scholarly journals Numerical Study on the Aerodynamic Characteristics of a Three-Dimensional Power-Augmented Ram Wing in Ground Effect

1996 ◽  
Vol 1996 (179) ◽  
pp. 31-39 ◽  
Author(s):  
Nobuyuki Hirata
Keyword(s):  
Numerical Study ◽  
Three Dimensional ◽  
Ground Effect ◽  
Aerodynamic Characteristics ◽  
Wing In Ground Effect

Effect of Vaned Diffuser on a Modified Turbocharger Centrifugal Compressor Performance

2014 ◽  
Vol 663 ◽  
pp. 347-353
Author(s):  
Layth H. Jawad ◽  
Shahrir Abdullah ◽  
Zulkifli R. ◽  
Wan Mohd Faizal Wan Mahmood
Keyword(s):  
Centrifugal Compressor ◽  
Numerical Study ◽  
Pressure Ratio ◽  
Three Dimensional ◽  
Aerodynamic Characteristics ◽  
Width Ratio ◽  
Outlet Section ◽  
Suction Surface ◽  
Vaned Diffuser ◽  
Minimum Width

A numerical study that was made in a three-dimensional flow, carried out in a modified centrifugal compressor, having vaned diffuser stage, used as an automotive turbo charger. In order to study the influence of vaned diffuser meridional outlet section with a different width ratio of the modified centrifugal compressor. Moreover, the performance of the centrifugal compressor was dependent on the proper matching between the compressor impeller along the vaned diffuser. The aerodynamic characteristics were compared under different meridional width ratio. In addition, the velocity vectors in diffuser flow passages, and the secondary flow in cross-section near the outlet of diffuser were analysed in detail under different meridional width ratio. Another aim of this research was to study and simulate the effect of vaned diffuser on the performance of a centrifugal compressor. The simulation was undertaken using commercial software so-called ANSYS CFX, to predict numerically the performance charachteristics. The results were generated from CFD and were analysed for better understanding of the fluid flow through centrifugal compressor stage and as a result of the minimum width ratio the flow in diffuser passage tends to be uniformity. Moreover, the backflow and vortex near the pressure surface disappear, and the vortex and detachment near the suction surface decrease. Conclusively, it was observed that the efficiency was increased and both the total pressure ratio and static pressure for minimum width ratio are increased.

Numerical Study of Aerodynamics of a Wing-in-Ground-Effect Craft

2014 ◽  
Vol 51 (3) ◽  
pp. 913-924 ◽  
Author(s):  
Qiulin Qu ◽  
Zhe Lu ◽  
Peiqing Liu ◽  
Ramesh K. Agarwal
Keyword(s):  
Numerical Study ◽  
Ground Effect ◽  
Wing In Ground Effect

scholarly journals Оценка аэродинамических и летно-технических характеристик экраноплана с учетом поддува струи от воздушного винта

2021 ◽  
Vol 46 (1) ◽  
Author(s):  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Computational Experiment ◽  
Ground Effect ◽  
Aerodynamic Characteristics ◽  
Flight Performance ◽  
Analysis Program ◽  
Kinematic Parameters ◽  
Element Analysis ◽  
Wing In Ground Effect

Аннотация: Представлены основные результаты исследования (с использованием CFD-технологий и упрощенной авторской методики) аэродинамических характеристик экраноплана схемы «тандем» с учетом поддува и влияния струи от движителя – воздушного винта. Вычислительный эксперимент производился в программе ANSYS. Его условия предусматривали изменение кинематических параметров полета и положения экраноплана относительно экрана, скорости и угла выдува струи, углов отклонения рулевых поверхностей и элементов механизации. Анализ результатов позволяет сделать выводы об эффективности применения поддува к данной компоновочной схеме экраноплана, а также выявить основные особенности изменения ее аэродинамических характеристик при различных параметрах струи, конфигурации и положения экраноплана относительно экрана. Также рассмотрены некоторые особенности летно-технических характеристик экраноплана с учетом влияния струй от воздушного винта. Результаты работы могут быть использованы при проектировании экранопланов. Ключевые слова: экраноплан, аэродинамика экраноплана, аэродинамический поддув, динамическая воздушная подушка This paper presents the primary results of the study of the aerodynamic characteristics of a WIG, with due consideration of the blow and the influence of jets from the propeller, using CFD technologies. WIG of the Tandem scheme is considered as the object of this research. The paper presents a simplified technique for modeling a jet from a propeller. The computational experiment for the study of aerodynamic characteristics was carried out in the ANSYS finite element analysis program. The conditions of the computational experiment provided for changing the kinematic parameters (position of the WIG against the screen), speed of the jet, the angle of the jet blow, and use of wing mechanization (flaps). Analysis of the results leads to conclusions on effectiveness of the blowing application to this layout of the WIG. It also allows to reveal major effects from changing its aerodynamic characteristics with various jet parameters, configuration and position of the WIG against the ground. The paper also considers some of the features of WIG flight performance taking into account the effect of jets from the propeller. Keywords: PAR (Power-augmented Ram), GEV (ground-effect vehicle), WIG (wing-in-ground-effect)

