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Experimental Investigation Of Secondary Flows In A Family Of Three Highly Loaded Low Pressure Turbine Cascades
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Book Synopsis Experimental Investigation of Secondary Flows in a Family of Three Highly Loaded Low-pressure Turbine Cascades by : Tatjana Zorić
Download or read book Experimental Investigation of Secondary Flows in a Family of Three Highly Loaded Low-pressure Turbine Cascades written by Tatjana Zorić and published by . This book was released on 2006 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Controlling Secondary Flows in Very Highly-loaded Low-pressure Turbine Cascades by : Daniel C. Knezevici
Download or read book Controlling Secondary Flows in Very Highly-loaded Low-pressure Turbine Cascades written by Daniel C. Knezevici and published by . This book was released on 2012 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of Heat Transfer in Separated Flow on a Highly Loaded LP Turbine Cascade by :
Download or read book Experimental Investigation of Heat Transfer in Separated Flow on a Highly Loaded LP Turbine Cascade written by and published by . This book was released on 2003 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Today aerodynamic design tools and CFD-codes provide excellent quality in predicting 2D and 3D flows in turbine components. Nevertheless correlation and numerical methods are not able to predict beat flux in a satisfactory accuracy for complex heat transfer problems for example 3D film cooling mixing zones or areas of separated flow. In order to close part of these gaps in knowledge and to improve the understanding of the interaction between the flow pattern and the beat transfer phenomena experimental investigations were carried out focused on 2D separated flow on the pressure side leading edge of the highly loaded low pressure turbine cascade named T106-300. The cascade was instrumented with pressure taps and glue-on hot-film sensors. The pressure taps provided the static profile pressure distribution. The hot-film anemometry technique normally is used to detect boundary layer development; moreover a procedure will be presented to evaluate the heat transfer coefficient as well. Supplementary boundary layer traverses with a 1D hot-wire probe were carried out at positions inside and downstream of the separation. The dimension of the separation tip to 60% chord was varied by the incidence angle. By variation of Reynolds number and Mach number a data set is available which will be put down to a correlation.
Book Synopsis Analysis of Unsteady Secondary Flows in Linear Low-pressure Turbine Cascades by : Roberto Ciorciari
Download or read book Analysis of Unsteady Secondary Flows in Linear Low-pressure Turbine Cascades written by Roberto Ciorciari and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1978 with total page 1008 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Study of Separated Flow Through a Low-pressure Turbine Cascade by :
Download or read book A Study of Separated Flow Through a Low-pressure Turbine Cascade written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Low-pressure turbines (LPT) experience large changes in chord Reynolds number as the turbine engine operates from take-off to cruise conditions. Due to prevailing conditions at high altitude cruise, the Reynolds number reduces drastically. At low Reynolds numbers, the flow is largely laminar and tends to separate easily on the suction surface of the blade, and this laminar separation in particular leads to significant degradation of engine performance due to large re-circulation zones. Therefore, a better understanding of low-Reynolds number flow transition and separation is very critical for an effective design of LPT blade, and in exploring various possibilities for implementing flow control techniques, passive or active, to prevent or delay the flow separation in the low-pressure turbine. The objective of the present study is to understand the three-dimensional flow separation that occurs inside an LPT cascade at very low Reynolds numbers, and a high-order accurate numerical solution procedure is used to attain the same. A multi-block, periodic, structured grid generated by the grid generation software, GRIDPRO, is used to represent the flow domain. A MPI-based higher-order, parallel, chimera version of the FDL3DI flow solver, developed by the Air Force Research Laboratory at Wright Patterson Air Force Base, is extended for the present turbomachinery application. A sixth-order accurate compact-difference scheme is used for the spatial discretization, along with second-order accurate temporal discretization. Up to tenth-order filtering has been applied to minimize the numerical oscillations, and maintain numerical stability. Simulations have been performed for Reynolds numbers (based on inlet velocity and axial chord) 10,000 and 25,000. The effect of these low-Reynolds numbers on the flow physics for a low-pressure turbine cascade has been studied in detail. At Re = 10,000, the flow undergoes more separation than at Re = 25,000 as expected and the separation remains significant over the entire blade for both the Reynolds number. The location of the onset of separation matches with an available LES simulation and with the available experimental data. In addition to the above simulations, another study was carried out to understand the effect of two different sets of inflow/outflow boundary conditions on the flow solution. The two sets of boundary conditions include static inflow with extrapolated outflow (BC1), and dynamic inflow (BC2) that accounts for upstream influence in the subsonic flow. The computed Cp distribution for the LPT flow shows good agreement with the available experimental data. Application of BC2 boundary condition predicted a bounded region of separation, while BC1 boundary condition predicted significant separation over the entire blade of an LPT.
