Experimental investigation on the corrosion behavior of Al3Ti-based intermetallic compounds in nuclear reactor normal operation conditions

2015 ◽  
Vol 467 ◽  
pp. 607-611 ◽  
Author(s):  
Jeong-Yong Park ◽  
Il-Hyun Kim ◽  
Hyun-Gil Kim ◽  
Yang-Il Jung ◽  
Dong-Jun Park ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Intermetallic Compounds ◽  
Corrosion Behavior ◽  
Nuclear Reactor ◽  
Normal Operation ◽  
Operation Conditions

scholarly journals TURBOVENTILIATORIŲ, VEIKIANČIŲ BE VĖJO SRAUTO, EKSPERIMENTINIS TYRIMAS / EXPERIMENTAL INVESTIGATION OF TURBOVENTILATORS OPERATING WITHOUT WIND FLOW

2018 ◽  
Vol 10 (0) ◽  
pp. 1-5
Author(s):  
Dovydas Rimdžius ◽  
Juozas Bielskus
Keyword(s):  
Experimental Investigation ◽  
Energy Demand ◽  
High Efficiency ◽  
Normal Operation ◽  
Wind Flow ◽  
Wind Speeds ◽  
Energy Technologies ◽  
Operation Conditions ◽  
Low Wind Speeds ◽  
Ventilation Systems

Fans used in modern buildings ventilation systems make up a large part of the building‘s total energy demand. In order to ensure proper air quality and high efficiency of ventilation systems, it is necessary to search new solutions. One of the possible ways is to use renewable energy technologies. Currently it is a widespread use of wind energy in turboventilators. Major part of previous researches are related to tests of different construction turboventilators, determination of their characteristics and analysis of results. However, assessment of the current researches situation indicates the lack of fundamental researches of air flows interaction processes impact to turboventilators efficiency. In addition, researchers on hybrid turboventilators still search for solutions to increase the ventilation functionality when there is not enough wind power for operation of these devices. In order to determine the significance of these processes in more detail, in the present study, two different types of turboventilators are experimentally tested in two different ways. In one case, their rotors are rotated by an additional source of energy, in another case they are tested under different wind speed conditions. The aim of research is to assess not only the characteristics of the testes devices under normal conditions, but also their ventilation potential without wind flow. The results of experimental investigation showed that under normal operation conditions of the device, a large part of the extracted air flow is impacted by rotor rotation and ejection phenomenon. Empirical equations and investigation results presented in the paper can be useful for comparing other experiments and improving the functionality of the device at low wind speeds. Santrauka Šiuolaikinių pastatų vėdinimo sistemose naudojami ventiliatoriai sudaro didelę dalį pastato bendrojo energijos poreikio. Siekiant užtikrinti tinkamą oro kokybę ir aukštą vėdinimo sistemų efektyvumą, būtina ieškoti naujų sprendimų. Vienas iš galimų būdų – atsinaujinančią energiją naudojančių technologijų taikymas. Šiuo metu plačiai paplitęs būdas naudoti vėjo energiją turboventiliatoriuose. Didžioji dalis ankstesniuose moksliniuose tyrimuose atliktų eksperimentų susiję su skirtingų konstrukcijų turboventiliatorių bandymais, jų charakteristikų nustatymu ir rezultatų palyginimu. Visgi, vertinant esamą mokslinių tyrimų situaciją, pastebima, jog trūksta fundamentalių tyrimų nagrinėjant oro srautų sąveikos procesų įtaką turboventiliatorių efektyvumui. Be to, atliekamuose tyrimuose su hibridiniais tokio tipo įrenginiais tebeieškoma sprendimų, kaip padidinti vėdinimo funkcionalumą, kai nepakanka vėjo srauto įrenginiui veikti. Siekiant detaliau nustatyti minėtų procesų svarbą, pristatomame tyrime dviem skirtingais metodais eksperimentiškai bandomi du skirtingo tipo turboventiliatoriai. Vienu atveju jų rotoriai sukami papildomu energijos šaltiniu, kitu atveju bandomi skirtingomis vėjo greičių sąlygomis. Tyrimų metu siekiama įvertinti ne tik bandomų įrenginių charakteristikas veikiant įprastomis sąlygomis, bet ir jų vėdinimo potencialą be vėjo srauto. Eksperimentinių tyrimų rezultatai parodė, jog įrenginiui veikiant įprastomis sąlygomis didelė dalis ištraukiamojo oro srauto veikiama rotorių sukimosi bei ežekcijos reiškinio. Straipsnyje pateiktos empirinės lygtys ir tyrimo rezultatai gali būti naudingi lyginant kitus eksperimentus bei tobulinant įrenginio funkcionalumą esant mažam vėjo greičiui.

scholarly journals Experimental Evaluation of Turbine Ventilators Performance under Different Test Conditions

2018 ◽  
Vol 64 ◽  
pp. 07003
Author(s):  
Rimdžius Dovydas ◽  
Bielskus Juozas ◽  
Martinaitis Vytautas ◽  
Motuzienė Violeta ◽  
Streckienė Giedrė
Keyword(s):  
Experimental Investigation ◽  
Major Part ◽  
Interaction Process ◽  
Normal Operation ◽  
Experimental Investigations ◽  
Empirical Equations ◽  
Air Flow Rate ◽  
Operation Conditions ◽  
Test Conditions ◽  
Main Construction

One of the most popular wind driven ventilation devices is a turbine ventilator. Its main construction components usually are air suction duct and impeller. However, there are many different configurations of such devices – different shape of vanes and ratios between main dimensions. In order to develop turbine ventilators there is demand for deeper fundamental researches. Major part of previous experimental investigations compares turbine ventilators performance. The aim of presented experimental investigation is to understand key parameters affecting wind driven ventilators performance. For this purpose, straight and curved vane devices under 4 different test conditions are tested. All tests are performed in modified wind tunnel based on the following methodology: 1) testing devices under normal operation conditions; 2) testing without impeller; 3) testing while impeller is stopped; 4) testing while air suction duct is sealed. Experimental results have shown that the biggest part of extracted air flow rate is impacted due to ejection of wind and air suction duct interaction process. A slight increase in performance of turbine ventilators compared to open duct column has been confirmed. Experiments also revealed differences between tested turbine ventilators rotational speed trends. Presented empirical equations of experiments could be used for design of turbine ventilators or other researches purposes.

scholarly journals Criticality safety analysis of spent fuel pool for a PWR using UO2, MOX, (Th-U)O2 and (TRU-Th)O2 fuels

2019 ◽  
Vol 7 (3A) ◽  
Author(s):  
Claubia Pereira ◽  
Jéssica P. Achilles ◽  
Fabiano Cardoso ◽  
Victor F. Castro ◽  
Maria Auxiliadora F. Veloso
Keyword(s):  
Normal Operation ◽  
Pressurized Water Reactor ◽  
Spent Fuel ◽  
Pressurized Water ◽  
Operation Conditions ◽  
Transport Code ◽  
Uranium Fuel ◽  
Fuel Assemblies ◽  
Spent Fuel Pool ◽  
Criticality Safety

A spent fuel pool of a typical Pressurized Water Reactor (PWR) was evaluated for criticality studies when it uses reprocessed fuels. PWR nuclear fuel assemblies with four types of fuels were considered: standard PWR fuel, MOX fuel, thorium-uranium fuel and reprocessed transuranic fuel spiked with thorium. The MOX and UO2 benchmark model was evaluated using SCALE 6.0 code with KENO-V transport code and then, adopted as a reference for other fuels compositions. The four fuel assemblies were submitted to irradiation at normal operation conditions. The burnup calculations were obtained using the TRITON sequence in the SCALE 6.0 code package. The fuel assemblies modeled use a benchmark 17x17 PWR fuel assembly dimensions. After irradiation, the fuels were inserted in the pool. The criticality safety limits were performed using the KENO-V transport code in the CSAS5 sequence. It was shown that mixing a quarter of reprocessed fuel withUO2 fuel in the pool, it would not need to be resized 

scholarly journals Vestas V90-3MW Wind Turbine Gearbox Health Assessment Using a Vibration-Based Condition Monitoring System

2016 ◽  
Vol 2016 ◽  
pp. 1-18 ◽  
Author(s):  
A. Romero ◽  
Y. Lage ◽  
S. Soua ◽  
B. Wang ◽  
T.-H. Gan
Keyword(s):  
Fault Diagnosis ◽  
Wind Turbine ◽  
Condition Monitoring ◽  
Learning Algorithm ◽  
Health Assessment ◽  
Field Trials ◽  
Health Condition ◽  
Normal Operation ◽  
Wind Turbine Gearbox ◽  
Operation Conditions

Reliable monitoring for the early fault diagnosis of gearbox faults is of great concern for the wind industry. This paper presents a novel approach for health condition monitoring (CM) and fault diagnosis in wind turbine gearboxes using vibration analysis. This methodology is based on a machine learning algorithm that generates a baseline for the identification of deviations from the normal operation conditions of the turbine and the intrinsic characteristic-scale decomposition (ICD) method for fault type recognition. Outliers picked up during the baseline stage are decomposed by the ICD method to obtain the product components which reveal the fault information. The new methodology proposed for gear and bearing defect identification was validated by laboratory and field trials, comparing well with the methods reviewed in the literature.

Experimental investigation on the coolability of nuclear reactor debris beds using seawater

2022 ◽  
Vol 184 ◽  
pp. 122347
Author(s):  
Zayed Ahmed ◽  
Chance Jordan ◽  
Prashant Jain ◽  
Kevin Robb ◽  
Hitesh Bindra ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Nuclear Reactor

Safety of Nuclear Reactors: Part A — Unsteady State Temperature History Mathematical Model

2004 ◽  
Author(s):  
Mohamed El-Shayeb ◽  
Mohd. Zamri Yusoff ◽  
Mohd Hariffin Boosroh ◽  
Ali Bondok ◽  
Fazril Ideris ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Nuclear Reactor ◽  
Nuclear Radiation ◽  
Normal Operation ◽  
Temperature History ◽  
Unsteady State ◽  
Operation Temperature ◽  
History Effects ◽  
Tremendous Amount ◽  
Relevant Material

A nuclear reactor structure under abnormal operations of near meltdown will be exposed to a tremendous amount of heat flux in addition to the stress field applied under normal operation. Temperature encountered in such case is assumed to be beyond 1000°C. A mathematical model has been developed for the fire resistance calculation of a concrete-filled square steel column with respect to its temperature history. Effects due to nuclear radiation and mechanical vibrations will be explored in a later future model. The temperature rise in each element can be derived from its heat balance by applying the parabolic unsteady state, partial differential equation and numerical solution into the steel region. Calculation of the temperature of the elementary regions needs to satisfy the symmetry conditions and the relevant material properties. The developed mathematical model is capable to predict the temperature history in the column and on the surface with respect to time.

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