基于超声波渡越时间的非稳态温度场数值计算与实验研究

Calculation and experimental research of unsteady temperature field based on ultrasonic transit time

为求解金属材料在瞬态热流作用下温度场随时间变化规律,基于超声波渡越时差法,利用超声波在材料中传播声速与其弹性模量变化关系,结合非稳态传热过程的数值计算,提出了重建非稳态温度场的数值计算方法。结合瞬态热流作用下的镍基合金温度及超声回波测量实验,实现了非稳态导热中的温度场变化的计算,为金属材料的非接触式测温提供了有效途径。

In order to solve the change of temperature field with time of metal materials in the process of transient heat flow, this paper designs a measurement and calculation method for unsteady temperature field based on ultrasonic transit time, which uses the relationship between ultrasonic propagation speed and its elastic modulus change in materials and, combined with the numerical calculation of unsteady heat transfer process, finally reconstructs a numerical calculation method for unsteady temperature field. On the basis of the nickel-based alloy temperature and ultrasonic echo measurement experiment with the transient heat flow, the temperature field change under an unsteady heat conduction is calculated, which provides an effective way for non-contact temperature measurement of metal materials.