Revista HIDRAULICA | HIDRAULICA Magazine

ISSN 2343–7707 ; ISSN-L 1453-7303

HIDRAULICA Magazine No. 1 / 2014

 


cop1 mica


EDITORIAL

TIMES OF CHANGE
Gabriela MATACHE 
Editor-in-Chief

We are going through times of change; a chaotic change, not so well defined by those who want to do it. We put personal interests above the interests of the group; promote nepotism and mediocrity prior to capacity and excellence. They spend time and money with “European experts” who are not competent and do not have the willingness to objectively assess projects submitted long ago.….(read more)


CFD MODEL OF FLOW IN THE OUTLET CHANNEL OF FLOATING CHAMBER 
Authors: Karol STRAČÁR, Jozef KRCHNÁR, Karol PRIKKEL

The dynamical component from the flowing fluid will be determined by numerical simulations by means of CFD methods that are a necessary supplement of experiments on a real outlet object. They help us describe the effect of the flow on the regulatory closures segment of the outlet channel of a floating chamber…(read more)


BIOMASS COMBINED HEAT AND POWER DFIG CONCEPT CIGRE BENCHMARK NETWORK IMPACT
Authors: Ioan CURAC, Viorel TRIFA, Bogdan Ionut CRACIUN

The market of distributed energy resources (DER) is growing continually and powerfully. Because of this intense growth, the electric power system of centrally located generation, transmission networks and distribution networks is expected to evolve into an infrastructure where small-scale distributed energy resources and loads, connected through local micro grids, are common…(read more)

MATERIAL REQUIREMENTS PLANNING, INVENTORY CONTROL SYSTEM IN INDUSTRY
Authors: Marin RUSĂNESCU

Many practitioners, managers and researchers have raised the question of how you can control stocks. These issues were made in the form of questions, to which answers must be found. The questions were: What items should I keep in stock? Because the stock is expensive and you have to have exactly what you should do. When I do an order? How much should I order?…(read more)


THE LUBRICATION IN HIP JOINT
Authors: Andrea HARINGOVÁ, Karol PRIKKEL, Karol STRAČÁR

The lubrication in the hip joint depends on the properties of liquid used for it. In the human body we could find as the lubricant hyaluronic acid in the liquid called synovial fluid. The properties of this fluid depends on the shear rate and film thickness. The type of the lubrication is determined by Stribeck curve…(read more)


NUMERICAL MODELING OF VISCOUS FLUID FLOW BY SEALING LABYRINTHS
Authors: Sanda BUDEA, Ştefan SIMIONESCU

This paper analyzes the laminar flow of viscous fluids through interstices in order to properly design the labyrinth seals between the rotor and the housing and improve the volumetric efficiency of turbomachines. In order to increase the volumetric efficiency of centrifugal turbomachines, especially at relatively small flow…(read more)


INFLUENCE OF CHEMICAL COMPOSITION ON HARDENING PROCESSES, CORRESPONDING  FOR ALUMINUM ALLOYS 2024 USED AT HYDRAULIC EQUIPMENT
Authors: Vasile BRATU, Florina Violeta  ANGHELINA

Compositional analysis of conventional metallic materials (alloys based on Fe, Al, Cu, Co, Ni, etc.) is almost exclusively taken out by spectrometry  OES[1,2,3,4,5]. Compositional analysis of special metal materials incumbent special dosing methods and techniques that ensure quality test results as required the estimation their conformity with requirements…(read more)


THE FLOW MODELING ON THE CYLINDER VALVE
Authors: Iulian FLORESCU, Daniela FLORESCU

Cylinder valve or Johnson cylinder valve after its inventor’s name, has a central cylindrical ends placed coaxially surrounded by hydrodynamic flow of water rotationally symmetric, which is fixed to the housing by transverse frames in the form of wings…(read more)


MICROSTRUCTURE AND TRIBOLOGICAL CHARACTERISTICS OF BIOCOMPATIBLE 316 L STAINLESS STEEL
Authors: Florina VIOLETA ANGHELINA, Vasile BRATU

The 316L steel was created in the 1950s by reducing the carbon content from 0.08% to 0.03% in order to better corrosion resistance. Type 316L steel is steel sheets, strips, plates, standardized according to ASTM A240. The outdoor melting steel 316L can lead to contamination and, in consequence…(read more)


AUTOMATION OF A PUMPING STATION FOR LOW POWER APPLICATIONS
Authors: Laurentiu ALBOTEANU, Gheorghe MANOLEA, Alexandru NOVAC

Starting and stopping the pumps in a pump station can provide manual, semi-automatic and automatic. Due to the high consumption of electricity, the need for continuous surveillance and danger of malfunction, start and stop manual pump is completely abandoned…(read more)

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