Inlet Air Flow Sensing for the iSTC-21v Small Jet Engine

Abstract

Accurate measurement of the flow rate of air entering the jet engine is very important from the point of view of the design of control algorithms and diagnostic systems (e.g. when classifying situational frameworks of situational control, or when predicting unmeasured parameters or the failure of other measured parameters within the diagnostic system, the design and implementation of which for micro (JetCat P-80, TJ-20) and small (iSTC-21v, TJ-100) jet engines is devoted to the scientific research team of the Laboratory of Intelligent Aircraft Engines). In order to accurately measure the air flow rate in the entire cross-section of the inlet device of the iSTC-21v small jet engine based on the value of the local velocity, temperature and pressure, it is necessary to know the distribution of the absolute velocity at the entrance to the engine (e.g. we may be interested in the homogeneity of the absolute velocity and turbulence, by sensing which using CTA equipment or pressure probes, another scientific and research team of the Aerodynamic Tunnel Laboratory). The speed distribution is also influenced by the shape of the bell mouth – the leading edge of the newly designed iSTC-21v engine inlet assembly (as opposed to the classic engine inlet assembly, where the flow rate of air is not measured). Using the numerical CFD simulation in Ansys and the program for calculating the superellipse coordinates in Matlab, in the presented article we are devoted to the pilot design of the inlet device with the sensing of the air flow amount of the small jet engine iSTC-21v.