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).
Formulae and example calculations for determining bonnet temperature using bypass control and shutter methods.
| Identifier | ExFiles\Box 87\5\ scan0158 | |
| Date | 21th September 1934 | |
| -2- Ha/Std.7/KW.21.9.34. Let B1 = temp. of air after passing through matrix, with atmospheric temp. of T1 B2 = temp. of air after passing through matrix with atmospheric temp. of T2 M = mean water temp. in radiator, with shutters in operation } All temps. in oC. absolute. Formulae for determination of bonnet temp. B2 (a) Bypass Control. B2 = B1 + T2 - T1 - (B1 - T1)(1 - T2/T1) (b) Shutter Method. B2 = T2 + (M - T2)/(M - T1) (B1 - T1) Taking figures obtained at Brooklands (30 M.P.H.), with an air temp. of 20oC, bonnet temps. were respectively (a) 32.0oC. (b) 39.0oC. Mean water temp. = 70oC. With an air temp. of 0oC, these become (a) 10.9oC. (b) 26.6oC. Hs{Lord Ernest Hives - Chair}/Std. | ||