Temperature measurement at turbine outlet achieved by a sensing net and infrared thermometry method

Abstract

The measurement of turbine outlet temperature is challenging because of an intense swirl and high speed at this position. However, accurate measurement of the turbine outlet temperature is fundamental for characterizing the turbine performance. The paper proposed an infrared thermometry method based on the temperature sensing net (TSN) to measure the temperature distribution at the turbine outlet. First, this article describes the design and operation of the measurement procedure through infrared technology to accomplish this difficult task. Then, the temperature and velocity distribution at the turbine outlet and the adiabatic efficiency of the turbine are obtained using the CFD (Computational Fluid Dynamics) method to verify the feasibility of the proposed scheme. And the CHT (Conjugate Heat Transfer) simulation results for the TSN show that the incoming flow mass rate has a great influence on TSN temperature. In contrast, the influence of the incoming flow temperature gradient on it is almost negligible. Moreover, the fluid flow behavior and static temperature distribution around the temperature-sensing wire (TSW) at different Mach numbers are analyzed, and the heat transfer mechanism between the TSW and the fluid is revealed. The results show that the temperature of the TSN is lower than that of the incoming flow, but the distribution law is similar. The main factor affecting the temperature difference between the TSW and the fluid is the incoming flow velocity.