Jet Engine Flow Meters
Flow Monitoring Jet Engine Oil Consumption
Titan Enterprises recently supplied a set of aerospace flow meters with associated electronics to a leading aerospace company. The objective was to meter the oil consumption of a jet engine to an accuracy, better than ±0.5%. The jet engine flow meters were calibrated using the actual fluid used in the engine, and referenced oil manufacturer’s density charts in order to apply corrections for temperature changes. A calibrated platinum resistance sensor was incorporated into the jet engine flow meter’s body to ensure accurate temperature measurement.
During testing of the jet engine flow meters and flow monitoring jet engine oil consumption, the customer weighed the oil at the start of the run, ran the engine for a pre-determined period and weighed the remaining oil to see how much the engine had consumed. After the initial test the customer reported that the supplied aerospace fluid flow meters were over 0.5% out from their mass tests. They returned the Titan jet engine flow meters to the factory and we re-calibrated and attained virtually identical results to our first run. Doubting our flow calibration rigs we did a mass calibration on our flow rigs but this appeared to confirm that everything was calibrated correctly.
We could see no problems with the techniques used but could not explain the offset in the answer which was repeatable but wrong. As a consequence we decided to check the density correction matrix we had entered into the system in case we had made a repeated error. Handed a copy by the aerospace company of their own density correction chart we noted it was 0.5% offset from the oil manufacturer’s data. Entering the customer’s empirically collated data our fluid flow sensor performed perfectly.