Simulation on Linear-Motor-Driven Water Hydraulic Reciprocating Plunger Pump

2013 ◽  
Vol 842 ◽  
pp. 530-535 ◽  
Author(s):  
Zeng Meng Zhang ◽  
Yong Jun Gong ◽  
Jiao Yi Hou ◽  
Han Peng Wu
Keyword(s):  
Flow Rate ◽  
Deep Sea ◽  
High Efficiency ◽  
Control Method ◽  
Sea Water ◽  
Linear Motor ◽  
Low Flow ◽  
Flow Pulsation ◽  
Plunger Pump ◽  
Water Hydraulic

The water hydraulic reciprocating plunger pump driven by linear motor is suitable to deep sea application with high efficiency and variable control. Aiming to study the principle structure and working characteristics of the pump, two patterns of valve and piston distribution were designed. And the control method and the performance were analyzed by simulation based on the AMESim model. The results show that the pressure and flow pulsation of piston type pump are much smaller than the valve type, even though the piston type is large in scale and works at low flow rate. Compared with a valve distribution tri-linear-motor reciprocating plunger pump (VDTLMP), as the flow rate of the piston distribution double linear motor reciprocating plunger pump (PDDLMP) is decreased from 36.7 L/min to 21.2 L/min theoretically, the pressure pulsation amplitude is decreased from 46% to 2%, and the flow pulsation rate is also decreased from 0.266 to 0.007. These results contribute to the research on deep-sea water hydraulic power pack and direct drive pump with high efficiency and energy conservation.

scholarly journals Reactive Transport and Its Implications on Heavy Oil HTGC Analysis. A Coupled Thermo-Hydro-Chemical (THC) Multiphysics Modelling Approach

2021 ◽  
Author(s):  
Diana Margarita Hernandez-Baez ◽  
Alastair Reid ◽  
Antonin Chapoy ◽  
Bahman Tohidi ◽  
Roda Bounaceur ◽  
...  
Keyword(s):  
Flow Rate ◽  
Heavy Oil ◽  
Reactive Transport ◽  
High Efficiency ◽  
Thermal Cracking ◽  
Low Flow ◽  
Oil Hydrocarbons ◽  
Multiphysics Modelling ◽  
Physics Model ◽  
Modelling Approach

This chapter provides an insight into the reactive transport in a capillary column which heavy-oil hydrocarbons undergo when analysed by high temperature gas chromatography (HTGC), and their implications on characterisation outcomes, namely thermal cracking of the injected sample; and incomplete or non-elution of heavy components from the column, by using a coupled Thermo-Hydro-Chemical (THC) multiphysics modelling approach. For this purpose, a computational coupled THC, multicomponent, multi-physics model is developed, accounting for: multiphase equilibrium using an in-house, extended thermodynamics distribution factors dataset, up to nC98H198; transport and fluid flow in COMSOL and MATLAB; and chemical reactions using kinetics and mechanisms of the thermal cracking, in CHEMKIN. The determination of the former extended dataset is presented using two complementary HTGC modes: i) High-Efficiency mode, with a long column operated at low flow rate; and ii) true SimDist mode, with a short column operated at high flow rate and elution up to nC100H202.

Deterministic Decomposition of the Unsteady Flow in a Unidirectional Axial Turbine for OWC Plant

2018 ◽  
Author(s):  
Nuria Alvarez Bertrand ◽  
Jesús Manuel Fernández Oro ◽  
Bruno Pereiras García ◽  
Manuel García Díaz
Keyword(s):  
Flow Rate ◽  
High Efficiency ◽  
Low Flow ◽  
Oscillating Water Column ◽  
Turbine Stage ◽  
Flow Rates ◽  
Aerodynamic Efficiency ◽  
Axial Turbine ◽  
Deterministic Framework ◽  
Energy Plants

