CAJ | 학술논문

采用有限元法,利用ANSYS-FLOTRAN CFD软件,计算了在不同倾斜状态下三丝结构敏感元件内的温度场和流场.计算结果表明,加热热电阻丝在敏感元件内形成一定的温度场和流场,倾斜时温度场和流场不再对称分布;在水平状态时两检测热电阻丝处的气流速度相等,两检测热电阻丝的电阻相等,电桥电路输出为零;在倾斜状态下时,两检测热电阻丝处的气流速度之差随着倾斜角度而变化,引起两检测热电阻丝电阻之差也随之变化,电桥输出一个对应于倾斜角度的电压.有限元计算法为三丝结构气流式水平姿态传感器优化设计开辟了有效的研究途径.
채용유한원법,이용ANSYS-FLOTRAN CFD연건,계산료재불동경사상태하삼사결구민감원건내적온도장화류장.계산결과표명,가열열전조사재민감원건내형성일정적온도장화류장,경사시온도장화류장불재대칭분포;재수평상태시량검측열전조사처적기류속도상등,량검측열전조사적전조상등,전교전로수출위령;재경사상태하시,량검측열전조사처적기류속도지차수착경사각도이변화,인기량검측열전조사전조지차야수지변화,전교수출일개대응우경사각도적전압.유한원계산법위삼사결구기류식수평자태전감기우화설계개벽료유효적연구도경.
The temperature and flow fields of the sensing device with three-thread structure in different tilting states was calculated by using the ANSYS-FLOTRAN CFD program and with the method of finite element. The results showed that a heated hot wire formed a definite temperature-field and fluid-field within the sensing element when it was gradient, and the two fields were no longer distributing symmetrically. In the level state, the velocity of gas flow at both detected hot wires was equal, so the resistance of both detection hot wires were also equal and the output of the Bridge circuit was zero; while in the incline state, the velocity difference of gas flow at both hot wires will change with the tilt angle, so result in changing of the resistance difference of both hot wires, the Bridge outputs a voltage signal of corresponding to the tilt angle. This calculated method provided an effective way for the optimization design of gas-flow level-gesture sensor with three-thread structure.