Numerical and Experimental Investigation of the Turbofan First Booster Stage Tone Noise
* Presenting author
An important problem of turbofan design is maintenance of low noise emission. One of the components of turbofan noise is the tone noise arising due to inter-row interactions in the booster stages. For modern turbofans this component of noise can be significant at approach certification point. The investigations of the tone noise of the first booster stage have been carried out in CIAM during last several years. They were performed using frequency domain method for simulation of tone noise of multistage turbomachines developed in CIAM. The advantage of the method is the high speed of calculations; however it relies on some ad hoc assumptions about the process of interactions between flow field disturbances and blade rows. This work presents the results of the tone noise calculation of the first booster stage using time domain approach based on multirate Runge-Kutta scheme. The result, obtained in the calculation, is independent from any assumptions about the interactions in the multistage turbomachine. This allows verifying the results of previous calculations. In general satisfactory correspondence were found between the results of computations in time and in frequency domains and between them and experimental data obtained in the CIAM C-3A acoustic test facility.