摘要
本文利用数值模拟的方法研究了高压氢气泄漏所产生的欠膨胀氢气射流的激波结构。采用二维轴对称几何模型,分别模拟了不同压力比下,出口直径为1 mm的氢气射流。模拟得到了不同压力比下激波结构的形态和特征尺寸,包括马赫盘的位置、直径和边界层的厚度等。通过计算结果与实验测量的比较表明,当泄漏源压力小于3 MPa时,数值模拟不能够得到实验中观测到的典型激波结构;而当泄漏源压力达到3 MPa及以上时,数值模拟就可以成功地计算欠膨胀射流的激波结构.此外,模拟还得到了沿射流中心线的气流马赫数、压力和温度等一系列气流参数。
Shock structures of high pressure under-expanded hydrogen jets were simulated for hydrogen releases for different pressure ratios. Two-dimensional axisymmetric geometries were used and the diameter of the leak orifice was 1 ram. The Mach disk location, Mach disk diameter, and thickness of the boundary layer were calculated for each of the pressure ratio. The calculations were then compared with the measurements using Schlieren photography. The results show that the simulation is not able to calculate the typical shock structures observed in experiments when the storage pressure is less than 3 MPa; however, shock structures are successfully reproduced when the storage pressure increases to 3 MPa. Moreover, the Mach number, pressure and temperature along the jet centerline were also calculated.
作者
李雪芳
王俞杰
罗峰
Ethan S Hecht
柯道友
LI Xue-Fang1, WANG Yu-Jie2 ,LUO Feng1, Ethan S Hecht3, David M Christopher2(1. Institute of Thermal Science and Technology, Shandong University, Jinan 250061, China; 2. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China; 3. Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94550, United State)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2018年第4期880-886,共7页
Journal of Engineering Thermophysics
基金
国家自然科学基金面上项目(No.51706125
No.51476091)
山东省自然科学基金项目(No.ZR2017BEE003)
山东大学基本科研业务费专项资金资助
关键词
氢气泄漏
欠膨胀射流
激波结构
数值模拟
纹影法
hydrogen releases
under-expanded jets
shock structures
numerical simulationschlieren photography
