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).
Tests examining the influence of hot spot temperature on engine power and efficiency.
| Identifier | WestWitteringFiles\O\2January1926-March1926\ Scan90 | |
| Date | 14th January 1926 guessed | |
| contd :- -10- INFLUENCE OF HOT SPOT TEMPERATURE ON POWER & EFFICIENCY. The following tests were made in an endeavour to show how the power and efficiency were influenced by each of the three systems when operating normally at full load. Speeds of 1500 and 750 r.p.m. were selected, the lower one so that the value of the heating system in correcting distribution - which was naturally worse at low speeds than at high - could be estimated. The method of making the test was by varying the mixture strength over approx. its maximum range of steady running and observing the corresponding values of the torque and consumption. The following curves of specific consumption in terms of pts/B.HP/Hr. are plotted against the B.M.E.P. By this means we are able from the one set of curves to observe the variation in the maximum B.M.E.P. and the minimum consumption for the various hot spot temperatures occurring with each system under full load conditions. In order to ensure as accurate a comparison as possible the same hot spot was used for each test and was adapted for each system in turn. We know that the total heat supplied to the charge depends not only upon that supplied by the hot spot but also upon that carried in by the air. Therefore we kept the outside air temperature as near as we could the same for each test (approx. 33 to 40°C). Looking at the curves taken at 750 r.p.m. we noticed that there is practically no difference contd :- | ||