CFD-Based Determination of the Optimal Blowing and Suction Air Volume Ratio of Dual-Radial Swirl Shielding Ventilation in a Fully Mechanized Excavation Face

Table 1

Parameter setting of boundary conditions.

Blowing and suction air volume ratio	The air volume of the suction tube (m^3/min)	Suction outlet wind speed (m/s)	Air volume out of annular slit (m^3/min)		Outlet wind speed of annular slit (m/s)
			1#	2#	3#	4#
1.2	250.00	14.74	175.00	125.00	12.90	9.22
1.3	230.77	13.61
1.4	214.29	12.64
1.5	200.00	11.80
1.6	187.50	11.06
1.7	176.47	10.41