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High Efficiency Design of High Pressure Radial Fan Spiraled Casings Used for Biogas Transport

[+] Author Affiliations
Mihai Miclea, Philipp Epple, Harald Schmidt, Antonio Delgado

Friedrich-Alexander University, Erlangen-Nuremberg, Erlangen, Germany

Hans Russwurm

Russwurm Ventilatoren GmbH, Erlangen, Germany

Paper No. IMECE2009-12521, pp. 1191-1200; 10 pages
doi:10.1115/IMECE2009-12521
From:
  • ASME 2009 International Mechanical Engineering Congress and Exposition
  • Volume 9: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B and C
  • Lake Buena Vista, Florida, USA, November 13–19, 2009
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4382-6 | eISBN: 978-0-7918-3863-1
  • Copyright © 2009 by ASME

abstract

The use of low speed radial impellers is very common for industrial fans and blowers. Some of the applications include fans designed for the transport of biogas in biogas plants. The design process of fans is almost always direct, based on existing impeller series and available experimental data as stated recently in [1]. This paper presents the design results and optimization of low speed/high pressure radial impellers with spiraled casings used for such an application through a combined inverse approach. The aim was to design high efficiency impeller-casing systems for a specified operating point or a specified operating flow range, as well as to adjust the slope of the pressure-flow rate characteristic of the system for the desired high pressure specifications. The design point, and hence the maximum efficiency of these blowers has been set by the manufacturer at very small flow rates implying an iterative design approach of both impeller and casings. Here will be presented how the geometrical design parameters are influencing the performances of such fans. Several casings configurations with and without vaneless diffusers, different tongue radii, design flow rates or casing-impeller height ratios were investigated. They were numerically simulated with a commercial Navier-Stokes CFD solver (ANSYS CFX V11.0) and by evaluating their results an understanding of the inside flow physics could be achieved. To properly filter and analyze the investigated design results of the casings, a new performance parameter was successfully implemented and validated. This performance parameter will be called the casing (or volute) efficiency, and will be explained later in this paper. Results are showing the influences of several geometrical and construction parameters of casings and some backward (reversed) conclusions on impeller design suited to operate in such systems. Finally conclusions are presented, analyzing the suited casing geometries for reaching the desired performances as well as the advantages of this combined analytical and numerical method suited to perform a coupled design of high efficiency spiral casings for radial impellers.

Copyright © 2009 by ASME

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