检索结果-南通市图书馆

Experimental Study on the Film Cooling Characteristics of Three Complex Tip Structures

Journal of Thermal Science 2023年第4期32卷 1378-1392页

作者： LIN Juqiang LI Haiwang YOU Ruquan liu runzhou TAO Zhi liu Song School of Energy and Power Engineering Beihang UniversityBeijing100191China Research Institute for Aero-Engines Beihang UniversityBeijing100191China National Key Laboratory of Science and Technology on Aero Engines Aero-thermodynamics Beijing100191China AECC Sichuan Gas Turbine Establishment Sichuan610500China

The turbine blades of aircrafts must be properly cooled to prevent engine ***,to investigate the influence of the tip structure on the film cooling effect,pressure-sensitive paint test technology was used to determine the adiabatic film cooling effectiveness in this *** experiment was completed in a cascade comprising three straight *** effects of the blowing ratio,density ratio,tip clearance,and tip structure on film cooling efficiency were *** experimental results demonstrated that,as the blowing ratio increased,the film coverage area and film cooling efficiency increased under most experimental ***,the film cooling efficiency was found to initially increase,and subsequently decrease,as the blowing ratio *** respective influences of the density ratio and tip clearance on the film cooling efficiency were found to be *** density ratio experiments revealed that a high-density ratio can result in better film coverage than the low-density-ratio *** tip clearance experimental results indicated that a small tip clearance promotes an increase in film cooling efficiency;this is because the small tip clearance negatively affects the main stream leakage flow,which can reduce the film coverage *** the conditions of the Base case 2 configuration,a blowing ratio of 2.1,and a tip clearance of 0.6%h,the average film cooling efficiency of the blade tip was *** the three blade tip structures applied in this study,Base case 2 demonstrated higher film cooling efficiency than the other two blade tip structures under the conditions of the same blowing ratio,tip clearance,and density ratio.

关键词： film cooling tip structure pressure-sensitive paint leakage flow

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Transcriptome-wide analysis of mRNA N^(6)-methyladenosine modification in the embryonic development of Spodoptera frugiperda

引用

Insect Science 2023年第5期30卷 1229-1244页

作者： Yaqing Chen Yushan Lai runzhou liu Lin Yao Xiao-Qiang Yu Xiaoyun Wang Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology Institute of Insect Science and TechnologySchool of Life SciencesSouth China Normal UniversityGuangzhouChina

N^(6)-methyladenosine(m^(6)A)RNA is the most abundant modification of mRNA,and has been demonstrated in regulating various post-transcriptional *** studies have shown that m^(6)A methylation plays key roles in sex determination,neuronal functions,and embryonic development in Drosophila and ***,we analyzed transcriptome-wide profile of m^(6)A modification in the embryonic development of the destructive agricultural pest Spodoptera *** found that the 2 key mRNA m^(6)A methyltransferases SfrMETTL3 and SfrMETTL14 have high homologies with other insects and mammals,suggesting that SfrMETTL3 and SfrMETTL14 may have conserved function among different *** methylated RNA immunoprecipitation sequencing analysis,we obtained 46869 m^(6)A peaks representing 8587 transcripts in the 2-h embryos after oviposition,and 41389 m^(6)A peaks representing 9230 transcripts in the 24-h *** addition,5995 m^(6)A peaks were differentially expressed including 3752 upregulated and 2243 downregulated *** analysis with Gene Ontology and Kyoto Encyclopedia of Genes and Genomes suggested that differentially expressed m^(6)A peak-modified genes were enriched in cell and organ development between the 2-and 24-h *** conjoint analysis of methylated RNA immunoprecipitation-seq and RNA-seq data,we found that RNA m^(6)A methylation may regulate the transcriptional levels of genes related to tissue and organ development from 2-to 24-h *** study reveals the role of RNA m^(6)A epigenetic regulation in the embryonic development of ***,and provides new insights for the embryonic development of insects.

