管状电加热器升温特性的数值计算

在非结构化网格中,采用基元有限容积方法和全隐时间格式,数值模拟了一种管状电加热元件的热力特性。通过分析非稳态温度场的变化,研究了电绝缘材料不同填充率过程中的升温特性。从计算结果中得出绝缘材料压紧度增大时,其导热系数非线性地增大,使得电加热器温升特性非线性变化。这些结果同时与结构化网格中的结果进行比较,证明了结论的正确性和可靠性。

Numerical calculation for thermal characters of a tubular electrical heater

The cell-based finite volume method （FVM） was used in unstructured grids to simulate a kind of tubular electrical heating equipment. By analyzing and calculating the change of unsteady-state temperature distributions, the thermal characters in the course of packing electrical insulation materials were studied. Results show that the conductivity is augmented and the temperature is increased quickly when the insulation materials are compressed strongly. The agreement between results of the presented method and those from structured meshes verifies the reasonability of the solutions.