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Effects of critical geometric parameters on the optical performance of a conical cavity receiver
Hu XIAO, Yanping ZHANG, Cong YOU, Chongzhe ZOU, Quentin FALCOZ
《能源前沿(英文)》 2019年 第13卷 第4期 页码 673-683 doi: 10.1007/s11708-019-0630-2
关键词: parabolic collector conical cavity receiver critical geometric parameters optical performance
Effect of cavity defect on the triaxial mechanical properties of high-performance concrete
Yanbin ZHANG; Zhe WANG; Mingyu FENG
《结构与土木工程前沿(英文)》 2022年 第16卷 第5期 页码 600-614 doi: 10.1007/s11709-022-0821-5
关键词: high-performance concrete cavity conventional triaxial compression pressurized liquid modified power-law criterion
Numerical simulation of the heat flux distribution in a solar cavity receiver
Yueshe WANG, Xunwei DONG, Jinjia WEI, Hui JIN
《能源前沿(英文)》 2011年 第5卷 第1期 页码 98-103 doi: 10.1007/s11708-010-0019-8
关键词: solar cavity receiver Monte Carlo method heat flux distribution
―Summary of investigations on rotating cavity at IDG, RWTH Aachen University
Dieter BOHN, Jing REN,
《能源前沿(英文)》 2009年 第3卷 第4期 页码 489-497 doi: 10.1007/s11708-009-0040-y
Chongzhe ZOU, Huayi FENG, Yanping ZHANG, Quentin FALCOZ, Cheng ZHANG, Wei GAO
《能源前沿(英文)》 2019年 第13卷 第2期 页码 284-295 doi: 10.1007/s11708-019-0613-3
关键词: cylindrical cavity receiver 3-D numerical simulation geometric optimization direct normal irradiation
Influence of boundary conditions and turntable speeds on the stability of hydrostatic oil cavity
Zhaomiao LIU, Chengyin ZHANG, Feng SHEN
《机械工程前沿(英文)》 2011年 第6卷 第3期 页码 359-368 doi: 10.1007/s11465-011-0222-2
The flow, bearing, and carrying capacity of the cycloidal hydrostatic oil cavity in hydrostatic turntable systems are numerically simulated, considering the rotation speeds of a turntable from 0 to 5 m/s and different boundary conditions. The vortex effect is weakened, and the stability of the oil cavity is enhanced with the increase in lubricant viscosity. However, the increase in inlet speed, depth, and inlet radius of the oil cavity causes the vortex effect to increase and the stability of oil cavity to reduce. With the increase in the oil film thickness, the carrying capacity of the oil cavity diminishes. The oil cavity pressure increases along the direction of the motion of the turntable; it is distributed unevenly because of the rotation of the turntable. With the increase in turntable speed, the location and size of the vortex scope in the oil cavity flow field and the strength of the vortex near the entrance gradually weaken and move away from the entry. The distribution of pressure is determined by the locations of the vortex. When the vortex is close to the wall, the wall pressure increases at its location. Otherwise, the wall pressure decreases first and then increases after the center of the vortex.
