Abstract
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%.
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Mahdi Nili-Ahmadabadi is Assistant Professor and faculty member of the Department of Mechanical Engineering at Isfahan University of Technology. He received his Master and Ph.D. degrees from Sharif University of Technology in 2005 and 2010, respectively. His major research interests are in the fields of inverse design, turbomachinery, experimental aerodynamics, and PIV measurement.
Farzad Poursadegh, the corresponding author of the paper, is Master of Science graduate from Sharif University of Technology. His major research interests are in the fields of turbomachinery and aerodynamics. He has recently focused on the development of inverse design methods in turbomachinery, especially in compressors. Moreover, he has been the chief specialist in thermo-fluids of oil turbo-compressor equipment since 2010.
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Nili-Ahmadabadi, M., Poursadegh, F. Centrifugal compressor shape modification using a proposed inverse design method. J Mech Sci Technol 27, 713–720 (2013). https://doi.org/10.1007/s12206-013-0120-0
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DOI: https://doi.org/10.1007/s12206-013-0120-0