Study of water turbine pump failure

Abstract The agriculture sector of Nepal has been plagued by problems of poor irrigation networks and infrastructure. This has forced farmers to use fuel and electricity-based pumps, which are both expensive and unsustainable. The problems related to the distribution of power and fluctuating voltages add to the ineffectiveness of the electrical pumping system. So, as a better alternative for environment-friendly and inexpensive irrigation infrastructure, this paper proposes a design methodology of a community-operated hydro-powered pump called water turbine pump (WTP). Although introduced in the 1920s, this technology has been largely ignored nowadays. Moreover, there are insufficient literature and technical documentation to support the design decisions for developers. With an objective to induce momentum in the research and development of this technology, this work presents a well-defined methodology to design a WTP using a propeller turbine directly coupled with a centrifugal pump, in reference to a site located in Bardiya, Nepal. The WTP designed using this methodology could utilize a head of 3 m and a flow rate of 150 lps to deliver 14 lps of water to a height of 14.9 m, yielding a head ratio of 1:5, with an overall efficiency of 50.5%.

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Technique for Improving the Flow Rate Estimation Range by Using an Axial Flow Water Turbine Generator

IEEJ Transactions on Industry Applications ◽

10.1541/ieejias.137.30 ◽

2017 ◽

Vol 137 (1) ◽

pp. 30-35

Author(s):

Hiroaki Narita ◽

Makoto Saruwatari ◽

Jun Matsui ◽

Yasutaka Fujimoto

Keyword(s):

Flow Rate ◽

Axial Flow ◽

Turbine Generator ◽

Rate Estimation ◽

Water Turbine ◽

Estimation Range

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AERODYNAMIC MODELS APPROXIMATE FOR ESTIMATING THE BLADE PERFORMANCE OF A DARRIEUS-TYPE CROSS-FLOW WATER TURBINE

International Journal of Fluid Mechanics Research ◽

10.1615/interjfluidmechres.2019027180 ◽

2020 ◽

Vol 47 (1) ◽

pp. 85-98

Author(s):

Fatima Meddane ◽

Tayeb Yahiaoui ◽

Omar Imine ◽

Lahouari Adjlout

Keyword(s):

Cross Flow ◽

Water Turbine

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Localization Techniques on a 0.15um CMOS Device: Charge Pump Failure Analysis

ISTFA 2002: Conference Proceedings from the 28th International Symposium for Testing and Failure Analysis ◽

10.31399/asm.cp.istfa2002p0771 ◽

2002 ◽

Author(s):

Hui Pan ◽

Thomas Gibson

Keyword(s):

Failure Analysis ◽

Focused Ion Beam ◽

Ion Beam ◽

Electrical Characterization ◽

Charge Pump ◽

Front Side ◽

Pump Failure ◽

Electrical Failure ◽

Optical Proximity Correction ◽

A Charge

Abstract In recent years, there have been many advances in the equipment and techniques used to isolate faults. There are many options available to the failure analyst. The available techniques fall into the categories of electrical, photonic, thermal and electron/ion beam [1]. Each technique has its advantages and its limitations. In this paper, we introduce a case of successful failure analysis using a combination of several fault localization techniques on a 0.15um CMOS device with seven layers of metal. It includes electrical failure mode characterization, front side photoemission, backside photoemission, Focused Ion Beam (FIB), Scanning Electron Microscope (SEM) and liquid crystal. Electrical characterization along with backside photoemission proved most useful in this case as a poly short problem was found to be causing a charge pump failure. A specific type of layout, often referred to as a hammerhead layout, and the use of Optical Proximity Correction (OPC) contributed to the poly level shorts.

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Performance Characteristics in Runner of an Impulse Water Turbine with Splitter Blade

Processes ◽

10.3390/pr9020303 ◽

2021 ◽

Vol 9 (2) ◽

pp. 303

Author(s):

Lingdi Tang ◽

Shouqi Yuan ◽

Yue Tang ◽

Zhijun Gao

Keyword(s):

Energy Conversion ◽

Flow Direction ◽

Mechanical Energy ◽

Experimental Tests ◽

High Energy ◽

Negative Energy ◽

Water Turbine ◽

Conversion Performance ◽

Water Turbines ◽

Current Energy

The impulse water turbine is a promising energy conversion device that can be used as mechanical power or a micro hydro generator, and its application can effectively ease the current energy crisis. This paper aims to clarify the mechanism of liquid acting on runner blades, the hydraulic performance, and energy conversion characteristics in the runner domain of an impulse water turbine with a splitter blade by using experimental tests and numerical simulations. The runner was divided into seven areas along the flow direction, and the power variation in the runner domain was analyzed to reflect its energy conversion characteristics. The obtained results indicate that the critical area of the runner for doing the work is in the front half of the blades, while the rear area of the blades does relatively little work and even consumes the mechanical energy of the runner to produce negative work. The high energy area is concentrated in the flow passage facing the nozzle. The energy is gradually evenly distributed from the runner inlet to the runner outlet, and the negative energy caused by flow separation with high probability is gradually reduced. The clarification of the energy conversion performance is of great significance to improve the design of impulse water turbines.

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Application of an Angular Momentum Balance Method for Investigating Numerical Accuracy in Swirling Flow

Journal of Fluids Engineering ◽

10.1115/1.1595673 ◽

2003 ◽

Vol 125 (4) ◽

pp. 723-730

Author(s):

H. Nilsson ◽

L. Davidson

Keyword(s):

Fluid Dynamics ◽

Computational Fluid Dynamics ◽

Angular Momentum ◽

Swirling Flow ◽

Linear Momentum ◽

Correct Solution ◽

Momentum Balance ◽

Numerical Accuracy ◽

Water Turbine ◽

Water Turbines

This work derives and applies a method for the investigation of numerical accuracy in computational fluid dynamics. The method is used to investigate discretization errors in computations of swirling flow in water turbines. The work focuses on the conservation of a subset of the angular momentum equations that is particularly important to swirling flow in water turbines. The method is based on the fact that the discretized angular momentum equations are not necessarily conserved when the discretized linear momentum equations are solved. However, the method can be used to investigate the effect of discretization on any equation that should be conserved in the correct solution, and the application is not limited to water turbines. Computations made for two Kaplan water turbine runners and a simplified geometry of one of the Kaplan runner ducts are investigated to highlight the general and simple applicability of the method.

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