Turbopump Inducer Suction Speed Calculator
Rocket propulsion turbomachinery: Compute suction specific speed ($N_{ss}$ and $\Omega_{ss}$), blade tip speed ($U_{\text{tip}}$), Thoma cavitation parameter ($\sigma$), and hydrodynamic cavitation regime.
Pump Operating Parameters
Turbopump shaft RPM
Inlet shroud outer diameter
Typical helical inducer: 0.25–0.40
Standard gravity
Suction Performance & Cavitation
Suction Specific Speed N_ss (US):
--
rpm · gpm^0.5 / ft^0.75
Dimensionless Ω_ss (SI):
--
rad / dimensionless
Inducer Tip Speed U_tip:
--
m/s (ft/s)
Thoma Cavitation Parameter σ:
--
2·g·NPSH / U_tip²
| Axial Inlet Velocity V_axial: | -- |
| Inlet Flow Coefficient φ = V_ax / U_tip: | -- |
| Inlet Relative Flow Angle β_1: | -- |
| Cavitation Regime Classification: | -- |
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