Browsing by Author "Legonda, I. A."

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    An investigation on performance of a horizontal entrained flow gasifier
    (2018) Legonda, I. A.
    A novel study on biomass-air gasification using a horizontal entrained-flow gasifier has been conducted. The use of a horizontal entrained-flow gasifier reactor was employed to assess the effect of the gasifier reactor orientation on the gasification process. The gasification experiments were conducted at 800˚C and equivalence ratio of 0.23 while maintaining gas hourly space velocity (GHSV) of 8000 h−1. Preparation and characterisation of wood powder were performed using classical methods. The research findings showed that maximum fuel conversion and cold gas efficiency using a horizontal entrained- flow gasifier were 99% and 70% respectively compared to 91% and 62% respectively of the vertical design. Moreover, the gasifier length can also be reduced from the common 1000 - 2000 mm to 500 mm. In general, the results of this study suggest that there exists a sensitivity to the gasifier orientation on the overall gasification process.
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    An investigation on the flow characteristics in the cross-flow turbine-T15 300
    (2016) Legonda, I. A.
    A study on the flow characteristics in the cross-flow turbine model T15 300 has been conducted. The study was designed to examine the fluid flow trajectory in the tur-bine and identify areas for further improvement. Computational fluid dynamics (CFD) approach was employed and the results were compared with experimental data. The simulation study was conducted at guide vane angle of 20o, 30o, 35oand 41o. The shaft diameter was set at 30 mm, 45 mm, 60 mm, and 75 mm for each head while the head was maintained at 50 m. The flow characteristics were determined using particles trajectory.The research findings showed that the optimal vane angle and shaft diameter for cross-flow turbine were 41oand 45 mm respectively. These results are in good agreement with experimental data from previous studies.