The experimental investigation of water spray disperse parameters behind the water injecting system at the aircraft engine inlet by applying PSV

Abstract

To provide an aircraft engine certification tests for water ingestion, it is necessary to control accurately the parameters of the water drops generated by the water injecting device simulating rain at the engine inlet. The paper presents the results of autonomous tests of a single-channel centrifugal nozzle for the water injecting device. The tests purpose is to investigate the disperse parameters of the water spray for the typical operation modes of the nozzle as a part of the water injecting system. Tests were carried out at the experimental setup using the PSV (Particle Shadow Velocimetry) technique at three typical nozzle operation modes. As a result of the tests, the distribution graphs of the D10, D32 and Dv50 diameters, axial velocity (U) and mass flow (Mabs) of water droplets over the radius of the spray pattern have been obtained. To assess Dv50 mean median diameter of spray droplets the cumulative distribution functions of the droplets mass fraction depending on the size for each of the operation modes of the nozzle have been plotted. On the basis of these functions, the mean median diameters of water spray droplets have been calculated.