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Open AccessArticle

Design and Output Performance Model of Turbodrill Blade Used in a Slim Borehole

by Yu Wang 1, Bairu Xia 1,*, Zhiqiao Wang 1,*, Liguang Wang 1,2 and Qin Zhou 1
1
School of Engineering and Technology, China University of Geosciences, Beijing 100083, China
2
China Railway Rolling stock Corporation (CRRC), Beijing Locomotive Co., Ltd., Beijing 100072, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Kamel Hooman
Energies 2016, 9(12), 1035; https://doi.org/10.3390/en9121035
Received: 1 September 2016 / Revised: 10 November 2016 / Accepted: 30 November 2016 / Published: 8 December 2016
Small-diameter turbodrills have great potential for use in slim boreholes because of their lower cost and higher efficiency when used in geothermal energy and other underground resource applications. Multistage hydraulic components consisting of stators and rotors are key aspects of turbodrills. This study aimed to develop a suitable blade that can be used under high temperature in granite formations. First, prediction models for single- and multi-stage blades were established based on Bernoulli’s Equation. The design requirement of the blade for high-temperature geothermal drilling in granite was proposed. A Φ89 blade was developed based on the dimensionless parameter method and Bezier curve; the parameters of the blade, including its radial size, symotric parameters, and blade profiles, were input into ANASYS and CFX to establish a calculation model of the single-stage blade. The optimization of the blade structure of the small-diameter turbodrill enabled a multistage turbodrill model to be established and the turbodrill’s overall output performance to be predicted. The results demonstrate that the design can meet the turbodrill’s performance requirements and that the multistage model can effectively improve the accuracy of the prediction. View Full-Text
Keywords: slim borehole; granite section; turbodrill; multistage simulation models; output performances prediction slim borehole; granite section; turbodrill; multistage simulation models; output performances prediction
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Wang, Y.; Xia, B.; Wang, Z.; Wang, L.; Zhou, Q. Design and Output Performance Model of Turbodrill Blade Used in a Slim Borehole. Energies 2016, 9, 1035.

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