《Table 3 Effe cts of improve d nozzle shape on noise and ae rodynamic pe rformance》

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《Investigation on Noise Control Technology of Ultra-High Expansion Ratio Turbine》

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Effects of improved nozzle shape on noise as w ell as aerodynamic performance of the single stage ultra-high expansion ratio turbine are show n in Table3.The noise level is the average values of the noise at all the observation points in the dow nstream of rotor outlet.As show n in Table 3，the aerodynamic noise w as reduced by more than 10 d B w ith the proposed noise control method.Whilst mass flow rate，expansion ratio and adiabatic efficiency change a little.Relative variations of M ach number at nozzle out and rotor inlet/outlet are less than 5%.It is proved that proposed aerodynamic noise control methods are able to reduce noise level by more than10 d B w ithout remarkable effect on aerodynamic performance in this single stage ultra-high expansion ratio turbine.