| 论文简介 |
Abstract— To reduce the effect of medium’s conductivity on
electrical capacitance sensor, and to realize accurate measurement
of sectional water fraction for gas-water two-phase flow containing
conductive liquid phase, a sectional liquid fraction measurement
technology based on capacitance sensor is proposed in this work.
Firstly, the properties of two commonly-used structures of
capacitance sensor are compared to determine an optimal
structure, from perspective of sensitivity area. Then, the
optimization for the sensor’s geometrical parameters is discussed
through finite element method. Whereafter, mechanism of why
medium’s conductivity is analyzed combining electromagnetism
and circuit theories. The theoretical analysis indicates that the
applied exciting frequency is a key factor influencing the
conductivity effect on capacitance measurement, and an exciting
frequency optimization rule is proposed accordingly. Dynamic
experiment is carried out on a gas-water two-phase flow test
platform to validate the effectiveness of the proposed method. The
experiment result proves the feasibility of the theoretical analysis
and the proposed method. This work is constructive to the
capacitance-based measurement designs applied to the objects
containing conductive medium, and also offers a guide of structure
selection and optimization for capacitance sensors.
Index Terms— Capacitance sensor, Water fraction
measurement, Conductive phase, Gas-liquid two-phase flow. |
(创新港)
