摘要
以荷兰斜纹编织筛网为研究对象,构建了三维模型,依据筛网空间结构推导出有效孔径计算公式,并对金属筛网的低温力学特性进行了数值计算分析,得到了低温推进剂充注预冷过程中筛网的单元结构热变形和应力的分布及变化情况。通过计算对比从293 K降温至20 K前后筛网孔隙率和有效孔径结构参数,发现304和316不锈钢筛网低温结构参数无明显差别;316不锈钢筛网在该降温过程中孔隙率和有效孔径的变化率与其编织密度有关,且变化率小于0.7%;降温过程中,筛网最大等效应力发生在纬线的扭曲处,且处于安全工作范围。
In this study,a three-dimensional model of the Dutch Twill Weave(DTW)screen was constructed and its mechanical properties were investigated.The formula of the pore diameter was derived from the spatial structure of the screen.The thermal deformation and stress distribution of the structural unit of DTW screen in the process of pre-cooling were obtained by numerically analyzing the mechanical properties of DTW screen.By comparing the void fraction and pore diameter before and after cooling from 293 K to 20 K,it is found that there is no significant difference between 304 and 316 stainless steel DTW screens;and the variations of the void fraction and pore diameter of 316 stainless steel DTW screen are related to the weave density with a change rate less than 0.7%.During the cooling process,the maximum equivalent stress of DTW screen occurs at the twist of the shute wires and it is in the scope of safety work.
作者
周勇瑞
朱庆春
耑锐
张鹏
Zhou Yongrui;Zhu Qingchun;Zhuan Rui;Zhang Peng(Institute of Refrigeration and Cryogenics,Shanghai Jiao Tong University,Shanghai 200240,China;Aerospace System Engineering Institute,Shanghai 201108,China)
出处
《低温与超导》
CAS
北大核心
2021年第11期25-31,共7页
Cryogenics and Superconductivity
基金
国家自然科学基金(51976117)
上海航天先进技术联合研究基金(USCAST2019-4)资助。
关键词
荷兰斜纹编织筛网
孔隙率
有效孔径
等效应力
Dutch Twill Weaves(DTW)
Void fraction
Pore diameter
Equivalent stress
