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含3×3花瓣形燃料棒组件的自然循环系统多尺度耦合模拟研究

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工程热物理学报 2024年第1期45卷 32-39页

作者：蔡伟华李智明崔军张文超金光远孙建闯东北电力大学热流科学与核工程实验室吉林132012 中广核研究院有限公司深圳518031

花瓣形燃料棒组件由于其优良的传热性能受到国内外广泛关注。为获得花瓣形燃料棒组件在自然循环条件下的流动特性,本文对含3×3花瓣形燃料棒组件的自然循环系统开展了多尺度耦合模拟研究。基于一维用户程序和STAR-CCM+构建自然循环系统... 详细信息

花瓣形燃料棒组件由于其优良的传热性能受到国内外广泛关注。为获得花瓣形燃料棒组件在自然循环条件下的流动特性,本文对含3×3花瓣形燃料棒组件的自然循环系统开展了多尺度耦合模拟研究。基于一维用户程序和STAR-CCM+构建自然循环系统的一维和三维耦合数值模型,并结合实验结果进行了模型验证。重点分析了加热功率和高差对自然循环能力、花瓣形燃料棒组件阻力系数的影响。结果表明,系统排热功率与冷热源高差满足幂函数分布形式。通过引入黏度修正因子和结构影响因子,获得花瓣形燃料组件在宽Re数范围,不同螺距、加热和冷态条件下的阻力系数关联式的通用表达式形式,并基于模拟和公开实验数据验证了其可靠性。

关键词：自然循环系统花瓣形棒束组件自然循环能力多尺度耦合模拟阻力系数

Distribution performance of gas–liquid mixture in the shell side of spiral-wound heat exchangers

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Chinese Journal of Chemical Engineering 2019年第10期27卷 2284-2292页

作者： Wenke Zheng weihua cai Yiqiang Jiang School of Architecture Harbin Institute of TechnologyHarbin 150090China Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology Ministry of Industry and Information TechnologyHarbin 150090China School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of Energy and Power Engineering Northeast Electric Power UniversityJilin 132012China

The non-uniformity of gas–liquid mixture is a critical issue which leads to the heat transfer deterioration of spiralwound heat exchangers(SWHEs).Two-phase mass flow rate and the content of gas are important parameters as well as structural parameters which have prominent influences on flow distribution uniformity of SWHE shell *** order to investigate the influences of these parameters,an experimental test system was built using water and air as mediums and a novel distributor named"tubes distributor"was *** effects of mass flow rate and the content of gas on two-phase distribution performance were analyzed,where the mass flow rate ranged from 28.4 to 171.9 kg·h-1 and the content of gas changed from 0.2 to 0.8,*** results showed that the mixture mass flow rate considerably influenced the liquid distribution than that of gas phase and the larger mass flow rate exhibited the better distribution uniformity of two-phase *** was also found that the tubes distributor had the better two-phase uniformity when the content of gas was around *** diameter played an important role in the distribution of gas phase and slit width was more significant for the uniformity of liquid phase.

关键词： Spiral-wound heat exchanger Gas–liquid mixture Multiphase flow Distribution uniformity

Enzyme-loaded liposome with biocatalytic precipitation for potentiometric immunoassay of thyroid-stimulating hormone in thyroid carcinoma

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Chinese Chemical Letters 2020年第2期31卷 463-467页

作者： Yongjin Cao Min Zheng weihua cai Zongcai Wang Department of Thyroid and Breast Surgery The First Affiliated Hospital of Fujian Medical UniversityFuzhou 350005China Department of Medical Oncology The First Affiliated Hospital of Fujian Medical UniversityFuzhou 350005China

A simple and feasible potentiometric immunosensing platform based on enzymatic biocatalytic precipitation technique was designed for the sensitive detection of thyroid-stimulating hormone(TSH;a typical kind of biomarkers for thyroid carcinoma),using horseradish peroxidase(HRP)-loaded liposome for the signal *** construct such an assay system,a sandwich-type immunoreaction was readily carried out on monoclonal anti-TSH capture antibody-coated electrode by using polyclonal antiTSH secondary antibody-conjugated HRP-loaded *** the formation of sandwichtype immunocomplex,the carried liposome was lysed through the added Triton X-100 to release the entrapped HRP molecules,which catalyzed the oxidation of 4-chloro-1-naphthol to produce an insoluble and uncharged organic precipitation on the electrode surface,thereby causing the change of the local electrical *** labeling protocols with and without the liposome were investigated for detection of target TSH,improved analytical features were achieved with HRP-entrapped *** optimal conditions,the potentiometric immunosensor had good responses for TSH detection within the linear range of 0.01-30 p IU/mL at a detection limit of 0.0067 p IU/*** reproducibility,high specificity and long-time stability were acquired during the assay ***,a wellmatched accuracy between the potentiometric immunosensor and commercial human TSH ELISA kit was gave for the analysis of human serum samples.