The “twin-turbine” configuration has recently emerged as a feasible possibility for unidirectional turbines to be introduced in Oscillating Water Column wave energy plants without requiring auxiliary rectifying systems. Previous investigations by the authors have been focused on the development of a numerical CFD model to analyze the performance of a unidirectional axial turbine for twin turbine configuration in an OWC system. In this paper, all these numerical databases are further post-processed using a deterministic framework to give more insight about the flow patterns within the turbine. The final objective is the analysis of the unsteady features of the flow and the stator-rotor interactions using a deterministic decomposition. The present study reveals that levels of deterministic unsteadiness in the inter-row region are moderate, being more intense as the flow rate is decreased. Turbulence intensities are also observed to be clearly prominent in case of lower flow rates. Although these findings appear to be contradictory with the high-efficiency low flow rates of the turbine, the major levels of stator-rotor unsteadiness at higher flow rates (shown by the deterministic decomposition) justify the serious penalty in the aerodynamic efficiency as the turbine flow rate is increased. Finally, some advices with respect the design of the vane row in the turbine stage are given to control the generation of turbulence and stator-rotor interaction.

scholarly journals Designing Hydrogen and Oxygen Flow Rate Control on a Solid Oxide Fuel Cell Simulator Using the Fuzzy Logic Control Method

Processes ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 154 ◽  
Author(s):  
Darjat ◽  
Sulistyo ◽  
Aris Triwiyatno ◽  
Sudjadi ◽  
Andra Kurniahadi
Keyword(s):  
Fuzzy Logic ◽  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
Flow Rate ◽  
Output Voltage ◽  
High Efficiency ◽  
Control Method ◽  
Solid Oxide ◽  
Control Voltage ◽  
Oxide Fuel

A solid oxide fuel cell (SOFC) is an electrochemical cell that converts chemical energy into electrical energy by oxidizing fuel. SOFC has high efficiency and cleans oxidation residues. Research has shown the importance of SOFC control. Voltage output control is needed because of nonlinearity, slow dynamics, and proper SOFC operating restrictions. This study aims to design an SOFC simulator with output voltage control to optimize the flow rate of fuel (hydrogen) and air (oxygen). This SOFC simulator is designed based on a microcontroller model. The controller is designed using the fuzzy logic method. Tests show that the output voltage can approach the set point with an average of 340.6 volts. The pressure difference (∆Pressure) between the two gases averaged 4428 Pa, and the fuel/gas flow rate was in the range of 0.7 mol/s. The controller can correct both the output voltage of the SOFC simulator and the difference in gas pressure under 8106 Pa (0.08 atm).

scholarly journals A Novel Z-blade Reaction Type Turbine for Low Head Low Flow Water Condition

2020 ◽  
Vol 9 (3) ◽  
pp. 1370-1374
Keyword(s):  
Flow Rate ◽  
High Efficiency ◽  
Water Flow Rate ◽  
Low Flow ◽  
Practical Case ◽  
Hydro Power ◽  
Small Stream ◽  
Reaction Type ◽  
Water Condition ◽  
Low Head

This paper discusses the performance characteristics on efficiency and applicability of the test unit under low-head and low-flow condition for a novel Z-blade reaction type hydraulic turbine. Unlike large hydro power system, this technology’s superiority lies in the fact that it can harness electrical energy even from a small stream of water as energy sources and it does not poses any adverse environmental impact. This turbine was developed for an ideal and practical case which investigated applying the principal equations that were derived using the philosophies of conservation of mass, momentum, and energy. Assuming frictional losses factor or k-factor for different operating head, the relationship between rotor diameter, angular speed, flow rate, and power output was plotted and elaborated with allusion to the experimental data. Experiments were carried out at 5m head and below with the water flow rate less than 2.5L/sec, and it was evaluated against theoretical results. The turbine has a capability to achieve high values of rotational speed (up to 500 rpm) with minimal mass flow rate and high efficiency (up to 78%) at low head water condition (5m).

scholarly journals Control of Surge in Centrifugal Compressor by Using a Nozzle Injection System: Universality in Optimal Position of Injection Nozzle

