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Full-Annulus Simulation of the Surge Inception in a transonic Centrifugal Compressor

丛书名： Springer Handbooks

2007年

作者： Frank träger

来源：畅想之星图书光盘版（南... 评论

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畅想之星图书光盘版（南通市图书馆镜像）

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Journal of Thermal Science 2015年第5期24卷 442-451页

作者： I.trébinjac E.Benichou N.Buffaz Laboratoire de Mécanique des Fluides et d’Acoustique UMR CNRS 5509 Ecole Centrale de Lyon UCBLyon I INSA 36 av. Guy de Collongue 69134 Ecully Cedex France Turbomeca groupe Safran 64511 Bordes France

Full annulus simulations of the flow which develops in a transonic centrifugal compressor are performed at two stable operating points （peak efficiency and near surge） and during the path to surge. At stable conditions, the flow field properties are analyzed by comparisons with experimental data and numerical simulations using a phase lagged approach previously carried out. Regarding the stage overall performance, an excellent agreement is obtained between the numerical results （both with time lagged approach and full-annulus calculation） and the ex- periments. From the full-annnlus simulations, the change in flow pattern from peak efficiency to surge is found to be perfectly similar to that obtained from the simulations using the time lagged approach. In particular, pro- vided that the operating point is stable, the flow proves to be chorochronic. The full-annulus simulations were continued after a unique small change in the throttle law applied at the exit of the numerical domain. The mass flow, pressure ratio and efficiency then significantly drop all the more the time progresses. The simulation becomes unstable and the surge inception well underway. The path to surge is found to be due to the enlargement of the boundary layer separation on the suction side of the diffuser vanes in accordance with the conclusions drawn from the chorochronic simulations and experiments. But as the time progresses, the flow loses its chorochronic character. Stall cells rotating at around 7% of the rotor speed develop and lead to surge in around 5 revolutions.

关键词： centrifugal compressor surge transonic rotating stall full-annulus simulation URANS

西伯利亚发展的主要方向——以研究与规划相结合为基础

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西伯利亚研究 2024年第4期51卷 85-98页

作者： В.А.克留科夫钟建平俄罗斯科学院俄罗斯科学院西伯利亚分院经济与工业生产组织研究所黑龙江省社会科学院俄罗斯研究所

无论从课题研究角度还是从选题方向角度，西伯利亚经济社会发展顺利与否，过去和现在很大程度上都取决于其在解决国家发展问题中的角色和地位，以及国家参与构建良好生产生活环境制度体系的水平等关键因素。从历史看，经济社会进程的科... 详细信息

无论从课题研究角度还是从选题方向角度，西伯利亚经济社会发展顺利与否，过去和现在很大程度上都取决于其在解决国家发展问题中的角色和地位，以及国家参与构建良好生产生活环境制度体系的水平等关键因素。从历史看，经济社会进程的科学支持发挥了重要作用，这很大程度上与必须考虑不同的条件(自然条件以及历史文化条件)有关。经过几代人的努力，研究者和规划专家提出了形成俄罗斯东部地区经济社会长期发展轨迹的方法，这些方法提前多年确定了西伯利亚的经济社会发展方向。落实制定的发展方向时，应当把行业因素占主导列为主要问题。

关键词：西伯利亚经济社会发展联合地区生产综合体经济活动主体合作

Data-driven approaches for cyber defense of battery energy storage systems

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能源与人工智能(英文) 2021年第3期5卷 379-387页

作者： Nina Kharlamova Seyedmostafa Hashemi chresten træholt Technical University of Denmark CopenhagenDenmark

Battery energy storage system(BESS)is an important component of a modern power system since it allows seamless integration of renewable energy sources(RES)into the grid.A BESS is vulnerable to various cyber threats that may influence its proper operation,which in turn impacts negatively the BESS and the electric *** potential failure of a BESS can cause economic issues and physical damage to its *** ensure cyber-secure and reliable BESS operation in grid-connected or islanded modes of the BESS operation,a cyber-defense strategy is ***,a comprehensive review on the requirements for the BESS design as well as the attack detection and mitigation methods is *** this paper,we review state-of-the-art attack detection and mitigation methods for various BESS applications focusing on machine learning(ML)and artificial intelligence(AI)-based *** addition,the state-of-the-art methods for designing and operating a cyber-secure BESS are *** on the literature review,we identified gaps in the current research,defined the possible cyberattacks against the BESS that have not been considered before,and suggested the potential approaches to detect them.

