From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Formulas and variable definitions for centrifugal blowers.
| Identifier | ExFiles\Box 173\2\ img018 | |
| Date | 22th March 1933 guessed | |
| Centrifugal Blowers. No. / Tu ηu = (3.2 * W) / (u * P₁ * A * (1/T₁ + R/T₂)) = (3.2 * W * T₁ * ψ) / (u * P₁ * A * (R - 1)) K = (R - 1) / (u² * (1/T₁ + R/T₂)) = (T₁ * ψ) / u² W = Delivery (lbs/min) u = Tip speed (ft/sec) P₁ = Inlet pressure (lbs/o'') A = Rotor peripheral area (sq ins) T₁ = Inlet temperature (°K) R = Compression ratio ψ = (R - 1) / (1 + (R^((γ-1)/γ) - 1) / ηa) ηa = Adiabatic efficiency γ = Ratio of sp.{Mr Spinney} heats. | ||