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Multi-Fidelity Simulation of Gas Turbine Overall Performance by Directly Coupling High-Fidelity Models of Multiple Rotating Components

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Journal of Thermal Science 2024年第4期33卷 1357-1378页

作者： DENG weimin XU Yibing NI Ming WEI Zuojun gan Xiaohua REN Guangming Department of Mechanics and Aerospace Engineering Southern University of Science and TechnologyShenzhen518055China School of Aerospace Engineering Tsinghua UniversityBeijing100084China Shenzhen Key Laboratory of Wide-Speed-Range and Variable-Density Continuous Wind Tunnel Shenzhen Science and Technology Innovation CommitteeShenzhen518000China

Multi-fidelity simulations incorporate computational fluid dynamics(CFD) models into a thermodynamic model,enabling the simulation of the overall performance of an entire gas turbine with high-fidelity *** iterative coupled methods rely on characteristic maps,while fully coupled methods directly incorporate high-fidelity ***,fully coupled methods face challenges in simulating rotating components,including weak convergence and complex *** address these challenges,a fully coupled method with logarithmic transformations was developed to directly integrate high-fidelity CFD models of multiple rotating *** developed fully coupled method was then applied to evaluate the overall performance of a KJ66 micro gas turbine across various off-design *** developed fully coupled method was also compared with the traditional iterative coupled ***,experimental data from ground tests were conducted to verify its *** convergence history indicated that the proposed fully coupled method exhibited stable convergence,even under far-off-design *** experimental verification demonstrated that the multi-fidelity simulation with the fully coupled method achieved high accuracy in off-design *** analysis revealed inherent differences in the coupling methods of CFD models between the developed fully coupled and traditional iterative coupled *** inherent differences provide valuable insights for reducing errors between the component-level model and CFD models in different coupling *** developed fully coupled method,introducing logarithmic transformations,offers more realistic support for the detailed and optimal design of high-fidelity rotating components within the overall performance platform of gas turbines.

关键词： multi-fidelity fully coupled method iterative coupled method gas turbine component-level model

Atomically dispersed materials:Ideal catalysts in atomic era

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Nano Research 2024年第1期17卷 18-38页

作者： Tao gan Dingsheng Wang Department of Chemistry Tsinghua UniversityBeijing 100084China

Catalysts can accelerate the chemical reaction rate and effectively promote the molecules transformation,which is of great significance in the research of chemical industry and material *** extreme utilization of reactive sites has led to the emergence and development of atomically dispersed materials(ADMs).The highly active coordination unsaturated metal sites and fully utilized metal atoms make ADMs show great potential in catalytic *** adjustment of coordination environment and electronic structure provides more possibilities for constructing reactive centers with different *** review summarized the application and research progress of ADMs in different *** design strategy and structure–activity relationship of ADMs for specific reactions were summarized and ***,we also provided advices for the challenges and opportunities faced by ADMs in catalytic reactions.

关键词： atomically dispersed materials catalysis organic synthesis battery sensor enzyme

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低掺量石墨水泥基材料的压敏特性

北京航空航天大学学报 2011年第5期37卷 556-559,578页

作者：甘伟民黄新陈鹏飞北京航空航天大学交通科学与工程学院北京100191

通过减水剂将少量石墨加入水泥基材料中制成石墨水泥基材料试样,采用交流分压电路测量其电阻率,研究其在一次性加载破坏试验中的压敏特性.试验结果表明,低掺量石墨粉作为导电组份加入水泥基材料后会导致其强度降低,但可以使水泥基材料... 详细信息

通过减水剂将少量石墨加入水泥基材料中制成石墨水泥基材料试样,采用交流分压电路测量其电阻率,研究其在一次性加载破坏试验中的压敏特性.试验结果表明,低掺量石墨粉作为导电组份加入水泥基材料后会导致其强度降低,但可以使水泥基材料具有一定程度的压敏特性.随着石墨掺量的增加,各组试样电阻率的离散性变小,材料的压敏特性提高,在加载过程电阻率的波动变小.在本试验的测量方法下得到的石墨水泥基材料的压敏特性曲线与混凝土材料的应力应变曲线有相关性,试样的电阻率随着应力的增大而产生变化的过程大体可分为3个阶段,即波动阶段、稳定下降阶段和急剧下降阶段,分别对应混凝土材料应力应变关系的弹性变化、非弹性变化和应变迅速增大阶段.

关键词：石墨水泥相对电阻率压敏性

Development and characterization of urethral stricture model in rabbits

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Journal of Medical Colleges of PLA(China) 2010年第6期25卷 351-358页

作者： Fu Delai Wang Ziming Chong Tie Li Hecheng Zhang Huibo Zhang Peng gan weimin Department of Urology Second Affiliated Hospital School of Medicine Xi 'an Jiaotong University Xi 'an 710004 China Department of Urology Affiliated Hospital of Shaanxi Traditional Chinese Medical College Xianyang 712000 China

