PM—Power and Machinery: Influence of Knife Configuration and Tip Speed on Conveyance in Flail Forage Harvesting
✍ Scribed by P.S. Chattopadhyay; K.P. Pandey
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 164 KB
- Volume
- 78
- Category
- Article
- ISSN
- 0021-8634
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✦ Synopsis
An experimental model of the #ail-type forage harvester was fabricated to study the e!ect of #ail tip speed, knife rake angle and bevel angle on conveying of chopped forage sorghum (S. bicolor) through a 903 de#ector elbow under laboratory conditions. The exit air velocity from the chute outlet and static pressure head created at the blower outlet were measured. The exit velocity of the chopped forage and the corresponding throw distance were determined considering the aerodynamic properties of the chopped forage material.
The knife bevel angle did not have a signi"cant e!ect on the throw distance of the chopped forage material. The exit air velocity from the chute outlet increased logarithmically as the #ail tip speed was increased from 20 to 60 m s\ and it decreased linearly as the knife rake angle was increased from 20 to 603. The static pressure head created by the rotating #ails at the blower outlet (chute inlet) increased exponentially as the #ail tip speed was increased, and decreased linearly when the knife rake angle was increased. The static pressure head developed by the #ail knives was not su$cient to convey the chopped forage through the chute without the in#uence of acceleration energy imparted to the chopped material during impact cutting by the #ail knives.
The exit air velocity from the chute outlet was found to be about 50}60% of that observed for the chopped forage material, indicating that the acceleration energy imparted by the #ails during impact cutting added energy to the air stream. The throw distance of the chopped forage from the chute outlet increased in the range of 65}95% with the increase in #ail tip speed from 20 to 60 m s\ and it decreased in the range of 20}40% as the rake angle was increased from 20 to 603.