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).
Technical analysis of heat distribution and friction losses in a 6-cylinder engine unit.
| Identifier | ExFiles\Box 69\4\ scan0355 | |
| Date | 17th October 1927 guessed | |
| contd :- -2- The appended diagram shews the heat distribution in the 6-cyl. unit which was obtained by various tests which we will describe later. Examining the total friction losses we notice that the heat equivalent of part of this is carried away by the jacket water. This part can be said to be due to piston friction and amounts to 24.2% of the total friction losses. We can account for approx. 27% of the friction losses in heat carried away by the oil. The oil carries away from the hot pistons a further amount of heat which amounts to approx. 29% of the total heat given to the oil. A large scale diagram shews the total heat given to the oil and the part of this which is due to the heat picked up from the pistons. In order to find the friction heat - chiefly piston friction - carried away by the jacket water we ran the engine at full throttle and cut out each cyl. in turn, at the same time taking the heat flow to the jacket water. We were thus able to find the heat drop per cyl. and therefore the heat due to friction when the cyl. was not firing. The heat given to the oil by the hot pistons was determined by measuring the temp. of the oil splash within the crankcase, with and without the cyls. firing also the flow through the bearings. As a max check on these figures the heat carried away by the cooler was obtained when it was adjusted to maintain a steady temperature. Having proved that some of the heat to the oil - approx. 29% of the total - came from the pistons it was thought contd :- | ||