Investigation on measurement method for hydrodynamic noise in centrifugal pumps using reverberation tanks

2019 ◽  
Vol 146 (4) ◽  
pp. 3018-3019
Author(s):  
Yiming Zhang ◽  
Qi Li ◽  
Rui Tang ◽  
dajing shang
Keyword(s):  
Measurement Method ◽  
Centrifugal Pumps ◽  
Hydrodynamic Noise

The action mechanism of rotor–stator interaction on the hydraulic and hydroacoustic characteristics of the guide vane in a jet centrifugal pump

2020 ◽  
Vol 34 (34) ◽  
pp. 2050396
Author(s):  
Rong Guo ◽  
Rennian Li ◽  
Renhui Zhang ◽  
Wei Han
Keyword(s):  
Flow Field ◽  
Transient Flow ◽  
Guide Vane ◽  
Centrifugal Pumps ◽  
Action Mechanism ◽  
Exterior Field ◽  
Outlet Angle ◽  
Rotor Stator Interaction ◽  
Wrap Angle ◽  
Hydrodynamic Noise

The aim of this study was to investigate the action mechanism of the rotor–stator interaction (RSI) in the transient flow field and hydrodynamic noise field of the guide vane in jet centrifugal pumps (JCPs). The numerical method of CFD (computational fluid dynamics), coupled with CFA (computational fluid acoustics), was used to analyze the correlation between the impeller parameters and the flow/sound characteristics of the guide vane. The results show that on the inlet surface of the guide vane, an impeller with fewer blades, a smaller wrap angle, a smaller outlet angle and a smaller outlet diameter is beneficial for reducing the pressure fluctuation intensity. When the guide vane geometry is constant, the evolution processes of the transient flow field inside the static and dynamic cascades are mainly related to the blade number and speed of the impeller. An impeller with more blades, a larger wrap angle, a smaller outlet angle and a smaller outlet diameter is beneficial for improving the flow field distribution in the dynamic and static cascades. The hydrodynamic noise in the interior field is mainly related to the fluctuation characteristics of the transient flow field, but that in the exterior field is related not only to the fluctuation characteristics of the transient flow field, but also to the structural properties of the JCP pump body. The hydrodynamic noise in the exterior field presents an obvious dipole symmetrical distribution on the meridional plane, and the minimum value appears in the direction of the rotation axis because of the symmetrical structural characteristics of the pump body. The modal-shaped features of the JCP lead to a sidelobe phenomenon on the sagittal plane.

Short-term hemodynamic support with bearingless, magnetically levitated paracorporal centrifugal pumps

2009 ◽  
Vol 56 (S 01) ◽  
Author(s):  
JFM Bechtel ◽  
EI Charitos ◽  
T Hanke ◽  
M Misfeld ◽  
C Schmidtke ◽  
...  
Keyword(s):  
Centrifugal Pumps ◽  
Short Term ◽  
Hemodynamic Support ◽  
Magnetically Levitated

Analysis of significant measures for thermal conductivity

2020 ◽  
pp. 35-42
Author(s):  
Yuri P. Zarichnyak ◽  
Vyacheslav P. Khodunkov
Keyword(s):  
Thermal Conductivity ◽  
Heat Flux ◽  
Surface Heat Flux ◽  
Heat Flux Density ◽  
Measurement Method ◽  
Conductivity Measurement ◽  
Surface Heat ◽  
Measuring Instrument ◽  
New Class ◽  
Achievable Accuracy

The analysis of a new class of measuring instrument for heat quantities based on the use of multi-valued measures of heat conductivity of solids. For example, measuring thermal conductivity of solids shown the fallacy of the proposed approach and the illegality of the use of the principle of ambiguity to intensive thermal quantities. As a proof of the error of the approach, the relations for the thermal conductivities of the component elements of a heat pump that implements a multi-valued measure of thermal conductivity are given, and the limiting cases are considered. In two ways, it is established that the thermal conductivity of the specified measure does not depend on the value of the supplied heat flow. It is shown that the declared accuracy of the thermal conductivity measurement method does not correspond to the actual achievable accuracy values and the standard for the unit of surface heat flux density GET 172-2016. The estimation of the currently achievable accuracy of measuring the thermal conductivity of solids is given. The directions of further research and possible solutions to the problem are given.

Jet flow and hydrodynamic noise of the open mechanical bileaflet heart valve

2018 ◽  
Vol 1(91) (1) ◽  
pp. 7-32
Author(s):  
V.A. Voskoboinick ◽  
◽  
A.A. Voskoboinick ◽  
A.V. Voskoboinick ◽  
F. Lucherini ◽  
...  
Keyword(s):  
Heart Valve ◽  
Jet Flow ◽  
Hydrodynamic Noise

Acoustic Distance Measurement Method Using 2ch Microphones Measurable from 0m Based on Phase Interference and Removal of DC Component

2015 ◽  
Vol 135 (11) ◽  
pp. 1349-1350
Author(s):  
Kazuhiro Suzuki ◽  
Noboru Nakasako ◽  
Masato Nakayama ◽  
Toshihiro Shinohara ◽  
Tetsuji Uebo
Keyword(s):  
Measurement Method ◽  
Distance Measurement ◽  
Phase Interference ◽  
Dc Component
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