Abstract

This paper describes an evaluation method for the liquid separation structure that is utilized in thermal probe for measuring gas temperature in gas-droplet two-phase flows. The study is performed on two structures. Numerical simulations are conducted to find the proper position of the thermocouple detector in the structures. Based on that, a visualization device equipped with high-sensitivity thermocouples is designed according to the separation structures, and a fundamental experiment is then performed to study the influence of droplets on the temperature measurement of the thermocouple. The inflow velocity ranges from 60 to 115 m/s, and the inflow temperature range are 40 to 56 °C. The droplet deposition on the thermocouple detector in the structures is observed with a well-designed optical system, and the temperature response of the thermocouple is monitored simultaneously, and accordingly the relation between droplet deposition effect and the response of the thermocouple is built. Finally, the experiments of temperature measurements with two probe devices that designed based on both separation structures in an evaporating two-phase flow are carried out. Based on the temperature measurement results, the structure with a rectangular blunt body shows good performance, but the one with an elliptical blunt body does not.

摘要

本文介绍了一种用于测量气滴两相流中气体温度的热探头中的液体分离结构的评估方法。该研究是在两个结构上进行的。进行数值模拟以找到热电偶检测器在结构中的适当位置。在此基础上，根据分离结构设计了配备高灵敏度热电偶的可视化装置，并进行了基础实验，研究了液滴对热电偶测温的影响。流入速度范围为 60 至 115 m/s，流入温度范围为 40 至 56 °C。使用精心设计的光学系统观察结构中热电偶检测器上的液滴沉积，同时监测热电偶的温度响应，从而建立液滴沉积效应与热电偶响应的关系。最后，在蒸发两相流中进行了基于两种分离结构设计的两种探针装置的温度测量实验。根据温度测量结果，矩形钝体结构表现出良好的性能，而椭圆钝体结构则不然。