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).
Preliminary report from John Marston Limited on oil cooler tests carried out on a test plant.
| Identifier | ExFiles\Box 150\2\ scan0295 | |
| Date | 1st December 1939 | |
| COPY. JOHN MARSTON LIMITED. WOLVERHAMPTON. December 1939. PRELIMINARY REPORT ON OIL COOLER TESTS CARRIED OUT on TEST PLANT. --------------------- DESCRIPTION OF PLANT. The Oil Cooler under test is mounted in a duct of similar diameter coupled to the suction side of a centrifugal fan driven by Rolls Royce "Phantom III" engine capable of generating 200 H.P. which is also the source of heat input to the oil. The cooler is arranged in the mid-length of the duct and is supplied with oil by a motor driven gear pump. The rate of oil flow is regulated by cocks which can be adjusted to give any desired flow. The oil flow is measured by timing the deflection between two electric contacts of a cantilever spring carrying an oil weight tank. A travel corresponding to a weight of 90 lbs. is used for this measurement. The oil is heated in two stages, firstly, by a heat exchanger supplied with hot water from the engine cylinder jackets and secondly by specially designed heaters fitted to the exhaust jackets. The oil temperatures are measured in standard "Amal" type oil thermometer pockets mounted near to the cooler inlet and outlet. Oil pressures gauges are also connected at these points. The airflow is measured through an orifice plate and mounted at one end of a large metering box and is recorded on a calibrated manometer registering up to 220 cubic feet. of air per sec. The static air pressure drop through the cooler is measured by the difference between manometer readings taken in the first and second halves of the duct, the manometers being connected to a ring of static pressure holes at a distance of three times the duct diameter before and after the cooler. The duct pressure drop between the two static pressure rings without the cooler has also been ascertained. The airflow is regulated by a butterfly mounted in the duct near the fan, and adjustable air intakes are also provided in the fan cowling. The air temperatures are measured at three points in front of the cooler and at six points at the rear of the cooler. Suitable baffles for | ||