检索结果-南通市图书馆

MDBD等离子体激励器诱导流场耦合作用机理

同方期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

航空动力学报 2024年第3期39卷 90-101页

作者：徐泽阳高超王玉帅贾天昊王娜西北工业大学航空学院西安710072 西安航空学院液压技术研究院西安710077

为揭示多级介质阻挡放电(multi dielectric barrier discharge,MDBD)等离子体激励器诱导流场耦合机理,采用等离子体体积力模型与Navier-Stokes(N-S)方程结合的数值模拟方法,开展静止大气条件下4组激励器并联的MDBD诱导流场特性研究。结... 详细信息

为揭示多级介质阻挡放电(multi dielectric barrier discharge,MDBD)等离子体激励器诱导流场耦合机理,采用等离子体体积力模型与Navier-Stokes(N-S)方程结合的数值模拟方法,开展静止大气条件下4组激励器并联的MDBD诱导流场特性研究。结果表明:定常激励时,MDBD可以有效提高诱导射流速度与厚度、拓宽激励区域。非定常激励时,MDBD每级激励器对诱导涡起到持续的动量注入作用,延缓其耗散,并增强诱导涡的对流与掺混能力。激励频率对MDBD性能影响较大,激励频率f=20 Hz时,DBD诱导脉冲射流形成的低压区域对诱导涡起“拖拽”作用,使其加速向壁面靠近;f=50 Hz时,诱导涡出现融合现象,旋涡强度增强,对流速度提高,涡核高度降低;f=200 Hz时,诱导涡之间相互作用减弱,呈现为一组“涡簇”向激励器下游移动。

关键词：等离子体流动控制 MDBD激励器诱导涡激励频率

同方期刊数据库

准噶尔盆地莫索湾地区侏罗系超压预测技术研究

在线全文

学校读者我要写书评

暂无评论

地球科学进展 2024年第4期39卷 429-439页

作者：吴涛徐泽阳闫文琦费李莹刘荷冲赵靖舟李军杜治伟中国石油新疆油田公司勘探开发研究院新疆克拉玛依834000 西安石油大学陕西省油气成藏地质学重点实验室陕西西安710065 西安石油大学地球科学与工程学院陕西西安710065

准噶尔盆地莫索湾地区侏罗系普遍发育超压,实现高精度压力预测不仅有助于提升该地区成藏认识,还能够确保钻井安全。目前常见的超压预测方法普遍直接或间接受到超压成因的影响,其适用范围各不相同。在地质分析的基础上,结合超压段测井响... 详细信息

准噶尔盆地莫索湾地区侏罗系普遍发育超压,实现高精度压力预测不仅有助于提升该地区成藏认识,还能够确保钻井安全。目前常见的超压预测方法普遍直接或间接受到超压成因的影响,其适用范围各不相同。在地质分析的基础上,结合超压段测井响应特征,认为莫索湾地区侏罗系超压成因以深部压力传导为主、黏土矿物转化为辅,欠压实成因对超压的贡献极其有限。进一步根据相关模型的原理,筛选出3种适用于研究区的压力预测模型,分别为Fillippone模型、趋势回归模型和Bowers模型。结合实际应用效果对比,认为在早期无参考井时,适宜使用Fillippone模型进行随钻压力监测;在有少数参考井时,适宜使用Bowers模型;在勘探程度较高研究超压分布特征时,适宜使用趋势回归模型和Bowers模型。

关键词：超压预测莫索湾准噶尔盆地 Fillippone模型趋势回归模型 Bowers模型

同方期刊数据库

基于多源数据空间分析的城市体检方法与更新策略——以北京市海淀街道为例

在线全文

学校读者我要写书评

暂无评论

建筑师 2024年第2期 13-21页

作者：盛强李萌张宇于典杨婧怡王之轩许泽阳北京交通大学建筑与艺术学院建筑系北京交通大学建筑与艺术学院

在城市更新中基于多源数据与空间分析模型有助于精准发现问题并解析其形成的机理,对保证更新措施的有效性和长效性均有重要意义。本研究以北京市海淀街道的城市体检工作为例,以绿色出行、完整社区和健康城市为目标,综合多源大数据与实... 详细信息

