Results 21 to 30 of about 12,492 (169)

零区气流场对湍流模型参数C1e敏感度的仿真分析

open access: yesGaoya dianqi, 2016
湍流模型参数的合理设置是气流场仿真中的要素之一。对于电流零区湍流模型的选择及湍流参数的设置,研究者持有不同的观点。文中针对零区气流场对标准k-epsilon湍流模型参数敏感度大小的问题,基于磁流体动力学原理,以252 k V压气式结构燃弧阶段的动态仿真为基础,计算了电流过零阶段湍流模型参数C1e对气流场的影响偏差百分比。通过特定监测点处气压与温度的对比,分析讨论了引起敏感度数值差异较大的原因。研究表明,湍流模型参数C1e的改变对喷口区域内气体压力的影响较小,对于气体温度的影响相对较大 ...
吴杰   +6 more
doaj  

Bimetallic NiCo Loaded on the Nitrogen‐Rich Modified Lignin‐Derived Carbon Coordination Network for Accelerated Oxygen Reduction Kinetics

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT The development of novel oxygen electrocatalysts with cost‐effectiveness, scalability, high catalytic activity, and stability presents a significant challenge for zinc–air batteries (ZABs). The nitrogen‐rich lignin coordination network structure is synthesized through amine modification of lignin.
Ping‐Xian Feng   +8 more
wiley   +1 more source

Experimental study of flap on controlling wake vortex [PDF]

open access: yes, 2015
飞机尾流是现代民航机飞行过程中产生的一种大尺度、高能量的漩涡,是飞机在产生升力的同时不可避免的结果。它的存在严重威胁着后续飞机的飞行安全。为了避免后续飞机遭遇尾流发生事故,国际民航组织(ICAO)设置了最小尾流间隔标准,但长时间未消散的尾流限制了机场飞机的起降频率,造成很多大型机场拥挤不堪。针对如何使尾流快速消散的问题,国内外学者进行了深入的研究,现在比较受认可的尾流控制方式是主动在主翼涡周围引入一个扰动来诱发翼尖涡的不稳定性使其快速消散。 本文所有工作均在厦门大学流体 ...
傅向向
core  

Formation and evolution of the hydroynamic field and its fluid property in the Up Palaeozoic reservoir of the Ordos Basin(地下水动力场的形成、演化及其流体特征分析——以鄂尔多斯盆地上古生界为例)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2003
油气的运移、聚集与地下水动力场的形成与演化密切相关.随着沉积盆地的形成与演化,地下水动力场也有形成、发展和消亡的过程.讨论鄂尔多斯盆地地下水动力场的形成与演化,推断其油气的分布规律:大气水下渗——向心流处为水区,天然气离心流区为气区,越流天然气漏失区对应于气水共存过渡区.
JINAi-min(金爱民)   +5 more
doaj   +1 more source

An Asymmetric Sandwich‐Structured Hydrogel Enables High‐Output Stable Moist–Electric Generation and Self‐Powered Sensing

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Moisture‐enabled electricity generation technology offers a new paradigm for sustainable energy harvesting, but its practical applications are still limited by issues such as low output power and insufficient long‐term stability. In this paper, an asymmetric sandwich‐structured hydrogel moist–electric generator (SSHMEG) with an ion ...
Peng Chen   +7 more
wiley   +1 more source

气井涡流携液机理和携液效率数值模拟研究

open access: yesShiyou jixie, 2015
针对目前气井涡流携液机理和效率认识不清,现场工程设计与分析主要依据经验,影响应用效果等问题,运用AutoCAD和Fluent流体模拟软件,建立了涡流工具气液两相流场模型,分析了气液混合物通过涡流工具前后的流动轨迹、流型变化特征和携液效率变化规律。研究结果表明,涡流工具将气液两相雾流转换为螺旋环流,液体以液膜形式沿管壁螺旋向上流动,而气体在油管中心以更高的速度流动。这种流态能够降低流动过程中的压力损失24.3%,提高流体速度13.5%,减小持液率3.3%,减弱气液两相之间的滑脱,提高气体携液能力 ...
, 1
doaj  

Hybrid Probiotic Hydrogel With Curcumin‐Loaded MnO2 Nanoparticles Enhances Diabetic Wound Healing Through Multimodal Microenvironmental Regulation

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT Skin wound injuries are often accompanied by bacterial infections and severe inflammation. Especially, M1‐type macrophages at the wound site can trigger a cascade of inflammatory responses, mediating a vicious cycle of inflammation. Meanwhile, hypoxia further exacerbates vascular damage and constriction in the wound microenvironment, thereby ...
Xianfeng Wang   +6 more
wiley   +1 more source

Role of Examinations on Phonatory Airflow and Breathing Airflow in Voice Function Assessment [PDF]

open access: yes, 2015
第一部分s/z比值在嗓音功能评估中的意义 目的:测量正常嗓音组和声带良性增生性疾病组的s/z比值,确定正常嗓音组的s/z比值范围,比较正常嗓音组和声带疾病组的s/z比值有无显著差异,探讨s/z比值对提示诊断声带疾方法:实验对象为正常对照组58例(男:36例,女:22例),疾病组48例(男:23例,女性:25例)。嘱实验对象先深吸气,呼气起始发/s/音(音强控制在65dB左右)至呼气结束停止发音,同一受试者音强大小变化不超过2dB。检查者记录发声时间。同样的方法测量发/z/的时间 ...
潘晗
core  

井下涡流工具排水采气机理研究

open access: yesShiyou jixie, 2015
涡流工具排液是一种新型气井排水采气工艺。目前国内外针对井下涡流工具的室内及现场试验,仅获得部分宏观工作特性,缺乏深入的理论研究,具体排液机理不够清晰,限制了该工艺的推广应用。鉴于此,采用有限元分析方法建立涡流工具气液两相螺旋流动的数值模型,并借助CFD软件对其流动过程进行仿真。通过流动规律的预测及分析,确定出井下涡流工具排水采气机理。研究结果表明,涡流工具可形成螺旋上升的管壁液膜流和快速上升的中心气核流动;引发的高速螺旋涡流,有效降低了气液流动阻力,提升了采气速度,同时增强了气流的携液能力 ...
杨旭东, 李丽, 张军, 卫亚明
doaj  

A Molten Salt Strategy to Convert Bulk Nb2O5 Into 2D Nonlayered Niobium Nitride Nanosheets for Superior Pseudocapacitive Storage

open access: yesRare Metals, Volume 45, Issue 3, March 2026.
ABSTRACT Two‐dimensional (2D) nonlayered niobium nitrides have attracted considerable interest for electrochemical energy storage. However, the synthesis of these materials is hampered by their nonlayered crystal structures, which are characterized by strong three‐dimensional chemical bonding.
Rui Huo   +7 more
wiley   +1 more source

Home - About - Disclaimer - Privacy