scholarly journals Data-Driven Methods for Spectator Symmetry Plane Estimation in CBM Experiment at FAIR

Particles ◽  
2021 ◽  
Vol 4 (3) ◽  
pp. 354-360
Author(s):  
Oleg Golosov ◽  
Ilya Selyuzhenkov ◽  
Evgeny Kashirin
Keyword(s):  
Heavy Ions ◽  
Flow Analysis ◽  
Symmetry Plane ◽  
Beam Momentum ◽  
Data Driven ◽  
Baryonic Matter ◽  
Flow Measurements ◽  
Qcd Phase Diagram ◽  
Plane Transverse ◽  
The Spectator

The Compressed Baryonic Matter experiment (CBM) at FAIR aims to study the area of the QCD phase diagram at high net baryon densities and moderate temperatures with collisions of heavy ions at sNN=2.8–4.9 GeV. The anisotropic transverse flow is one of the most important observable phenomena in a study of the properties of matter created in such collisions. Flow measurements require the knowledge of the collision symmetry plane, which can be determined from the deflection of the collision spectators in the plane transverse to the direction of the moving ions. The CBM performance for projectile spectator symmetry plane estimation is studied with GEANT4 Monte Carlo simulations using collisions of gold ions with beam momentum of 12A GeV/c generated with the DCM-QGSM-SMM model. Different data-driven methods to extract the correction factor in flow analysis for the resolution of the spectator symmetry plane estimated with the CBM Projectile Spectator Detector are investigated.

Aerodynamics of a Transonic Centrifugal Compressor Impeller

2002 ◽  
Author(s):  
Seiichi Ibaraki ◽  
Tetsuya Matsuo ◽  
Hiroshi Kuma ◽  
Kunio Sumida ◽  
Toru Suita
Keyword(s):  
Shock Wave ◽  
High Pressure ◽  
Centrifugal Compressor ◽  
High Efficiency ◽  
Pressure Ratio ◽  
Flow Analysis ◽  
Flow Distortion ◽  
Flow Measurements ◽  
High Pressure Ratio ◽  
Compressor Impeller

High pressure ratio centrifugal compressors are applied to turbochargers and turboshaft engines because of their small dimensions, high efficiency and wide operating range. Such a high pressure ratio centrifugal compressor has a transonic inlet condition accompanied with a shock wave in the inducer portion. It is generally said that extra losses are generated by interaction of the shock wave and the boundary layers on the blade surface. To improve the performance of high pressure ratio centrifugal compressor it is necessary to understand the flow phenomena. Although some research works on transonic impeller flow have been published, some unknown flow physics are still remaining. The authors designed a transonic impeller, with an inlet Mach number is about 1.3, and conducted detailed flow measurements by using Laser Doppler Velocimetry (LDV). In the result the interaction between the shock wave and tip leakage vortex at the inducer and flow distortion at the downstream of inducer were observed. The interaction of the boundary layer and the shock wave was not observed. Also computational flow analysis were conducted and compared with experimental results.

scholarly journals Flow Measurements and Flow Analysis in the Exit Region of a Radial Turbine

1997 ◽  
Vol 3 (2) ◽  
pp. 93-105 ◽  
Author(s):  
D. M. Murugan ◽  
W. Tabakoff ◽  
A. Hamed
Keyword(s):  
Flow Analysis ◽  
Three Dimensional ◽  
Meridional Flow ◽  
Tip Clearance ◽  
Meridional Plane ◽  
Complex Flow ◽  
Flow Measurements ◽  
Tip Clearance Flow ◽  
Exit Region ◽  
Radial Turbine