在城市更新中基于多源数据与空间分析模型有助于精准发现问题并解析其形成的机理,对保证更新措施的有效性和长效性均有重要意义。本研究以北京市海淀街道的城市体检工作为例,以绿色出行、完整社区和健康城市为目标,综合多源大数据与实地调研小数据对慢行交通、社区商业和公共空间三方面的问题进行诊断,并应用空间句法模型对问题背后的路权分配、社区商业需求、居民户外活动的自组织空间规律进行了分析,探索了一种以数据空间分析为基础的城市问题诊断-分析-优化的工作流程。

关键词：城市体检城市更新完整社区户外活动空间句法

Advances in the origin of overpressures in sedimentary basins

在线全文

学校读者我要写书评

暂无评论

Petroleum Research 2018年第1期3卷 1-24页

作者： Jingzhou Zhao Jun Li zeyang xu Shaanxi Key Laboratory of Petroleum Accumulation Geology Xi'an Shiyou UniversityShaanxi 710065China School of Earth Sciences and Engineering Xi'an Shiyou UniversityShaanxi 710065China

Much progress in the studies on overpressuring mechanisms has been made during the past one to two decades.(1)The causes of overpressure are divided into five categories,namely,disequilibrium compaction,fluid expansion,diagenesis,tectonic compression and pressure *** fluid expansion involves hydrocarbon generation,oil cracking to gas and hydrothermal *** diagenesis includes smectite-to-illite transformation.(2)Six methods for identifying overpressure origin are proposed,including log curves combination analysis,Bowers method(loading-unloading diagram),velocitydensity crossplotting,correlation of porosities,pressure calculation and correlation,and comprehensive analyses.(3)With more and more application of empirical methods in the study of overpressure formation,almost all of the overpressure cases that are traditionally thought to be caused by disequilibrium compaction are denied totally or ***,the hydrocarbon generation is demonstrated to be the most significant mechanism for overpressure formation;the clay diagenesis(especially the smectiteillite transformation)as well as tectonic compression and pressure transfer are also important for overpressure *** addition,the overpressure formation in many basins is thought to be influenced by the combination of two or more overpressuring mechanisms.(4)Causes of overpressuring differ in lithology;for mudstones,the overpressure formation in source rocks is usually different from that of non-source rocks,the former of which is frequently related to hydrocarbon generation and sometimes also affected by diagenesis,while the later of which is commonly related to disequilibrium compaction,diagenesis and pressure transfer;for permeable rocks such as sandstones,overpressure is mainly caused by pressure transfer.(5)Because organic matter has an obvious influence on logging parameters such as density and acoustic velocity,an appropriate correction on the content of organic matter is needed when

关键词： Overpressure formation Disequilibrium compaction Fluid expansion Undercompaction Empirical method Theoretical analysis method Organic matter correction

Solution-processable precursor route for fabricating ultrathin silica film for high performance and low voltage organic transistors

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2017年第11期28卷 2143-2146页

作者： Shujing Guo Zhongwu Wang zeyang xu Shuguang Wang Kunjie Wu Shufeng Chen Zongbo Zhang Caihong xu Wenfeng Qiu Liqiang Li Inner Mongolia University of College of Chemistry and Chemical Engineering Hohhot 010021 China Advanced Nano-materials Division Key Laboratory of Nano-Devices and Applications Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou 215123 China Laboratory of High-Tech Materials Institute of ChemistryChinese Academy of Sciences Beijing 100190 China

Silica is one of the most commonly used materials for dielectric layer in organic thin-film transistors due to its excellent stability, excellent electrical properties, mature preparation process, and good compatibility with organic semiconductors. However, most of conventional preparation methods for silica film are generally performed at high temperature and/or high vacuum. In this paper, we introduce a simple solution spin-coating method to fabricate silica thin film from precursor route, which possesses a low leakage current, high capacitance, and low surface roughness. The silica thin film can be produced in the condition of low temperature and atmospheric environment. To meet various demands, the thickness of film can be adjusted by means of preparation conditions such as the speed of spin-coating and the concentration of solution. The p-type and n-type organic field effect transistors fabricated by using this film as gate electrodes exhibit excellent electrical performance including low voltage and high performance. This method shows great potential for industrialization owing to its characteristic of low consumption and energy saving, time-saving and easy to operate.

