Research on the Aero Dynamicity of Steady Wing of Non-Parachute Terminal Sensitive Projectile

2014 ◽  
Vol 527 ◽  
pp. 65-68
Author(s):  
Sheng Tao Lv ◽  
Xiao Dong Ma ◽  
Rong Zhong Liu ◽  
Rui Guo
Keyword(s):  
Drag Coefficient ◽  
Fluid Structure Interaction ◽  
Aerodynamic Characteristics ◽  
Attack Angle ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Scanning Motion ◽  
Rigid Wing ◽  
Interaction Relationship

The stable wing of non-parachute terminal sensitive projectile (TSP) is a plate wing with two bent angles at edges of the plate wing, thus it looks like an S. Wings of this shape slow the TSP down during its falling process which provides asymmetric forces for it. Then stable scanning motion is realized. This paper established unsteady model of the S wing of the TSP based on CFD/CSD fluid structure interaction (FSI) and analyzed the aerodynamic characteristics of both rigid wing and elastic wing. The results show that the plate which bends towards the windward has the largest deformation. The drag coefficient of the elastic wing is smaller than that of rigid wing at a smaller attack angle while bigger at a larger attack angle. The displacement of S wing increases while the incoming velocity increases and has a tiny interaction relationship with attack angle.

scholarly journals Analysis of aerodynamic characteristics of flexible flapping flap with bidirectional fluid–structure interaction

AIP Advances ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 105108
Author(s):  
Jie Qin ◽  
Lun Li ◽  
Yongping Hao ◽  
Jiulong Xu ◽  
Fan Bai ◽  
...  
Keyword(s):  
Fluid Structure Interaction ◽  
Aerodynamic Characteristics ◽  
Fluid Structure ◽  
Structure Interaction

scholarly journals NUMERICAL SIMULATIONOF FLEXIBLE WINGOF HALE UAV USING TWO-WAY FLUID STRUCTURE INTERACTION METHOD

2017 ◽  
Vol 9 (1) ◽  
pp. 19
Author(s):  
Buyung Junaidin
Keyword(s):  
Fluid Structure Interaction ◽  
Aerodynamic Characteristics ◽  
Navier Stokes ◽  
Fluid Structure ◽  
Aerodynamic Loads ◽  
Structure Interaction ◽  
Induced Drag ◽  
Material Characteristics ◽  
Wingtip Vortex ◽  
Aerial Vehicle

This paper describes numerical simulation o f flexible High Altitude Long Endurance Unmanned Aerial Vehicle (HALE UAV)wingusing two-way fluid structure interaction (FSI) method. The HALE wing is designed with high aspect ratio. This configuration intended to reduce the vehicle induced drag and reduces the lift-loss at wingtip which caused by wingtip vortex. But the structure of the wing itself becomes more elastic that be able to give large deformation when the aerodynamic loads applied. This deformation changes the aerodynamic loads distribution on the wing that gives a new deformation to the wing structure and vice versa. This interaction in a couple process called as fluid structure interaction (FSI). ANSYS 15.0 software was used to simulate fluid structure interaction on the wing. The unsteadiness and viscous flows at low speed are evaluated using the solution o f timedependent Reynolds Averaged Navier-Stokes (RANS) with SST k-rn turbulent model. In addition, multiblock structured grids are generated to provide more accurate viscous result and to anticipate negative volume o f the mesh which may occur due to the deformation o f the wing during simulation. Five different o f simulations are performed with variation o f material characteristics including Young’s modulus and Poisson’s ratio.The results are global aerodynamic characteristics at various material characteristics.

scholarly journals Numerical Simulation of Fluid-Structure Interaction of D-shape Iced Conductor

2019 ◽  
Author(s):  
Yan Zhitao ◽  
You Yi ◽  
Yang Xiaogang ◽  
Li Wensheng ◽  
He Cheng ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Aerodynamic Force ◽  
Numerical Study ◽  
Fluid Structure Interaction ◽  
Maximum Amplitude ◽  
Mean Value ◽  
Attack Angle ◽  
Vibration Displacement ◽  
Fluid Structure ◽  
Structure Interaction

