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Modeling the optimal factors affecting combine harvester header losses CIGR Journal
Zareei, Samira; Abdollahpour, Shamsollah.
Combine header loss comprises more than 50% of wheat harvesting losses.  Therefore, decline in this part of the loss to the extent allowed amount is an important step in reducing of crop wastes.  Combine header is a complex system in which several factors are involved in its work.  And, if these factors can be adjusted and controlled to suit the working conditions, to a large extent of crop loss can be prevented during the harvest.  In this study, reel index, cutting height of crop and horizontal and vertical distance of reel from cutter bar were selected as the effective factors in header loss.  In response surface method, central composite design was used to modeling and finding optimal levels of mentioned factors.  The results showed that power model...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cutting height; Grain loss; Header parameters; Reel index; Wheat.
Ano: 2016 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/3701
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Improving the performance of mechanical stirring in biogas plant by computational fluid dynamics (CFD) CIGR Journal
Mohammadrezaei, Rashed; Zareei, Samira; Behroozi-Khazaei, Nasser.
Stirring of material in biogas plant needs to be done to provide desirable contact between microorganisms and substrate which can improve digestion process. In the present study, computational fluid dynamics (CFD) was used to determine a suitable mechanical stirrer for biogas plant and simulate the flow pattern. In order to select optimum design of impeller, three types of impeller including six-blade turbine, four-blade turbine and six-flat-blade disc turbine were evaluated. Simulations were undertaken utilizing Fluent 15.0 software with a multiple reference frame approach via standard k-ε turbulence model under steady-state conditions. According to the simulation results, six-blade turbine impeller is more appropriate than the two other impellers. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Energy; Biogas; Stirrer Anaerobic digestion cow manure flow pattern simulation stirred tank.
Ano: 2018 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4183
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