In recent years, there has been a concern about increased intake noise levels of gas turbines as their flow rates increase, and the cost of noise control measures has tended to increase accordingly. On the other hand, gas turbine intake noise is dominated by a blade-passing frequency component of first-stage rotor blades of the axial-flow compressor, and some literature points out the relationship between the internal flow (shock waves generated in the transonic region) and the blade-passing frequency component of the noise, which was not considered in the conventional noise prediction method. Therefore, Mitsubishi Heavy Industries, Ltd. have developed a new prediction method that takes into account the mechanism of intake noise generation using our high-precision numerical analysis technology to improve the prediction accuracy of intake noise and optimize the noise control measures.
