Tonal noise prediction and validation on the ANC Frotor-stator configuration

作者：Sanjose Marlene^*; Daroukh Majd; de Laborderie Jerme; Moreaue Stephane; Mann Adrien

来源：Noise Control Engineering Journal, 2015, 63(6): 552-562.

DOI：10.3397/1/376349

Three numerical simulations on the NASA active noise control fan (ANCF) rig have been performed to investigate rotor-stator interaction noise on a realistic turbofan with a high hub-to-tip ratio. These simulations achieved with the PowerFlow solver based on the Lattice Boltzmann method provide very good direct acoustic prediction for both tonal and broadband noise. The tonal noise directivity is noticeably very well captured. These reliable results are then used to validate the implementation of in-duct rotor-wake interaction noise based on Amiet's analytical isolated blade response, in the in-house OPTIBRUI solver. The required detailed wake excitation is obtained by an averaging procedure that extracts the wake information from the numerical results while removing the potential effect. The analytical results for the rotor-stator interaction compare well with the detailed duct-modes measurements performed on the ANCF configuration. The influence of the stator vane count and the rotor-stator distance of the wake evolution is also emphasized and well captured on these well documented configurations. The precise description of the blade geometry in terms of stagger is also shown to be a key parameter for a realistic noise radiation upstream and downstream.

• 出版日期2015-12