Internal Structure of a Jet Nozzle for Coalbed Methane Mining Based on Airfoil Curves
Joint Authors
Guo, Liwen
Chen, Jian
Hu, Yanwei
Chen, Yong
Source
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-17, 17 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-12-02
Country of Publication
Egypt
No. of Pages
17
Main Subjects
Abstract EN
Based on airfoil curves that can effectively balance the rectification and drag reduction effects in flight hydrodynamics, we designed an internal streamline structure of jet nozzle for coalbed methane (CBM) mining.
The three types of nozzles originating from three typical airfoil curves are compared with the conical nozzle.
Results showed that the thin-type streamlined nozzle had the largest effective shock range and least radial divergence and was thus selected as the best nozzle.
Moreover, the pressure distribution at the outlet of the nozzle was found to be related to the range and number of small-pressure fluctuations near the wall.
A larger number of small-pressure fluctuations and a larger range caused faster pressure of the jet water column to decay along the axial direction.
Rectification with a concentrated effect also slowed down the attenuation velocity of the jet-water-column pressure between the concentration point and the nozzle.
The variation rule of shock pressure with range was further determined experimentally.
We found that the shock pressure of jet water column initially increased within a short distance and then decreased rapidly.
The effective shock range of the thin-type streamlined nozzle in air was 1.417 times that of the conical nozzle, and the effective reaming area was 1.104 times greater.
Thus, the effect of reaming was effectively improved.
The length of the water column at high pressure was larger than that of the conical nozzle, and the shock efficiency was relatively high.
American Psychological Association (APA)
Chen, Jian& Guo, Liwen& Hu, Yanwei& Chen, Yong. 2018. Internal Structure of a Jet Nozzle for Coalbed Methane Mining Based on Airfoil Curves. Shock and Vibration،Vol. 2018, no. 2018, pp.1-17.
https://search.emarefa.net/detail/BIM-1215213
Modern Language Association (MLA)
Chen, Jian…[et al.]. Internal Structure of a Jet Nozzle for Coalbed Methane Mining Based on Airfoil Curves. Shock and Vibration No. 2018 (2018), pp.1-17.
https://search.emarefa.net/detail/BIM-1215213
American Medical Association (AMA)
Chen, Jian& Guo, Liwen& Hu, Yanwei& Chen, Yong. Internal Structure of a Jet Nozzle for Coalbed Methane Mining Based on Airfoil Curves. Shock and Vibration. 2018. Vol. 2018, no. 2018, pp.1-17.
https://search.emarefa.net/detail/BIM-1215213
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1215213