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).
Experimental range of results from tests conducted on an R.A.E. oil cooler for the 'Hercules III' engine.
| Identifier | ExFiles\Box 150\2\ scan0296 | |
| Date | 1st December 1939 guessed | |
| - 2 - Continued:- mixing the air are placed in the duct. Arrangements have been made for the conduction of tests with any desired entry air temperatures. An air heater is, therefore, mounted in the duct entry and is supplied with hot water from the cylinder jackets. For cold air tests a refrigerating system is being installed. The cooling medium is trichlorethylene which is cooled to a temperature of - 70°C. with solid carbon dioxide. The trichlorethylene is allowed to flow through a heat exchanger mounted at the duct entry. The plant is designed to cool 270 lbs of air per minute from 20°C to 20°C for forty minutes EXPERIMENTAL RANGE OF RESULTS. The first tests were carried out on the standard 2 element 10¾" dia. R.A.E. Oil Cooler as supplied to Bristol Aeroplane Co. Ltd. for the "Hercules III" engine. An oil-flow of 360 gallons per hour was maintained during these tests and airflows, varying from 1.5 to 4 lbs. of air per second were used. Oil inlet temperatures of the required range 120°C to 130°C were maintained and the corresponding oil outlet temperatures measured. The corresponding oil pressure drops and air pressure drops were noted. The results obtained are given in this report and are expressed graphically, both as heat dissipation against air flow and heat dissipation against air pressure drops. Tests were also carried out on an experimental cooler of similar size fitted with special tubes. These results are given in similar form. | ||