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Toshiyuki Hirano ◽  
Takanori Uchida ◽  
Hoshio Tsujita
Keyword(s):  
Flow Rate ◽  
Passive Control ◽  
Control Method ◽  
Rotating Stall ◽  
Low Flow ◽  
Injection System ◽  
Rotational Axis ◽  
Optimal Position ◽  
Injection Nozzle ◽  
Nozzle Injection

The passive control method for surge and rotating stall in centrifugal compressors by using a nozzle injection system was proposed to extend the stable operating range to the low flow rate. A part of the flow at the scroll outlet of a compressor was recirculated to an injection nozzle installed on the inner wall of the suction pipe of the compressor through the bypass pipe and injected to the impeller inlet. Two types of compressors were tested at the rotational speeds of 50,000 rpm and 60,000 rpm with the parameter of the circumferential position of the injection nozzle. The present experimental results revealed that the optimum circumferential position, which most effectively reduced the flow rate for the surge inception, existed at the opposite side of the tongue of the scroll against the rotational axis and did not depend on the compressor system and the rotational speeds.

scholarly journals Deep-sea Water Hydraulic Solenoid Valves Based on TRIZ Theory

2019 ◽  
Vol 55 (16) ◽  
pp. 205
Author(s):  
YANG Yousheng ◽  
TANG Shunjun ◽  
WANG Xiaodong ◽  
FENG Fuzhou
Keyword(s):  
Deep Sea ◽  
Sea Water ◽  
Deep Sea Water ◽  
Water Hydraulic

scholarly journals Effects of Soil Conservation Practices on Sediment Yield from Forest Road Ditches in Northern Iran

2020 ◽  
Vol 41 (2) ◽  
pp. 299-308
Author(s):  
Rasoul Khandouzi ◽  
Aidin Parsakhoo ◽  
Vahedberdi Sheikh ◽  
Aliakbar Mohamadali Pourmalekshah
Keyword(s):  
Flow Rate ◽  
Sediment Yield ◽  
Festuca Arundinacea ◽  
High Efficiency ◽  
Sediment Concentration ◽  
Low Flow ◽  
Road Maintenance ◽  
Northern Iran ◽  
Flow Rates ◽  
Forest Road

The fine-textured soil in forest road ditches is very susceptible to water erosion especially in rainy seasons in Hyrcanian forest. This study examined the yield of ditch segment-scale sediment after releasing two flow rates of 5 l s-1 and 10 l s-1 in segments treated by riprap (RR), grass cover by Festuca arundinacea L. (GC), compacted cotton geotextile (CG) and wooden wattle by local slash (WW). Sediment sampling from the runoff was carried out at the end of each segment every minute. Runoff flow velocity in different treatments was measured using an electromagnetic flow meter. Sediment concentration and runoff velocity in treatments of RR, GC, CG, WW was significantly lower than that of the control plot (Ctl). Increasing flow rate from 5 l s-1 to 10 l s-1 caused no significant change in sediment concentration (except for Ctl and RR) and runoff velocity (except for Ctl and CG), which means that some water might have penetrated into treated soil by RR, GC and WW and this is not acceptable in forest road maintenance practices. Sediment yield from RR (0.36 g l-1) and Ctl (0.50 g l-1) under the flow rate of 10 l s-1 was significantly higher than that of 5 l s-1 with values of 0.21 g l-1 and 0.38 g l-1, respectively. Minimum amount of sediment concentration was observed for CG (0.20 g l-1) with compacted ditch bed. Moreover, runoff velocity in CG and Ctl under the flow rate of 10 l s-1 was significantly higher than that of 5 l s-1. For a forest road with dimension 30×50 cm, slope of 5%, and clay soil with porosity of 57%, treatments of compacted CG can be used in ditch with low flow rates (5 l s-1) and high flow rate (10 l s-1) because of their high efficiency in reducing sediment yield.

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