Advanced Ducted Engine Nacelle Aerodynamics and Integration Testing

1992 ◽  
Vol 114 (4) ◽  
pp. 802-808 ◽  
Author(s):  
J. E. McCall ◽  
P. Tracksdorf ◽  
K. Heinig
Keyword(s):  
Wind Tunnel ◽  
Aircraft Engine ◽  
Integration Testing ◽  
Wind Tunnel Tests ◽  
Key Features ◽  
Bypass Ratio ◽  
Engine Nacelle ◽  
Engine Development

Future aircraft engine development may lead to Advanced Ducted Engines (ADE), which have a bypass ratio significantly higher than present turbofans. The increases in bypass ratio will dictate larger diameter nacelles and an increasing importance of the nacelle aerodynamics and wing integration aerodynamics. A series of isolated wind tunnel tests was therefore designed and conducted by PWA and MTU to investigate inlet, nozzle, and reverser aerodynamics. Additional installed testing was done in cooperation with MBB and BAe. Key features of the tests are noted and significant results are discussed.

Advanced Ducted Engines Nacelle Aerodynamics and Integration Testing

1991 ◽  
Author(s):  
J. E. McCall ◽  
Peter Tracksdorf ◽  
Klaus Heinig
Keyword(s):  
Wind Tunnel ◽  
Aircraft Engine ◽  
Integration Testing ◽  
Wind Tunnel Tests ◽  
Key Features ◽  
Bypass Ratio ◽  
Engine Development

Future aircraft engine development may lead to Advanced Ducted Engines (ADE) which have a bypass ratio significantly higher than present turbofans. The increases in bypass ratio will dictate larger diameter nacelles and an increasing importance of the nacelle aerodynamics and wing integration aerodynamics. A series of isolated wind tunnel tests was therefore designed and conducted by PWA and MTU to investigate inlet, nozzle and reverser aerodynamics. Additional installed testing was done in cooperation with MBB and BAe. Key features of the tests are noted and significant results are discussed.

Wind Tunnel Tests and Modeling Studies of Aircraft Engine Ice Accretion

2003 ◽  
Author(s):  
K Venkataramani ◽  
Chellappa Balan ◽  
Ron Plybon ◽  
Rick Donaldson ◽  
Richard Caney
Keyword(s):  
Wind Tunnel ◽  
Aircraft Engine ◽  
Ice Accretion ◽  
Wind Tunnel Tests ◽  
Modeling Studies

CFD Model of a Narrowbody Aircraft Elliptical Inlet

2003 ◽  
Author(s):  
R. Thomas Wiegmann ◽  
Pericles Pilidis ◽  
Antonios Tourlidakis
Keyword(s):  
Separation Bubble ◽  
Incidence Angle ◽  
Aircraft Engine ◽  
Analysis Tool ◽  
Design Requirement ◽  
Lower Lip ◽  
Inlet Distortion ◽  
Computational Fluid Dynamics Cfd ◽  
Bypass Ratio ◽  
Engine Nacelle

The objective of this paper will be to determine if the “elliptical inlet” on the lower lip of a popular narrowbody aircraft engine nacelle is capable of handling inlet distortion and lip separation. Ground clearances considerations on this aircraft required an elliptical lower lip on the inlet. A grid of the nacelle incorporating this elliptical inlet will be built in order to utilize computational fluid dynamics (CFD) as an analysis tool. In addition, another grid will be created for a nacelle with a normally circular inlet as the only difference in the nacelle. This will serve as the baseline for the analysis. Preliminary results indicate that the high bypass ratio turbofan intake with the “elliptical inlet” does seem capable of delivering a clean, undistorted stream of air with a total pressure recovery to the fan face and subsequently the engine core, when a 20 deg angle of attack at Takeoff (T/O) is considered the design requirement. The CFD results also give evidence of the presence of a lip separation bubble on the lower lip as the incidence angle increases. This can be seen quite clearly in the CFD results, where there are lower pressure regions manifested in the shape of a small bubble on the inside of the lower lip towards the edge. This phenomenon intensifies as the incidence angle increases.

scholarly journals Wind-Induced Phenomena in Long-Span Cable-Supported Bridges: A Comparative Review of Wind Tunnel Tests and Computational Fluid Dynamics Modelling