关键词： Cyber security Artificial intelligence Battery energy storage system False data injection attack Cyberattack Machine learning

Clinicopathologic study of primary intestinal B cell malignantlymphoma

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World Journal of Gastroenterology 1999年第6期5卷 538-540页

作者： Zhou Q Xu tr Fan QH Zhen ZX Nanjing Med Univ Affiliated Hosp 1 Dept Pathol Nanjing 210029 Jiangsu Prov Peoples R China

INtrODUCTIONPrimary intestinal B cell lymphoma is one of the most common extra-nodal lymphomas, which includes two types: intestinal mucosa-associated lymphoid tissue lymphoma (IMALToma) and lymphomatous polyposis (LP). Both have characteristic pathologic features, immunophen-otypes and biological behaviors. In this article, twenty-five cases were retrospectively analyzed with regard to criteria of diagnosis and clinicopathologic characteristics.

关键词： lymphoma/pathology intestinal neoplasms/pathology intestinal neoplasms/diagnosis

Laser Measurements in High Speed Compressors for Rotor-Stator Interaction Analysis

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Journal of Thermal Science 2003年第4期12卷 310-317,309页

作者： Xavier Ottavy Isabelle trébinjac André Vouillarmet David Arnaud Laboratoire de Mecanique des Fluides et d'Acoustique UMR CNRS 5509/ECL/UCB Lyon I Ecole Centrale de Lyon 36 Avenue Guy de Collongue 69134 ECULLY Cedex France

This paper deals with the experimental quantification of the unsteady effects of the interactions between rotor and stator rows in high speed compressors. Due to the fact that the levels of the periodic fluctuations arising from the unsteady interaction may be low compared with the random fluctuations arising from the measurement uncertainties, it is crucial to minimize the errors inherent to the used technique. The first part of the paper concentrates on technical details relative to the experimental process. The second part is devoted to the data post-processing. Two tools for analysing the rotor-stator interactions are presented. The first tool is based on a decomposition of the flow field which was initially introduced to solve numerical problems when attempting to calculate the flow field in a multi-row configuration. The second tool is based on a spectral analysis of the signal, that qualifies the interaction in a sense of circumferential spinning lobes. Experimental results obtained within both an axial and a centrifugal high speed compressors are used to illustrate the data processing. In both cases, the effects of the unsteady interaction are quantified.

关键词： laser anemometry high speed compressor rotor-stator interaction.

Temporal Behaviour of a Corner Separation in a Radial Vaned Diffuser of a Centrifugal Compressor Operating near Surge

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Journal of Thermal Science 2013年第6期22卷 555-564页

作者： A.Marsan I.trébinjac S.Coste G.Leroy Laboratoire de Mécanique des Fluides et d'Acoustique UMR CNRS 5509 cole Centrale de Lyon Turbomeca Safran group

The temporal behaviour of a flow separation in the hub-suction side comer of a transonic diffuser is studied thanks to unsteady numerical simulations based on the phase-lagged approach. The validity of the numerical re- sults is confn＇med by comparison with experimental unsteady pressure measurements. An analysis of the instan- taneous skin-friction pattern and particles trajectories is presented. It highlights the topology of the separation and its temporal behaviour. The major result is that, despite of a highly time-dependent core flow, the separation is found to be a ＂fixed unsteady separation＂ characterized by a fixed location of the main saddle of the separation but an extent of the stall region modulated by the pressure waves induced by the impeller-diffuser interaction.

关键词： Corner Separation Radial Vaned Diffuser Centrifugal Compressor Surge

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俄乌战争的文明冲突性质及其前景

西伯利亚研究 2024年第3期51卷 90-107页

作者： [俄]П.Я.齐特基洛夫李振文(译) 俄罗斯南联邦大学哲学与社会政治学院复旦大学历史学系

当前,西方正在乌克兰领土上开展针对俄罗斯的混合战。这种对抗具有文明冲突的性质,冲突的双方一一俄罗斯和美国分别是欧亚一全罗斯文明和西方文明的核心国家。俄罗斯虽然希望在与西方的文明冲突中获胜,希望建立一个社会公平、对俄友好... 详细信息

