An experimental study on the thermal-hydraulic phenomena in the Hybrid Safety Injection Tank using a separate effect test facility

2016 ◽  
Vol 92 ◽  
pp. 211-227 ◽  
Author(s):  
Sung Uk Ryu ◽  
Hyobong Ryu ◽  
Hyun-Sik Park ◽  
Sung-Jae Yi
Keyword(s):  
Experimental Study ◽  
Test Facility ◽  
Separate Effect ◽  
Effect Test

scholarly journals Trace Code Validation for BWR Spray Cooling Injection and CCFL Condition Based on GÖTA Facility Experiments

2012 ◽  
Vol 2012 ◽  
pp. 1-17 ◽  
Author(s):  
Stefano Racca ◽  
Tomasz Kozlowski
Keyword(s):  
Spray Cooling ◽  
Test Facility ◽  
The Past ◽  
Code Validation ◽  
Best Estimate ◽  
Separate Effect ◽  
Input Parameters ◽  
Effect Test

Best estimate codes have been used in the past thirty years for the design, licensing, and safety of NPP. Nevertheless, large efforts are necessary for the qualification and the assessment of such codes. The aim of this work is to study the main phenomena involved in the emergency spray cooling injection in a Swedish-designed BWR. For this purpose, data from the Swedish separate effect test facility GÖTA have been simulated using TRACE version 5.0 Patch 2. Furthermore, uncertainty calculations have been performed with the propagation of input errors method, and the identification of the input parameters that mostly influence the peak cladding temperature has been performed.

Effect of ECC Injection Angle on the Flow Distribution in a Downcomer Annulus During LBLOCA Reflood Phase in the Air-Water Test

2002 ◽  
Author(s):  
T. S. Kwon ◽  
B. J. Yun ◽  
C. H. Song ◽  
K. Y. Choi ◽  
H. K. Cho
Keyword(s):  
Water Column ◽  
Nuclear Reactor ◽  
Flow Distribution ◽  
Test Facility ◽  
Test Results ◽  
Injection Angle ◽  
Air Jet ◽  
Separate Effect ◽  
Water Test ◽  
Effect Test

The comparison tests for the direct ECC bypass fraction were experimentally performed with a typical DVI nozzle and an ECC column nozzle having injection angle to the gravity axis. The ECC column nozzle is newly introduced to make an ECC water column in the downcomer region. The injection angle of the ECC water relative to the gravity axis is varied from 0 to ±90 degrees stepped by 45 degrees. The tests are performed in the air-water separate effect test facility (DIVA), which is 1/7.07 linearly scaled-down of the APR1400 nuclear reactor. The test results show that the direct ECC bypass fraction is affected by the ECC injection angle when the ECC water is injected using an ECC column nozzle as a single water column. The injection angle of an ECC water column relative to the circumferential air jet in the DVI system affects the direct ECC bypass fraction during the reflood phase of a LBLOCA.

Experimental Study on the Effect of Clocking on the Propagation of Inflow Pressure Distortions in a Low Pressure Turbine Stage

2020 ◽  
Author(s):  
L. Simonassi ◽  
M. Zenz ◽  
P. Bruckner ◽  
S. Pramstrahler ◽  
F. Heitmeir ◽  
...  
Keyword(s):  
Experimental Study ◽  
Flow Field ◽  
Total Pressure ◽  
Low Pressure ◽  
Vibration Characteristics ◽  
Test Facility ◽  
Turbine Stage ◽  
Rotor Vibration ◽  
Low Pressure Turbine ◽  
The Impact

Abstract The design of modern aero engines enhances the interaction between components and facilitates the propagation of circumferential distortions of total pressure and temperature. As a consequence, the inlet conditions of a real turbine have significant spatial non-uniformities, which have direct consequences on both its aerodynamic and vibration characteristics. This work presents the results of an experimental study on the effects of different inlet total pressure distortion-stator clocking positions on the propagation of total pressure inflow disturbances through a low pressure turbine stage, with a particular focus on both the aerodynamic and aeroelastic performance. Measurements at a stable engine relevant operating condition and during transient operation were carried out in a one and a half stage subsonic turbine test facility at the Institute of Thermal Turbomachinery and Machine Dynamics at Graz University of Technology. A localised total pressure distortion was generated upstream of the stage in three different azimuthal positions relative to the stator vanes. The locations were chosen in order to align the distortion directly with a vane leading edge, suction side and pressure side. Additionally, a setup with clean inflow was used as reference. Steady and unsteady aerodynamic measurements were taken downstream of the investigated stage by means of a five-hole-probe (5HP) and a fast response aerodynamic pressure probe (FRAPP) respectively. Strain gauges applied on different blades were used in combination with a telemetry system to acquire the rotor vibration data. The aerodynamic interactions between the stator and rotor rows and the circumferential perturbation were studied through the identification of the main structures constituting the flow field. This showed that the steady and unsteady alterations created by the distortion in the flow field lead to modifications of the rotor vibration characteristics. Moreover, the importance of the impact that the pressure distortion azimuthal position has on the LPT stage aerodynamics and vibrations was highlighted.