关键词： Potentiometer Modification electrode Potentiometric immunoassay Thyroid-stimulating hormone Enzyme-encapsulated liposome Enzyme biocatalytic precipitation

3×3花瓣形燃料棒-冷却剂耦合作用下子通道内过冷流动沸腾特性数值研究

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核动力工程 2024年第4期45卷 87-95页

作者：杜利鹏宋尚典蔡伟华蒋泽平程琦张文超金光远东北电力大学能源与动力工程学院热流科学与核工程实验室吉林吉林132012 国网吉林省电力有限公司电力科学研究院长春130012

为推动花瓣形燃料棒在水冷堆中的工程应用,必须了解冷却剂在花瓣形燃料棒束子通道内过冷流动沸腾特性。为此,本研究采用欧拉两流体模型和壁面沸腾模型,开展了3×3花瓣形燃料棒-冷却剂耦合作用下过冷流动沸腾数值研究。利用模拟结果探究... 详细信息

为推动花瓣形燃料棒在水冷堆中的工程应用,必须了解冷却剂在花瓣形燃料棒束子通道内过冷流动沸腾特性。为此,本研究采用欧拉两流体模型和壁面沸腾模型,开展了3×3花瓣形燃料棒-冷却剂耦合作用下过冷流动沸腾数值研究。利用模拟结果探究不同子通道内空泡份额、壁面温度、横向流速等参数分布,以及均匀加热方式与轴向余弦加热方式对流动与换热的影响。结果表明,角燃料棒上最先出现过冷沸腾,随着加热功率增加,角、边、中心燃料棒上的过冷沸腾起始点(ONB)位置不均匀性减小;在相同加热条件下,角燃料棒上ONB处壁面过热度最大,其次是边燃料棒,中心燃料棒最小;燃料棒内凹弧处表面热流密度大于外凸弧处。总加热量一定的条件下,余弦加热和均匀加热相比,其壁面分布不均匀性降低。

关键词：小型反应堆花瓣形燃料棒过冷沸腾过冷沸腾起始点(ONB)

Analysis of coherent structures in drag-reducing polymer solution flow based on proper orthogonal decomposition

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Science China(Physics,Mechanics & Astronomy) 2012年第5期55卷 854-860页

作者： cai weihua LI FengChen ZHANG HongNa WANG Yue WANG Lu School of Energy Science and Engineering Harbin Institute of Technology Harbin 150001 China School of Civil Engineering Harbin Institute of Technology Harbin 150090 China School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China

Direct numerical simulation(DNS) of forcing homogeneous isotropic turbulence with polymers was *** order to understand the polymers effect on turbulent coherent structures,proper orthogonal decomposition was performed to identify coherent structures based on DNS data,so as to analyze the remarkable difference due to the addition of *** results showed that the numbers for eigenmodes required for capturing coherent structures were 32 and 24 for the Newtonian fluid and polymer solution flows,respectively,which means the decrease of the complexity in polymer solution *** the POD energy spectrum,it was found that the turbulent kinetic energy is distributed onto a large number of eigenmodes whether in the Newtonian fluid flow or polymer solution flow,suggesting that polymer solution flow is still turbulent in one ***,the POD eigenmodes were investigated,which found that the small-scale structures are inhibited in polymer solution flow.

关键词： coherent structures polymer drag reduction isotropic turbulence proper orthogonal decomposition

Preparation of modified LiMn_(2)O_(4) by solid-state reaction

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Rare Metals 2006年第z1期25卷 71-76页

作者： LU Shigang cai Zhenping JIN weihua LI Mingxun HUANG Songtao Division of Mineral Resources Metallurgy&MaterialsGeneral Research Institute for Nonferrous MetalsBeijing 100088China

Modified lithium manganese oxides were prepared by solid-state reaction of LiMn_(2)O_(4)and LiCoO_(2)as raw materials.A study was carried out by TG-DSC,XRD,DSC and electrochemical to analyse the reaction process and structural characterization of *** results show that the LiMn_(2)O_(4)reacts chemically with LiCoO_(2)at high *** of Li and partial Co atoms can insert into the LiMn_(2)O_(4)crystal lattice and a newly formed spinel phase-modified LiMn_(2)O_(4)was *** distribution of Co content is even in modified LiMn_(2)O_(4)*** modified LiMn_(2)O_(4)compound exhibits improved cycling stability at room and elevated temperature in comparison with the pure LiMn_(2)O_(4).

