Comparison of the Sound Power Levels of an Aerodynamically Designed EGV and a State-of-the-Art EGV  

作　　者：Andreas Marn Thorsten Selic Martin Hoeger Dominik Broszat Florian Schonleitner Franz Heitmeir 

机构地区：[1]Institute for Thermal Turbomachinery and Machine Dynamics, Graz University of Technology, Graz 8010, Austria [2]MTU Aero Engines AG, Munich 80995, Germany

出　　处：《Journal of Energy and Power Engineering》2016年第9期566-579,共14页能源与动力工程（美国大卫英文）

摘　　要：Within previous EU projects, possible modifications to the engine components have been investigated, that would allow for an optimised aerodynamic or acoustic design of the EGV （exit guide vanes） of the TEC （turbine exit casing）. However, the engine weight should not be increased and the aerodynamic performance must be at least the same. This paper compares the sound power level of a state-of-the-art TEC （reference TEC） with typical EGVs with an aerodynamically optimised TEC configuration for the engine operating point approach. It is shown that a significant weight reduction （only bladings considered） and reduction in engine length can be achieved but the sound power level for the fundamental tone （lst blade passing frequency） for this acoustically important operating point is increased. It is also shown that the losses of the aerodynamical optimised EGVs are higher for this off design point but significantly lower at the aero design point. Measurements were conducted in the STTF （subsonic test turbine facility） at the Institute for Thermal Turbo machinery and Machine Dynamics, Graz University of Technology. The inlet guide vanes, the LPT （low pressure turbine） stage, and the EGVs have been designed by MTU Aero Engines.

关 键 词：Low pressure turbine exit guide vane turbine exit casing ACOUSTIC sound power level mode analysis. 

分 类 号：U469.11[机械工程—车辆工程] TB524[交通运输工程—载运工具运用工程]