关键词: hydrostatic oil cavity flow state oil cavity pressure stability vortex
张梅,张民庆,朱鹏飞,黄鸿健
《中国工程科学》 2009年 第11卷 第12期 页码 13-19
高压富水充填溶腔具有水量大、水压高、规模范围大、充填介质复杂的特征,工程施工风险极高,采用传统的注浆法进行处理,受地层的不均一性、材料选择、技术水平的影响,难免会出现注浆盲区,施工中一旦注浆盲区被高压水击穿,将会发生大规模突水突泥,造成灾害。针对宜万铁路所遇到的高压富水充填溶腔,通过科技攻关,提出采取释能降压新技术进行处治。经现场实践,安全、经济、可靠,并取得了成功。释能降压技术是针对高压富水充填溶腔采取有计划、有目的的精确爆破揭示,从而释放溶腔所存储的能量,降低施工及运营过程中水土压力对隧道形成影响,之后,通过配套处治措施完成溶腔治理。
Hydraulic fracturing pressure of concentric double-layered cylinder in cohesive soil
《结构与土木工程前沿(英文)》 2021年 第15卷 第4期 页码 937-947 doi: 10.1007/s11709-021-0754-4
关键词: hydraulic fracturing pressure layered cavity expansion theory triaxial fracturing test cohesive soil
Yong SHUAI, Xinlin XIA, Heping TAN
《能源前沿(英文)》 2010年 第4卷 第4期 页码 488-495 doi: 10.1007/s11708-010-0007-z
关键词: Monte Carlo method solar energy radiation performance cavity receiver
利用太赫兹时域光谱法和微腔器件检测样品:综述 Special Feature on Precision Measurement and Instr
Lin CHEN, Deng-gao LIAO, Xu-guang GUO, Jia-yu ZHAO, Yi-ming ZHU, Song-lin ZHUANG
《信息与电子工程前沿(英文)》 2019年 第20卷 第5期 页码 591-607 doi: 10.1631/FITEE.1800633
王占江,蔡宗义,郑学锋,朱玉荣
《中国工程科学》 2009年 第11卷 第4期 页码 46-49
为研究水中爆炸对围岩的增耦,在一个直径1.6 m的水泥砂浆半球体装置上,将其中心预留的直径0.3 m的腔室内注水和置入水泥砂浆芯体,对比性地进行了一系列的1.00 g TNT (2,4,6—三硝基甲苯)当量的填实和空腔爆炸实验。水泥砂浆球表运动测量数据表明,与水泥砂浆中的空腔解耦相比,水中空腔爆炸的解耦效果较差,尤其水腔中爆炸可大大增强爆炸能量的耦合。可以推断,水下爆炸会明显增强围岩中的爆炸应力波强度,近水域中的空中爆炸也可能会增强围岩中的爆炸能耦合,因而相对于围岩和堤坝中同距离、同药量的爆炸来讲,所引起
Thomas ELLINGHAM, Hrishikesh KHARBAS, Mihai MANITIU, Guenter SCHOLZ, Lih-Sheng TURNG
《机械工程前沿(英文)》 2018年 第13卷 第1期 页码 96-106 doi: 10.1007/s11465-018-0498-6
A three-stage molding process involving microcellular injection molding with core retraction and an “out-of-mold” expansion was developed to manufacture thermoplastic polyurethane into lightweight foams of varying local densities, microstructures, and mechanical properties in the same microcellular injection molded part. Two stages of cavity expansion through sequential core retractions and a third expansion in a separate mold at an elevated temperature were carried out. The densities varied from 0.25 to 0.42 g/cm3 (77% to 62% weight reduction). The mechanical properties varied as well. Cyclic compressive strengths and hysteresis loss ratios, together with the microstructures, were characterized and reported.
关键词: thermoplastic polyurethane microcellular injection molding cavity expansion compressive strength hysteresis loss ratio
Effect of triethylamine treatment of titanium silicalite-1 on propylene epoxidation
Juan XU,Yaquan WANG,Wenping FENG,Yi LIN,Shuhai WANG
《化学科学与工程前沿(英文)》 2014年 第8卷 第4期 页码 478-487 doi: 10.1007/s11705-014-1453-7
关键词: titanium silicalite-1 triethylamine hollow cavity epoxidation of propylene catalyst life
Three-dimensional numerical simulation for plastic injection-compression molding
Yun ZHANG, Wenjie YU, Junjie LIANG, Jianlin LANG, Dequn LI
《机械工程前沿(英文)》 2018年 第13卷 第1期 页码 74-84 doi: 10.1007/s11465-018-0490-1
Compared with conventional injection molding, injection-compression molding can mold optical parts with higher precision and lower flow residual stress. However, the melt flow process in a closed cavity becomes more complex because of the moving cavity boundary during compression and the nonlinear problems caused by non-Newtonian polymer melt. In this study, a 3D simulation method was developed for injection-compression molding. In this method, arbitrary Lagrangian-Eulerian was introduced to model the moving-boundary flow problem in the compression stage. The non-Newtonian characteristics and compressibility of the polymer melt were considered. The melt flow and pressure distribution in the cavity were investigated by using the proposed simulation method and compared with those of injection molding. Results reveal that the fountain flow effect becomes significant when the cavity thickness increases during compression. The back flow also plays an important role in the flow pattern and redistribution of cavity pressure. The discrepancy in pressures at different points along the flow path is complicated rather than monotonically decreased in injection molding.
