Analysis of start-up and shutdown of rotor in complex wind conditions on sea-based oil rig

Jianhua Zhang, Edward Smith, Frank Zajaczkowski

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

A combined rotor transient responses and analysis tools/Computational Fluid Dynamics (CFD) effort was completed to assess rotor response in a complex flow field. A generic helicopter on an oil rig platform was chosen because the bluff nature of the rig presents unique challenges to rotorcraft operations. The rotor start-up and shutdown simulation model was validated with the test data. Comprehensive studies of rotor transient responses under various wind directions and wind speeds were conducted in order to establish the safe operation envelope. The study found that horizontal wind velocities may be accelerated by the oil-rig building corner, and cause significant rotor flap motions. The upwash and downwash flow due to the blockage of the helicopter fuselage to the cross wind had great impact on rotor transient responses; and the peak blade flap responses can be 2.5 time higher than the simulation results when the effect of airframe on airwake was ignored. The influence of unsteady airwake on rotor transient responses was also investigated, and the results showed that it could increase the blade tip deflections by 70% if the unsteady flow components were included. The sensitivity of rotor blade initial azimuth positions for rotor start-up operations was also examined.

Original languageEnglish (US)
Title of host publicationAmerican Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014
Subtitle of host publicationCurrent Challenges and Future Directions in Rotorcraft Aeromechanics
PublisherAmerican Helicopter Society International
Pages312-326
Number of pages15
ISBN (Electronic)9781634391788
StatePublished - Jan 1 2014
Event5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics - San Francisco, United States
Duration: Jan 22 2014Jan 24 2014

Publication series

NameAmerican Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics

Other

Other5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics
CountryUnited States
CitySan Francisco
Period1/22/141/24/14

Fingerprint

Rotors
Transient analysis
Helicopters
Turbomachine blades
Oils
Airframes
Fuselages
Unsteady flow
Flow fields
Computational fluid dynamics

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

Cite this

Zhang, J., Smith, E., & Zajaczkowski, F. (2014). Analysis of start-up and shutdown of rotor in complex wind conditions on sea-based oil rig. In American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics (pp. 312-326). (American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics). American Helicopter Society International.
Zhang, Jianhua ; Smith, Edward ; Zajaczkowski, Frank. / Analysis of start-up and shutdown of rotor in complex wind conditions on sea-based oil rig. American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics. American Helicopter Society International, 2014. pp. 312-326 (American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics).
@inproceedings{825fcc86cd374f938bc51677d708e6a5,
title = "Analysis of start-up and shutdown of rotor in complex wind conditions on sea-based oil rig",
abstract = "A combined rotor transient responses and analysis tools/Computational Fluid Dynamics (CFD) effort was completed to assess rotor response in a complex flow field. A generic helicopter on an oil rig platform was chosen because the bluff nature of the rig presents unique challenges to rotorcraft operations. The rotor start-up and shutdown simulation model was validated with the test data. Comprehensive studies of rotor transient responses under various wind directions and wind speeds were conducted in order to establish the safe operation envelope. The study found that horizontal wind velocities may be accelerated by the oil-rig building corner, and cause significant rotor flap motions. The upwash and downwash flow due to the blockage of the helicopter fuselage to the cross wind had great impact on rotor transient responses; and the peak blade flap responses can be 2.5 time higher than the simulation results when the effect of airframe on airwake was ignored. The influence of unsteady airwake on rotor transient responses was also investigated, and the results showed that it could increase the blade tip deflections by 70{\%} if the unsteady flow components were included. The sensitivity of rotor blade initial azimuth positions for rotor start-up operations was also examined.",
author = "Jianhua Zhang and Edward Smith and Frank Zajaczkowski",
year = "2014",
month = "1",
day = "1",
language = "English (US)",
series = "American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics",
publisher = "American Helicopter Society International",
pages = "312--326",
booktitle = "American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014",

}

Zhang, J, Smith, E & Zajaczkowski, F 2014, Analysis of start-up and shutdown of rotor in complex wind conditions on sea-based oil rig. in American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics. American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics, American Helicopter Society International, pp. 312-326, 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics, San Francisco, United States, 1/22/14.

Analysis of start-up and shutdown of rotor in complex wind conditions on sea-based oil rig. / Zhang, Jianhua; Smith, Edward; Zajaczkowski, Frank.

American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics. American Helicopter Society International, 2014. p. 312-326 (American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - Analysis of start-up and shutdown of rotor in complex wind conditions on sea-based oil rig

AU - Zhang, Jianhua

AU - Smith, Edward

AU - Zajaczkowski, Frank

PY - 2014/1/1

Y1 - 2014/1/1

N2 - A combined rotor transient responses and analysis tools/Computational Fluid Dynamics (CFD) effort was completed to assess rotor response in a complex flow field. A generic helicopter on an oil rig platform was chosen because the bluff nature of the rig presents unique challenges to rotorcraft operations. The rotor start-up and shutdown simulation model was validated with the test data. Comprehensive studies of rotor transient responses under various wind directions and wind speeds were conducted in order to establish the safe operation envelope. The study found that horizontal wind velocities may be accelerated by the oil-rig building corner, and cause significant rotor flap motions. The upwash and downwash flow due to the blockage of the helicopter fuselage to the cross wind had great impact on rotor transient responses; and the peak blade flap responses can be 2.5 time higher than the simulation results when the effect of airframe on airwake was ignored. The influence of unsteady airwake on rotor transient responses was also investigated, and the results showed that it could increase the blade tip deflections by 70% if the unsteady flow components were included. The sensitivity of rotor blade initial azimuth positions for rotor start-up operations was also examined.

AB - A combined rotor transient responses and analysis tools/Computational Fluid Dynamics (CFD) effort was completed to assess rotor response in a complex flow field. A generic helicopter on an oil rig platform was chosen because the bluff nature of the rig presents unique challenges to rotorcraft operations. The rotor start-up and shutdown simulation model was validated with the test data. Comprehensive studies of rotor transient responses under various wind directions and wind speeds were conducted in order to establish the safe operation envelope. The study found that horizontal wind velocities may be accelerated by the oil-rig building corner, and cause significant rotor flap motions. The upwash and downwash flow due to the blockage of the helicopter fuselage to the cross wind had great impact on rotor transient responses; and the peak blade flap responses can be 2.5 time higher than the simulation results when the effect of airframe on airwake was ignored. The influence of unsteady airwake on rotor transient responses was also investigated, and the results showed that it could increase the blade tip deflections by 70% if the unsteady flow components were included. The sensitivity of rotor blade initial azimuth positions for rotor start-up operations was also examined.

UR - http://www.scopus.com/inward/record.url?scp=84911387506&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84911387506&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84911387506

T3 - American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics

SP - 312

EP - 326

BT - American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014

PB - American Helicopter Society International

ER -

Zhang J, Smith E, Zajaczkowski F. Analysis of start-up and shutdown of rotor in complex wind conditions on sea-based oil rig. In American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics. American Helicopter Society International. 2014. p. 312-326. (American Helicopter Society International - 5th Decennial AHS Aeromechanics Specialists' Conference 2014: Current Challenges and Future Directions in Rotorcraft Aeromechanics).