Imperial College London
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DrSinaStapelfeldt

Faculty of Engineering, Department of Mechanical Engineering

Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 7076s.stapelfeldt

 
 
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Assistant

 

Mr Peter Higgs +44 (0)20 7594 7078

 
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Location

 

556City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Stapelfeldt:2016:10.1115/1.4032186,
author = {Stapelfeldt, SC and Parry, AB and Vahdati, M},
doi = {10.1115/1.4032186},
journal = {Journal of Turbomachinery},
pages = {1--10},
title = {Investigation of flutter mechanisms of a contra-rotating open rotor},
url = {http://dx.doi.org/10.1115/1.4032186},
volume = {138},
year = {2016}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The growing pressure to reduce fuel consumption and cut emissions has triggered renewed interest in contra-rotating open rotor (CROR) technologies. One of their potential issues is self-excited or forced vibration of the unducted, light-weight, highly swept blades. This paper presents a numerical study into the flutter behavior of a CROR rig at take-off conditions. The study presented in this paper aimed to validate the numerical approach and provide insights into the flutter mechanisms of the open rotor under investigation. For the initial validation, pressure profiles and thrust coefficients from steady-state mixing plane calculations were compared against rig measurements. A full domain unsteady analysis predicted front rotor instability at low advance ratios. Flutter occurred in the first torsional mode in 0 and 1 nodal diameter (ND) which agreed with experimental observations. Subsequent unsteady computations focused on the isolated front rotor and first torsional mode. The flow field and aerodynamic damping over a range of advance ratios were studied. It was found that minimum aerodynamic damping occurred at low advance ratios when the flow was highly three-dimensional on the suction side. A correlation between the quasi-steady loading on the blade and aeroelastic stability was made and related to the numerical results. The effects of variations in frequency were then investigated by linking local aerodynamic damping to the unsteady pressure on the blade surface.
AU  - Stapelfeldt,SC
AU  - Parry,AB
AU  - Vahdati,M
DO  - 10.1115/1.4032186
EP  - 10
PY  - 2016///
SN  - 0889-504X
SP  - 1
TI  - Investigation of flutter mechanisms of a contra-rotating open rotor
T2  - Journal of Turbomachinery
UR  - http://dx.doi.org/10.1115/1.4032186
UR  - https://asmedigitalcollection.asme.org/turbomachinery/article-abstract/138/5/051009/378651/Investigation-of-Flutter-Mechanisms-of-a-Contra
VL  - 138
ER  -
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