Hilbert-Huang Transform Analysis of Dynamic Differential Pressure Signal of Gas-Liquid Two-Phase Flow

2008 ◽  
Author(s):  
Bin Sun ◽  
Yongjun Zheng
Keyword(s):  
Two Phase Flow ◽  
Differential Pressure ◽  
Phase Flow ◽  
Two Phase ◽  
Hilbert Huang Transform ◽  
Pressure Signal

Characteristic Variables Extracting of the Gas-Liquid Two-Phase Flow through V-Cone Flowmeter Based on Adaptive Optimal-Kernel Theory

2012 ◽  
Vol 516-517 ◽  
pp. 1082-1085
Author(s):  
Shuai Zhang ◽  
Bin Sun ◽  
Er Peng Wang
Keyword(s):  
Frequency Spectrum ◽  
Two Phase Flow ◽  
Differential Pressure ◽  
Phase Flow ◽  
Two Phase ◽  
Time Frequency ◽  
Pressure Signal ◽  
Flow Information ◽  
Flow Through ◽  
Optimal Kernel

In order to study the mechanism of gas-liquid two-phase flow, a method of characteristic variables extracting based on Adaptive Optimal-Kernel (AOK) theory was represented in the paper. First, to collect dynamic differential pressure signal of gas-liquid two-phase flow through a horizontal V-cone flow meter, and then the AOK theory was used to analyze the dynamic differential pressure signal. The movement law of two-phase flow was discussed through the time-frequency spectrum. Finally, four characteristic variables were defined by using the time-frequency spectrum and the ridge of AOK. After the characteristic variables were visual analyzed, the relationship between the different combination of characteristic variables and the flow pattern was obtained. The results show that, characteristic variables defined by this method can get a clear description of the flow information. This method provides a new way for the flow patterns identification.

Gas-Liquid Two-Phase Flow Detection Techniques Based on Internal and External Tube Differential Pressure Flowmeter

2014 ◽  
Vol 568-570 ◽  
pp. 363-369
Author(s):  
Li Li Pang ◽  
Han Chuan Dong ◽  
Yun Shi ◽  
Li De Fang
Keyword(s):  
Cfd Simulation ◽  
Two Phase Flow ◽  
Theoretical Models ◽  
Differential Pressure ◽  
Phase Flow ◽  
Two Phase ◽  
Modified Model ◽  
Detection Techniques ◽  
External Tube ◽  
Flow Detection

The gas-liquid two-phase flow exists widely in nature and in our daily life, to realize the phase flow does not separate online measurement has become an important subject in the study. Through CFD simulation experiment, the optimal structure of inner and outer tube differential pressure flowmeter prototype. Through the analysis of the experimental data, comparison of the classical theoretical models found high Chishlom prediction model error is minimum. Moisture the modified model, the relative error of measurement is better than in the range of experiment 5%.

Transient Response of BWR Core Flow During Simulated Generator Load Rejection Event

2009 ◽  
Author(s):  
Masahiro Furuya ◽  
Takashi Hara ◽  
Shinya Mizokami
Keyword(s):  
Mass Flux ◽  
Two Phase Flow ◽  
Differential Pressure ◽  
Phase Flow ◽  
Two Phase ◽  
Core Flow ◽  
Initial Stage ◽  
Rapid Flow ◽  
Fine Control ◽  
Automatic Controllers

Integral Effects Test (IET) was conducted to investigate the effects of flow redistribution during the generator load rejection event by using the SIRIUS-F facility, which simulates boiling two-phase flow in a BWR core. Owing to the automatic controllers of a recirculation pump inverter and fine-control valves in the facility, the time series of signals of heat flux and mass flux were observed to agree well with those of target rapid flow-decrease events in the previous experimental series. This paper addresses the simulated generator load rejection event, during which the flow and power gradually decrease and the flow takes a turn toward recovery. As a result of the two-parallel channel experiment, mass flux of a hot channel is lower than that of the other during the initial stage. When the void fraction becomes smaller, mass flux of the hot channel is observed to become higher. This phenomenon can be accurately demonstrated with the TRAC-BF1 code as well. The code does, therefore, predict the boiling two-phase flow in a BWR core even at such flow-decrease event. During the event, differential pressure along each channel between the upper and lower plena decreases by several tens of kPa. The relative perturbations of the differential pressure between both channels, however, remain less than 0.4%, which is a significantly small amount. In conclusion, the differential pressures between the upper and lower plena of two-parallel channels are, therefore, identical to each other regardless of the power.

Sign in / Sign up

Export Citation Format

Share Document