Investigation of the α angle’s effect on the performance of an Archimedes turbine

Siswantara, Ahmad Indra; Warjito,; Budiarso,; Harmadi, Rudias; Adanta, Dendy

doi:10.1016/j.egypro.2018.11.084

Cited by 18 publications

(15 citation statements)

References 8 publications

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“…Due to Erinofiardi et al, [32] reports is not satisfying, Siswantara et al, [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] also investigated the effect of the α angle on overflow leakage, where the analysis in the α angle of 36⁰ until 44⁰. Based on the results, the overflow leakage does affect the turbine efficiency but not the dominant effect, were in the angle of 36⁰ efficiency of 30% and 44⁰ the efficiency of 27.5% [20].…”

Section: Archimedes Screw Turbine Studiesmentioning

confidence: 99%

“…Contradicts to Rorres's [16] analysis, the overflow leakage should make efficiency go down drastically. Furthermore, overflow leakage occurs because of the large the α angle, but it can also be because of the large load received by the turbine [34]. In addition, the high loads received by the turbine also cause bubbles to form in buckets.…”

Section: Archimedes Screw Turbine Studiesmentioning

confidence: 99%

“…In hydropower generation, the appearance of bubbles should be avoided because cavitation can occurs [37]. However, there has not been a comprehensive study of the effect of the α angle on the formation of bubbles in the AST bucket [34].…”

Section: Archimedes Screw Turbine Studiesmentioning

confidence: 99%

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A Study of The Developing Archimedes Screw as A Turbine

Sari

Saputra

Syofii

et al. 2021

ARFMTS

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Electricity plays an imperative role in improving the rural or remote community economic growth and quality of life. The pico hydro type Archimedes screw turbine (AST) is considered an independent power plant in rural or remote areas. The advantages of the AST are friendly to aquatic biota, the high and stable efficiency (electrical efficiency of 30% to 49%), and can operate in a run of river conditions. However, although this technology has been studied ± two decades, there is still no theory explaining the relationship between conversion energy, the geometry of screws, and efficiency. Therefore, the development of Archimedes screw focuses on the role of a converter water energy categorized as the environmentally friendly power plant. Thus, this paper aims to describe the future work required for the AST so that the basic principles and empirical theories are found. Based on reviews, the AST design can use Rorres and Muller & Senior analysis, AC generators with a pulley and toothed belt transmission systems, and do not immerse the outflow bucket side in the water. Furthermore, for AST to be better, several studies need to be done such as the method of manufacturing precision screws, the effect bubbles in the bucket and how to avoid them, determination optimum of the head and screw length using the slope angle, and investigation of the ratio of the inlet velocity with the angular velocity of a wheel on performance to avoid overflow leakage due to loading.

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Section: Archimedes Screw Turbine Studiesmentioning

confidence: 99%

Section: Archimedes Screw Turbine Studiesmentioning

confidence: 99%

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A Study of The Developing Archimedes Screw as A Turbine

Sari

Saputra

Syofii

et al. 2021

ARFMTS

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“…Reference [10] presented a study on the performance of the Archimedes turbine, which found that the energy increases by increasing the angle of inclina-…”

Section: Introductionmentioning

confidence: 99%

Investigation of Physical and Numerical Model of Archimedes Screw Turbine

Abdullah¹,

Khalil²,

Kamel³

et al. 2020

JPEE

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Archimedes screw turbines have been developed as they work with a low head with high efficiency, where flow energy can be exploited in small rivers, streams, regulators and others. The power can be produced using Archimedes turbines and depends on some parameters including the number of blades, flow, and angle of the shaft inclination and the length of the pitch. A physical and numerical model has been developed to determine the performance of the Archimedes turbine on the Ramadi Dam in Iraq. The physical model was made of stainless steel with the following parameters (length 1000 mm, pitch 70 mm, diameter ratio 0.536, inclination angles 30˚, 35˚, 40˚, 45˚). Work was carried out on different flow rates and inclination angles. The experimental results showed that the highest efficiency was 81.4% at 35˚ inclination angle and a flow rate of 1.12 l/s; the maximum power of 9.03 watts was at a 45˚ inclination angle and a flow rate of 2.065 l/s and 72% efficiency. Also, the impact of the pitch and the number of blades were studied. The results show that torque is increase with an increase in the pitch length, and torque is decreased with increase in several blades. The numerical results showed that the using of two blades led to a greater power produced. The comparison of the numerical and experimental results showed a good agreement, also the comparison with the published data showed a good agreement. As a final result the Archimedes screw has many positive points making it a good potential candidate. The results that emerged show the possibility of using this type of turbine in the Euphrates River in Anbar Governorate-Iraq, as the province is characterized by the presence of many regulators on the river in which turbines can be employed.

