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).
Experiments comparing hot spot and pre-heated intake air systems on Phantom engines.
| Identifier | ExFiles\Box 66\2\ scan0203 | |
| Date | 26th June 1926 | |
| To R. {Sir Henry Royce} from Hs {Lord Ernest Hives - Chair} /ACL. c. to BJ. Wor. {Arthur Wormald - General Works Manager} c. to RG. {Mr Rowledge} E. {Mr Elliott - Chief Engineer} c. to DA. {Bernard Day - Chassis Design} BY. {R.W. Bailey - Chief Engineer} c. to OY. X8230 Hs {Lord Ernest Hives - Chair} /ACL1/LG26.6.26. INDUCTION PIPE HEATING ON PHANTOM ENGINES. +4305 In view of the unreliable action which is manifest with the standard hot spot choke valve in the exhaust pipe, and which - as shewn by previous experiments - is the only disadvantage possessed by an otherwise good system, it has been suggested that perhaps pre-heated intake air could replace, entirely or partly, the exhaust heated bend. Experiments were made to compare the efficiency of the hot air and hot spot systems, also the effect upon power and efficiency of high air intake temperature - such as would result in hot climates - when occurring with the standard high temperature hot spot, was investigated. At the moment further tests are in progress to try out the suggestions for increased circulation of the exhaust gases in the hot spot at light loads as given in Rl/Mll.6.26 and El/Ml2.6.26., and transfer the choke valve to one of the jacket pipes. We are also endeavouring to increase the rate of warming up from cold of the superheated system by reducing both the size of the feed hole and the capacity of the boiler. COMPARISON OF HOT SPOT AND PREHEATED INTAKE AIR. To determine if heat supplied to the ingoing air could take the place of the hot spot in correcting [overstruck] distribution errors was the object of the following experiment. contd :- | ||