Calcultion of optimum inner flow velocity of sitereference high temperature gas sensor
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摘要:
为得到现场参考气流高温传感器的高准确设计结果，从支撑外壳温度、外屏温度、内屏温度、偶丝温度的模型与求解入手，通过关键参数预设与迭代，研究了传感器最佳内流速度计算方法，提出差商偏差判定法，解决了计算中边界条件不充分的问题。结果表明：在来流总温1717.5 K、来流静压0.5 MPa的条件下，双屏蔽L型现场参考气流高温传感器的最佳内屏内流速度和最佳环道内流速度分别为146.1、544.9 m/s。研究结果可为双屏蔽式、单屏蔽式等类型气流高温传感器的优化设计、理论分析等提供必要的支撑。
Abstract:In order to obtain high accuracy design result of site reference high temperature gas sensor, starting from the model and solution of temperatures of support housing, outer shield, inner shield and thermocouple wire, the computing method of optimum internal flow velocity of the sensor was studied through predetermination and iteration of key parameters. Difference quotient deviation judgment method was put forward, which solved the problem of insufficient boundary conditions during calculation. The result showed that optimum internal flow velocities of inner shield and annular channel of double shield L type site reference high temperature gas sensor were 146.1 m/s and 544.9 m/s, respectively, under the working condition of 1717.5 K total temperature and 0.5 MPa static pressure. The study results can provide necessary support for optimal design, theoretical analysis of high temperature gas sensors of double shield type, and single shield type, etc.
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图 1 现场参考气流高温传感器结构示意图
Figure 1. Structure diagram of site reference high gas temperature sensor
图 2 现场参考气流高温传感器结构设计流程图
Figure 2. Flow diagram of structure design of site reference high gas temperature sensor
图 3 现场参考气流高温传感器头部结构示意图
Figure 3. Diagram of head structure of site reference high gas temperature sensor
图 12 内屏后段温度初步求解结果
Figure 12. Preliminary solution result of back section temperature of inner shield
图 13 内屏后段温度最终求解结果
Figure 13. Fianl solution result of back section temperature of inner shield
图 14 内屏前段温度求解结果
Figure 14. Solution result of front section temperature of inner shield
图 16 偶丝温度初步求解结果
Figure 16. Preliminary solution result of thermocouple wire temperature
图 18 不同来流马赫数下内屏内流速度对测温偏差的影响
Figure 18. Influence of internal flow velocity of inner shield on temperature measurement deviation under different Mach numbers
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