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“…É importante ressaltar que os registros utilizados por Lavrič, Rihar e Fišer (2018) apresentam alta variação de vazão e nível, sendo que a faixa de operação considera para AST foi de 5 a 70 m 3 /s, enquanto os registros mostraram vazões de até 800 m 3 /s. Siswantara et al (2019) investigaram a relação entre a inclinação da AST e sua performance utilizando uma turbina experimental. A turbina possui duas pás e foi projetada com base nos resultados da otimização volumétrica de Rorres (2000), considerando uma vazão de 0,00106 m 3 /s e β variando entre 36 e 44 o .…”

Section: Principais Referências Sobre a Turbina De Arquimedesunclassified

Simulação numérica e otimização da eficiência hidráulica e da potência mecânica da turbina de Arquimedes

Reis¹

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RESUMOO propósito deste trabalho foi desenvolver uma metodologia para otimização da eficiência hidráulica e da potência mecânica da turbina de Arquimedes. Para isso, utilizou-se dinâmica de fluidos computacional juntamente com modelos analíticos e empíricos para se calcular os parâmetros de interesse da turbina. Um algoritmo computacional foi desenvolvido através da linguagem Python que, por sua vez, executa os softwares SALOME, OpenFOAM e o método BOBYQA, o qual consiste em aproximações iterativas da função objetivo por meio de curvas quadráticas. As equações analíticas e empíricas empregadas foram derivadas de modelos existentes na literatura e aplicadas na determinação do vazamento pelas frestas entre as pás móveis e a calha fixa da turbina. A simulação numérica desse tipo de vazamento exige grande refinamento localizado, devido à alta razão entre o diâmetro das pás e a largura da fresta. Assim, durante as simulações numéricas as frestas foram desconsideradas do domínio computacional e, para corrigir as soluções, subtraiu-se o vazamento pré-estimado da vazão total da turbina. Primeiramente, foram validados os resultados referentes ao vazamento por frestas, os quais apresentaram boa concordância com dados da literatura. Um estudo de caso permitiu ajustar as curvas desse vazamento em função do diâmetro da turbina de Arquimedes. Concluiu-se que a perda de eficiência devido a esse efeito foi mais significativa em turbinas com menores diâmetros e com maiores inclinações. As potências mecânicas e as eficiências hidráulicas calculadas nas simulações numéricas da turbina de Arquimedes foram próximas de dados numéricos e experimentais existentes na literatura. Observou-se que a perda de potência por efeitos viscosos aumentou em altas rotações. Além disso, o aumento da rotação também reduziu o preenchimento da turbina, causando refluxos na descarga e perda de eficiência. Por outro lado, baixas rotações elevaram o preenchimento e causaram perdas por sobrepreenchimento. As otimizações com uma variável necessitaram de até sete iterações para determinar pontos ótimos e as multiparamétricas, até quatorze iterações. A maior eficiência hidráulica determinada foi de 88,2%. Observou-se também que as maiores eficiências hidráulicas ocorreram em níveis de preenchimento próximos a 40% na entrada do parafuso. Em tais condições, os vazamentos por sobrepreenchimento foram eliminados ou reduzidos, o que contribuiu para o aumento da eficiência da turbina de Arquimedes.

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Investigation of the α angle’s effect on the performance of an Archimedes turbine

Cited by 18 publications

References 8 publications

A Study of The Developing Archimedes Screw as A Turbine

A Study of The Developing Archimedes Screw as A Turbine

Investigation of Physical and Numerical Model of Archimedes Screw Turbine

Simulação numérica e otimização da eficiência hidráulica e da potência mecânica da turbina de Arquimedes

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