Aerodynamic Performance of a Low Aspect Ratio Active Rear Wing Package Designed for the OSU Formula SAE Team

2022 ◽  
Author(s):  
Tanner Price ◽  
Ryan C. Paul
Keyword(s):  
Aspect Ratio ◽  
Aerodynamic Performance ◽  
Formula Sae ◽  
Low Aspect Ratio ◽  
Rear Wing

Simulation of Three-Dimensional Viscous Flow Within a Multistage Turbine

1990 ◽  
Vol 112 (3) ◽  
pp. 370-376 ◽  
Author(s):  
J. J. Adamczyk ◽  
M. L. Celestina ◽  
T. A. Beach ◽  
M. Barnett
Keyword(s):  
Aspect Ratio ◽  
Flow Field ◽  
Three Dimensional ◽  
Equation System ◽  
Aerodynamic Performance ◽  
Experimental Measurements ◽  
Low Aspect Ratio ◽  
Blade Row ◽  
Multistage Turbine ◽  
Secondary Flow Field

This work outlines a procedure for simulating the flow field within multistage turbomachinery, which includes the effects of unsteadiness, compressibility, and viscosity. The associated modeling equations are the average passage equation system, which governs the time-averaged flow field within a typical passage of a blade row embedded within a multistage configuration. The results from a simulation of a low aspect ratio stage and one-half turbine will be presented and compared with experimental measurements. It will be shown that the secondary flow field generated by the rotor causes the aerodynamic performance of the downstream vane to be significantly different from that of an isolated blade row.

Sailing Downwind: Aerodynamic Performance of the Velella Sail

1991 ◽  
Vol 158 (1) ◽  
pp. 117-132
Author(s):  
LISBETH FRANCIS
Keyword(s):  
Natural Selection ◽  
Wind Tunnel ◽  
Aspect Ratio ◽  
Hydrodynamic Force ◽  
Center Of Pressure ◽  
Aerodynamic Force ◽  
Aerodynamic Performance ◽  
Polar Plot ◽  
Low Aspect Ratio

Using a wind tunnel built over a shallow pool and methods devised for measuring the performance of yacht sails, I describe aerodynamic performance in situ for the sailor-by-the-wind, Velella velella. By contrast with designers of the modern yacht mainsail, natural selection has apparently favored stability and seaworthiness over performance to windward. The Velella sail is a low aspect ratio airfoil with an unusually flat polar plot. Primarily a drag-based locomotory structure, this thin, leaf-like sail generates maximum force when oriented at attack angles between 50° and 90°. In the wind tunnel, free-sailing animals spontaneously assumed stable orientations at attack angles ranging from 28° to 87° and sailed with their hulls approximately broadside to the apparent flow of oncoming water. At these angles, aerodynamic force on the sail is asymmetrical, with the center of pressure upwind of the sail midline. Since aerodynamic force on the sail is balanced at equilibrium by hydrodynamic force on the hull, this orientation must be caused by asymmetrical forces acting on surface and underwater parts as the wind drags the animal along the surface of the water.

scholarly journals An Aerodynamic Design Method to Improve the High-Speed Performance of a Low-Aspect-Ratio Tailless Aircraft

2021 ◽  
Vol 11 (4) ◽  
pp. 1555
Author(s):  
Zhongyuan Liu ◽  
Lie Luo ◽  
Binqian Zhang
Keyword(s):  
Aspect Ratio ◽  
High Speed ◽  
Design Method ◽  
Aerodynamic Performance ◽  
Pitching Moment ◽  
Aerodynamic Design ◽  
Linear Superposition ◽  
Low Aspect Ratio ◽  
Drag Ratio ◽  
Lift To Drag Ratio

