MU Zhong-qiang, QIAO Wei-yang, ZHAO Lei. Investigation of tonal noise in high pressure turbine stage due to non-uniform inlet entropy of inflow[J]. 2012, 27(3).
MU Zhong-qiang, QIAO Wei-yang, ZHAO Lei. Investigation of tonal noise in high pressure turbine stage due to non-uniform inlet entropy of inflow[J]. 2012, 27(3).DOI:
Through using the flow solver which activated phase-lag method
got the three-dimensional(3-D) unsteady flow field in a high pressure turbine stage which had hot spots in inlet
and then by using the mode matching method in the duct of downstream rotor
the rotor-stator interaction discrete noise which propagated downstream was obtained.After compared with the case without hot spots in turbine inlet
the results show that the total acoustic power level of rotor-stator interaction discrete noise emitted in the downstream direction is increased by 5.9dB at the blade-passing frequency and by remarkably 11.6dB at the first harmonic of the blade-passing frequency.