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Centrifugal compressor shape modification using a proposed inverse design method

Nili Ahmadabadi, M ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1007/s12206-013-0120-0
  3. Publisher: 2013
  4. Abstract:
  5. This paper is concerned with a quasi-3D design method for the radial and axial diffusers of a centrifugal compressor on the meridional plane. The method integrates a novel inverse design algorithm, called ball-spine algorithm (BSA), and a quasi-3D analysis code. The Euler equation is solved on the meridional plane for a numerical domain, of which unknown boundaries (hub and shroud) are iteratively modified under the BSA until a prescribed pressure distribution is reached. In BSA, unknown walls are composed of a set of virtual balls that move freely along specified directions called spines. The difference between target and current pressure distributions causes the flexible boundary to deform at each modification step. In validating the quasi-3D analysis code, a full 3D Navier-Stokes code is used to analyze the existing and designed compressors numerically. Comparison of the quasi-3D analysis results with full 3D analysis results shows viable agreement. The 3D numerical analysis of the current compressor shows a huge total pressure loss on the 90° bend between the radial and axial diffusers. Geometric modification of the meridional plane causes the efficiency to improve by about 10%
  6. Keywords:
  7. 90° bend ; Centrifugal compressor ; Inverse design ; Meridional plane ; Quasi-3D ; 3-D numerical analysis ; Flexible boundaries ; Inverse design methods ; Inverse designs ; Meridional planes ; Shape modification ; Total-pressure loss ; Algorithms ; Design ; Euler equations ; Iterative methods ; Navier Stokes equations ; Pressure distribution ; Three dimensional computer graphics ; Centrifugal compressors
  8. Source: Journal of Mechanical Science and Technology ; Volume 27, Issue 3 , 2013 , Pages 713-720 ; 1738494X (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs12206-013-0120-0