Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722911621
Total Pages : 110 pages
Book Rating : 4.9/5 (116 download)
Book Synopsis A Study of the Compressible Flow Through a Diffusing S-Duct by : National Aeronautics and Space Administration (NASA)
Download or read book A Study of the Compressible Flow Through a Diffusing S-Duct written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-17 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: Benchmark aerodynamic data are presented for compressible flow through a representative S-duct configuration. A numerical prediction of the S-duct flow field, obtained from a subsonic parabolized Navier-Stokes algorithm, is also shown. The experimental and numerical results are compared. Measurements of the three-dimensional velocity field, total pressures, and static pressures were obtained at five cross-sectional planes. Aerodynamic data were gathered with calibrated pneumatic probes. Surface static pressure and surface flow visualization data were also acquired. All reported tests were conducted with an inlet centerline Mach number of 0.6. The Reynolds number, based on the inlet centerline velocity and duct inlet diameter, was 2.6 x 10(exp 6). Thin inlet turbulent boundary layers existed. The collected data should be beneficial to aircraft inlet designers and the measurements are suitable for the validation of computational codes. The results show that a region of streamwise flow separation occurred within the duct. Details about the separated flow region, including mechanisms which drive this complicated flow phenomenon, are discussed. Results also indicate that the duct curvature induces strong pressure driven secondary flows. The cross flows evolve into counter-rotating vortices. These vortices convect low momentum fluid of the boundary layer toward the center of the duct, degrading both the uniformity and magnitude of the total pressure profile. Wellborn, Steven R. and Okiishi, Theodore H. and Reichert, Bruce A. Glenn Research Center COMPRESSIBLE FLOW; COMPUTATIONAL FLUID DYNAMICS; DUCTED FLOW; FLOW DISTRIBUTION; NAVIER-STOKES EQUATION; PRESSURE DISTRIBUTION; SUBSONIC FLOW; THREE DIMENSIONAL MOTION; VELOCITY DISTRIBUTION; WIND TUNNEL TESTS; BOUNDARY LAYER SEPARATION; CROSS FLOW; FLOW VISUALIZATION; INLET FLOW; REYNOLDS NUMBER; STAGNATION PRESSURE; STATIC PRESSURE; TURBULENT BOUNDARY LAYER; VORTICES...