Nonlinear characteristics analysis of sodium flow measurement based on the principle of turbulent fluctuation
| Autor: | Wen-Kai Wu, Yan Xiaoxue, Ke-Jun Xu, Ya Huang, Xin-Long Yu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Nuclear and High Energy Physics
Materials science Turbulence 020209 energy Mechanical Engineering 02 engineering and technology Mechanics 01 natural sciences Flow measurement 010305 fluids & plasmas Magnetic field Degree (temperature) Volumetric flow rate Physics::Fluid Dynamics Nonlinear system Nuclear Energy and Engineering Flow (mathematics) Distortion 0103 physical sciences 0202 electrical engineering electronic engineering information engineering General Materials Science Safety Risk Reliability and Quality Waste Management and Disposal |
| Zdroj: | Nuclear Engineering and Design. 368:110834 |
| ISSN: | 0029-5493 |
| DOI: | 10.1016/j.nucengdes.2020.110834 |
| Popis: | The permanent magnet sodium flowmeter (PMSF) used to measure the coolant flow in fast reactors has to be calibrated in situ due to operating conditions and measurement requirements. When the large-diameter PMSF is calibrated in situ based on the cross-correlation method, there is no bluff body in the flow tube, the sodium flow measurement relied only on the turbulent fluctuation of the sodium flow, so the relationship between the cross-correlation flow rate and the standard flow rate has nonlinearity. The reasons for the nonlinear characteristics are analyzed from a mechanism perspective. The sodium flow measurement experiments based on the cross-correlation method are performed for DN150 PMSF without bluff body at a temperatures of 250 °C, and also conducted for DN300 PMSF without bluff body at the temperatures of 250 °C, 360 °C and 400 °C, respectively. The experimental data of electrodes at different positions and distances are processed by the biased cross-correlation function estimation, the maximum nonlinearity error between the standard flow rate and the cross-correlation flow rate is found to be up to 90%, and the quadratic function model is established to describe their relationship. The flow rate distribution between adjacent electrodes and the degree of nonlinearity between different electrode pairs are investigated, proving that the larger the flow rate, the more serious the distortion of the primary magnetic field, and the distortion of the primary magnetic field at different electrode positions is different. The influence of pipe diameter on the degree of nonlinearity is analyzed, the larger the diameter, the greater the degree of nonlinearity. The effect of the temperature of liquid sodium on the degree of nonlinearity is studied, the higher the temperature, the smaller the degree of nonlinearity. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect