Reverse running pumps analytical, experimental and computational study: A review

Nautiyal, Himanshu; Varun, _; Kumar, Anoop

doi:10.1016/j.rser.2010.04.006

Cited by 127 publications

(42 citation statements)

References 12 publications

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“…A pump can run as a turbine with an acceptable efficiency. Due to its apparent advantages of being cheap and readily available worldwide, pump as turbine is one of the best options for small hydropower recovery [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Research on Blade Thickness Influencing Pump as Turbine

Yang

Wang

Chen

et al. 2014

Advances in Mechanical Engineering

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Research on the efficiency improvement of pump as turbine (PAT) is inadequate. Blade thickness is an important geometry parameter in blade design. To explore effects of blade thickness on the influence of PAT, numerical research on three different specific speeds of PATs with different blade thickness was carried out. Their performance changes with blade thickness were presented. Besides, the variations of hydraulic loss distribution with increasing blade thickness were performed. Theoretical analysis gives a reasonable explanation for the performance change. Results show that PAT's flow versus efficiency curve ( -) is lowered; flow versus head ( -) curve and flow versus power ( -) curve are increased with increasing blade thickness. The increase of -is mainly attributed to the increase of theoretical head caused by increasing blockage of impeller inlet area. Hydraulic loss distribution analysis indicates that the total hydraulic loss within PAT is increased with increasing blade thickness. The increase of -curve is a combined effect of the increase in theoretical head and the total hydraulic loss. The decrease of efficiency with increasing blade thickness indicates that the blade thickness of PAT should be as thin as possible if its strength could be met.

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Section: Introductionmentioning

confidence: 99%

Research on Blade Thickness Influencing Pump as Turbine

Yang

Wang

Chen

et al. 2014

Advances in Mechanical Engineering

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“…Sin embargo, cabe destacar que, numerosos autores (e.g., Nautiyal et al, 2010;Pugliese et al, 2016) han desarrollado trabajos experimentales, los cuales, han utilizado alguno de los métodos presentados anteriormente y han mostrado que el uso de éstos, puede presentar desviaciones respecto al punto real que llegan superiores al 20%. De entre todos ellos, el más utilizado es el Método Sharma-Williams, debido a que únicamente necesita el rendimiento óptimo de la máquina operando como bomba, por su sencillez de aplicación y el que en la mayoría de los casos presenta los resultados con un menor error de predicción frente al resto de métodos.…”

Section: Q= K Q Q Bepunclassified

“…En la Tabla 3 se muestran los valores obtenidos cuando se determinan a partir de la eficiencia en el punto óptimo de la bomba. Se han tomado los métodos más usados, de los cuales, el más extendido es el método de Sharman (ID 4) (Nautiyal et al, 2010). Estimados los coeficientes empíricos, los puntos empíricos de operación en el punto de funcionamiento óptimo son determinados para los 7 puntos teóricos definidos anteriormente.…”

Section: Selección De Máquina Operando Como Turbinaunclassified

Estimación de las curvas características de operación de sistemas de impulsión operando como turbinas a partir de su curva motriz trabajando como bomba

2018

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Romero-Marrero et al. | Estimación de las curvas características de operación de sistemas de impulsión operando […] RESUMENEl presente trabajo presenta una metodología para seleccionar bombas operando como turbinas en sistemas de recuperación energética en redes de distribución a partir de su curva motriz operando como bomba. A partir de una revisión de los métodos empíricos existentes en este campo, se propone una metodología para estimar de forma empírica el punto de funcionamiento de estas máquinas. La metodología determina el análisis del punto funcionamiento (caudal, altura recuperada y eficiencia), tanto para caudales constantes como variables en el tiempo. En situaciones de caudal variable, la metodología utiliza curvas experimentales, las cuales están definidas por el coeficiente de descarga y de altura. La metodología se ha aplicado a un caso de estudio en Callosa d'en Sarrià (Alicante), en el cual, la bomba operando como turbina con caudales variables, obtiene una energía recuperable de 76884.71 kWh/año. Esta energía representa un 74.21% de la energía que actualmente disipa la válvula reductora instalada.Palabras clave | nexo agua-energía; sistemas de recuperación energética; PATs; eficiencia energética. ABSTRACTThe current research presents a methodology to select pump working as turbines (PAT)

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“…In many countries, small and micro hydropower systems are an important means of electricity generation. An efficient solution, from the point of view of energy efficiency, is the adoption of a turbine, but the purchase and maintenance costs of turbines make their implementation economically unattractive, especially for small hydropower [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

A Performance Prediction Method for Pumps as Turbines (PAT) Using a Computational Fluid Dynamics (CFD) Modeling Approach

2017

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Small and micro hydropower systems represent an attractive solution for generating electricity at low cost and with low environmental impact. The pump-as-turbine (PAT) approach has promise in this application due to its low purchase and maintenance costs. In this paper, a new method to predict the inverse characteristic of industrial centrifugal pumps is presented. This method is based on results of simulations performed with commercial three-dimensional Computational Fluid Dynamics (CFD) software. Model results have been first validated in pumping mode using data supplied by pump manufacturers. Then, the results have been compared to experimental data for a pump running in reverse. Experimentation has been performed on a dedicated test bench installed in the Department of Civil Construction and Environmental Engineering of the University of Naples Federico II. Three different pumps, with different specific speeds, have been analyzed. Using the model results, the inverse characteristic and the best efficiency point have been evaluated. Finally, results have been compared to prediction methods available in the literature.

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Reverse running pumps analytical, experimental and computational study: A review

Cited by 127 publications

References 12 publications

Research on Blade Thickness Influencing Pump as Turbine

Research on Blade Thickness Influencing Pump as Turbine

Estimación de las curvas características de operación de sistemas de impulsión operando como turbinas a partir de su curva motriz trabajando como bomba

A Performance Prediction Method for Pumps as Turbines (PAT) Using a Computational Fluid Dynamics (CFD) Modeling Approach

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