关键词： lithium-ion battery spinel LiMn_(2)O_(4) modification process

tRNA衍生片段(tRFs)调节基因表达的机制及其在相关疾病中的研究进展

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南通大学学报（医学版） 2024年第1期44卷 63-67页

作者：赵江华蔡卫华陈琳居林玲南通大学附属南通第三医院肝胆外科江苏226006 南通大学附属南通第三医院肝病研究所江苏226006

转运RNA(transfer RNA,tRNA)衍生片段(tRNA-derived fragments,tRFs)是一类新的调节性非编码RNA,在应激诱导的疾病和癌症中具有独特的生物学功能。细胞必须合成新的蛋白质来维持其寿命,而tRNAs是蛋白质翻译过程的重要组成部分。成熟tRNA... 详细信息

转运RNA(transfer RNA,tRNA)衍生片段(tRNA-derived fragments,tRFs)是一类新的调节性非编码RNA,在应激诱导的疾病和癌症中具有独特的生物学功能。细胞必须合成新的蛋白质来维持其寿命,而tRNAs是蛋白质翻译过程的重要组成部分。成熟tRNAs和前体tRNAs根据不同的酶切位点被裂解为两种类型:tRNA半体(tiRNAs,长度为28~36 nt)和tRFs(长度为14~30 nt)。前者包含2个亚类:5′-tiRNAs和3′-tiRNAs,后者分为5个亚类:tRF-1、tRF-2、tRF-3、tRF-5和i-tRF。tRFs通过与其他类型的RNA或蛋白质相互作用来调节基因的表达,并在多种疾病中异常表达,如在神经退行性病变、病毒感染等多种疾病中发挥重要作用,且在胃癌、肝癌等多种癌症中异常表达。本文就tRFs在人类疾病中的研究进展进行综述。

关键词： tRNA衍生片段转运RNA 疾病

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Investigation on reversible pump turbine flow structures and associated pressure field characteristics under different guide vane openings

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Science China(Technological Sciences) 2019年第11期62卷 2052-2074页

作者： BINAMA Maxime SU WenTao cai weihua LI FengChen WEI XianZhu MUHIRWA Alex GONG RuZhi WEKESA David W School of Energy Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of Energy and Power Shenyang Institute of Engineering Shenyang 110136China School of Energy and Power Engineering Northeast Electric Power UniversityJilin 132012China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China State Key Laboratory of Hydropower Equipment Harbin Institute of Large Electric MachineryHarbin 150040China

The use of reversible pump turbines(RPT) within pumped storage power plants goes with prolonged periods of off-design operating conditions, which leads to the onset of operating mode-dependent instabilities. In order to decrease the gravity of RPT flow instabilities and associated damages or even completely eliminate them, a deep understanding of its onset and development mechanism is needed. In line with this, the present study seeks to numerically investigate the onset and development mechanism of RPT unsteady flow structures as well as the evolutional characteristics of associated pressure pulsations throughout the RPT complete flow passage, under off-design conditions for three GVOs namely 17, 21, and 25 mm. The study results showed that low torque operating conditions and associated vaneless space back flow structures were the trigger of flow unsteadiness onset within the RPT vaneless space, the instabilities which grew to cause the S-shape characteristics appearance. Moreover, the runner flow unsteadiness was found to decrease with the GVO increase. On the other hand, the GVO increase worsened the pressure pulsation levels within RPT flow zones, where pressure pulsations within the vaneless space and flow zones in its vicinities were found to be the most sensitive to GVO changes.

关键词： reversible pump-turbine flow unsteadiness pressure pulsation guide vane opening numerical simulation

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LTE网络节能降耗研究及应用

长江信息通信 2024年第6期37卷 207-210页

作者：王君李荣华蔡伟华肖驰李雅中国联合网络通信有限公司娄底市分公司湖南娄底417000 湘潭理工学院湖南湘潭411104 河海大学江苏南京210000

基于现网4/5G网络业务承载的情况,研究LTE网络节能降耗策略,在不牺牲用户体验的情况下,探索一套适宜现网场景的节能策略,降低能耗支出,提升网络运行效能。

关键词：智能关断符号关断 PRB RF

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