Three-dimensional flow measurements using LDV system were obtained in the exit region of a radial inflow turbine at an off-design operating condition. The measurements reveal a complex flow pattern near the tip region at the rotor exit due to the interaction of the tip clearance flow. The effect of the rotor on the exit flow field is observed in the proximity of the rotor exit. Steady axisymmetric, compressible, turbulent flow computations with a two equation turbulence model were performed using the PARC code for the meridional flow in the radial turbine exit region. The computational results obtained in the meridional plane are compared with the experimental results, which are correlated to the rotor blade rotation in the exit region of the radial turbine.A version of this paper was presented at the 30th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, Indianapolis, Indiana, Paper no. AIAA-94-3075.

scholarly journals Robust Data-Driven Leak Localization in Water Distribution Networks Using Pressure Measurements and Topological Information

Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7551
Author(s):  
Débora Alves ◽  
Joaquim Blesa ◽  
Eric Duviella ◽  
Lala Rajaoarisoa
Keyword(s):  
Water Distribution ◽  
Pressure Sensors ◽  
Distribution Networks ◽  
Water Distribution Networks ◽  
Data Driven ◽  
Pressure Measurements ◽  
Leak Pressure ◽  
Flow Measurements ◽  
Topological Information ◽  
Probable Path

This article presents a new data-driven method for locating leaks in water distribution networks (WDNs). It is triggered after a leak has been detected in the WDN. The proposed approach is based on the use of inlet pressure and flow measurements, other pressure measurements available at some selected inner nodes of the WDN, and the topological information of the network. A reduced-order model structure is used to calculate non-leak pressure estimations at sensed inner nodes. Residuals are generated using the comparison between these estimations and leak pressure measurements. In a leak scenario, it is possible to determine the relative incidence of a leak in a node by using the network topology and what it means to correlate the probable leaking nodes with the available residual information. Topological information and residual information can be integrated into a likelihood index used to determine the most probable leak node in the WDN at a given instant k or, through applying the Bayes’ rule, in a time horizon. The likelihood index is based on a new incidence factor that considers the most probable path of water from reservoirs to pressure sensors and potential leak nodes. In addition, a pressure sensor validation method based on pressure residuals that allows the detection of sensor faults is proposed.

scholarly journals Crustal heat flow measurements in western Anatolia from borehole equilibrium temperatures

2014 ◽  
Vol 6 (1) ◽  
pp. 403-426 ◽  
Author(s):  
K. Erkan
Keyword(s):  
Heat Flow ◽  
Flow Analysis ◽  
Aegean Sea ◽  
High Heat ◽  
Quality Data ◽  
Western Anatolia ◽  
High Heat Flow ◽  
Flow Measurements ◽  
Water Wells ◽  
Direct Measurements

Abstract. Results of a crustal heat flow analysis in western Anatolia based on borehole equilibrium temperatures and rock thermal conductivity data are reported. The dataset comprises 113 borehole sites that were collected in Southern Marmara and Aegean regions of Turkey in 1995–1999. The measurements are from abandoned water wells with depths of 100–150 m. Data were first classed in terms of quality, and the low quality data, including data showing effects of hydrologic disturbances on temperatures, were eliminated. For the remaining 34 sites, one meter resolution temperature-depth curves were carefully analyzed for determination of the background geothermal gradients, and any effects of terrain topography and intra-borehole fluid flow were corrected when necessary. Thermal conductivities were determined either by direct measurements on representative surface outcrop or estimated from the borehole lithologic records. The calculated heat flow values are 85–90 mW m−2 in the northern and central parts of the Menderes horst-graben system. Within the system, the highest heat flow values (> 100 mW m−2) are observed in the northeastern part of Gediz Graben, near Kula active volcanic center. The calculated heat flow values are also in agreement with the results of studies on the maximum depth of seismicity in the region. In the Menderes horst-graben system, surface heat flow is expected to show significant variations as a result of active sedimentation and thermal refraction in grabens, and active erosion on horst detachment zones. High heat flow values (90–100 mW m−2) are also observed in the peninsular (western) part of Çanakkale province. The heat flow anomaly here may be an extension of the high heat flow zone previously observed in the northern Aegean Sea. Moderate heat flow values (60–70 mW m−2) are observed in eastern part of Çanakkale and central part of Balıkesir provinces.

