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).
For Test 6, comparing clean and carbonised engines by measuring heat loss to the jacket water.
| Identifier | WestWitteringFiles\K\September1923\ Scan22 | |
| Date | 6th September 1923 | |
| B.R. 493A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} EXPERIMENTAL REPORT Expl. No. REF: Hs{Lord Ernest Hives - Chair}2/LG 6.9.23. Test 6. Comparison of clean and carbonised engines. See sheet 5. METHOD EMPLOYED FOR MEASURING THE HEAT LOSSES TO JACKET WATER. The water flow through cylinder jackets for different engine revs. was measured by means of a venturi meter in the water circuit. A curve of delivery was plotted and weight of water - corrected for temperature - determined. This curve was used as the standard throughout the experiments. The temperature difference between the inlet and outlet was measured by ordinary glass thermometers. The petrol consumption was measured directly by timing the consumption of one pint from a gauge and for the purpose of the heat distribution analysis the lower calorific value of the fuel was taken as 19,000 B.Th.U's/lb. The specific gravity of the fuel (Shell No.2) was .752. Attached are the results of experiments and the necessary curves. SUMMARY OF TESTS :- Tests 1 and 2. It is seen from the curve that the heat flow to the water jackets is greater for the same horse power in the case of the low compression engine. Also the effect of throttling is to increase the heat flow for the same power. On the same chart is shown the heat flow for a well-carbonised engine and it is seen that it falls below that of the clean engine. contd:- | ||