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Parametric Study Of Aerodynamic Performance Of An Airfoil With Active Circulation Control Using Leading Edge Embedded Cross Flow Fan
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Book Synopsis Parametric Study of Aerodynamic Performance of an Airfoil with Active Circulation Control Using Leading Edge Embedded Cross-flow Fan by : M A Qayyum Mazumder
Download or read book Parametric Study of Aerodynamic Performance of an Airfoil with Active Circulation Control Using Leading Edge Embedded Cross-flow Fan written by M A Qayyum Mazumder and published by . This book was released on 2018 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: A concept of a cross-flow fan (CFF) embedded near the leading edge of an airfoil to actively control the boundary layer for lift and thrust enhancement has been proposed. The design places a cross-flow fan near the leading edge of an airfoil and flow is drawn in from the pressure side of the airfoil, energized and expelled out to the suction side near the leading edge. This CFF system simulates the active boundary layer control by blowing commercial computational fluid dynamics (CFD) code ANSYS Fluent is employed to perform 2-D calculations based on various parameters of the CFF and compared the data with an experimental baseline case found in literature. The effect of number of blades, pressure side slat opening, suction side slat angle, hub-to-shroud ratio and blade pitch angle have on aerodynamic parameters have been investigated. Regression models are established using the acquired data to find combination of parameters for achieving higher circulation control. Unsteady sliding mesh method is used to carry out the numerical simulation. The fan geometry is developed and housed in a NACA 651-212 airfoil. The of the CFD work show that the jet leaving the fan replaces the boundary layer of the upstream flow with a flow of very high velocity. This high velocity flow causes a higher pressure difference between the suction and the pressure side generating higher lift in the process. The drag of the airfoil is overcame and a net thrust is observed by CFF blowing phenomenon.
Book Synopsis Experimental Validation of Embedded Cross-flow Fan Propulsive/circulation Control Airfoil by : Ryan K. Dygert
Download or read book Experimental Validation of Embedded Cross-flow Fan Propulsive/circulation Control Airfoil written by Ryan K. Dygert and published by . This book was released on 2005 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical and Experimental Investigation of Performance Improvements of a Cross-flow Fan by : Vlassios Antoniadis
Download or read book Numerical and Experimental Investigation of Performance Improvements of a Cross-flow Fan written by Vlassios Antoniadis and published by . This book was released on 2010 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt: The cross-flow fan has an inherent ability to provide thrust to an airfoil as well as provide boundary layer control. The thrust can be easily vectored and usually the cross-flow fan is fully embedded within the airfoil, making its operation relatively safe. Those characteristics make it very favorable as a propulsive means for a vertical takeoff and landing (VTOL) aircraft. However, further design improvements are needed for competitive comparison with existing conventional aircraft propulsion methods. The baseline configuration was scaled from a 12-inch diameter, 30-bladed rotor developed by Vought Systems in the 1970s to a 6-inch rotor as a more realistic size for integration into a propulsive wing. Using the computational fluid dynamics (CFD) software, ANSYS CFX, previous baseline configuration models were validated at full-speed range to verify the software's prediction. Then, a model with the cross-flow fan embedded at the trailing edge was built and different configurations were examined. An attempt was made to improve the performance of the cross-flow fan embedded airfoil by thrust and thrust-to-power ratio, and lift and drag forces were calculated. CFD results have shown that a rotor with fewer blades can improve performance and a 22-bladed rotor was selected and examined experimentally. Results were compared with the baseline 30-bladed rotor.
