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).
Page describing the calculation for the velocity of efflux, taking into account the velocity of approach.
| Identifier | ExFiles\Box 36\1\ scan 016 | |
| Date | 18th May 1936 guessed | |
| -4- Contd. If the velocity of approach v is appreciable, the available pressure head must be increased by an amount v²/2g so that the velocity of efflux becomes C_v √ (2gP/σ + v²) | ||