Abstract Using cold air to cool down infrastructures in permafrost regions is a common technique, but the horizontal ventiduct method has defects. This paper presents the elbow-shaped ventiduct and focuses on its designing parameters, considering the regional climate along the Qinghai-Tibet Engineering Corridor. Based on the natural convection principle, a program for calculating the parameters of the elbow ventiduct of embankment is compiled. By using this program and according to the climatic conditions, the required freezing radius of elbow ventiduct is calculated, and the specific thermal parameters of elbow ventiduct in different climatic regions are calculated. Results show that the lower the average temperature is, the smaller the required freezing radius is. The required freezing radius at Anduo, Kaixinling, Liangdaogou, and the Buqu Valley are 2.45 m, 1.7 m, 1.13 m, and 0.54 m, respectively, and the corresponding longest horizontal pipes that can be used are 32 m, 101 m, 228 m and 799 m, respectively. The regions where the elbow-shaped ventiduct are not suitable or not necessary are figured out. Results also show that the bigger the pipe diameter, the longer the maximum allowable length of horizontal pipe; the higher the vertical pipe length, the longer maximum allowable length of horizontal pipe.

中文翻译：

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青藏工程走廊多年冻土区弯管路堤几何参数研究

摘要 利用冷空气对多年冻土地区的基础设施进行降温是一种常用技术，但水平通风管道方法存在缺陷。考虑到青藏工程走廊沿线的区域气候，本文介绍了肘形通风管并重点介绍了其设计参数。基于自然对流原理，编制了路堤弯管风管参数计算程序。利用该程序，根据气候条件，计算出弯管风管所需的冻结半径，计算出弯管风管在不同气候区的具体热力参数。结果表明，平均温度越低，所需的冻结半径越小。安多、开新岭、两道沟所需的冰冻半径，布曲河谷和布曲河谷分别为2.45 m、1.7 m、1.13 m和0.54 m，对应的最长可用水平管分别为32 m、101 m、228 m和799 m。找出不适合或不需要肘形通风管的区域。结果还表明，管径越大，水平管的最大允许长度越长；竖管长度越高，横管最大允许长度越长。水平管的最大允许长度越长；竖管长度越高，横管最大允许长度越长。水平管的最大允许长度越长；竖管长度越高，横管最大允许长度越长。