Distribution Law and Prediction Model of Dust Concentration under Airflow Adjustment in Fully Mechanized Heading Face

Table 5

The simulation schemes under airflow adjustment.

Scheme	L (m)	d (m)	a (°)	b (°)
1	5	1.1	5	4
2	5	1.1	10	6
3	5	1.1	15	2
4	5	1.2	5	6
5	5	1.2	10	2
6	5	1.2	15	4
7	6	1.0	5	4
⋮	⋮	⋮	⋮	⋮
34	10	0.9	5	2
35	10	0.9	10	4
36	10	0.9	15	0

where L (m) represents the distance from the duct outlet to heading face, d (m) represents the duct outlet caliber, a (°) represents the horizontal right deviation of duct outlet, b (°) represents the vertical upward deflection of duct outlet.