Colloquium: Sidharth Krishnan Kalyani (AWEP)

18 september 2019 08:30 - Locatie: Lecture Room K, Faculty of Aerospace Engineering, Kluyverweg 1, Delft.

Experimental investigation of fan-stage interaction noise of a turbofan engine

A characterization experiment of a simple test setup to assess its ability to predict the vortex-cascade interaction noise as in a realistic fan-stage is performed in this master thesis. The setup consists of an arrangement of linear cascade of OGVs, and a rod which mimics the rotor of a turbofan engine. Measurement techniques utilized are Acoustic (microphones placed on directivity arcs, and beamforming using recessed microphone placed in the test section wall) and Aerodynamic (Hot-Wire Anemomentry, at different locations of the test section). The test section is observed to successfully emulate the vortex-cascade interaction noise and this noise is observed to scale with the sixth power of flow speed. The beamforming array is found to help in improving the Signal-to-Noise Ratio of acoustic measurements in the test section and hence allows the quantification of the upstream propagation of vortex-cascade interaction noise.