Development of a pump performance model for an integral effect test facility

2008 ◽  
Vol 238 (10) ◽  
pp. 2614-2623 ◽  
Author(s):  
Ki-Yong Choi ◽  
Yeon-Sik Kim ◽  
Sung-Jae Yi ◽  
Won-Pil Baek
Keyword(s):  
Performance Model ◽  
Test Facility ◽  
Pump Performance ◽  
Integral Effect ◽  
Effect Test

Uncertainty Quantification of the RELAP5 Interfacial Friction Model in the Rod Bundle Geometry

2014 ◽  
Author(s):  
Ikuo Kinoshita ◽  
Toshihide Torige ◽  
Minoru Yamada
Keyword(s):  
Model Uncertainty ◽  
Numerical Analyses ◽  
Test Facility ◽  
Interfacial Friction ◽  
Two Phase ◽  
Friction Coefficients ◽  
Oak Ridge ◽  
Rod Bundle ◽  
Separate Effect ◽  
Phase Mixture

An application of the Best Estimate Plus Uncertainty (BEPU) method is made to an analysis of the “Intentional depressurizaion of steam generator secondary side” which is an accident management procedure in a small-break loss-of-coolant accident (SBLOCA) with high pressure injection (HPI) system failure. RELAP5/MOD3.2 is used as the system analysis code. Interfacial friction in the core affects the two-phase mixture level and the distribution of the dispersed gas phase. This phenomenon is very important in terms of the influence its uncertainty has on the peak cladding temperature. The RELAP5/MOD3.2 code uses drift-velocity to describe the interfacial friction coefficients in vertical dispersed flow. The Chexal-Lellouche drift-flux correlation is used for the rod bundle geometry. In the present study, the RELAP5 model uncertainty was quantified regarding the interfacial friction coefficients in the rod bundle geometry by conducting numerical analyses of separate effect tests. As the separate effect tests, two-phase mixture level swell tests in the Thermal Hydraulic Test Facility (THTF) of the Oak Ridge National Laboratory (ORNL) were used. After considering applicability to the SBLOCA, tests were selected for which conditions of pressures and rod powers were similar to PWR plant conditions. A total of 55 data were used. The model uncertainty parameter was defined as a multiplier for the interfacial friction coefficient. Numerical analyses were performed by adjusting the multiplier so that the predicted void fractions agreed with the experimental measured data. The resultant distribution of the multipliers represented the model uncertainty. The mean, standard deviation, minimum and maximum values of this uncertainty distribution were 0.88, 0.55, 0.13 and 3.0, respectively.

Experimental Study of Surrogate Particle Transport and Deposition in a Square Channel Using Particle Tracking Technique

2019 ◽  
Author(s):  
Daniel Orea ◽  
Thien Nguyen ◽  
Rodolfo Vaghetto ◽  
N. K. Anand ◽  
Yassin A. Hassan ◽  
...  
Keyword(s):  
Experimental Study ◽  
Fluid Flow ◽  
Particle Tracking ◽  
Particle Transport ◽  
Particle Deposition ◽  
Numerical Study ◽  
Flow Characteristics ◽  
Test Facility ◽  
Square Channel ◽  
Fluid Flow Characteristics

Abstract This paper presents an experimental study of hydrodynamics flow characteristics and particle transport in a test facility. Experimental measurements of fluid flow and particle deposition are studied under isothermal conditions using particle image velocimetry (PIV) and particle tracking velocimetry (PTV) techniques. These non-intrusive optical measurement techniques have been applied in experiment conditions of Reynolds number Re = 5,077 in a 3-inch square channel and 72-inches in total length. The fluid within the channel is air seeded with aerosol droplets while the measurements of particle transport is facilitated using surrogate particles dispersed in the channel flow. Results obtained from the PIV and PTV measurements included the hydrodynamics fluid flow characteristics, and characteristics of particle transports, such as particle velocity, particle diameter distributions and particle concentration profiles. Results from the preliminary test have shown 11.08% deposition of particles. To supplement this experimental work, upstream fluid flow characteristics were provided as boundary conditions for a comparable numerical study.

HTR fuel coating separate effect test PYCASSO

2010 ◽  
Vol 240 (10) ◽  
pp. 2392-2400 ◽  
Author(s):  
Sander de Groot ◽  
Pierre Guillermier ◽  
Kazuhiro Sawa ◽  
Jean-Michel Escleine ◽  
Shohei Ueta ◽  
...  
Keyword(s):  
Separate Effect ◽  
Effect Test

Experimental Study of Threaded and Grooved Radiating Pin Fin

2007 ◽  
Author(s):  
J. Ganesh Murali ◽  
S. Katte Subrahmanya
Keyword(s):  
Heat Transfer ◽  
Experimental Study ◽  
Steady State ◽  
Vacuum Chamber ◽  
Unit Mass ◽  
Test Facility ◽  
Temperature Control System ◽  
Base Temperature ◽  
Total Heat Transfer ◽  
Pin Fin

An experimental study was performed to provide information on the heat radiated to the space from grooved pin fin radiator of three different geometries. Since mass is at a premium on spacecraft, the space radiator used in its temperature control system needs to be optimized with respect to mass. A literature review shows that much of work on radiating fins has been carried out analytically and numerically. Presently, a radiating pin fin with threads and grooves on its outside surface is investigated experimentally. A test facility with a vacuum chamber and instrumentation is fabricated. The heat input to the fin is varied such that the base temperature is maintained constant under steady state. Based on a study of effect of vacuum, using available resources, the chamber is designed for a vacuum of 680 mm Hg such that the contribution of convection to the total heat transfer could be ignored. The study shows that there exists optimum thread per inch (TPI), angle of threads and depth of grooves for which the heat loss per unit mass is a maximum. The threaded and grooved radiating fin loses 1.2 to 1.34 times greater heat per unit mass, respectively, compared to the bare pin fin.

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