Download or read book Visualization of Flow Past a Model of the CF 18 Aircraft in a Water Tunnel written by Warren Robert Dunn and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Incompressible flow past a 1:48 scale model of the CF-18 fighter aircraft was studied in a water tunnel at the University of Ottawa. Flow visualization records were obtained for flow around different stores, the Leading Edge Extension (LEX) vortex, and the forebody vortex, at various angles of attack. The stores were mostly studied in the low angle of attack range between $\alpha$ = $-$1$\sp\circ$ and $\alpha$ = 5$\sp\circ$. At these angles, their effect on the flow was local. Decreasing the spacing between stores caused the flow to slow down considerably because of the interaction of the separated flow on the wing with the boundary layers of the individual stores. The LEX vortex became stronger as the angle of attack was increased, and the location of its breakdown moved upstream. The breakdown location showed good correlation with results of other model and full-scale studies. The forebody vortex was weaker than the LEX vortex, and was consistently drawn towards the LEX until the two vortices began interacting. The variation of the LEX vortex bursting location with angle of attack is only weakly sensitive to Reynolds number and, therefore, the water tunnel tests can provide a good simulation of full-scale flow characteristics. On the other hand, flow characteristics near surfaces change substantially with increasing Reynolds number, so that the water tunnel results in such regions must be viewed with reservation, when considering their relevance to the high Reynolds number flow around the aircraft. (Abstract shortened by UMI.).

Download or read book Visualization of Flow Past a Model of the CF 18 Aircraft in a Water Tunnel written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Water tunnel Study Results of a TF A 18 and F A 18 Canopy Flow Visualization written by and published by . This book was released on 1990 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Water Tunnel Flow Visualization Study of the Vortex Flow Structures on the F a 18 Aircraft written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-11-12 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: The vortex flow structures occurring on the F/A-18 aircraft at high angles of attack were studied. A water tunnel was used to gather flow visualization data on the forebody vortex and the wing leading edge extension vortex. The longitudinal location of breakdown of the leading edge vortex was found to be consistently dependent on the angle of attack. Other parameters such as Reynolds number, model scale, and model fidelity had little influence on the overall behavior of the flow structures studied. The lateral location of the forebody vortex system was greatly influenced by changes in the angle of sideslip. Strong interactions can occur between the leading edge extension vortex and the forebody vortex. Close attention was paid to vortex induced flows on various airframe components of the F/A-18. Reynolds number and angle of attack greatly affected the swirling intensity, and therefore the strength of the studied vortices. Water tunnel results on the F/A-18 correlated well with those obtained in similar studies at both full and sub scale levels. The water tunnel can provide, under certain conditions, good simulations of realistic flows in full scale configurations. Sandlin, Doral R. and Ramirez, Edgar J. Unspecified Center FLOW DISTRIBUTION; FLOW VISUALIZATION; HYDRAULIC TEST TUNNELS; LEADING EDGES; VORTICES; WING PROFILES; AIRFRAMES; ANGLE OF ATTACK; FOREBODIES; REYNOLDS NUMBER; SCALE MODELS; SIDESLIP; SWIRLING...

Download or read book Water Tunnel Study Results of a Tf A 18 and F A 18 Canopy Flow Visualization written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-15 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: A water tunnel study examining the influence of canopy shape on canopy and leading edge extension flow patterns was initiated. The F/A-18 single-place canopy model and the TF/A-18 two place canopy model were the study subjects. Plan view and side view photographs showing the flow patterns created by injected colored dye are presented for 0 deg and 5 deg sideslip angles. Photographs taken at angle of attack and sideslip conditions correspond to test departure points found in flight test. Flight experience has shown that the TF/A-18 airplane departs in regions where the F/A-18 airplane is departure-resistant. The study results provide insight into the differences in flow patterns which may influence the resulting aerodynamics of the TF/A-18 and F/A-18 aircraft. It was found that at 0 deg sideslip, the TF/A-18 model has more downward flow on the sides of the canopy than the F/A-18 model. This could be indicative of flow from the leading edge extension (LEX) vortexes impinging on the sides of the wider TF/A-18 canopy. In addition, the TF/A-18 model has larger areas of asymmetric separated and unsteady flow on the LEXs and fuselage, possibly indicating a lateral and directional destabilizing effect at the conditions studied. Johnson, Steven A. and Fisher, David F. Armstrong Flight Research Center RTOP 533-02-01...