Book Synopsis Enhancing the Aerodynamic Performance of Stepped Airfoils by : Ranganadhan Voona
Download or read book Enhancing the Aerodynamic Performance of Stepped Airfoils written by Ranganadhan Voona and published by . This book was released on 2012-10-26 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The main objective of this research was to investigate the lift and drag characteristics of a stepped airfoil with backward facing steps; apply active flow control technique to enhance the aerodynamic performance of stepped airfoils and examine the possibility of using such airfoils on Unmanned Aerial Vehicles (UAV's). A step was introduced at mid-chord, with a depth of 50% of the airfoil thickness at mid-chord position extending till the trailing edge of a NACA 4415 airfoil. Computational studies were conducted with the use of passive flow control constituting the activation of step and active flow control with the use of air injecting jets placed in the step cavity of the NACA 4415 airfoil with a goal of enhancing the aerodynamic performance. The jet angle and jet momentum coefficient were varied independently to identify the best setting for optimizing the aerodynamic performance of the stepped airfoil. Experimental studies of a scaled wing model with the same airfoil were conducted in a wind tunnel for a range of Reynolds numbers to validate some of the numerical results obtained for the cases of base and stepped airfoils. The results produced show that as much as 37% increase in C1 and as much as 12% increase in L/D ratios over conventional airfoil values could be obtained using stepped airfoils and further enhancement could be made with the employment of jets placed in the step cavities. The case study conducted as a part of this research focuses on the UAV RQ-2 Pioneer employing a stepped airfoil configuration by comparing its aerodynamic characteristics with the conventional NACA 4415 airfoil originally used on this aircraft. The primary objective of the case study was to identify and outline a step schedule for the flight envelope of the UAV Pioneer using a stepped airfoil configuration while applying active flow control to obtain enhanced aerodynamic performance over conventional NACA 4415 airfoil originally used and hence improve the flight performance characteristics like Range and Endurance of the aircraft"--Abstract, p. iii
Book Synopsis The Aerodynamic Characteristics of an Airfoil Utilizing Boundary Layer and Circulation Control by : Edward Milton Boothe
Download or read book The Aerodynamic Characteristics of an Airfoil Utilizing Boundary Layer and Circulation Control written by Edward Milton Boothe and published by . This book was released on 1965 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was conducted to investigate experimentally the change in airfoil characteristics brought about by the simultaneous application of boundary layer control through leading edge blowing and circulation control through trailing edge suction, to detect the changes in lift resulting from leading edge blowing, to determine if any benefit could be derived by simultaneously applying trailing edge suction at a mass flow rate equal to that of the blowing, and to investigate the associated changes in pressure drag and pitching moment.
Book Synopsis Recent Development of Aerodynamic Design Methodologies by : Kozo Fujii
Download or read book Recent Development of Aerodynamic Design Methodologies written by Kozo Fujii and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational Fluid Dynamics (CFD) has made remarkable progress in the last two decades and is becoming an important, if not inevitable, analytical tool for both fundamental and practical fluid dynamics research. The analysis of flow fields is important in the sense that it improves the researcher's understanding of the flow features. CFD analysis also indirectly helps the design of new aircraft and/or spacecraft. However, design methodologies are the real need for the development of aircraft or spacecraft. They directly contribute to the design process and can significantly shorten the design cycle. Although quite a few publications have been written on this subject, most of the methods proposed were not used in practice in the past due to an immature research level and restrictions due to the inadequate computing capabilities. With the progress of high-speed computers, the time has come for such methods to be used practically. There is strong evidence of a growing interest in the development and use of aerodynamic inverse design and optimization techniques. This is true, not only for aerospace industries, but also for any industries requiring fluid dynamic design. This clearly shows the matured engineering need for optimum aerodynamic shape design methodologies. Therefore, it seems timely to publish a book in which eminent researchers in this area can elaborate on their research efforts and discuss it in conjunction with other efforts.
Book Synopsis Aerodynamic Analysis of Blunt Trailing Edge Airfoils & a Micro-based Load Control System by : Kevin James Standish
Download or read book Aerodynamic Analysis of Blunt Trailing Edge Airfoils & a Micro-based Load Control System written by Kevin James Standish and published by . This book was released on 2003 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of a Circulation Control Airfoil with Leading/trailing Edge Blowing by : B.G. McLachlan
Download or read book A Study of a Circulation Control Airfoil with Leading/trailing Edge Blowing written by B.G. McLachlan and published by . This book was released on 1987 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Approach to Constrained Aerodynamic Design with Application to Airfoils by : Richard Lawson Campbell
Download or read book An Approach to Constrained Aerodynamic Design with Application to Airfoils written by Richard Lawson Campbell and published by . This book was released on 1992 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Airfoil Design and Data by : Richard Eppler
Download or read book Airfoil Design and Data written by Richard Eppler and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 569 pages. Available in PDF, EPUB and Kindle. Book excerpt: This detailed book describes a procedure for the design and analysis of subsonic airfoils. Contains 116 new airfoils for a wide range of Reynolds numbers and application requirements, including the input data for the computer code.
