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

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

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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

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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

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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

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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.

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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

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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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A review of Danish integrated multi-energy system flexibility options for high wind power penetration

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Clean Energy 2017年第1期1卷 23-35页

作者： Jiawei Wang Yi Zong Shi You Chresten træholt Center for Electric Power and Energy CEEDepartment of Electrical EngineeringTechnical University of DenmarkCopenhagenDenmark

The current status of wind power and the energy infrastructure in Denmark is reviewed in this *** reasons for why Denmark is a world leader in wind power are *** Danish government is aiming to achieve 100%renewable energy generation by 2050.A major challenge is balancing load and *** addition,the current and future solutions of enhancing wind power penetration through optimal use of cross-energy sector flexibility,so-called indirect electric energy storage options,are investigated.A conclusion is drawn with a summary of experiences and lessons learned in Denmark related to wind power development.

关键词： energy system flexibility high wind power penetration integrated multi-energy system Danish wind energy

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Doppler Global Velocimeter-Development and Validation with Measurements in a Round Free Jet

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Journal of Thermal Science 2009年第1期18卷 74-84页

作者： X.Ottavy S.Goguey J.Berthiau I.trébinjac Laboratoire de Mécanique des Fluides et d’Acoustique(LMFA)

Doppler global velocimetry （DGV） has already been shown to be an interesting technique capable of measuring the three components of velocity in a plane. A 1-component DGV system is currently under development at the LMFA, using a stabilized continuous wave （CW） argon ion laser for ermssion, lne receiver Ieatures only one camera for both signal and reference images and incorporates a DEF1 system to adjust the incident laser light frequency and its transmission coefficient on the iodine cell absorption line. A description of the whole system is presented and a validation with measurements of axial velocities at several positions in a round free jet is proposed.

关键词： laser anemometry Doppler shift iodine vapor absorption line filter DEFI system image processing.

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Semantic representation of proved and disproved statements extracted from scientific papers: Meat science case study

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Information Processing in Agriculture 2014年第1期1卷 66-72页

作者： Piotr Kulicki Robert trypuz Rafałtrójczak Jerzy Wierzbicki Alicja Wozniak The John Paul II Catholic University of Lublin Al.Racławickie 1420-950 LublinPoland Polish Beef Association ul.Kruczkowskiego 300-380 WarszawaPoland

The article presents an ontology called“Science”designed for representing proved and disproved statements extracted from scientific papers from the database of the ProOptiBeef *** argue that the proved and disproved statements are the best characterization of the content of the papers they are extracted *** show that ontological representation of proved and disproved statements not only facilitates the access to the content of the papers and increases the precision of a semantical search,but also allows for an automatic generation of new statements from the ones already coded in the ontology.

关键词： Ontology Scientific law Livestock Beef

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