Download or read book A Water Tunnel Flow Visualization Study of the Vortex Flow Structures on the F A 18 Aircraft written by Edgar J. Ramirez and published by . This book was released on 1990 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Navier Stokes Flight and Wind Tunnel Flow Analysis for the F A 18 Aircraft written by Farhad Ghaffari and published by . This book was released on 1994 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Introduction to Aerospace Engineering with a Flight Test Perspective written by Stephen Corda and published by John Wiley & Sons. This book was released on 2017-03-20 with total page 931 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive textbook which introduces the fundamentals of aerospace engineering with a flight test perspective Introduction to Aerospace Engineering with a Flight Test Perspective is an introductory level text in aerospace engineering with a unique flight test perspective. Flight test, where dreams of aircraft and space vehicles actually take to the sky, is the bottom line in the application of aerospace engineering theories and principles. Designing and flying the real machines are often the reasons that these theories and principles were developed. This book provides a solid foundation in many of the fundamentals of aerospace engineering, while illuminating many aspects of real-world flight. Fundamental aerospace engineering subjects that are covered include aerodynamics, propulsion, performance, and stability and control. Key features: Covers aerodynamics, propulsion, performance, and stability and control. Includes self-contained sections on ground and flight test techniques. Includes worked example problems and homework problems. Suitable for introductory courses on Aerospace Engineering. Excellent resource for courses on flight testing. Introduction to Aerospace Engineering with a Flight Test Perspective is essential reading for undergraduate and graduate students in aerospace engineering, as well as practitioners in industry. It is an exciting and illuminating read for the aviation enthusiast seeking deeper understanding of flying machines and flight test.

Download or read book Thermal and Flow Measurements written by T.-W. Lee and published by CRC Press. This book was released on 2008-04-09 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermal and flow processes are ubiquitous in mechanical, aerospace and chemical engineering systems. Experimental methods including thermal and flow diagnostics are therefore an important element in preparation of future engineers and researchers in this field. Due to the interdisciplinary nature of experimentation, a fundamental guidance book is e

Download or read book Flow Visualization Water Tunnel written by G. A. Dobrodzicki and published by . This book was released on 1982 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: The intention of this report is to demonstrate the utility of theflow visualization water tunnel in the field of experimentalfluid dynamics and also provide guidance to its prospectiveusers. A brief description of the facility and its ancillaryequipment is followed by a short description of the flowvisualization techniques. To emphasize the diversity of subjectstested in the water tunnel, a list of typical experiments and anumber of photographs are presented.

Download or read book NASA Technical Memorandum written by and published by . This book was released on 1990 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aeronautical Engineering written by and published by . This book was released on 1991 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NASA Scientific and Technical Publications written by and published by . This book was released on 1987 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Government Reports Annual Index written by and published by . This book was released on 1991 with total page 1662 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Flow Visualization Study of LEX Generated Vortices on a Scale Model of F A 18 Fighter Aircraft at High Angles of Attack written by and published by . This book was released on 1990 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: A water tunnel flow visualization investigation was performed into the high angle of attach aerodynamics of a 2% scale model of the F/A-18 fighter aircraft. The main focus of this study was the effect of pitch rate on the development and bursting of vortices generated from the leading edge extension in the high angle of attack range with and without yaw. Results of this investigation indicate that the vortex bursting point (relative to the static case) moves rearward with increasing pitch-up motion and forward with increasing pitch-down motion. For the same pitch rate, vortex bursting was found to occur earlier for the pitch-down motion than for the pitch-up motion, implying aerodynamic hysteresis effects. Yawing the model generated significant vortex asymmetries due to the delayed vortex breakdown on the leeward side for yaw angles of less than 10 deg. The presence of these asymmetric vortices led to undesirable side forces and yawing moments.

Download or read book Flow Visualization of the Effect of Pitch Rate on the Vortex Development on the Scale Model of a F 18 Fighter Aircraft written by Sung-Nam Park and published by . This book was released on 1989 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments were performed in a water tunnel to visualize the vortex bursting phenomenon on a 1/48th scale model of the F-18 fighter aircraft. Photographs were taken to investigate the effect of pitch rate and yawing on bursting locations of vortices shed from the forebody and the strake during simple pitch up and simple pitch down maneuvers in an angle of attack range up to 50 degrees. It was found that the vortex burst point moves upstream with increasing pitch rate. At the same pitch rate, vortex bursting was usually found to occur earlier for the pitch-down than for the pitch-up maneuver. Aircraft yawing generated significant vortex asymmetries due to earlier vortex bursting on the windward side thus leading to undesireable side forces and yawing moments. Keywords: Fluid dynamics; Aerodynamics. (KT).