scholarly journals Performances and Flow Analysis in the Centrifugal Vortex Pump

2013 ◽  
Vol 135 (1) ◽  
Author(s):  
Tihomir Mihalić ◽  
Zvonimir Guzović ◽  
Andrej Predin
Keyword(s):  
Numerical Simulations ◽  
Centrifugal Pump ◽  
Fluid Dynamic ◽  
Flow Analysis ◽  
Physical Models ◽  
Back Side ◽  
Additional Energy ◽  
Flow Measurements ◽  
Vortex Pump ◽  
Fluid Particles

Improvements to the characteristics of a centrifugal pump through the addition of a vortex rotor were investigated both experimentally and with computational fluid dynamic (CFD) analysis. The idea behind that improvement is in creating so-called coherent structures of eddies and turbulence in the peripheral area of the vortex rotor mounted at the back side of centrifugal rotor. Research on the energy transformations in the centrifugal vortex pump in this work was carried out using numerical simulations of the flow in the centrifugal and the centrifugal vortex pump. Measurements of relevant parameters that describe the performance of pumps, at their physical models, were gained from experiments. The measurement results were used as experimental validation of numerical simulations. In contrast, flow visualization derived from the numerical simulation was used to interpret measurements. In deriving the experimental procedure, special care was taken with the flow measurements. The reason for this is in the fact that the flow measurements had the biggest influence on the overall measurement uncertainty. However, flow measurements were the most demanding with regards to the experiment design and in taking the measurement readings. This experimental-CFD research made it possible to undertake an assessment of vortex rotor contribution on the head of the centrifugal vortex pump. The influence of the vortex rotor on the efficiency of the centrifugal vortex pump was investigated by comparing it with the efficiency of the centrifugal pump with the same geometry. An analysis of the flow structure was conducted in order to better understand the energy transformations that are the result of the interaction between the flow from the channels of the centrifugal part of the centrifugal vortex rotor and vortices formed at the vortex part of the centrifugal vortex rotor as well as their interactions with the stator. It was shown that this additional energy significantly increases pump head while increasing pump stability. This synergetic work has demonstrated that while vortex rotor gives additional energy to the fluid particles, that did not enter stator due to the energy lack by changing their momentum; at the same time, some of the kinetic energy contained in the vortex rotor induced vortices is also added to those fluid particles.

Flow Analysis for a Flow Channel Instrument to Evaluate Viscosities of Non-Newtonian Viscoelastic Liquid Foods

2017 ◽  
Vol 13 (9) ◽  
Author(s):  
Masanori Yoshida ◽  
Hitoshi Igarashi ◽  
Kento Iwasaki ◽  
Sayaka Fuse ◽  
Yuko Tsuruta ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Viscous Flow ◽  
Flow Analysis ◽  
Relative Magnitude ◽  
Flow Channel ◽  
Viscoelastic Liquid ◽  
Flow Measurements ◽  
Flow Processes ◽  
Liquid Foods

AbstractTo develop a structurally simple and easy-to-use viscometer for liquid foods, flow measurements and analyses were done in a flow channel instrument. Newtonian and non-Newtonian test liquids respectively employed in the experiments show viscosity and viscoelasticity. Changes of the modified friction coefficient during the flow processes characterized viscous flow in the instrument. The elasticity was found to be dominant in the early process, reducing the flow as a function of the relative magnitude of liquid viscoelasticity.

Anisotropic Flow Measurements from the NA61/SHINE and NA49 Beam Momentum Scan Programs at CERN SPS

2020 ◽  
Vol 51 (3) ◽  
pp. 301-304 ◽  
Author(s):  
E. Kashirin ◽  
◽  
I. Selyuzhenkov ◽  
O. Golosov ◽  
V. Klochkov
Keyword(s):  
Beam Momentum ◽  
Flow Measurements ◽  
Anisotropic Flow
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