Mechanical & Aerospace Engineering

Biography

Biography: Wang Bin

Abstract

As one of the major parameters of fuel system in aero-engine tests, fuel flowrate is basically measured by turbine flowmeters(TFM). However, the meter coefficient would inevitably change due to the action of working medium, ambient condition or component wear. Regular calibration of the fuel TFMs must be carried out closely. Calibration can be essentially divided into static calibration and dynamic calibration. Because no dynamic calibration equipment and no corresponding appraisal procedure are applicable currently to these flowmeters used for a long time, confidence level for its dynamic measurement results is greatly affected and the practical demands for dynamic tests of high-maneuver aircrafts cannot be satisfied. In this work, a novel fuel hydraulic circuit is designed, in which a nozzle-flapper valve is adopted to generate a standard flow excitation, and the homologous driving schemes including the torque motor type and the piezoelectric stack type are given as the alternative solutions to drive the high-speed exciting valve. Based on a brief introduction of the calibration system principle, these two above-mentioned driving schemes are mathematically modelled and simulated using AMESim softwae tool respectively. Simulation results show that dynamic calibration system driven by piezoelectric-stack provides a faster and larger excitation flow than by the torque motor. In the mean time, the piezoelectric-stack driving scheme can ensure the reliable anti-electromagnetic interference (EMI) and control the flapper flutter more effectively.