关键词： embryonic cdevelopment N^(6)-methyladenosine RNA methylation Spodopterafrugiperda

来源：

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

小半径曲线上钢箱梁匝道桥设计

引用

山西建筑 2020年第13期46卷 122-123页

作者：刘润舟中铁上海设计院集团有限公司南昌院江西南昌330002

以某城市互通立交中一联主跨50 m的连续钢箱梁匝道桥为例,从结构构造设计、结构总体计算和梁体倾覆稳定性等方面进行分析研究,总结小半径曲线上钢箱梁匝道桥设计的特点,为类似项目提供参考。

关键词：曲线桥钢箱梁匝道桥倾覆稳定性

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于双层壁冷却结构的综合冷效数值解耦研究

引用

航空动力学报 2024年第5期39卷 71-79页

作者：刘润洲李海旺由儒全黄毅陶智北京航空航天大学航空发动机研究院北京102206 北京航空航天大学能源与动力工程学院北京102206 北京航空航天大学航空发动机气动热力国家级重点实验室北京102206

采用数值解耦的方法,定量分析了双层壁平板冷却结构的综合冷效与内部冷却、气膜孔内冷却和冷气覆盖之间的关系。吹风比为0.25、0.5、1和1.5。通过研究发现,吹风比对双层壁模型的综合冷效有明显影响。当吹风比由0.25增大到1.5时,综合冷... 详细信息

采用数值解耦的方法,定量分析了双层壁平板冷却结构的综合冷效与内部冷却、气膜孔内冷却和冷气覆盖之间的关系。吹风比为0.25、0.5、1和1.5。通过研究发现,吹风比对双层壁模型的综合冷效有明显影响。当吹风比由0.25增大到1.5时,综合冷效增大57.9%。内部冷却占主导地位的区域主要是冲击气流的驻点区。气膜孔内冷却影响最大的区域为气膜孔出口的上游,而且沿流向孔内冷却的影响逐渐减小。冷气覆盖对综合冷效的影响沿流向逐渐积累,在第3个气膜孔出口附近冷气覆盖的影响最大。而且在冷气覆盖区域的影响要大于在远离气膜孔区域的影响。当吹风比增大至1时,孔内冷却对综合冷效的影响已经超过了冷气覆盖。

关键词：综合冷效气膜冷却内部冷却解耦吹风比平板模型

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于柔度指标的变截面连续梁桥损伤识别方法

引用

佳木斯大学学报（自然科学版） 2023年第4期41卷 113-116,166页

作者：刘润州安徽建筑大学土木工程学院安徽合肥230601

针对模态柔度及其衍生指标具有对结构损伤高灵敏性的特点,为研究基于柔度类指标的损伤识别方法在变截面连续梁桥上的适用性,提出一种基于柔度曲率面积差的桥梁损伤识别新指标。首先利用结构振型和固有频率构建柔度矩阵,其次对柔度矩阵... 详细信息

针对模态柔度及其衍生指标具有对结构损伤高灵敏性的特点,为研究基于柔度类指标的损伤识别方法在变截面连续梁桥上的适用性,提出一种基于柔度曲率面积差的桥梁损伤识别新指标。首先利用结构振型和固有频率构建柔度矩阵,其次对柔度矩阵进行行列两次差分得到柔度曲率矩阵,然后提取损伤前后柔度曲率矩阵主对角元素构建柔度曲率面积差(Flexibility curvature area difference,FCAD)指标,以三跨变截面连续梁桥有限元模型为研究对象,对不同损伤工况进行模拟分析以验证方法的可行性和有效性,通过引入不同强度噪声来验证该方法的抗噪性。研究结果表明:柔度曲率面积差方法可有效对三跨变截面连续梁桥的损伤进行定位,且所提方法具有较好的噪声鲁棒性。

关键词：变截面连续梁桥损伤识别柔度矩阵柔度曲率面积差数值模拟

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

m法群桩基础整体刚度等代模拟分析

引用

山西建筑 2017年第27期43卷 136-137页

作者：刘润舟南昌铁路勘测设计院有限责任公司江西南昌330002

总结基于"m"法的单柱弹簧模型和双柱框架模型2种等代模拟群桩基础整体刚度的方法,对2种等代桩基模型进行比较分析,验证了等代模型的正确性,为类似工程提供参考。

关键词：群桩基础整体刚度等代模拟 m法

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

快速流化床用于丁烯氧化脱氢制取丁二烯热试装置的自控系统

引用

化学反应工程与工艺 1988年第1期 82-88页

作者：刘健生张润周黄哲中国科学院山西煤化所

本工作建立了内径为2.6cm 快速流化床反应器用于丁烯氧化脱氢制取丁二烯的热试装置的自控系统,在正常操作条件下,结果表明本系统的操作偏差度与给定值的变化是一致的,计算机的联用技术给计算机在工业上的广泛应用提供了一条新的途径。

关键词：自控系统给定值规定值调节阀控制阀巡回检测系统自动检测系统调节器控制器热试丁二烯二乙烯烯烃设定值热电偶热敏元件丁烯氧化脱氢制取装置流化床沸腾床化工机械

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nonlinear sealing force of a seawater balance valve used in an 11000-meter manned submersible