关键词： Silica Spin coating Thin film Transistor

变来流下翼型动态失速的协同射流控制数值模拟

在线全文

学校读者我要写书评

暂无评论

空气动力学学报 2023年第9期41卷 59-69页

作者：贾天昊高超许和勇徐泽阳西北工业大学翼型、叶栅空气动力学国家级重点实验室西安710072

针对直升机前飞时旋翼在变来流下出现动态失速的问题,发展了基于协同射流的翼型动态失速控制方法。选取NACA0012翼型为研究对象,基于转捩SST湍流模型求解非定常雷诺平均Navier-Stokes方程,开展不同参数下协同射流控制翼型动态失速的数... 详细信息

针对直升机前飞时旋翼在变来流下出现动态失速的问题,发展了基于协同射流的翼型动态失速控制方法。选取NACA0012翼型为研究对象,基于转捩SST湍流模型求解非定常雷诺平均Navier-Stokes方程,开展不同参数下协同射流控制翼型动态失速的数值模拟。研究结果表明,协同射流能够有效抑制变来流条件下的翼型动态失速。在变来流下,射流流道对翼型原始气动特性产生不利影响,功率系数的增长速度快于射流动量系数的增加,协同射流存在具有较好控制效果的最佳工作区间。协同射流通过与主流掺混来加速涡系演化,以抑制动态失速,通过增强弦向气流的动能以克服逆压梯度,从而抑制流动分离和促进流动再附着。在马赫数0.283、减缩频率0.151、前进比0.25的条件下,协同射流使翼型升力提高、阻力下降、负俯仰力矩峰降低、流动再附着提前,翼型气动特性得到明显改善。

关键词：动态失速非定常协同射流变来流前进比

Experimental investigation of dynamic stall flow control using a microsecond-pulsed plasma actuator

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2023年第3期25卷 193-203页

作者：徐泽阳武斌高超王娜贾天昊 School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072People’s Republic of China Xi’an Aeronautical Institute Xi’an 710072People’s Republic of China

To alleviate the performance deterioration caused by dynamic stall of a wind turbine airfoil,the flow control by a microsecond-pulsed dielectric barrier discharge(MP-DBD) actuator on the dynamic stall of a periodically pitching NACA0012 airfoil was investigated *** pressure measurements with high temporal accuracy were employed in this study,and the unsteady characteristics of the boundary layer were investigated by wavelet packet analysis and the moving root mean square method based on the acquired *** experimental Mach number was 0.2,and the chord-based Reynolds number was 870 *** dimensionless actuation frequencies F+ were chosen to be 0.5,1,2,and 3,*** the light dynamic regime,the MP-DBD plasma actuator plays the role of suppressing flow separation from the trial edge and accelerating the flow reattachment due to the high-momentum freestream flow being entrained into the boundary ***,actuation effects were promoted with the increasing dimensionless actuation frequency F+.The control effects of the deep dynamic stall were to delay the onset and reduce the strength of the dynamic stall vortex due to the accumulating vorticity near the leading edge being removed by the induced coherent vortex *** laminar fluctuation and Kelvin-Helmholtz(K-H) instabilities of transition and relaminarization were also mitigated by the MP-DBD actuation,and the alleviated K-H rolls led to the delay of the transition onset and earlier laminar reattachment,which improved the hysteresis effect of the dynamic *** the controlled cases of F+=2,and F+=3,the laminar fluctuation was replaced by relatively low frequency band disturbances corresponding to the harmonic responses of the MP-DBD actuation frequency.

