Design of Negative Pressure Spiral Feeding Device for Tangential and Longitudinal Axial Intersection of Combine Harvester

Table 1

Airflow velocity values within a semicircular cross section (m/s).

Semicircular cross section	1	2	3	4	5	6	7
1 (upper layer)	4.22	4.13	3.96	4.03	3.86	4.01	4.26
2 (middle layer)	4.29	4.53	4.59	4.13	4.38	4.58	4.43
3 (lower layer)	4.14	3.76	3.89	3.96	4.07	3.79	4.02