2021 ◽  
Vol 11 (4) ◽  
pp. 1642
Author(s):  
Yuxiang Zhang ◽  
Philip Cardiff ◽  
Jennifer Keenahan
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wind Tunnel ◽  
Careful Analysis ◽  
Wind Effects ◽  
Wind Tunnel Tests ◽  
Long Span Bridges ◽  
Long Span ◽  
Comparative Review ◽  
Dynamics Modelling

Engineers, architects, planners and designers must carefully consider the effects of wind in their work. Due to their slender and flexible nature, long-span bridges can often experience vibrations due to the wind, and so the careful analysis of wind effects is paramount. Traditionally, wind tunnel tests have been the preferred method of conducting bridge wind analysis. In recent times, owing to improved computational power, computational fluid dynamics simulations are coming to the fore as viable means of analysing wind effects on bridges. The focus of this paper is on long-span cable-supported bridges. Wind issues in long-span cable-supported bridges can include flutter, vortex-induced vibrations and rain–wind-induced vibrations. This paper presents a state-of-the-art review of research on the use of wind tunnel tests and computational fluid dynamics modelling of these wind issues on long-span bridges.

Galloping vibration of stay cable installed with a rectangular lamp: Field observations and wind tunnel tests

2021 ◽  
Vol 215 ◽  
pp. 104685
Author(s):  
An Miao ◽  
Li Shouying ◽  
Liu Zhiwen ◽  
Yan Banfu ◽  
Li Longan ◽  
...  
Keyword(s):  
Wind Tunnel ◽  
Field Observations ◽  
Stay Cable ◽  
Wind Tunnel Tests

Wind tunnel tests and dynamic analysis of wind-induced response of a transmission tower on a hill

2021 ◽  
pp. 136943322110339
Author(s):  
Jian Guo ◽  
Changliang Xiao ◽  
Jiantao Li
Keyword(s):  
Wind Tunnel ◽  
Wind Field ◽  
Dynamic Responses ◽  
Interactive Effects ◽  
Induced Response ◽  
Transmission Tower ◽  
Structural Dynamic ◽  
Wind Tunnel Tests ◽  
Hill Slope ◽  
The Hill

A hill with a lattice transmission tower presents complex wind field characteristics. The commonly used computational fluid dynamics (CFD) simulations are difficult to analyze the wind resistance and dynamic responses of the transmission tower due to structural complexity. In this study, wind tunnel tests and numerical simulations are conducted to analyze the wind field of the hill and the dynamic responses of the transmission tower built on it. The hill models with different slopes are investigated by wind tunnel tests to measure the wind field characteristics, such as mean speed and turbulence intensity. The study shows that the existence of a transmission tower reduces the wind speed on the leeward slope significantly but has little effect on the windward slope. To study the dynamic behavior of the transmission tower, a hybrid analysis procedure is used by introducing the measured experimental wind information to the finite element tower model established using ANSYS. The effects of hill slope on the maximum displacement response of the tower are studied. The results show that the maximum value of the response is the largest when the hill slope is 25° compared to those when hill slope is 15° and 35°. The results extend the knowledge concerning wind tunnel tests on hills of different terrain and provide a comprehensive understanding of the interactive effects between the hill and existing transmission tower regarding to the wind field characteristics and structural dynamic responses.

Wind Tunnel Experimental Research on Flutter Stability of Liujiaxia Bridge

2013 ◽  
Vol 361-363 ◽  
pp. 1105-1109
Author(s):  
Chun Sheng Shu
Keyword(s):  
Wind Tunnel ◽  
Critical Velocity ◽  
Experimental Research ◽  
Wind Tunnel Test ◽  
Suspension Bridge ◽  
Wind Tunnel Tests

Liujiaxia Bridge is a truss stiffening girder suspension bridge which span is 536m, and it is the narrowest suspension bridge with the same scale, so the problems of flutter stability are prominent. Results of wind tunnel test show that its critical velocity cannot meet the requirements without any aerodynamic measures. Based on above considerations, seven kinds of aerodynamic measures are proposed, respectively wind tunnel tests are conducted. The results show that the program, in which the upper central stable board is 1.12m high and the under central stable board is 1.28m high, can meet the requirements. The results of this study provide some references to solving the problem of wind-resistant stability of narrow deck suspension bridge.

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