// multi-utility computation suite · offline · instant · precise
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eng.propeller-cavitation-Thoma Calculator
Calculates propeller cavitation risk using the Thoma cavitation number from local pressure, vapour pressure, and flow velocity. Cavitation onset occurs when the local pressure falls below vapour pressure — inception cavitation number σi is the threshold for blade cavitation.
Inputs
P Atm Kpa
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
H Submersion M
Vertical extent downward, or thickness of a layer. For tanks: affects pressure at the base (P = ρgh).
V Tip M S
Speed in a specified direction (m/s). Required for momentum, kinetic energy, and wave calculations.
Pv Kpa
Force per unit area (Pa). Atmospheric pressure at sea level: 101,325 Pa. Check whether gauge or absolute pressure is required.
Results
cavitation number σ
The value at the specified point or condition.
hydrostatic + atmospheric pressure (Pa)
pH of the solution. Below 7: acidic. 7: neutral. Above 7: basic (alkaline).
dynamic pressure q (Pa)
Sample size or count used in the calculation.
σ = (P_ref - P_v) / (½ρv²)
Reference formula or conversion factor shown for context.
cavitation risk
Overall risk level based on the computed score or classification. Higher risk may call for mitigating actions or additional review.