science
Study Examines Airflow Velocity in Irregular Mine Roadways
Researchers used computer models and field tests to map airflow patterns in mine tunnels with irregular shapes. The work identifies where average wind speed occurs and aims to improve sensor placement for ventilation safety.
May 17, 8:00 PM·1m read1 source
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A new study analyzed airflow velocity distribution in mine roadways that have irregular cross-sections. Researchers combined numerical simulations with measurements taken at Taoyuan Coal Mine to examine how velocity varies across different shapes and support types.
Three-dimensional models of semi-circular arch and trapezoidal roadways were created using Fluent software. The models tested varying convex radii from 0 to 500 millimeters, different cross-sectional dimensions, inlet velocities between 0.5 and 8 meters per second, and multiple support configurations.
Velocity patterns were studied in fully developed turbulent regions located 120 meters from the inlet. Nonlinear fitting revealed a logarithmic relationship between point wind speed and distance from the roadway wall.
The position of the average wind speed line was determined to be approximately 0.11 times the roadway width or height from the walls in regular sections and 0.1 times in irregular sections. Field measurements using a hot-wire anemometer and the traverse method showed relative error within 5 percent compared to simulation results.
The study provides data for optimizing sensor placement and improving measurement accuracy in irregular mine roadways.