关键词： microsecond-pulsed plasma actuator dielectric barrier discharge flow control dynamic stall wind turbine wind tunnel experiment

基于测井响应特征的烃源岩古超压成因分析——以鄂尔多斯盆地三叠系延长组7段烃源岩为例

在线全文

学校读者我要写书评

暂无评论

天然气地球科学 2023年第11期34卷 1950-1960页

作者：徐泽阳刘震赵靖舟党佳城李军唐子怡中国石油大学(北京)油气资源与探测国家重点实验室北京102249 中国石油大学(北京)地球科学学院北京102249 西安石油大学/陕西省油气成藏地质学重点实验室陕西西安710065 西安石油大学地球科学与工程学院陕西西安710065 中国石油新疆油田分公司勘探开发研究院新疆克拉玛依834000

成藏期古压力对油气分布具有重要影响,但对其识别及成因分析的难度也远高于现今压力。为探讨鄂尔多斯盆地长7段是否存在古超压及其测井响应机制,提出了一套有机质含量影响的定量分析模型。通过经典超压成因判识模板反演分析与盆地模拟... 详细信息

成藏期古压力对油气分布具有重要影响,但对其识别及成因分析的难度也远高于现今压力。为探讨鄂尔多斯盆地长7段是否存在古超压及其测井响应机制,提出了一套有机质含量影响的定量分析模型。通过经典超压成因判识模板反演分析与盆地模拟正演分析相结合,讨论了研究区长7段古超压成因及其成藏意义。结果显示:长7段高有机质含量对测井参数具有显著影响,定量分析认为由有机质引起的声波时差增量及密度减量分别在2.56~169.78μs/m和0.01~0.61 g/cm^(3)之间。以去除有机质贡献的声波时差和密度资料为依据,利用计算孔隙度对比法以及声波—密度交会图法进行分析,认为长7段存在过古超压,且生烃导致的流体膨胀增压是成藏期超压的主要来源。结合盆地模拟,指出生烃增压在时间上与烃源岩热演化匹配,在空间上与油藏分布吻合,进一步佐证了生烃增压成因的认识。认为古压力是重要的成藏主控因素之一,烃类聚集分布于高剩余压力区域中的局部低剩余压力区。

关键词：古超压超压成因生烃增压古压力恢复

在线全文

学校读者我要写书评

暂无评论

油酸单乙醇酰胺聚氧乙烯醚微乳液体系的研究

化学通报 2022年第2期85卷 253-258页

作者：张云刘琪灵许虎君林良良黄璞许泽洋苏州绿叶日用品有限公司苏州215151 江南大学化学与材料工程学院无锡214122

以油酸单乙醇酰胺聚氧乙烯醚作为乳化剂制备水包油型微乳液。通过拟三元相图、粒径大小及粒径分布确定较优配方:复配表面活性剂(由油酸单乙醇酰胺聚氧乙烯醚和吐温20组成)的亲水亲油平衡值(HLB值)为15,助表面活性剂为正丁醇,复配表面活... 详细信息

以油酸单乙醇酰胺聚氧乙烯醚作为乳化剂制备水包油型微乳液。通过拟三元相图、粒径大小及粒径分布确定较优配方:复配表面活性剂(由油酸单乙醇酰胺聚氧乙烯醚和吐温20组成)的亲水亲油平衡值(HLB值)为15,助表面活性剂为正丁醇,复配表面活性剂与助表面活性剂的质量比(K;值)为1,混合表面活性剂与正辛烷的质量比(S/O值)=1∶1,水添加量70%。此时该微乳体系平均粒径为18.6nm,多分散指数(PDI值)为0.206。当微乳体系含水量大于70%时,可形成水包油型微乳液。透射电镜照片显示,此时微乳液滴分布均匀,呈球形。较优配方的微乳液具有良好的离心稳定性和耐高温性。

关键词：油酸单乙醇酰胺聚氧乙烯醚微乳液拟三元相图电导率稳定性