Objective： To establish an experimental model of urethral stricture in rabbits. Methods： A total of 21 adult male New Zealand rabbits were included into group. After intravenous anesthesia, urethroscopy was performed with a pediatric resectoscope （F13）. Fifteen animals were randomly selected as the study group. A lcm-long circumferential electrocoagulation of the bulbar urethra was performed to these animals until ulceration of the mucosa. The remaining 6 animals underwent video urethroscopy without electrocoagulation, serving as controls. On the 30th day, retrograde urethrogram and urethroscopy were performed to evaluate urethral stricture formation, histological examinations （HE and Sirius Red staining） were done to assess urethral pathological change. Results： Two rabbits in study group died and no death occurred in controls. Based on urethrogram and urethroscopy, no rabbits in control group developed urethral stricture, while significant stricture formation was observed in every case of the study group. Histological examination showed a normal urethra in control cases, while at stricture site of the study group extensive fibrosis of muscle and submucous tis High collagen expression in fibrosis tissue was assayed sue by was observed with a large number of fibroblasts infiltration Sirius Red staining. Conclusion： A lcm-long endoscopic electrocoagulation can successfully induce urethral stricture formation in rabbit models. This method offers an ideal animal model for the fundamental and clinical study of urethral stricture

关键词： Urethral stricture Animal model Rabbits

Progress Report on ASO-S: 2022–2024

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空间科学学报 2024年第4期44卷 687-689页

作者： gan Weiqun Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of SciencesNanjing 210023

The Advanced Space-based Solar Observatory(ASO-S)marked China's first comprehensive solar mission in *** upon the previous reports covering 2018-2020 and 2020-2022,we present here an update on the ASO-S made from 2022 to *** August 2022,ASO-S completed its Phase D study and was successfully launched on October 9,*** commissioning phase was carried out and concluded within the first nine months following the *** data and associated analysis software have been opened to the community and the research on the early ASO-S data has been well *** anticipate also the achievements in data research pertaining to ASO-S in the near future.

关键词： Space astronomy Solar physics Spacecraft

Distributed Least Squares Algorithm of Continuous-Time Stochastic Regression Model Based on Sampled Data

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Journal of Systems Science & Complexity 2024年第2期37卷 609-628页

作者： ZHU Xinghua gan Die LIU Zhixin The Key Laboratory of Systems and Control Academy of Mathematics and Systems ScienceChinese Academy of Sciencesand School of Mathematical SciencesUniversity of Chinese Academy of SciencesBeijing 100190China Zhongguancun Laboratory Beijing 100094China

In this paper,the authors consider the distributed adaptive identification problem over sensor networks using sampled data,where the dynamics of each sensor is described by a stochastic differential *** minimizing a local objective function at sampling time instants,the authors propose an online distributed least squares algorithm based on sampled data.A cooperative non-persistent excitation condition is introduced,under which the convergence results of the proposed algorithm are established by properly choosing the sampling time *** upper bound on the accumulative regret of the adaptive predictor can also be ***,the authors demonstrate the cooperative effect of multiple sensors in the estimation of unknown parameters by computer simulations.

关键词： Cooperative excitation condition distributed least squares regret sampled data stochastic differential equation

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D60钨钢电化学机械复合抛光试验研究

制造技术与机床 2009年第9期 76-78页

作者：徐波干为民南京农业大学工学院江苏南京210031 常州市特种加工重点实验室(常州工学院) 江苏常州213002

为了解决高硬度高耐磨性冲压模材料日本富士D60钨钢的抛光难题,研究了D60钨钢电化学机械复合抛光工艺。在研制了电化学机械复合抛光试验机的基础上,通过对加工间隙、电解液温度、电解液浓度、加工时间等试验参数的正交试验及单因数试验... 详细信息

为了解决高硬度高耐磨性冲压模材料日本富士D60钨钢的抛光难题,研究了D60钨钢电化学机械复合抛光工艺。在研制了电化学机械复合抛光试验机的基础上,通过对加工间隙、电解液温度、电解液浓度、加工时间等试验参数的正交试验及单因数试验的研究,找到了比较优化的抛光工艺参数。试验表明:在20min内,能将D60钨钢表面粗糙度从Ra1·51μm降到Ra0·2μm左右。

关键词： D60钨钢电化学机械复合抛光粗糙度

基于UG软件直纹面整体叶轮的数控电解机械复合加工方法研究

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制造技术与机床 2013年第1期 62-65页

作者：徐波干为民常州工学院江苏省数字化电化学加工重点建设实验室江苏常州213002

利用UG软件生成数控轨迹,只需一次走刀即可实现对一不锈钢整体直纹面叶轮的开粗加工,足见其效率之高。

关键词： UG软件直纹面整体叶轮数控电解机械复合加工

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旋转编码器安装至零位调整装置研制

制造技术与机床 2012年第8期 146-148页

作者：丁仕燕干为民江苏省数字化电化学加工重点建设实验室江苏常州213002 常州工学院机电学院江苏常州213002

为了使旋转编码器安装时在零位,设计了零位调整装置。该装置包括:斜齿轮、蜗杆和磁力表座组件。斜齿轮安装在旋转编码器的空心转轴上;磁力表座组件依靠磁铁吸力固定在自动化设备上,蜗杆安装在轴套中,该轴套被夹在磁力表座组件的弹性孔... 详细信息

为了使旋转编码器安装时在零位,设计了零位调整装置。该装置包括:斜齿轮、蜗杆和磁力表座组件。斜齿轮安装在旋转编码器的空心转轴上;磁力表座组件依靠磁铁吸力固定在自动化设备上,蜗杆安装在轴套中,该轴套被夹在磁力表座组件的弹性孔夹头中。蜗杆发生转动时驱动斜齿轮,进而驱动旋转编码器空心转轴,同时计算机软件读取旋转编码器输出信号以判断其是否到达零位,如在零位,则停止转动蜗杆。实验结果表明:使用该装置可方便、快捷地把旋转编码器安装在零位。

关键词：旋转编码器零位调整装置