.

A: Governing principle: Outlet blade angle influences the tangential velocity component leaving the impeller. Applied here: A larger angle raises theoretical head and torque demand at the same rpm. The speed-dominant argument traps people who remember affinity laws but ignore velocity triangles.