Fasteners. Hexalobular socket countersunk head screws, high head

Oxygen is an important component of water quality and its ability to sustain life. Water aeration is the process of introducing air into a body of water to increase its oxygen saturation. Water aeration can be accomplished in a variety of ways, for instance, closed-conduit aeration. High-speed flow in a closed conduit involves air-water mixture flow. The air flow results from the subatmospheric pressure downstream of the gate. The air entrained by the high-speed flow is supplied by the air vent. The air entrained into the flow in the form of a large number of bubbles accelerates oxygen transfer and hence also increases aeration efficiency. In the present work, the optimum air-demand ratio for maximum aeration efficiency in high-head gated circular conduits was studied experimentally. Results showed that aeration efficiency increased with the air-demand ratio to a certain point and then aeration efficiency did not change with a further increase of the air-demand ratio. Thus, there was an optimum value for the air-demand ratio, depending on the Froude number, which provides maximum aeration efficiency. Furthermore, a design formula for aeration efficiency was presented relating aeration efficiency to the air-demand ratio and Froude number.

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On the Improvement in the Suction Performance of High-Head Axial-Flow Pumps

Bulletin of JSME ◽

10.1299/jsme1958.11.1056 ◽

1968 ◽

Vol 11 (48) ◽

pp. 1056-1067

Author(s):

Taijiro KASAI ◽

Sigenori MATSUNAGA ◽

Yukio KUNIKIYO ◽

Haruo ISIBASI

Keyword(s):

Axial Flow ◽

High Head ◽

Suction Performance

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Research on the Key Technology of Exploiting and Waterflooding in One Well with ESP

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.655-657.113 ◽

2013 ◽

Vol 655-657 ◽

pp. 113-116

Author(s):

Dai Liang Luo ◽

Yong Fa Qiu ◽

Wei Bing Xie ◽

Guo Qiang Dong

Keyword(s):

Lower Layer ◽

Structure Design ◽

Pipe Network ◽

Pipeline Transportation ◽

Key Technology ◽

Transportation Distance ◽

High Head ◽

Downhole Monitoring ◽

Oilfield Development ◽

Fringe Area

The waterflooding development of Oilfield fringe area and scattered blocks are restricted by the existing pipe network design and pipeline transportation distance and so on. In order to improve the development effect of these blocks, by using advantages of ESP including high head, range capacity and mature technology, technology of exploiting and waterflooding in one well with ESP was discussed. Then, some key problems were settled such as sand prevention, sealing, downhole monitoring of process parameters, structure design and so on, and three process schemes were summarized including exploiting the upper layer and waterflooding the lower layer, exploiting the lower layer and waterflooding the upper layer and downhole pressurized injection. The technology proposed by this article has achieved good results proved by field applications. The success of the technology provides an economical and reliable energy supply technology for oilfield development, and has a broad market prospect.

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High Head Hydro Powerplant Evaluation

Journal of Energy Engineering ◽

10.1061/(asce)0733-9402(1986)112:3(153) ◽

1986 ◽

Vol 112 (3) ◽

pp. 153-167 ◽

Cited By ~ 2

Author(s):

J. L. Gordon ◽

P. C. Helwig ◽

L. G. Sturge

Keyword(s):

High Head

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“IRIS” A Computerized High Head Pump Turbine Design System

Journal of Fluids Engineering ◽

10.1115/1.3448848 ◽

1977 ◽

Vol 99 (3) ◽

pp. 567-577

Author(s):

S. Chacour ◽

J. E. Graybill

Keyword(s):

Mechanical Design ◽

Design Parameters ◽

Design System ◽

Performance Requirements ◽

Manufacturing Process Planning ◽

Depth Analysis ◽

High Head ◽

Critical Components ◽

Limited Input Data ◽

Turbine Design

“IRIS” is a computerized design and structural optimization system capable of generating all the major hydraulic and mechanical design parameters of high head pump/turbines from limited input data. The program will size the unit and select the proper hydraulic passage configuration according to performance requirements and optimize the dimensions of all the major components, generate command tapes used by a numerically controlled flame cutter, estimate cost, and issue manufacturing process planning. It also generates finite element models for the “in depth” analysis of critical components.

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Experimental research on flow field of high head pump turbine based on PIV test

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/627/1/012016 ◽

2021 ◽

Vol 627 ◽

pp. 012016

Author(s):

D M Liu ◽

L B Ma ◽

N Li ◽

Y Z Zhao ◽

Huan Cheng

Keyword(s):

Flow Field ◽

Experimental Research ◽

Pump Turbine ◽

High Head

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Analysis of Flow Instabilities on a Three-Bladed Axial Inducer in Fixed and Rotating Frames

Journal of Fluids Engineering ◽

10.1115/1.4041731 ◽

2018 ◽

Vol 141 (4) ◽

Cited By ~ 1

Author(s):

Giovanni Pace ◽

Dario Valentini ◽

Angelo Pasini ◽

Ruzbeh Hadavandi ◽

Luca d'Agostino

Keyword(s):

Low Frequency ◽

Flow Instabilities ◽

Test Facility ◽

Pressure Measurements ◽

Dynamic Characterization ◽

Rotating Frames ◽

Induced Flow ◽

High Head ◽

Pump Inlet

The paper describes the results of recent experiments carried out in the Cavitating Pump Rotordynamic Test Facility for the dynamic characterization of cavitation-induced flow instabilities as simultaneously observed in the stationary and rotating frames of a high-head, three-bladed axial inducer with tapered hub and variable pitch. The flow instabilities occurring in the eye and inside the blading of the inducer have been detected, identified, and monitored by means of the spectral analysis of the pressure measurements simultaneously performed in the stationary and rotating frames by multiple transducers mounted on the casing near the inducer eye and on the inducer hub along the blade channels. An interaction between the unstable flows in the pump inlet and in the blade channels during cavitating regime has been detected. The interaction is between a low frequency axial phenomenon, which cyclically fills and empties each blade channel with cavitation, and a rotating phenomenon detected in the inducer eye.

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