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为降低热应力造成多层结构浸入式水口开裂的可能性,采用有限单元法研究了内面层厚度和材料物理性能参数对其热应力的影响,以及内面层厚度和导热系数对其内壁温度的影响。结果表明,当内面层厚度由0 mm增至10 mm时,浸入式水口所受最大拉应力先升后降;当其厚度在2~4 mm之间时,拉应力较小。随着内面层弹性模量、热膨胀系数和导热系数的降低,最大拉应力减小。增加外面层厚度,减小其导热系数,预热后浸入式水口内壁温度的降低幅度减小。
In order to reduce the possibility of cracking caused by thermal stress in submerged entry nozzle, finite element method was used to study the effect of inner layer thickness and material physical parameters on thermal stress, and the effects of inner layer thickness and thermal conductivity on inner wall temperature Impact. The results show that when the thickness of the inner layer increases from 0 mm to 10 mm, the maximum tensile stress on the immersion nozzle first increases and then decreases; when the thickness is between 2 and 4 mm, the tensile stress is small. With the reduction of the elastic modulus, thermal expansion coefficient and thermal conductivity of the inner layer, the maximum tensile stress decreases. Increase the thickness of the outer layer, reducing its thermal conductivity, preheating immersion nozzle wall temperature decreases.