Aerodynamic Behavior of a Compound Wing Configuration in Ground Effect

2014 ◽  
Vol 66 (2) ◽  
Author(s):  
Saeed Jamei ◽  
Adi Maimun ◽  
Shuhaimi Mansor ◽  
Agoes Priyanto ◽  
Nor Azwadi ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Ground Effect ◽  
Tip Vortex ◽  
Aerodynamic Coefficients ◽  
Ground Clearance ◽  
Reverse Taper ◽  
Current Experimental Data ◽  
Computational Fluid Dynamics Cfd ◽  
Ram Effect ◽  
Wing In Ground Effect

The aerodynamic coefficients of wing in ground effect can be affected with its design which can be the main parameter for efficiency of wing-in-ground effect craft. In this study, the aerodynamic coefficients of a compound wing were numerically determined in ground effect. The compound wing was divided into three parts with one rectangular wing in the middle and two reverse taper wings with an anhedral angle at the sides. An NACA6409 airfoil was employed as a section of wings. Three dimensional (3D) computational fluid dynamics (CFD) was applied as a numerical scheme. A realizable k-ε turbulent model was used for simulation the turbulent flow around the wing surfaces. For validation purpose, the numerical results of a compound wing with aspect ratio 1.25, at ground clearance of 0.15 and different angles of attack were compared with the current experimental data. Then, the aerodynamic coefficients of the compound wings were computed at various ground clearances and angle of attack of 4°. According to pressure and velocity distribution of air around wing surfaces, ground clearance had considerable effects on ram effect pressure and tip vortex of the compound wing, and aerodynamic coefficients of the compound wing had some improvements as compared with the rectangular wing.

Effect of the Air Duct System of a Simplified Vehicle Model on Aerodynamic Performance

2020 ◽  
Vol 17 (2) ◽  
pp. 7985-7995
Author(s):  
A. W. Huluka ◽  
C. H. Kim
Keyword(s):  
Numerical Study ◽  
Aerodynamic Resistance ◽  
Three Dimensional ◽  
Aerodynamic Characteristics ◽  
Aerodynamic Performance ◽  
Vehicle Model ◽  
Fundamental Study ◽  
Pressure Drag ◽  
Energy Efficiency Improvement ◽  
Simple Body

In this numerical study, ducted Ahmed model is used to study aerodynamic characteristics of ducted models and how ducting would contribute to the energy consumption reduction effort from aerodynamic resistance. Three-dimensional, incompressible, and steady governing equations were solved by commercial software PHOENICS (version 2018) with extended turbulent model proposed by Chen-Kim (1987). The study can be considered as a stepping stone to bring a new approach to design aerodynamically efficient vehicle by ducting target vehicles. To investigate the feasibility of the ducting for aerodynamic energy efficiency improvement, fundamental study has been conducted numerically on a simple body before applying to appropriate vehicle model. It is observed from the study that ducting would reduce over 19% of the pressure drag, to the contrary the increase in skin friction drag is noted although its significance to the total drag is very less compared to pressure drag. Therefore, study of ducting and its effect on aerodynamic performance is expected to contribute to improvement of electric vehicle aerodynamic performance.

21309 Aerodynamic Characteristics of Wing in Ground Effect

2005 ◽  
Vol 2005.11 (0) ◽  
pp. 459-460
Author(s):  
Naoki ARAI ◽  
Toshio IIJIMA ◽  
Hisayuki ENNOJI
Keyword(s):  
Ground Effect ◽  
Aerodynamic Characteristics ◽  
Wing In Ground Effect
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