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Saturday, August 8, 2020 | History

3 edition of Numerical analysis of flow through oscillating cascade sections found in the catalog.

Numerical analysis of flow through oscillating cascade sections

Numerical analysis of flow through oscillating cascade sections

  • 144 Want to read
  • 6 Currently reading

Published by National Aeronautics and Space Administration, For sale by the National Technical Information Service in [Washington, DC], [Springfield, Va .
Written in English

    Subjects:
  • Viscous flow.,
  • Unsteady flow (Aerodynamics)

  • Edition Notes

    StatementDennis L. Huff.
    SeriesNASA technical memorandum -- 101417.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15286018M

    Numerical Comparison of the Flow through an Axial Turbine Row: Linear Cascade vs. Annular Cascade section focuses on the mesh quality. The derivation of the data of the boundary investigate the differences in the flow between the linear cascade and the annular cascades. Chapter 6 presents the results of the CFD simulation, and Chapter 7. The overall flow rate is simply the sum of all the individual flow rates through the microcracks at a particular cross section Γ with area A [m 2] of the microcracked material (Fig. 1). In the lattice L z, the flow rate can be computed by a summation of the flow rates through a set of bonds B ′ ⊂ B (Fig. 2) as.

    @article{osti_, title = {Euler solutions for transonic oscillating cascade flows using dynamic triangular meshes}, author = {Hwang, C J and Yang, S Y}, abstractNote = {The modified total-variation-diminishing scheme and an improved dynamic triangular mesh algorithm are presented to investigate the transonic oscillating cascade flows. Gap and Open Lane Effects on Flow-Induced Vibrations of Tube Bundles." Journal of Nuclear Engineering and Design, Vol. , pp. , Huff, D.L., "Numerical Analysis of Flow Through Oscillating Cascade Sections,” Journal of Propulsion and Power, Volume 8, Number 4, July-August , pp.

    2 days ago  In recent years, the H-rotor vertical-axis turbine has attracted considerable attention in the field of wind and tidal power generation. After a series of complex spatiotemporal evolutions, the vortex shed from turbine blades forms a turbulent wake with a multi-scale coherent structure. An analysis of the wake characteristics of twin turbines forms the basis of array optimisation. 2. Suppression of Cascade Flutter with Piezoelectric Device Numerical Analysis A developed code of flow-structure coupling method was used for the numerical analysis. The unsteady aerodynamic force acted on all blades was calculated in the flow computation based on .


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Numerical analysis of flow through oscillating cascade sections Download PDF EPUB FB2

Numerical analysis of supersonic flow through oscillating cascade sections by using a deforming grid. Numerical analysis of flow through oscillating cascade sections. DENNIS HUFF; 27th Aerospace Sciences Meeting August A Navier-Stokes analysis of a controlled-diffusion compressor cascade at increasing inlet-flow angles.

Get this from a library. Numerical analysis of supersonic flow through oscillating cascade sections by using a deforming grid. [Dennis L Huff; T S R Reddy; United. Get this from a library. Numerical analysis of flow through oscillating cascade sections.

[Dennis L Huff; United States. National Aeronautics and Space Administration.]. The present research focuses on numerical solutions of the Euler and Navier-Stokes equations using an ADI procedure to model two-dimensional, transonic flow through oscillating cascades.

The model prescribes harmonic pitching motions for the blade sections for Author: Dennis L. Huff. NUMERICAL ANALYSIS OF SUPERSONIC FLOW THROUGH OSCILLATING CASCADE SECTIONS BY USING A DEFORMING GRID Dennis L. Huff National Aeronautics and Space Administration Lewis Research Center Cleveland, Ohio and TAR Reddy * The University of Toledo Toledo.

Ohio Summary A finite difference code has been developed for modeling. Numerical results demonstrate that nonlinear effects are very effectively modeled by the nonlinear harmonic method. A Linearized Euler Analysis of Unsteady Transonic Flows in Turbomachinery Huff, D.

L., and Reddy, T. R.,“Numerical Analysis of Supersonic Flow Through Oscillating Cascade Sections by Using a Deforming Grid. Author of Unsteady-flow-field predic[t]ions for oscillating cascades, Analysis of viscous transonic flow over airfoil sections, Numerical simulations of unsteady, viscous, transonic flow over isolated and cascaded airfoils using a deforming grid, Numerical simulations of supersonic flow through oscillating cascade sections, Numerical analysis of flow through oscillating cascade sections.

