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      • HARVEST
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      Determination of the air and crop flow behaviour in the blowing unit and spout of a pull-type forage harvester

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      ThesisDennisLammers.pdf (6.806Mb)
      Date
      2005-05-24
      Author
      Lammers, Dennis Peter
      Type
      Thesis
      Degree Level
      Masters
      Metadata
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      Abstract
      The energy requirements of forage harvesters can be quite high and can sometimes determine the size of tractor needed on a farm. Therefore, improving the energy efficiency of the forage harvester could allow a farm to reduce costs by using a smaller tractor that is less expensive and more efficient. The objective of this research was to increase the throwing distance of a forage harvester by modeling the flow of forage in the spout and the air flow in the blower and spout. These models can then be used to compare the efficiencies of prototype designs. The air flow in the blower and spout was modeled using the commercial computational fluid dynamics software FLUENT. The simulation results of air velocities and flow patterns were compared to experimental values and it was found that both were of the same order of magnitude with the model predicting slightly higher air velocities than those measured. The flow of forage in the spout was modeled analytically by taking into account the friction between the forage and the spout surface and the aerodynamic resistance after the forage leaves the spout. From this model, two improved prototype spouts that should theoretically result in longer throwing distances were designed. However, field testing of the two prototypes did not reveal any significant improvements over the current design. It was also found that the model under-predicted the throwing distance of one prototype by 2 % and over estimated the other by 12 %.
      Degree
      Master of Science (M.Sc.)
      Department
      Agricultural and Bioresource Engineering
      Program
      Agricultural and Bioresource Engineering
      Supervisor
      Roberge, Martin
      Committee
      Sumner, David; Maule, Charles P.; Laguë, Claude; Crowe, Trever G.
      Copyright Date
      May 2005
      URI
      http://hdl.handle.net/10388/etd-07282005-163454
      Subject
      cfd
      numerical model
      analytical model
      modeling
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