涡桨发动机进气道多种声学处理方案的ACTRAN分析.pdf

Actran Users’ Conference 2012 October 3-4, 2012 - Brussels, Belgium ACTRAN/TM Analyses of Multiple Acoustic Treatment Concepts in the Inlet Duct of a Turboprop Engine Lysbeth S. Lieber Honeywell International Inc. Outline  Introduction  Inlet Duct and Acoustic Treatment  Problem Definition  ACTRAN/TM Model Setup  ACTRAN/TM Simulation Results  Follow-On Studies  Conclusions Actran Users’ Conference 2012 Outline  Introduction  Inlet Duct and Acoustic Treatment  Problem Definition  ACTRAN/TM Model Setup  ACTRAN/TM Simulation Results  Follow-On Studies  Conclusions Actran Users’ Conference 2012 Introduction  Honeywell TPE331-14 turboprop engine - Single-engine aircraft installation  Problem: - High broadband noise levels at the ground idle operating condition - Concerns regarding ramp noise exposure for passengers  Goal: - Suppress lower-frequency broadband noise to acceptable levels at ground idle - Frequency range: 800-5,000 Hz  Design Approach: Treated Inlet Duct Actran Users’ Conference 2012 Outline  Introduction  Inlet Duct and Acoustic Treatment  Problem Definition  ACTRAN/TM Model Setup  ACTRAN/TM Simulation Results  Follow-On Studies  Conclusions Actran Users’ Conference 2012 Geometry of the Inlet Duct  Typical TPE331 turboprop installation for single-engine aircraft: - Single, short inlet duct positioned below the propeller shaft - Inlet duct directs air flow into the engine compressor - Compressor noise propagates forward and radiates outward from duct  Geometric Constraints for Acoustic Treatment: - Ge