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).
Formula for calculating volume flow with notes on reliable gas flow comparison.
| Identifier | ExFiles\Box 17\6\ Scan150 | |
| Date | 30th August 1933 guessed | |
| -7- ∴ Vol flow at (3) = 22.34 K P₁ / √T₁ ___________________ P₃ / RT₃ = 39.35 K T₃P₁ / (P₃√T₁) cu.ft/min. T in °O abs. T₃ "OC abs. P₁ & P₃ "Hg. abs. ___________________ This is the formula on which all the air flows following have been calculated. - for large nozzle - 2.5" dia. - the constant is 175 instead of 39.35. Note:- For reliable comparison of gas flows through a restriction, it is desirable that the pressure and temperature of the gas should be as nearly the same in each case as possible - hence where possible the pressure difference across valve was kept constant and the air flow measured, rather than the flow being kept constant and the pressure difference measured. For prints See x1497. | ||