This paper puts forward an aerodynamic design method to improve the high-speed aerodynamic performance of an aircraft with low-aspect-ratio tailless configuration. The method can ameliorate the longitudinal moment characteristics of the configuration by designing and collocating the key section airfoils with the constrains of fixed parameters of planform shape and capacity. Firstly, the effect of twisting the wing, fore-loading and aft-reflexing key section airfoils on the high-speed aerodynamic performance of the configuration is evaluated by high-fidelity numerical methods, and quantified by defining trimming efficiency factors. Then, a linear superposition formula is obtained by analyzing the effect rule of trimming efficiency factor, and based on the formula the design and collocation methods of key section airfoils are achieved. According to the methods, a trimmed configuration is obtained. The results of computational fluid dynamics (CFD) and wind tunnel tests show that the trimmed configuration has smaller zero-lift pitching moment and higher available lift-to-drag ratio than the initial configuration at cruise, besides the trimmed configuration achieves the design principle raised for tailless configuration, which can be described as the zero-pitching moment, cruising design lift coefficient, and maximum lift-to-drag ratio are coincident. In addition, at off-design conditions, the trimmed configuration shows favorable drag divergence characteristics, satisfactory aerodynamic characteristics at medium-altitude maneuvering condition, and good stall and pitching-moment performance at low speed state.

Computer-Aided Front and Rear Wings Aerodynamic Design of a Formula SAE Racing Car

2011 ◽  
Vol 120 ◽  
pp. 20-25 ◽  
Author(s):  
Mei Nan Chen ◽  
Wen Hui Tang ◽  
Bo Yang ◽  
Xing Jun Hu
Keyword(s):  
Aerodynamic Performance ◽  
Vehicle Body ◽  
Cfd Analysis ◽  
Aerodynamic Design ◽  
Formula Sae ◽  
Dynamic Events ◽  
Rear Wing ◽  
Computational Fluid Dynamics Analysis ◽  
Final Design ◽  
Front Wing

The objective of this research is to design a set of front and rear wings that can help maximize the down-force to enhance the aerodynamic performance of 2011 Jilin University Formula SAE racing car in dynamic events. In this research, computational fluid dynamics analysis is used for the design of the front and rear wings. Based on a given vehicle body styling, twenty sets of front wing and rear wing profile are investigated, the influence of the endplate shape on the wing aerodynamic performance is also investigated, and one plan was chosen as final design, which is suitable for the vehicle at a relatively low speed (70km/h). The CFD analysis results show that the suitable front wing and rear wing will enhance the aerodynamic performance of the racing car significantly.

scholarly journals Simulation of Three-Dimensional Viscous Flow Within a Multistage Turbine

1989 ◽  
Author(s):  
John J. Adamczyk ◽  
Mark L. Celestina ◽  
Tim A. Beach ◽  
Mark Barnett
Keyword(s):  
Aspect Ratio ◽  
Flow Field ◽  
Three Dimensional ◽  
Equation System ◽  
Aerodynamic Performance ◽  
Experimental Measurements ◽  
Low Aspect Ratio ◽  
Blade Row ◽  
Multistage Turbine ◽  
Secondary Flow Field

This work outlines a procedure for simulating the flow field within multistage turbomachinery which includes the effects of unsteadiness, compressibility, and viscosity. The associated modeling equations are the average passage equation system which governs the time-averaged flow field within a typical passage of a blade row embedded within a multistage configuration. The results from a simulation of a low aspect ratio stage and one-half turbine will be presented and compared with experimental measurements. It will be shown that the secondary flow field generated by the rotor causes the aerodynamic performance of the downstream vane to be significantly different from that of an isolated blade row.

scholarly journals Effects of Blade Tip Profile Based on NACAAirfoil on Aerodynamic Performance of Low Aspect Ratio Radial-inflow Turbine

2020 ◽  
Vol 56 (18) ◽  
pp. 172
Author(s):  
WANG Xing ◽  
ZHU Yangli ◽  
LI Wen ◽  
ZUO Zhitao ◽  
CHEN Haisheng
Keyword(s):  
Aspect Ratio ◽  
Aerodynamic Performance ◽  
Low Aspect Ratio ◽  
Blade Tip ◽  
Radial Inflow Turbine
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