基于CFX数值模拟的XBT内部传感器布置研究

XBT是可投弃式温深剖面测量仪的简称，用以测量海水不同深度的温度，为了研究XBT探头内部光纤传感器的合理布放位置，以尽可能减小温度与压力测量的误差，针对探头在水中的主要运动状态，运用CFX软件做瞬态温度响应模拟，包括阶跃温度响应和线性温度响应；然后对不同运动速度的XBT探头做稳态数值模拟，着重分析了其导流腔内水流速度与压力分布。模拟结果表明，线性响应引起的温度测量误差要小于阶跃响应，温度传感器宜放在导流腔中靠前的位置，同时导流腔后端存在水流静压为0的位置，适合压力传感器的布放。本文针对光纤XBT探头所做的流体仿真，为内部温度、压力传感器的布置提供了理论指导，对于同类传感器的设计也具有一定的参考价值。

英文摘要:

XBT is the abbreviated form of a name expendable bathy-thermograph, which can be used to measure the temperature of seawater at different depths. In order to study the optimal placement of the fiber optic sensors in XBT probe and minimize the error of measuring temperature and pressure, we use CFX software simulate the transient temperature response, including step temperature response and linear temperature response. Considering the main movement of probe in water, we make the steady-state numerical simulation about XBT probe at different velocity, emphatically analyze the distribution of water velocity and pressure in diversion cavity. The simulation results show that the thermometric error caused by the linear response is less than the step response, the temperature sensor should be placed forward in the diversion cavity, and there is a position where the static pressure is 0 at the end of diversion chamber, which is suitable for the placement of the pressure sensor. The fluid simulation in this paper provides some reference for the layout of fiber optical temperature and pressure sensors in fiber XBT probe, and there is some reference value for the design of similar sensors.

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