Investigations of Ventilation Airflow Characteristics on a Longwall Face—A Computational Approach
Abstract
:1. Introduction
2. Review of CFD Modelling of Underground Ventilation Systems
3. Development of Longwall CFD Models
3.1. Overview of the Longwall Model
3.2. Model Mesh and Boundary Condition
3.3. Governing Equations and Turbulence Model Selection
4. Mesh Independent Study and Model Validation
4.1. Mesh Independent Study
4.2. Model Validation
5. Base Model Results and Discussion
5.1. General Airflow Patterns
5.2. Flow Separation along Longwall Face
5.3. Airflow Patterns around the Shearer
5.4. Velocity Distribution cross the Face
6. Parametric Studies
6.1. Impact of Shearer Position
6.2. Impact of Cutting Sequence
7. Conclusions
Author Contributions
Acknowledgments
Conflicts of Interest
References
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Country | Date | Coal Mine | Fatalities |
---|---|---|---|
China | 14 February 2005 | Sunjiawan, Haizhou shaft, Fuxin | 214 |
USA | 2 June 2006 | Sago, West Virginia | 12 |
Poland | 21 November 2006 | KWK Halemba, Ruda Śląska | 19 |
Kazakhstan | 20 September 2006 | Lenina, Karaganda | 43 |
Russia | 19 March 2007 | Ulyanovskaya, Kemerovo | 108 |
Ukraine | 19 November 2007 | Zasyadko, Donetzk | 80 |
Poland | 18 September 2009 | KWK Wujek (Śląsk), Ruda Śląska | 20 |
USA | 5 April 2010 | Upper Big Branch, West Virginia | 29 |
Russia | 8 May 2010 | Raspadskaya, Kemerovo Oblast | 66 |
Turkey | 17 May 2010 | Karadon, Zonguldak | 30 |
New Zealand | 19 November 2010 | Pike River Mine | 29 |
Turkey | 13 May 2014 | Soma, Turkey | 301 |
Ukraine | 4 March 2015 | Zasyadko, Donetzk | 33 |
China | 30 October 2016 | Jinshangou, Chongqing | 33 |
Item | Unit/m | Item | Unit/m |
---|---|---|---|
Face length | 200 | MG/TG width | 5 |
Face height | 3.5 | MG/TG height | 3.5 |
Goaf depth | 10 | MG/TG length | 50 |
Model Reference Name | Scenario |
---|---|
MG-TG Case 1 | Shearer is cutting towards TG and is located on MG side |
MG-TG Case 2 | Shearer is cutting towards TG and is located at face middle |
MG-TG Case 3 | Shearer is cutting towards TG and is located on TG side |
TG-MG Case 1 | Shearer is cutting towards MG and is located on MG side |
TG-MG Case 2 | Shearer is cutting towards MG and is located at face middle |
TG-MG Case 3 | Shearer is cutting towards MG and is located on TG side |
Position | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
---|---|---|---|---|---|---|---|---|---|---|
1 m from MG | - | - | - | - | - | - | - | - | - | - |
Measured (m/s) | 1.8 | 3.5 | 2.9 | 3.0 | 2.2 | 3.3 | 2.2 | 2.8 | 2.3 | 1.7 |
Modelled (m/s) | 1.71 | 3.68 | 2.79 | 3.06 | 2.41 | 3.33 | 2.43 | 2.71 | 2.13 | 1.78 |
Error (%) | −5.00 | 5.14 | −3.79 | 2.00 | 9.55 | 0.91 | 10.45 | −3.21 | −7.39 | 4.71 |
2 m before MG drum | - | - | - | - | - | - | - | - | - | - |
Measured (m/s) | 2.5 | 3.0 | 1.9 | 2.0 | 2.2 | 1.6 | 1.2 | 2.6 | 1.5 | 1.0 |
Modelled (m/s) | 2.61 | 2.95 | 2.05 | 2.17 | 2.36 | 1.55 | 1.25 | 2.53 | 1.38 | 0.95 |
Error (%) | 4.40 | −1.67 | 7.89 | 8.50 | 7.27 | −3.13 | 4.17 | −2.69 | −8.00 | −5.00 |
Shearer middle | - | - | - | - | - | - | - | - | - | |
Measured (m/s) | 3.0 | - | 2.5 | 2.6 | 2.3 | 1.2 | 2.0 | 2.9 | 1.8 | 1.0 |
Modelled (m/s) | 3.23 | - | 2.67 | 2.78 | 2.46 | 1.31 | 2.12 | 2.87 | 1.69 | 0.91 |
Error (%) | 7.67 | - | 6.80 | 6.92 | 6.96 | 9.17 | 6.00 | −1.03 | −6.11 | −9.00 |
2 m behind TG drum | - | - | - | - | - | - | - | - | - | - |
Measured (m/s) | 2.5 | 2.6 | 3.6 | 3.2 | 2.8 | 2.2 | 2.5 | 3.2 | 0.8 | 0.2 |
Modelled (m/s) | 2.53 | 2.71 | 3.83 | 3.39 | 2.92 | 2.06 | 2.41 | 3.08 | 0.75 | 0.26 |
Error (%) | 1.20 | 4.23 | 6.39 | 5.94 | 4.29 | −6.36 | −3.60 | −3.75 | −6.25 | 30.00 |
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Wang, Z.; Ren, T.; Ma, L.; Zhang, J. Investigations of Ventilation Airflow Characteristics on a Longwall Face—A Computational Approach. Energies 2018, 11, 1564. https://doi.org/10.3390/en11061564
Wang Z, Ren T, Ma L, Zhang J. Investigations of Ventilation Airflow Characteristics on a Longwall Face—A Computational Approach. Energies. 2018; 11(6):1564. https://doi.org/10.3390/en11061564
Chicago/Turabian StyleWang, Zhongwei, Ting Ren, Liqiang Ma, and Jian Zhang. 2018. "Investigations of Ventilation Airflow Characteristics on a Longwall Face—A Computational Approach" Energies 11, no. 6: 1564. https://doi.org/10.3390/en11061564