The intent is to validate this nonlinear analysis partially for blade flutter applications via numerical results for benchmark unsteady flows, and to demonstrate this analysis for a realistic fan rotor. and Reddy, T. R.,“Numerical Analysis of Supersonic Flow Through Oscillating Cascade Sections by Using a Deforming Grid,” AIAA.

The unsteady flow field around an oscillating cascade of flat plates with zero stagger is investigated using a time-marching Euler code. This case has an exact solution based on linear theory and serves as a model problem to study pressure wave propagation in the numerical solution.

The objective of this paper is the numerical analysis and prediction of unsteady quasi 3D flow through turbomachinery cascades with vibrating blades. The developed numerical algorithm SAFES1 solves the fully nonlinearized Navier Stokes equations on S 1 stream surfaces.

It is able to cope with shock waves and areas of separation in laminar or. A brief description of the general features of oscillating flow is given in section Various investigators such as Mair [46], Crawford [58], Daniels and Yoshihara [52], Maull [56], Album [51], Eggers and Hermach [61], Bestall and Turner [62], and Hunt [48], etc., observed oscillating flows on axially symmetric bodies at zero and non-zero angles of attack.

NUMERICAL ANALYSIS OF FLOW TtlROUGlt OSCILLATING CASCADE SECTIONS Dennis L. Huff National Aeronautics and Space Administration Lewis Research Center Cleveland, Ohio A compressible, Euler or full Navier-Stokes, finite difference code has been developed for modeling inviscid and viscous flow through oscillating cascades.

[5]. A numerical analysis method with flow-structure coupling was developed to capture the flutter phenomena and to analyze control techniques. From the results by the developed method so far, the well-known flutter suppression by mistuning effect could properly be simulated in the subsonic flow condition.

In a transonic cascade. Aeroelasticity at Reversed Flow Conditions – Part 1: Numerical and Experimental Investigations of a Compressor Cascade with Controlled Vibration. Schönenborn; V. Chenaux; P. Ott. ASME Turbo ExpoPower for Land, Sea & Air, Vancouver, CAN, June The paper refers to the analysis of interactions between the impeller and the vaned diffuser on the air model of a radial flow pump.

The study deals with a numerical simulation of the flow for a. Numerical Solution of Periodic Transonic Flow through a Fan Stage.

Numerical Flow Analysis of a Partial Admission Turbine Using a Frozen Rotor Method. Journal of Fluid Machinery, Vol. 7, No. 6 Single-passage Euler analysis of oscillating cascade aerodynamics for arbitrary interblade phase.

Numerical Analysis of Self-Excited Oscillations of Blade Rows of a Turbomachine in a Three-Dimensional Viscous Gas Flow, " in: Power and Thermal Processes and. The numerical simulation results of the wet-stream flow in turbine cascades obtained by the isogeometric finite volume method is presented in this section.

In the following graphs, the ratio x ∕ x c is starting from the leading edge (x = 0) of the blade and normalized with respect to the x -position of the trailing edge (x c).

The steady fluid flow that is initiated by a cascade of cylinders, which oscillates harmonically in an unbounded, incompressible, viscous fluid that is otherwise at rest, is investigated, both numerically and experimentally. Finite‐difference techniques are used to obtain the numerical solutions, and the streaming flow results show a reasonable agreement with the experimental data.

We present a comprehensive study of the frequency-dependent sensitivity for measurements of the AC elastocaloric effect by applying both exactly soluble models and numerical methods to the oscillat.

Numerical analysis of oscillating flow around a cylinder 63 tions, and presented only as 0 and 26 Hz. The data obtained from the simulation: the average longitudinal (Figs.

2, 4) and transverse velocity profiles (Figs. 3, 5) in the wake behind the cylinder in selected sections: x/D = 2, x/D = 4 and x/D = 6 were summarized with experimental data.This paper presents results obtained from a numerical solution to a stream function–vorticity formulation of the Navier–Stokes equations for the flow around a circular cylinder in planar oscillating flow at small Keulegan–Carpenter numbers (KC) in the subcritical Reynolds number (Re) equations are solved by finite-difference methods.al.

[16] conducted direct numerical simulations of the flow through regular porous media consisting of equally sized, staggered square cylinders. They found that the pressure drop dominates and the entrance and exit effects are negligible. Pamuk and Özdemir [17] stressed in their book section that it is.