At present, the numerical simulation on the aerodynamic response and force of the iced conductor are mainly based on the quasi steady criterion, which ignored the interaction between the conductor and the flow field. This paper presents a numerical study of three kinds of fluid-structure interaction models for D-shape conductor. The effects of reduced velocity, degree of freedom and wind attack angle on aerodynamic response of the iced conductor are discussed. The results show that the rotational freedom has certain influence on the across-wind vibration. The mean value of drag coefficient decreases with the increase of wind attack angle, while the lift and moment coefficient increase with the increase of wind attack angle. When the maximum amplitude of vibration displacement occurs, the corresponding reduced velocity is not entirely consistent with that of the maximum aerodynamic force.

scholarly journals Investigations of aerodynamic drag forces during structural blade testing using high fidelity fluid-structure interaction

2019 ◽  
Author(s):  
Christian Grinderslev ◽  
Federico Belloni ◽  
Sergio González Horcas ◽  
Niels N. Sørensen
Keyword(s):  
Drag Coefficient ◽  
Wind Turbine ◽  
Fluid Structure Interaction ◽  
Three Dimensional ◽  
Experimental Tests ◽  
Test Facility ◽  
High Fidelity ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Drag Forces

Abstract. Aerodynamic loads on wind turbine blades that are tested for fatigue certifications, need to be known for planning and defining test loads beforehand. It is known that the aerodynamic forces, especially drag, are different for tests and operation, due to the entirely different flow conditions. In test facilities, a vibrating blade will move in and out of its own wake increasing the drag forces on the blade. This is not the case in operation. To study this special aerodynamic condition present during experimental tests, numerical simulations of a wind turbine blade during pull-release tests were conducted. High fidelity three dimensional computational fluid dynamics methods were used throughout the simulations. By this, the fluid mechanisms and their impact on the moving blade are clarified and through the coupling with a structural solver, the fluid-structure interaction is studied. Results are compared to actual measurements from experimental tests, verifying the approach. It is found that the blade experiences a high drag due to its motion towards its own whirling wake, resulting in an effective drag coefficient of approximately 5.3 for the 90 degree angle of attack. This large drag coefficient was implemented in a fatigue test load simulation, resulting in a significant decrease of moment along the blade, leading to less load applied than intended. The confinement from the test facility did not impact this specific test setup, but simulations with longer blades could possibly yield different conclusions. To the knowledge of the authors, this investigation including three dimensional effects, structural coupling and confinement is the first of its kind.

scholarly journals Investigations of aerodynamic drag forces during structural blade testing using high-fidelity fluid–structure interaction

2020 ◽  
Vol 5 (2) ◽  
pp. 543-560 ◽  
Author(s):  
Christian Grinderslev ◽  
Federico Belloni ◽  
Sergio González Horcas ◽  
Niels Nørmark Sørensen
Keyword(s):  
Drag Coefficient ◽  
Wind Turbine ◽  
Fluid Structure Interaction ◽  
Three Dimensional ◽  
Experimental Tests ◽  
Test Facility ◽  
High Fidelity ◽  
Fluid Structure ◽  
Structure Interaction ◽  
Drag Forces

Abstract. Aerodynamic loads need to be known for planning and defining test loads beforehand for wind turbine blades that are tested for fatigue certifications. It is known that the aerodynamic forces, especially drag, are different for tests and operation, due to the entirely different flow conditions. In test facilities, a vibrating blade will move in and out of its own wake, increasing the drag forces on the blade. This is not the case in operation. To study this special aerodynamic condition present during experimental tests, numerical simulations of a wind turbine blade during pull–release tests were conducted. High-fidelity three-dimensional computational fluid dynamics methods were used throughout the simulations. In this way, the fluid mechanisms and their impact on the moving blade are clarified, and through the coupling with a structural solver, the fluid–structure interaction is studied. Results are compared to actual measurements from experimental tests, verifying the approach. It is found that the blade experiences a high drag due to its motion towards its own whirling wake, resulting in an effective drag coefficient of approximately 5.3 for the 90∘ angle of attack. This large drag coefficient was implemented in a fatigue test load simulation, resulting in a significant decrease in bending moment along the blade, leading to less load being applied than intended. The confinement from the test facility did not impact this specific test setup, but simulations with longer blades could possibly yield different conclusions. To the knowledge of the authors, this investigation, including three-dimensional effects, structural coupling and confinement, is the first of its kind.

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