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Investigation on the Dynamic Response of a Wide-Chord Fan Blade Under Ground Vortex Ingestion

  • Zhonglin Wang
  • Yong ChenEmail author
  • Hua Ouyang
  • Anjenq Wang
Original Paper
  • 2 Downloads

Abstract

This paper presents a computational study of the dynamic response of the fan blade owing to the excitations from the ingested ground vortex when the turbofan engine is operating on the ground or during the takeoff run. Firstly a numerical method consisting of static, modal and transient analyses is proposed to investigate the dynamic vibration characteristics of a fan blade model with pre-vibration. Modal analysis is conducted to find the critical speed of blade resonances, and the intersection of the fourth engine order and the second bending mode is identified for the study. Secondly, transient analyses of the vortex ingestion are carried out to investigate the resulting blade responses. Various parameters, including different ingestion timings, rotating speeds, ingestion positions and modes of pre-vibration are discussed. Results of dynamic displacement and stress illustrate that the effect of the ingested vortex is significant. Especially when the fan blade is working at the critical speed where engine orders intersect with the dynamic frequencies, the stress is amplified by 276.6% and the displacement is amplified by 156.7%. This paper demonstrates a preliminary method to connect the flow excitations of the ground-ingested vortex and the fan blade vibration characteristics, and provides a helpful reference to the further study of the fan blade vibration.

Keywords

Ground vortex ingestion Dynamic response Pre-vibration Amplification ratio 

Abbreviations

EO

Engine order

FOD

Foreign object damage

List of Symbols

Fc

Centrifugal force

Ft

Dynamic force

Fv

Force of the pre-vibration

P

Pressure of the ingested vortex

ξu

Amplification ratio of displacement

ξσ

Amplification ratio of stress

up

Maximum displacement response

uv

Displacement response of pre-vibration

σp

Maximum dynamic stress

σv

Stress response of pre-vibration

Notes

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Copyright information

© The Korean Society for Aeronautical & Space Sciences 2019

Authors and Affiliations

  1. 1.School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghaiChina
  2. 2.Collaborative Innovation Center for Advanced Aero-EngineBeijingChina
  3. 3.Engineering Research Center of Gas Turbine and Civil Aero Engine, Ministry of EducationShanghaiChina

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