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Influence of shape of cutting tool on pressure conditions in workspace of mulcher with vertical axis of rotation

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dc.contributor.authorČedík, J.
dc.contributor.authorChyba, J.
dc.contributor.authorPexa, M.
dc.contributor.authorPetrásek, S.
dc.date.accessioned2017-05-31T10:51:36Z
dc.date.available2017-05-31T10:51:36Z
dc.date.issued2017
dc.descriptionArticleeng
dc.description.abstractNowadays there is laid great insistence on work efficiency improvement. This effort also affects the construction of mowers such as mulchers. Mulching with a vertical axis of rotation is very energy demanding work operation mainly, due to high energy losses. These energy losses, but also the quality of work, are influenced by the airflow and associated conditions of pressure inside the workspace of mulcher. Airflow in the workspace ensures repetitious contact of the truncated forage crops with the cutting edge tool and thus ensures crushing of aboveground parts of plants. The paper deals with the influence of the cutting tool shape on the mulcher’s inside workspace pressure conditions with the vertical axis of rotation. The influence of the trailing edge angle and rake angle on the pressure profile in the mulcher’s workspace with dependence on the rotor speed was examined. Measurements were performed on a laboratory single rotor mulcher model. It was found that in the mulcher’s workspace the vacuum is formed by virtue of the rotary movement of the cutting tools wherein the vacuum increases with rotor speed. The maximum measured vacuum was about 2.4 kPa and from the centre of the rotor towards its circumference almost linearly decreases. Furthermore, it was found that with decreasing trailing edge angle and with increasing rake angle the maximum vacuum decreases. When reducing the angle of the trailing edge from 45° to 25° led to reduction of vacuum of about 0.3 kPa (12.6%).eng
dc.identifier.issn1406-894X
dc.identifier.publicationAgronomy Research, 2017, vol. 15, no. 4, pp. 1530-1539eng
dc.identifier.urihttp://hdl.handle.net/10492/3493
dc.identifier.urihttp://dx.doi.org/10.15159/ar.17.006
dc.rights.holderCopyright 2009 by Estonian University of Life Sciences, Latvia University of Agriculture, Aleksandras Stulginskis University, Lithuanian Research Centre for Agriculture and Forestry. No part of this publication may be reproduced or transmitted in any form, or by any means, electronic or mechanical, incl. photocopying, electronic recording, or otherwise without the prior written permission from the Estonian University of Life Sciences, Latvia University of Agriculture, Aleksandras Stulginskis University, Lithuanian Research Centre for Agriculture and Forestry.eng
dc.subjectmulchereng
dc.subjectpressureeng
dc.subjectairfloweng
dc.subjectcutting tooleng
dc.subjectarticleseng
dc.titleInfluence of shape of cutting tool on pressure conditions in workspace of mulcher with vertical axis of rotationeng
dc.typeArticleeng

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2017, Vol. 15, No. 4