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Mathematical Problems in Engineering
Volume 2017 (2017), Article ID 5867101, 15 pages
https://doi.org/10.1155/2017/5867101
Research Article

Performance Improvement of a Micro Impulse Water Turbine Based on Orthogonal Array

Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China

Correspondence should be addressed to Lingdi Tang; moc.361@dlttalegna

Received 14 May 2017; Accepted 2 November 2017; Published 7 December 2017

Academic Editor: Jian G. Zhou

Copyright © 2017 Lingdi Tang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The study on structural design and efficiency improvement of the micro impulse water turbine with the super-low specific speed has rarely been reported in literature. In this paper, a micro impulse water turbine was optimized on the base of the orthogonal array of L18(37) with six factors. The range analysis and variance analysis were conducted to present the significance ranking of factors and the optimal combinations of factors, aiming to improve the water turbine efficiency taken as the experimental indicator in the orthogonal experiment. And then the optimal parameter combination for the water turbine was calculated by orthogonal experiment. Moreover, the internal flow field and hydraulic performance were simulated numerically to investigate the principle of performance improvement by comparing the optimized water turbine with the original. Also, the numerical method was verified by experimental result from performance tests of the original water turbine. As a result, the runner torque of the optimized water turbine was 13% higher than that of the original and the water turbine efficiency was improved by 5.8 percentage points at the rated operating condition.