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).
Letter discussing the effects of increased water circulation on engine cooling performance.
| Identifier | ExFiles\Box 24\4\ Scan117 | |
| Date | 10th December 1923 | |
| Oy1-E-121023 4766 December 10, 1923. Mr. E.{Mr Elliott - Chief Engineer} W. Hives, % Rolls-Royce, Ltd., Derby, England. Hs{Lord Ernest Hives - Chair} from Oy. Re: Water Circulation Many thanks for your letter of November 27th. Your letter states that you can find no appreciable benefit from the increased circulation. I see what you mean by referring to Lovesey's report Hs{Lord Ernest Hives - Chair}2/L.G.6.9.23 which shows that on 3.9 to 1 compression engine at 500 R.P.M. the outlet temp. is 80°C and the inlet temp. 58°C, and at 2000 R.P.M. outlet is 83°C and inlet 70°C. Hence if the water circulation were doubled inlet temperatures would be 69°C and 76°C respectively for same outlet temperatures, and the average temperature of the radiator would only be increased 5.5°C and 3.25°C respectively which would give only a small increase in the capacity of the radiator to transmit heat to the air. But at least this increase would do no harm and is in the right direction. Our ideas were a little different from this however and are not capable of test on the bench. Does the increased circulation help towards the elimination of steam pockets when climbing hills on top gear at 15 m.p.h. with the radiator too much covered up or in hot weather? I know the 40/50 is remarkably good in running full power for long periods with the water on the boiling point, but the increased circulation might make it even better, by mechanical sweeping away of steam bubbles on the cylinder walls. If it is even a little better than the curved vane rotor, do you not think we should adopt it? We do for several reasons. (1) Far easier to produce accurately. (2) Slightly improved use of existing radiator surface. (3) Probable assistance in eliminating hot spots in water jacket. (4) Better mixing of outlet stream from jackets with water in radiator in winter with probable decrease in distilling off of alcohol at top of radiator. | ||