Three-Dimensional Unsteady Turbomachinery Flow Analysis

Abstract

A Loosely Couple Blade Row (LCBR) numerical method is developed to analyze the unsteady flow field of a three-dimensional multi-blade-row turbomachinery problem. This method allows the use of initial blade numbers for unsteady calculation and only one blade channel per blade row is used. Circumferential average approach to obtain a converged steady solution as the initial condition is adopted for unsteady calculation. Relatively, it not only maintains the blade configuration, but is also computationally more efficient. The numerical method used is a compressible viscous finite volume algorithm solving Reynolds averaged Navier-Stokes equations. Artificial dissipation terms similar to that used by Jameson is adopted to suppress the numerical oscillations. Four-Stage Runge-Kutta scheme is used to advance the flow equations in time. Residual smoothing and multi-grid techniques are employed to accelerate the convergence. Baldwin and Lomax algebraic turbulent model is used for the calculation of eddy viscosity. The UTRC (United Technologies Research Center) large scale turbine is used here as the test case. The unsteady flow predicted correlates well with data. The results indicate that the unsteady turbomachinery flowfield can be solved with single flow channel of unequal pitch on each blade row.

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Document Details

Document Type
Technical Report
Publication Date
Sep 10, 1999
Accession Number
ADA373334

Entities

People

  • L. C. Lee
  • Shu‐Hsia Chen

Organizations

  • National Cheng Kung University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Boundary Layer
  • Computational Fluid Dynamics
  • Computational Science
  • Convergence
  • Dissipation
  • Equations
  • Flow
  • Flow Fields
  • Fluid Flow
  • Geometry
  • Molecular Dynamics
  • Navier Stokes Equations
  • Pressure Distribution
  • Steady State
  • Three Dimensional
  • Turbomachinery
  • Unsteady Flow

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Fluid Mechanics and Fluid Dynamics.