引用

Frontiers of Mechanical Engineering 2023年第1期18卷 287-301页

作者： Zhenyao WANG Yinshui liu Qian CHENG runzhou XU Yunxiang MA Defa WU School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China

Balance valve is a core component of the 11000-meter manned submersible“struggle,”and its sealing performance is crucial and challenging when the maximum pressure difference is 118 *** increasing sealing force improves the sealing performance and increases the system’s energy consumption at the same time.A hybrid analytical–numerical–experimental(ANE)model is proposed to obtain the minimum sealing force,ensuring no leakage at the valve port and reducing energy consumption as much as *** effects of roundness error,environmental pressure,and materials on the minimum sealing force are considered in the ANE *** basic form of minimum sealing force equations is established,and the remaining unknown coefficients of the equations are obtained by the finite element method(FEM).The accuracy of the equation is evaluated by comparing the independent FEM data to the equation *** of the comparison show good agreement,and the difference between the independent FEM data and equation data is within 3%when the environmental pressure is 0–118 ***,the minimum sealing force equation is applied in a balance valve to be experimented using a deep-sea simulation *** balance valve designed through the minimum sealing force equation is leak-free in the ***,the minimum sealing force equation is suitable for the ultrahigh pressure balance valve and has guiding significance for evaluating the sealing performance of ultrahigh pressure balance valves.

关键词： seawater balance valve sealing performance hybrid ANE model FEM minimum sealing force equation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Knowledge mapping analysis of the track and hotspot of water lubrication:A scientometrics review

引用

Friction 2023年第9期11卷 1557-1591页

作者： runzhou XU Defa WU Zhenyao WANG Yipan DENG Qian CHENG Hao PANG Wenshu WEI Yinshui liu State Key Laboratory of Digital Manufacturing Equipment and Technology School of Mechanical Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Beijing Tianma Intelligent Control Technology Co. Ltd.Beijing 101300China

With the enhancement of environmental protection awareness of the international community and the continuous promotion of green and sustainable development of manufacturing industry,water lubrication instead of mineral oil has become the future development trend due to its green,pollution-free,clean,safe,and sustainable advantages especially in ships,marine,coal mining,and other *** recent years,with the rapid development of water lubrication research,significant progress has been made in related research knowledge domain and discipline.A systematic and extensive assessment of water lubrication research has become increasingly *** objective of this research is to reveal the research status,research hotspots,and development trends in the field of water ***,CiteSpace was used to conduct a systematic bibliometric and scientometrical analysis of 1,792 publications from Web of Science core collection database(1997–2021).The results show that China and USA are the most productive countries in the field of water lubrication and have made outstanding *** the analysis of hot key words and co-citation references,this paper reviews the research status of water lubrication in three aspects:(1)lubricating medium modification;(2)material preparation;(3)surface *** has become a research hotspot to promote the superlubricity contact interface and the application of *** results of this study can make a significant contribution to the development of water lubrication by providing a comprehensive understanding of the research status and research hotspots in this *** understanding and discussion of research hotspots and research status are expected to provide insights into future research *** addition,this study will provide valuable references and guidelines for researchers who are interested in this field.

关键词： water lubrication friction scientometrics CiteSpace

来源：

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

Amplification of high-order azimuthal mode based on a ring-core Yb-doped fiber

引用

Optoelectronics Letters 2022年第4期18卷 222-226页

作者： OU Nanxian LI Wei QIU runzhou ZHANG Bin GAO Shecheng liu Weiping Department of Electronic Engineering College of Information Science and TechnologyJinan UniversityGuangzhou 510632China Fiberhome Telecommunication Technologies Co. Ltd.Wuhan 430074China Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems and School of Electronics and Information Technology Sun Yat-sen UniversityGuangzhou 510275China

In order to increase the number of amplified azimuthal modes in Yb-doped fiber(YDF),a multiple azimuthal modes amplifier based on a ring-core Yb-doped fiber(RC-YDF)was proposed and demonstrated.A home-made RC-YDF which can support 6 azimuthal mode groups was employed to amplify the signal mode at 1064 nm,using a core pump *** amplification characteristics of 5 high-order azimuthal linear polarization(HA-LP)mode groups(LP_(11),LP_(21),LP_(31),LP_(41),LP_(51))were studied comprehensively.A more than 8 d B gain is obtained for each signal mode with 5 d Bm input power,and the associated differential modal gain between all modes is less than 1 d *** intensity profiles of all modes are stable and well preserved during the process of amplification.

关键词： mode order modal

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：