Book Synopsis An Experimental Investigation of Secondary Flow in an Accelerating, Rectangular Elbow with 90 Degrees of Turning by : John D. Stanitz
Download or read book An Experimental Investigation of Secondary Flow in an Accelerating, Rectangular Elbow with 90 Degrees of Turning written by John D. Stanitz and published by . This book was released on 1953 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt: The passage vortex associated with secondary flows appears to be near the suction surface and away from the plane wall of the elbow at the exit and does not have appreciable spanwise motion as it moves downstream the elbow exit. As the spoiler size increases, the boundary-layer form changes and a rather sudden difference in the secondary flow occurs, perhaps associated withthe reduced importance of viscous effects in thick boundary layers. It is suggested that the strength of the secondary vortices is small and that the energy of secondary flows is small.
Download or read book NASA SP. written by and published by . This book was released on 1992 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Paper written by and published by . This book was released on 2001 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 974 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Secondary Flows in Turbomachines by :
Download or read book Secondary Flows in Turbomachines written by and published by . This book was released on 1990 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings contain the 24 papers presented at the meeting on secondary flows in turbomachines. The meeting was arranged in the following sessions: Basic flow phenomena (6); Experimental results (5); Three-dimensional computation and comparison with experiments (5); Tip clearance flows (4); and Secondary flow effects on heat transfer (4). The specialists' meeting offered a forum for experts to discuss computational and experimental methods and results for secondary flow in cascades, compressors and turbines. CFD was found to be an adequate tool to represent qualitative phenomena, but on the accuracy of predicting losses and exit angles there was some disagreement. Many papers dealt with experimental investigations which are obviously essential for evaluating secondary flow models. Keywords: Three dimensional flow computations; Cascade structures; Axial flow compressors; Airfoils; Turbulent flow/mixing; Nozzle guide vanes; Transonic nozzles; Aspect ratio; Centrifugal impellers; Radial compressors; Blade tips; Turbine blades; Cascades fluid dynamics; Compressors; End wall flow; Computational fluid dynamics; Tip leakage flow; Secondary flow; Turbine guide vanes.
Book Synopsis Experimental Investigation of Separation in a Low Pressure Turbine Blade Cascade Model by : Brian Hollon
Download or read book Experimental Investigation of Separation in a Low Pressure Turbine Blade Cascade Model written by Brian Hollon and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723575693 Total Pages :216 pages Book Rating :4.5/5 (756 download)
Book Synopsis Experimental Study of Transitional Flow Behavior in a Simulated Low Pressure Turbine by : National Aeronautics and Space Administration (NASA)
Download or read book Experimental Study of Transitional Flow Behavior in a Simulated Low Pressure Turbine written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-24 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: A detailed investigation of the flow physics occurring on the suction side of a simulated Low Pressure Turbine (LPT) blade was performed. A contoured upper wall was designed to simulate the pressure distribution of an actual LPT airfoil onto a flat lower plate. The experiments were carried out for the Reynolds numbers of 35,000, 70,000, 100,000 and 250,000 with four levels of freestream turbulence ranging from 1% to 4%. For the three lower Reynolds numbers, the boundary layer on the flat plate was separated and formed a bubble. The size of laminar separation bubble was measured to be inversely proportional to the freestream turbulence levels and Reynolds numbers. However, no separation was observed for the Re = 250,000 case. The transition on a separated flow was found to proceed through the formation of turbulent spots in the free shear layer as evidenced in the intermittency profiles for Re = 35,000, 70,000 and 100,000. Spectral data show no evidence of Kelvin-Helmholtz or Tollmien-Schlichting instability waves in the free shear layer over a separation bubble (bypass transition). However, the flow visualization revealed the large vortex structures just outside of the bubble and their development to turbulent flow for Re = 50,000, which is similar to that in the free shear layer (separated-flow transition). Therefore, it is fair to say that the bypass and separated-flow transition modes coexist in the transitional flows over the separation bubble for certain conditions. Transition onset and end locations and length determined from intermittency profiles decrease as Reynolds number and freestream turbulence levels increase. Sohn, Ki Hyeon and DeWitt, Kenneth J. Glenn Research Center NCC3-288...
Download or read book ไหว้ครูดนตรีไทย written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Abstract Bulletin written by and published by . This book was released on 1978 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct Numerical Simulations of the Unsteady Secondary Flow in the Near-wall Region of a Linear Low Pressure Turbine Cascade by : Denis Koschichow
Download or read book Direct Numerical Simulations of the Unsteady Secondary Flow in the Near-wall Region of a Linear Low Pressure Turbine Cascade written by Denis Koschichow and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