当前,西方正在乌克兰领土上开展针对俄罗斯的混合战。这种对抗具有文明冲突的性质,冲突的双方一一俄罗斯和美国分别是欧亚一全罗斯文明和西方文明的核心国家。俄罗斯虽然希望在与西方的文明冲突中获胜,希望建立一个社会公平、对俄友好的乌克兰,但是如果俄罗斯本身不进行必要的系统性变革,这种目标就难以实现。只有在真正维护国家主权的基础上,将社会体制转变为改良的社会主义,激发出最重要的社会领域的活力,才是俄罗斯国家系统性变革的应有之义。本文原名《俄罗斯与西方在乌克兰的文明冲突》,发表在《自由思想》2022年第6期①,经作者同意并补充修改后,在《西伯利亚研究》以中文刊发。

关键词：俄乌战争文明冲突混合战西方系统性变革

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点亮童年 NEMO儿童乐园

室内设计与装修 2024年第7期 72-75页

作者：无 minh Anh(摄影) 沙漏(编译) MAD.e studio 不详

NEMO儿童乐园设计的总体理念是“平行宇宙”。设计师因此而在设计中实施了各种想法和小型计划,此外,将来如果这一区域开放扩建,投资者期望增加新的单元,这一理念也可以应对后续的一切变化。儿童乐园占地510m2,设计师根据儿童的年龄和发... 详细信息

NEMO儿童乐园设计的总体理念是“平行宇宙”。设计师因此而在设计中实施了各种想法和小型计划,此外,将来如果这一区域开放扩建,投资者期望增加新的单元,这一理念也可以应对后续的一切变化。儿童乐园占地510m2,设计师根据儿童的年龄和发展阶段,把空间划分为若干不同的功能区。

关键词：儿童乐园平行宇宙空间划分功能区 NEMO 点亮设计师

基于昆虫肠道纤维素降解菌领域的文献计量分析

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微生物学通报 2024年

作者：刘琦 Vuong Thi minh Dien 王新茹王华玲曾健勇李会平河北农业大学林学院河北农业大学实验实训中心河北省城市森林健康技术创新中心河北省林木种质资源与森林保护重点实验室

【背景】近年来，昆虫肠道纤维素降解菌领域逐渐引起了学者们的关注。尽管相关科研著作逐年增加，但目前仍然缺乏对现有文献的系统梳理和可视化分析。【目的】探究昆虫肠道纤维素降解菌领域的研究现状与发展方向，为后续该领域的研究提... 详细信息

【背景】近年来，昆虫肠道纤维素降解菌领域逐渐引起了学者们的关注。尽管相关科研著作逐年增加，但目前仍然缺乏对现有文献的系统梳理和可视化分析。【目的】探究昆虫肠道纤维素降解菌领域的研究现状与发展方向，为后续该领域的研究提供科学基础。【方法】本研究以1995-2023年在Web of Science核心合集（WOS）中193篇论文信息，对昆虫肠道纤维素降解菌研究领域的发文量、关键词、宿主昆虫、研究方法、纤维素降解菌等进行文献计量学分析。【结果】研究结果表明，昆虫肠道纤维素降解菌年发文量总体呈现增长趋势。收录文献最多的期刊是Frontiers in Microbiology，Microbial Ecology总被引频次与篇均被引次数皆为最高。中国发文量位居第二，但篇均被引频次远低于日本、英格兰以及德国等六个国家。统计到49种宿主昆虫，以农林害虫为主，占比77.97%，其次白蚁等财产害虫，占11.86%，其中鞘翅目受到多年持续关注。统计到昆虫肠道纤维素降解菌135种，涉及芽孢杆菌属（Bacillus）、假单胞菌属（Pseudomonas）、克雷伯氏菌属（Klebsiella）等63个细菌属，枝孢菌属（Cladosporium）、胶头霉属（Gliocephalotrichum）、青霉菌属（Penicillium）等14个真菌属。羧甲基纤维素是最多的供试纤维素，刚果红水解圈法是最常见的纤维素降解功能验证方法。传统分离培养技术在此领域一直发挥关键作用，近年来也在不断引入16S rRNA基因测序等技术进行多样性和分子机制研究。【结论】本研究对昆虫肠道纤维素降解菌领域现有文献进行了计量分析，有助于加深对本领域的整体认识，为后续研究开展提供基础依据。

关键词：昆虫肠道微生物纤维素降解文献计量学 CiteSpace VOSviewer