关键词: injection-compression molding simulation injection molding melt flow cavity pressure
张书练
《中国工程科学》 2005年 第7卷 第3期 页码 27-34
以笔者发现的激光频率分裂、模竞争、腔调谐等双折射双频激光物理效应,研制成激光器纳米测尺。激光器自身就是纳米量级位移传感器,利用腔内双折射元件把一个激光频率分裂成2个频率(⊥光模和∥光模);当一腔镜沿激光器轴线移动并使这两个频率扫过激光增益区时,强烈和中等程度的竞争交替出现,把出光带宽分成3个等宽区间;合激光纵膜间隔为出光带宽的4/3时,在腔镜移动第一个λ/8波长内强竞争使⊥光模抑制掉∥光模,第二个λ/8波长内中度竞争使⊥光模和∥光模可一起振荡,第三个λ/8波长内强竞争使∥光模抑制掉⊥光模,第四个λ/8波长内⊥光模∥不振荡,激光器无光输出;4种状态重复一次,反射镜移动λ/2,计算出状态数,可知腔镜位移。由4个区域光偏振各不相同来判断腔镜位移方向。腔镜经一个机械测杆和被测物接触,实现被测物位移测量。测量范围已达15mm,分辩率79.08mm,线性度5×10-6,重复性2σ优于0.314μm。该成果是激光技术和精密计量两领域交叉融合取得的自主原创性、有重要意义的突破性进展。
标题 作者 时间 类型 操作
Effects of critical geometric parameters on the optical performance of a conical cavity receiver
Hu XIAO, Yanping ZHANG, Cong YOU, Chongzhe ZOU, Quentin FALCOZ
期刊论文
Effect of cavity defect on the triaxial mechanical properties of high-performance concrete
Yanbin ZHANG; Zhe WANG; Mingyu FENG
期刊论文
Numerical simulation of the heat flux distribution in a solar cavity receiver
Yueshe WANG, Xunwei DONG, Jinjia WEI, Hui JIN
期刊论文
―Summary of investigations on rotating cavity at IDG, RWTH Aachen University
Dieter BOHN, Jing REN,
期刊论文
Geometric optimization model for the solar cavity receiver with helical pipe at different solar radiation
Chongzhe ZOU, Huayi FENG, Yanping ZHANG, Quentin FALCOZ, Cheng ZHANG, Wei GAO
期刊论文
Influence of boundary conditions and turntable speeds on the stability of hydrostatic oil cavity
Zhaomiao LIU, Chengyin ZHANG, Feng SHEN
期刊论文
Numerical simulation and experiment research of radiation performance in a dish solar collector system
Yong SHUAI, Xinlin XIA, Heping TAN
期刊论文
利用太赫兹时域光谱法和微腔器件检测样品:综述
Lin CHEN, Deng-gao LIAO, Xu-guang GUO, Jia-yu ZHAO, Yi-ming ZHU, Song-lin ZHUANG
期刊论文
Microcellular injection molding process for producing lightweight thermoplastic polyurethane with customizable properties
Thomas ELLINGHAM, Hrishikesh KHARBAS, Mihai MANITIU, Guenter SCHOLZ, Lih-Sheng TURNG
期刊论文
Effect of triethylamine treatment of titanium silicalite-1 on propylene epoxidation
Juan XU,Yaquan WANG,Wenping FENG,Yi LIN,Shuhai WANG
期刊论文
Three-dimensional numerical simulation for plastic injection-compression molding
Yun ZHANG, Wenjie YU, Junjie LIANG, Jianlin LANG, Dequn LI
期刊论文