ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Aerodynamic-acoustic Three-dimensional Numerical Optimization of Low Pressure Turbine: Lean Vane Strategy
Received date: 2012-03-05
Revised date: 2012-06-26
Online published: 2012-07-03
The low pressure turbine of an aircraft is an important engine noise source at approach power, and there is a high requirement on its aerodynamic efficiency. The noise level of a low pressure turbine must be considered together with its aerodynamic performance to achieve a significantly quiet low pressure turbine design. In this paper some insights are presented on three-dimensional aerodynamic-acousitc optimization for a high performance and low noise level turbine. First, a steady computational fluid dynamics (CFD) simulation is made to evaluate the aerodynamic performance with three-dimensional design variations. Then the unsteady aerodynamic effects and tonal noise level are obtained using unsteady CFD calculation combined with a triple-plane pressure (TPP) matching strategy. Finally an optimal design plan is selected. Taking as an example the calculation of the last stage of a GE-E3 (Energy Efficient Engine) low pressure turbine, the potential of using lean vanes as a turbine tonal noise reduction strategy is numerically simulated. The results show that when the positive lean angle is smaller than 19° the single stage turbine performance is improved, with a maximum enhancement of efficiency of 0.3%. Evaluation of tonal noise shows that positive lean increases the noise level, for it changes the characteristics of vane wakes, which means this method cannot be employed for noise reduction. The numerical simulation indicates that this three-dimensional optimization method can reflect simultaneously the effects of detailed three-dimensional changes of a blade on its aerodynamic and acoustic performance, and it can be effectively used in the aerodynamic-acousitc optimization process.
Key words： low pressure turbine; aerodynamics; acoustics; lean; tonal noise
ZHAO Lei , QIAO Weiyang , TAN Hongchuan . Aerodynamic-acoustic Three-dimensional Numerical Optimization of Low Pressure Turbine: Lean Vane Strategy[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013 , 34(2) : 246 -254 . DOI: 10.7527/S1000-6893.2013.0028
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