Energy Losses Assessment of Smallholder Farmers’ Surface Water Irrigation Pumps in South and Southeast Asia Using Entropy Generation Principle

IF 1.1 4区工程技术 Q4 MECHANICS

Journal of Applied Fluid Mechanics Pub Date : 2023-10-01 DOI:10.47176/jafm.16.10.1851

W. Sanghirun, W. Asvapoositkul

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引用次数: 1

Abstract

One of the most serious problems among smallholder farmers in South and Southeast Asia associated with the use of a surface water irrigation pump is low engine performance. The main cause of this low performance is the decrease in the flow field energy conversion mechanism caused by irreversible processes. The energy conversion theory suggests that pump efficiency is maximum when the loss is minimum. Whatever the origin of the losses, the deterioration in engine performance is due to a deterioration in the reversibility of the pump system. In this study, the pump is classified as the propeller impeller (PI), the improved axial or typical impeller (TI), and the conical hollow-shaped impeller (CI). Entropy production is applied to the pump on design improvement and loss sources location and mechanisms. The entropy production consists of viscous dissipation and turbulent dissipation. In this study, the pump design improvement of various designs based on entropy production has been studied in detail to predict energy loss in areas such as the inlet section, impeller, or discharge pipe. With the entropy generation, the optimum efficiency of different pump designs CI, PI, and TI were determined. The results showed that in all designs, more than 63% of the total entropy generation came from turbulent distribution. The flow in the pumps was analyzed in detail in comparison with entropy generation. It was found that the entropy generation rate increased in the secondary flow direction and was consistent with free-stream velocity. The PI design at the inlet pipe should be modified for reducing flow separation and entropy generation. All design impellers showed high energy losses, especially near the hub and tip along the leading edge and trailing edge. Therefore, it is possible to determine which features of the flow and entropy generation are relevant to the pump improvement.

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基于熵产生原理的南亚和东南亚小农户地表水灌溉水泵能量损失评估

在南亚和东南亚的小农户中，与使用地表水灌溉泵有关的最严重问题之一是发动机性能低。这种低性能的主要原因是不可逆过程导致的流场能量转换机制的降低。能量转换理论表明，当损失最小时，泵的效率最大。无论损失的来源是什么，发动机性能的恶化都是由于泵系统可逆性的恶化。在本研究中，泵被分为螺旋桨叶轮（PI）、改进的轴向或典型叶轮（TI）和锥形中空叶轮（CI）。将熵产应用于泵的设计改进和损失源的定位与机理。熵产生包括粘性耗散和湍流耗散。在这项研究中，详细研究了基于熵产生的各种设计的泵设计改进，以预测入口段、叶轮或排放管等区域的能量损失。通过熵产生，确定了不同泵设计的最佳效率CI、PI和TI。结果表明，在所有设计中，63%以上的总熵产生来自湍流分布。将泵中的流动与熵产生进行了详细的比较分析。研究发现，二次流方向的熵产生率增加，与自由流速度一致。应修改入口管处的PI设计，以减少流分离和熵产生。所有设计的叶轮都显示出较高的能量损失，尤其是在轮毂和叶尖附近的前缘和后缘。因此，可以确定流量和熵产生的哪些特征与泵的改进相关。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Applied Fluid Mechanics THERMODYNAMICS-MECHANICS

CiteScore

2.00

自引率

20.00%

发文量

138

审稿时长

>12 weeks

期刊介绍： The Journal of Applied Fluid Mechanics (JAFM) is an international, peer-reviewed journal which covers a wide range of theoretical, numerical and experimental aspects in fluid mechanics. The emphasis is on the applications in different engineering fields rather than on pure mathematical or physical aspects in fluid mechanics. Although many high quality journals pertaining to different aspects of fluid mechanics presently exist, research in the field is rapidly escalating. The motivation for this new fluid mechanics journal is driven by the following points: (1) there is a need to have an e-journal accessible to all fluid mechanics researchers, (2) scientists from third- world countries need a venue that does not incur publication costs, (3) quality papers deserve rapid and fast publication through an efficient peer review process, and (4) an outlet is needed for rapid dissemination of fluid mechanics conferences held in Asian countries. Pertaining to this latter point, there presently exist some excellent conferences devoted to the promotion of fluid mechanics in the region such as the Asian Congress of Fluid Mechanics which began in 1980 and nominally takes place in one of the Asian countries every two years. We hope that the proposed journal provides and additional impetus for promoting applied fluids research and associated activities in this continent. The journal is under the umbrella of the Physics Society of Iran with the collaboration of Isfahan University of Technology (IUT) .