Air Curtain Dust Removal Device Design and Dust Prevention Strategy in Heading Face

Table 3

Average test data.

Test item	Unit	Direction	Group 1	Group 2
Exit slit width	mm	Upper	12	20
		Right	9	15
Average airflow velocity at the injection outlet	m/s	Upper	18.2	17
		Right	14.65	10.4
Average airflow velocity at a distance of 1 m from the injection outlet (1 m above the base plate)	m/s	Upper	4.6	4.4
		Right	3.9	3.3
Average airflow velocity at a distance of 1.5 m from the injection outlet (1 m above the base plate)	m/s	Upper	2.9	3.4
		Right	3.2	2.78