A Finite-Element-Based Perturbation Model for the Rotordynamic Analysis of Shrouded Pump Impellers
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Home > Reference > Research and information: general > Research methods: general > A Finite-Element-Based Perturbation Model for the Rotordynamic Analysis of Shrouded Pump Impellers: Part 2: User's Guide
A Finite-Element-Based Perturbation Model for the Rotordynamic Analysis of Shrouded Pump Impellers: Part 2: User's Guide

A Finite-Element-Based Perturbation Model for the Rotordynamic Analysis of Shrouded Pump Impellers: Part 2: User's Guide


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About the Book

This report describes the computational steps involved in executing a finite-element-based perturbation model for computing the rotor dynamic coefficients of a shrouded pump impeller or a simple seal. These arise from the fluid/rotor interaction in the clearance gap. In addition to the sample cases, the computational procedure also applies to a separate category of problems referred to as the 'seal-like' category. The problem, in this case, concerns a shrouded impeller, with the exception that the secondary, or leakage, passage is totally isolated from the primary-flow passage. The difference between this and the pump problem is that the former is analytically of the simple 'seal-like' configuration, with two (inlet and exit) flow-permeable stations, while the latter constitutes a double-entry / double-discharge flow problem. In all cases, the problem is that of a rotor clearance gap. The problem here is that of a rotor excitation in the form of a cylindrical whirl around the housing centerline for a smooth annular seal. In its centered operation mode, the rotor is assumed to give rise to an axisymmetric flow field in the clearance gap. As a result, problems involving longitudinal or helical grooves, in the rotor or housing surfaces, go beyond the code capabilities. Discarding, for the moment, the pre- and post-processing phases, the bulk of the computational procedure consists of two main steps. The first is aimed at producing the axisymmetric 'zeroth-order' flow solution in the given flow domain. Detailed description of this problem, including the flow-governing equations, turbulence closure, boundary conditions, and the finite-element formulation, was covered by Baskharone and Hensel. The second main step is where the perturbation model is implemented, with the input being the centered-rotor 'zeroth-order' flow solution and a prescribed whirl frequency ratio (whirl frequency divided by the impeller speed). The computational domain, in the latter case, is treated ...


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Product Details
  • ISBN-13: 9781722131906
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 279 mm
  • No of Pages: 76
  • Spine Width: 4 mm
  • Weight: 200 gr
  • ISBN-10: 172213190X
  • Publisher Date: 02 Jul 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Sub Title: Part 2: User's Guide
  • Width: 216 mm


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A Finite-Element-Based Perturbation Model for the Rotordynamic Analysis of Shrouded Pump Impellers: Part 2: User's Guide
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