Research Article
Performance Evaluation of the Melkassa-Made Engine-Driven Maize Sheller
Issue:
Volume 12, Issue 6, December 2024
Pages:
136-141
Received:
29 October 2024
Accepted:
20 November 2024
Published:
12 December 2024
Abstract: The strategy of Ethiopian mechanization is to minimize postharvest loss. The methods of crop production were traditional. It involves high drudgery, low quality and quantity, time-consuming, and inefficient operation. To minimize loss, the sheller, thresher, and storage developed. But the performance was not clearly determined for researchers and manufacturers for selection and multiplication. The target of this research was the evaluation of Melkassa maize Sheller. It was conducted at three levels of feed rate: 7500, 6500, and 500 kg/hr., and speed: 700, 650, and 600 rpm. The moisture is 14 percent and maize LIMU variety. Split plot design of feed rate as the main factor and drum speed as a sub factor. The maximum shelling capacity of 6608.9 kg/h was achieved at a feed rate of 750 kg/h and a speed of 700 rpm. Where the minimum obtained at 5000 kg/hr and a speed of 600 rpm is 4242.27 kg/hr. The highest efficiency was 99.9 percent, the maximum breakage was 1.06 percent. The maximum fuel consumption is 2.347214 L/hr. The machine can significantly reduce drudgery and save time, energy, and cost of operation. As a suggestion, if engine changed to tractor attached will increase the requisition of technologies.
Abstract: The strategy of Ethiopian mechanization is to minimize postharvest loss. The methods of crop production were traditional. It involves high drudgery, low quality and quantity, time-consuming, and inefficient operation. To minimize loss, the sheller, thresher, and storage developed. But the performance was not clearly determined for researchers and m...
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Research Article
Fabrication of Burner Rig and Testing of Thermal Barrier Coatings
Bibhum Shrestha*
,
Sreenivas Subramaiah
Issue:
Volume 12, Issue 6, December 2024
Pages:
142-151
Received:
31 October 2024
Accepted:
27 November 2024
Published:
31 December 2024
DOI:
10.11648/j.ijmea.20241206.12
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Abstract: This research explores the design and fabrication of burner rig to test Thermal Barrier Coatings (TBCs) aimed at enhancing the longevity and performance of gas turbines. Gas turbines, commonly used in aviation and power generation, face extreme operating conditions with high temperatures and thermal gradients that can lead to significant component damage. TBCs, ceramic coatings applied to engine components, play a crucial role in providing thermal insulation and mitigating thermal fatigue, oxidation, and thermal shock. The study involved designing a burner rig, modeled in Solid Works and fabricated from mild steel, to replicate the high temperature environment of gas turbines. The experimental setup was enhanced by the precise machining of components like the aluminum alloy 6061 substrate, achieved through EDM wire cutting. The study demonstrates how factors such as material selection, bond coat and topcoat thickness, porosity, and thermal cycling significantly influence TBC performance. Testing with the burner rig showed that TBCs can greatly enhance engine efficiency and lifespan by providing robust thermal insulation. Advanced monitoring techniques, including infrared thermography and acoustic emission testing, were employed to evaluate the behavior of TBCs under thermal cycling. The findings underscore the need for balancing thermal insulation with thermal stress resistance to maximize coating performance. This research serves as a foundation for further advancements in TBC materials and testing methodologies, with the goal of enhancing the operational efficiency, longevity, and environmental sustainability of gas turbine engines.
Abstract: This research explores the design and fabrication of burner rig to test Thermal Barrier Coatings (TBCs) aimed at enhancing the longevity and performance of gas turbines. Gas turbines, commonly used in aviation and power generation, face extreme operating conditions with high temperatures and thermal gradients that can lead to significant component ...
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