• CN：11-2187/TH
• ISSN：0577-6686

• 材料科学与工程 •

### 高压容器泄漏中发生的焦耳-汤姆逊效应研究

1. 清华大学航天航空学院 北京 100084
• 出版日期:2016-02-15 发布日期:2016-02-15
• 作者简介:艾刚,男,1979年出生,博士。主要从事焦耳-汤姆逊效应对压力容器破前漏准则影响的研究。E-mail：aigang2000@gmail.com ;刘应华(通信作者),男,1968年出生,博士,教授,博士研究生导师。主要从事塑性力学和计算固体力学的研究。E-mail：yhliu@tsinghua.edu.cn
• 基金资助:
国家杰出青年科学基金资助项目(11325211)

### Study on the Joule-Thomson Effect during Leakage in High Pressure Vessels

AI Gang, LIU Yinghua

1. School of Aerospace Engineering, Tsinghua University, Beijing 100084
• Online:2016-02-15 Published:2016-02-15

Abstract: Due to its economic profits, the marine transportation of compressed natural gas is about to enter the commercial stage. The highly pressurized containers (up to 25 MPa) on vessels are in the focus of the design. The key to maintaining the integrity of the pressured pipes is the philosophy of leak-before-break(LBB). However, the temperature drop in the vicinity of a crack caused by Joule-Thomson cooling effect during leakage in a pressure vessel may impact on the validation of the LBB principle. Experiments are carried out to study the Joule-Thomson effect occurred during leaks through cracks on a pressure vessel. Argon is selected as the gas used in the experiment due to its incombustibility and similar Joule-Thomson coefficient to that of methane. A new Joule-Thomson testing facility with a pressure vessel is designed to perform the leak test. The pressure vessel is designed and fabricated according to ASME Boiling and Pressure Vessel Code. Liquid nitrogen cracking method is employed to fabricate a realistic through-thickness crack in a test plate. Under the condition of an ambient temperature of 30 ℃ and maximum internal pressure of 9.1 MPa, the lowest temperature measured along the crack line on the outside surface of the test plate is 12.5 ℃. It is 15 ℃ along the crack line on its inside surface and -9.2 ℃ of the escaping argon. And it is 7.9 ℃ along the crack diagonal line on its outside surface and -7.1 ℃ of the argon inside the pressure vessel. It shows that the changing trends of temperature in test plate along different crack directions are basically identical in the whole test process.