Visualization of a highly submerged cavitating water jet was done by high-speed camera photography in order to study and understand the structure behavior cloud cavitation within time space. The influencing parameters, such as injection pressure, nozzle diameter geometry, direction (convergent divergent), were experimentally proven be very significant. Periodical shedding discharging clouds have been also analyzed corresponding frequency determined shape analysis. Additionally, dependence...

High-speed visualization and subsequent statistical analysis of a high-speed cavitating water jet were performed with custom image acquisition processing system. In jet, cavity clouds form collapse an unsteady, periodic tendency where the frequency depends on flow conditions. The aim presented investigations was to examine analyse dynamic behaviour these understand effect influencing experimental working conditions, such as injection pressure, nozzle geometry shape (convergent or divergent)...

Abstract In a cavitating water jet, cavity clouds emerge and collapse with an unsteady, but periodic tendency where the frequencies depend on working conditions. The presented work aims at examining analyze dynamic behavior properties of under different circumstances. Computer vision image processing were introduced as tools to define cavitation based Contour Recognition technique. A Canny operator Otsu threshold fragmenting methods used. use these allows for better understanding jet clouds'...

A fast and robust predictive current controller for reduction of flicker caused by dc electric arc furnaces (EAFs) supplied thyristor converters is presented in this paper. During normal EAF operation, large active- reactive-power variations can occur at the point furnace connection, causing unwanted network voltage correspondingly a phenomenon. The main cause phenomenon are electrode short-circuits with swings, which during so-called bore-in period cycle. proposed reduces mainly providing...

Based on visualization results of highly-submerged cavitating water jet obtained with digital camera, the influences related parameters such as: injection pressure, nozzle diameter and geometry, mounting (for convergent / divergent flow), cavitation number exit velocity, were investigated. In addition, influence system position was also studied. All have been found to be strong appearance performance. Both hydro-dynamical geometrical are playing main role in behavior intensity phenomenon...

The predictive current controller presented in this paper provides fast control for thyristor converters without relying on the accurate load model. Unlike load-model-based methods of control, method does not use parameters calculations firing angle. Instead, thyristors are fired when sum measured instantaneous and rise, which is predicted from voltage-time area dc-side inductor, equal to reference. This way, achieved just by knowing inductor measuring line voltages, current, voltage....

This paper describes a study case of student production laboratory model for engineering education and its integration in the local remote laboratory. Students guided by teaching staff are passing through all phases development testing product. In our case, should produce test fan. part concerning with courses Hydraulic Pneumatic Machinery, which incorporates, besides fundamental courses, subjects related to theory, construction, design hydraulic machines (pumps, fans, turbines)...

In order to study jet structure and behaviour of cloud cavitation within time space, visualization highly submerged cavitating water has been done using Stanford Optics 4 Quick 05 equipment, through endoscopes other lenses with Drello3244 Strobex Flash Chadwick as flashlight stroboscope. This included obligatory synchronization several types techniques lenses. Images the flow regime have taken, allowing calculation non-dimensional length under working conditions. Consequently a certain...

Geometry analysis of the axial fan impeller, experimentally obtained operating characteristics and experimental investigations turbulent swirl flow generated behind impeller are presented in this paper. Formerly designed manufactured, blade geometry (originally by Prof. Dr-Ing. Z. Protic?) has been digitized using a threedimensional (3D) scanner. In parallel, same modeled beta version software for modeling turbomachines, based on modified classical calculation. These results were compared....

Fluid machinery courses demand, besides theoretical approach, also good practice and laboratory exercises. After course completion, students should be aware of all aspects possible problems. Focus this paper is on hydraulic pumps designed demonstrational-educational test rig. It to demonstrate educate in following: Bernoulli equation, Euler equation for turbomachinery, losses, Venturi flow meter - geometry measurements, cavitation swirling phenomena, as well practical issues such pump...

The principal focus of this investigation were the effect hydrodynamic and geometrical parameters on cavitating jet dynamic power cavitation intensity under different flow conditions. Jet performance indicators taken to be erosion rate target surface size area.. In addition, visualization was used as an additional tool demonstrate characteristics. results show that can indicator strength impinging establish a correlation between pertinent experimental parameters. importance non-dimensional...

Educational setup for demonstration of a pump operation and determination full performance curves is presented. The upgrade the has been done in order to implement electronic measurements, data acquisition, computer control, preparation all necessary hardware elements remote via Internet. Used equipment, rationale behind, characteristics possibilities current status discussed detail.

This part of the paper presents relation between working conditions, nozzle geometry, diameter, and jet behavior. Experimental work has been made by impinging submerged jets on copper specimen as a target for period time. The mass loss erosion rate at various conditions were measured, calculated analyzed. For visualization, high-speed camera was used obtained data processed to measure parameters which are characterize clouds. Correlations among dynamic power, cavity length, rate, pertinent...

The analysis conducted in this paper was initiated by the fact that Serbia emitted around 80 million tons of CO2, equivalent 1990, and between 85-89 2010, which places it among ten countries with highest emission CO2 per capita world (data Cener for Ecology Sustainable Development, Subotica, Serbia). This is aimed at making a correlation improvement thermal performance structural elements buildings order to enhance their energy efficiency, also economically justified, reduction GHG (CO2)...

This paper presents the dependency of jet power and cavitation intensity on working conditions cavitating non-cavitating flow. is indicated by erosion process flow structure. The effects were experimentally investigated. visualization was done using a high-speed photography recording system. analysis shows that rate calculation structure can be used as tools to estimate strength, actions, power, performance jetting