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).
Test comparing the warming-up rates of an exhaust-heated hot spot versus a water-heated bend for a Phantom induction pipe.
| Identifier | WestWitteringFiles\S\June1928-August1928\ Scan006 | |
| Date | 7th June 1928 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/ACL. ORIGINAL Hs{Lord Ernest Hives - Chair}/ACL1/LG7.6.28. RE. PHANTOM INDUCTION PIPE HEATING. X8070 We have made a test to compare the rate of temp. rise of the std. exhaust heated hot spot with the best results we have been able to obtain with a water heated bend. The water heated system we employed in this case was to circulate the whole the cylinder jacket water through the hot spot without passing through the radiator - see sketch. This we imagine should give the quickest warming up of the hot spot we could obtain with a water heated system because a vigorous water circulation through the hot spot is ensured and thereis a minimum quantity of water to heat, only the water contained in the c/l. jackets. For this test we took the outside temperature of the hot spot by means of ordinary glass thermometers inserted in tubes welded to the hot spot. The engine was started up from cold and run light at 700 r.p.m., the temperature being noted every half minute. Appended curves shew that the water heating gives a slightly quicker temperature rise. We have shewn the temps. taken near the inlet and outlet of the hot spot. It will be noticed that there is a considerable difference in temperature recorded between the thermometer near the inlet and that one near the outlet in the case of the exhaust heated experiment. This could be accounted for to some extent by the low specific heat of the exhaust gas - i.e. the gas rapidly loosing heat contd :- | ||