Book Synopsis Aerodynamic Characteristics of a Large Number of Airfoils Tested in the Variable-density Wind Tunnel by : Isadore Edward Garrick
Download or read book Aerodynamic Characteristics of a Large Number of Airfoils Tested in the Variable-density Wind Tunnel written by Isadore Edward Garrick and published by . This book was released on 1938 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental and Computational Investigation of Oscillating Airfoil Unsteady Aerodynamics at Large Mean Incidence by :
Download or read book An Experimental and Computational Investigation of Oscillating Airfoil Unsteady Aerodynamics at Large Mean Incidence written by and published by DIANE Publishing. This book was released on 2003 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Aerodynamics of Circulation Control Aerofoils by : N. J. Wood
Download or read book The Aerodynamics of Circulation Control Aerofoils written by N. J. Wood and published by . This book was released on 1981 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study on the Vortex Wake of an Airfoil Equipped with Flexible Trailing Edge Fringes by : Zhengkai He
Download or read book Study on the Vortex Wake of an Airfoil Equipped with Flexible Trailing Edge Fringes written by Zhengkai He and published by . This book was released on 2014 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the inspiration of owl's silent flight, a traditional airfoil S833 equipped with flexible fringes on the trailing edge is investigated through numerical simulation and experiments in a wind tunnel. The newly constructed airfoil is modeled and numerically investigated. An incompressible, 2D and viscous flow solver in the Computational Fluid Dynamics (CFD) software FLUENT is utilized to conduct the numerical simulation on the vortex flow feature in the wake of the airfoil. A User Defined Function code was applied to generate the defined motion of flexible fringes. The effects of the flapping frequency of the fringe and the deformation pattern of the fringe are investigated in the parametric study. On the other hand, the airfoil model with the flexible fringe is manufactured for the experimental study. A digital Particle Image Velocimetry (PIV) system is employed to investigate the flow structure in the wake and the deformation of the flexible fringes. The motion of the trailing edge fringes is extracted from the experimental measurements as the input for CFD simulation. It has been found that the addition of the flexible fringe has a significant effect on the flow characteristics in the vortex wake downstream of the airfoil as well as the aerodynamic performance of the airfoil.
Book Synopsis Extension of the Theory of Oscillating Airfoils of Finite Span in Subsonic Compressible Flow by : Eric Reissner
Download or read book Extension of the Theory of Oscillating Airfoils of Finite Span in Subsonic Compressible Flow written by Eric Reissner and published by . This book was released on 1951 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: As part of an investigation of flows around and forces on an oscillating finite wing in subsonic compressible flow, the exact double integrals occurring in the theoretical formulation of the three-dimensional nonstationary aerodynamic forces have previously been reduced to single integrals over the range of either one of the two independent variables. The present report describes a method for solving the resultant three-dimensional problem based on a generalization of approximate methods for solving two-dimensional problems. It is shown that the calculation of three-dimensional corrections to the two-dimensional integral equation for spanwise variation of circulation, provided tabulated values for the kernal of the integral equation are available.
Book Synopsis Special Course on Inverse Methods for Airfoil Design for Aeronautical and Turbomachinery Applications by :
Download or read book Special Course on Inverse Methods for Airfoil Design for Aeronautical and Turbomachinery Applications written by and published by . This book was released on 1990 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This lecture series is devoted to major aspects of aerofoil design both for aeronautical and turbomachine application. These include: (1) optimisation of target pressure and velocity distribution. Both direct optimisation resulting from an inverse boundary layer calculation and an iterative optimisation of the loses are presented. (2) aerofoil design by means of inverse methods. This ranges from simple parametric definitions of two- dimensional cross sections to a detailed numerical definition of three dimensional shapes. blade or airfoil designs are normally made in two steps, and the lectures are accordingly grouped into two parts. First, optimisation of target pressure and velocity distributions are discussed taking into account the required performance and the lost mechanisms in the boundary layer. Both direct optimisation resulting from an inverse boundary layer calculation, and an iterative optimisation by minimisation of the losses are presented. It is clear from both procedures that inclusion of off-design operation is one of the greatest difficulties involved in blade or airfoil operation. The second part gives an overview of the numerous inverse blade design methods that have been developed both for turbomachinery and aeronautical applications. This ranges from simple parameter definitions of two-dimensional cross-sections to the full three-dimensional definition of wings and blade channels."--DTIC.
Book Synopsis Mathematical Methods of Airfoil Design by : Alexander M. Elizarov
Download or read book Mathematical Methods of Airfoil Design written by Alexander M. Elizarov and published by Wiley-VCH. This book was released on 1997-07-15 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Devoted to the theory of aerodynamic design of subsonic airfoils. It presents the results of more than thirty years research in Russia as well as research by new authors. The state-of-the-art situation in this theory is fully reflected.
