矩形翅片热管冻结土壤的热-力耦合模拟研究  

Thermal-Mechanical Coupling Simulation of Freezing Soil by Rectangular Fin Gravity Heat Pipe

作　　者：陈艳旭 陶汉中 CHEN Yan-xu;TAO Han-zhong(School of energy science and engineering,Nanjing Tech University)

机构地区：[1]南京工业大学能源科学与工程学院

出　　处：《建筑热能通风空调》2020年第4期20-25,共6页Building Energy & Environment

摘　　要：采用数值模拟的方法,研究了氨-钢矩形翅片重力热管冻结土壤的情况,并与传统氨-钢重力热管进行比较。从温度场和应力场进行了分析。以南京地区的春天作为土壤冻结的背景,即土壤的初始温度为286.32 K,气温为285.65 K。土壤采用粉质黏土,冻结深度为20.2 m。热管当量导热系数控制在4×10^5~9×10^5W/(m·K)。模拟结果显示,矩形翅片热管冻结土壤的效率高于传统热管。在冻结土壤过程中,矩形翅片热管所受的最大应力仅为传统热管0.98倍。且工况范围内,翅片发生的最大形变为0.23 mm。The numerical simulation method is used to study the technology of artificial frozen soil by conventional heat pipe and rectangular fin heat pipe from temperature field and stress field in this paper. The silty clay is selected as the soil material and the freezing depth is 20.2 m. The soil and air temperature in spring in Nanjing area are selected as the boundary conditions. The equivalent thermal conductivity of the heat pipe is controlled from 4×10^5 W/(m·K) to 9×10^5 W/(m·K). Simulation results show that efficiency of rectangular fin heat pipe to freeze soil is higher than that of conventional heat pipe. In the process of freezing soil, the maximum stress of the rectangular fin heat pipe is only 0.98 times that of the conventional heat pipe. In addition, the maximum deformation of the fin is 0.23 mm within the operating range.

关 键 词：热管 矩形翅片 土壤冻结 数值模拟 形变 

分 类 号：TU83[建筑科学—供热、供燃气、通风及空调工程]