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).
Water flow and evaporative cooling tests on engine cylinders under various conditions.
| Identifier | ExFiles\Box 179b\2\ img136 | |
| Date | 19th November 1932 | |
| -3- Hw/Ing.2/W.19.11.32. Cont'd.{John DeLooze - Company Secretary} These figures are similar to those obtained from standard cylinders. It is mentioned however that the detonation note is lighter - i.e. apparently of higher frequency - than that of the standard blocks. Water Flow. - Flow readings were taken with the blocks as specified in the DBS i.e. without any additional restriction washers - under International H.P., 2 lbs/sq.in. outlet pressure, 10.7 lbs/sq.in. absolute inlet pressure and an inlet temperature of 75°C. R.P.M. FLOW GALLS/MIN. 2250. 120. 2500. 133. (b) Evaporative Cooling. In order to establish the cylinders for evaporative coolings a Kestrel header tank to drawing INS.157 was mounted in the standard aircraft position and operated with an unrestricted steam outlet. The conditions of no reversal i.e. of maintaining water in the cylinders on shutting down quickly when running evaporatively cooled - was obtained by fitting a 13/16" diam. restriction washer between the horn pipes and the cylinder blocks, the 1/2" dia. washer included in the DBS. being retained in the rear outlet passage. This scheme gave a temperature rise of 9.5°C. across the engine running water cooled. The arrangement of restriction washers enumerated does not leave any margin from a reversal standpoint and although numerous schemes were tried no appreciable improvement resulted and as the foregoing restriction scheme gave a reasonable flow and temperature rise it was adopted. Water Displacement. - Curve 352F. shows the water level in the header tank (INS.157) for various pump inlet temperatures during the course of warming up to boiling when running at 2250 R.P.M. Water Flow. - (1) To A.P. Schedule.1208. Flows to this schedule were made at 2250 and 2500 R.P.M., being as follows :- R.P.M. FLOW. GALLS/MIN. 2250. 64. 2500. 76. | ||