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Gas Turbines: Microturbines and Small Turbomachinery

Effects of Manufacturing Noise on Microturbine Centrifugal Impeller Performance

[+] Author and Article Information
A. Javed

 Delft University of Technology, Process and Energy Department, Leeghwaterstraat 44, 2628 CA Delft, The Netherlandsa.javed@tudelft.nl

R. Pecnik

 Delft University of Technology, Process and Energy Department, Leeghwaterstraat 44, 2628 CA Delft, The Netherlandsr.pecnik@tudelft.nl

M. Olivero

 Delft University of Technology, Process and Energy Department, Leeghwaterstraat 44, 2628 CA Delft, The Netherlandsm.olivero.tudelft.nl

J. P. van Buijtenen

 Delft University of Technology, Process and Energy Department, Leeghwaterstraat 44, 2628 CA Delft, The Netherlandsj.p.vanbuijtenen@tudelft.nl

J. Eng. Gas Turbines Power 134(10), 102302 (Aug 22, 2012) (9 pages) doi:10.1115/1.4007120 History: Received June 18, 2012; Revised July 10, 2012; Published August 22, 2012; Online August 22, 2012

This paper presents a study on a small centrifugal impeller for microturbine application from a manufacturing perspective. The aim is to analyze the impact of geometric deviations on part performance using adequate performance modeling tools and statistical methods. A one-dimensional (1D) performance analysis tool was developed in-house derived from the meanline and two-zone modeling methods. The 1D model proved to be a simple and computationally inexpensive tool for having a quick performance analysis of the impeller using basic geometric information extracted from part drawings. For the sensitivity analysis, a total of eight input geometric parameters, including radii, tip-clearance, and blade angles, were varied individually within specific limits in the 1D tool for classifying their influence on the output performance. Since the 1D model is a simplified version of a much more complex three-dimensional (3D) model, a commercial computational fluid dynamics (CFD) tool was used to provide a comparison with the 1D model and scrutinize the effects of such deviations on the fluid behavior inside the impeller passage at a detailed level. For uncertainty quantification, Monte Carlo simulation was performed using the 1D model to assess the variability of overall impeller output performance to simultaneous random deviations in the input geometric parameters. The study is useful to evaluate the possibility of designing gas turbine parts for manufacturability and superior production cost-effectiveness.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Illustration of the objectives

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Figure 2

Single geometric parameter study

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Figure 3

Final machining of an impeller wheel

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Figure 4

Compressor specifications

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Figure 5

Impeller performance analysis scheme

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Figure 6

Impeller geometric model and grid

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Figure 7

Sensitivity analysis and 1D and CFD output comparison for evaluating the influence of various geometric parameters on impeller pressure ratio and efficiency

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Figure 8

Impeller performance sensitivity ranking

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Figure 9

Scatter plots from Monte Carlo simulation for effects of geometric parameters on (a) pressure ratio and (b) efficiency

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Figure 10

Probability distribution of variation in (a) pressure ratio and (b) efficiency

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