Turbine Tone Noise Reduction via Optimized Acoustic Coupling

摘要

This work aims to demonstrate the potential of the Optimized Acoustic Coupling (OAC) technique via numerical predictions. OAC consists of combining two noise reduction practices, Acoustic Coupling (AC) and Optimized Vane Shape (OVS), with additional benefits than optimized isolatedly. AC and OVS are firstly examined as separated concepts with measurements of two state-of-the art, multi-stage, cold-flow, turbine rigs. The vehicles are noise tested in CTA, located in Bilbao (Spain), and funded through ENOVAL and Clean Sky European Programs. Measured AC and OVS benefits are compared with the numerical method results for assessing predictability. Additional benefits of combining these two technologies into OAC are assessed via numerical predictions and the physical mechanisms behind are identified.