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Enhanced quasi-three-dimensional transient simulation technique incorporating component volume effects for aero engine

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Chinese Journal of Aeronautics 2024年第12期37卷 325-346页

作者： yuchen dai Manxiang SONG Donghai JIN Xingmin GUI Aeroengine Simulation Research Center School of Energy and Power EngineeringBeihang UniversityBeijing 100191China Jiangxi Research Institute of Beihang University Nanchang 330096China

Current transient analysis predominantly relies on zero-dimensional/one-dimensional tools,proficient at capturing aerothermodynamic variations across critical engine stations but insufficient for analyzing the internal flow field evolution during *** this gap,the study presents an enhanced quasi-three dimensional(quasi-3D)transient simulation technique that integrates component volume effects,offering a significant leap from the preceding quasi-3D transient simulation method based on quasi-steady *** embedding the component volume effects on density,momentum,and energy within the physical temporal dimension of the Navier-Stokes equations,the refined quasi-3D transient model achieves a closer representation of physical *** against a single-shaft turbofan engine’s experimental data confirms the model’s *** errors for key performance indicators,including shaft speed,thrust,mass flow rate,and critical component exit temperature and pressure,remain below 0.41%,5.69%,2.55%,3.18%and 0.67%,***,the model exposes a discernible temporal lag in the compressor outlet pressure and temperature response due to volume effects—previously unquantified in quasi-3D transient *** further exploration of the meridional flow field emphasizes the consequential role of volumes in transient flow field *** volume effects within quasi-3D transient simulations enhances engine modeling and is pivotal for precise transient analysis in engine design and optimization.

关键词： Engines Transient simulation Quasi-3D modeling Component volume effects Flow field evolution Transient performance analysis

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Mother or Lover, That's the Questio

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China Today 2010年第2期59卷 16-17页

作者： dai yuchen 不详

WHEN word spread about a Leonids shower in mid November 2009,there was a flurry of excitement among young Chinese,astronomy fans or *** event appears once every 33.5 years,meaning a mortal can watch three of them in a lifetime at *** a rarer occurrence is now on the way-the Chinese New Year and Valentine's Day fall on the same day in 2010,a happenstance of once in 38 years.

关键词： s the Question Mother or Lover,That

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Giant excitonic upconverted emission from two-dimensional semiconductor in doubly resonant plasmonic nanocavity

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Light(Science & Applications) 2022年第7期11卷 1523-1534页

作者： Pengfei Qi yuchen dai Yang Luo Guangyi Tao Liheng Zheng Donglin Liu Tianhao Zhang Jiadong Zhou Bo Shen Feng Lin Zheng Liu Zheyu Fang School of Physics State Key Laboratory for Mesoscopic PhysicsAcademy for Advanced Interdisciplinary StudiesCollaborative Innovation Center of Quantum MatterNano-optoelectronics Frontier Center of Ministry of EducationPeking UniversityBeijing 100871China Institute of Modern Optics Nankai UniversityTianjin Key Laboratory of Micro-scale Optical Information Science and TechnologyTianjin 300350China Photonics Research Center School of PhysicsMOE Key Lab of Weak-Light Nonlinear Photonicsand Tianjin Key Lab of Photonics Materials and Technology for Information ScienceNankai UniversityTianjin 300071China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore

Phonon-assisted upconverted emission is the heart of energy harvesting,bioimaging,optical cryptography,and optical *** has been demonstrated that emerging two-dimensional(2D)semiconductors can provide an excellent platform for efficient phonon-assisted upconversion due to the enhanced optical transition strength and phonon-exciton interaction of 2D ***,there is little research on the further enhancement of excitonic upconverted emission in 2D ***,we report the enhanced multiphoton upconverted emission of 2D excitons in doubly resonant plasmonic *** to the enhanced light collection,enhanced excitation rate,and quantum efficiency enhancement arising from the Purcell effect,an upconverted emission amplification of>1000-fold and a decrease of 2~3 orders of magnitude in the saturated excitation power are *** findings pave the way for the development of excitonic upconversion lasing,nanoscopic thermometry,and sensing,revealing the possibility of optical refrigeration in future 2D electronic or excitonic devices.

关键词： converted resonant doubly

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Online Gaming:Real Growth from the Virtual World

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China Today 2012年第4期61卷 48-49页

作者： staff reporter dai yuchen

2011 marks the beginning of the second decade in the story of China’s online gaming culture. According to the 2010 China Online Games Market Report published by the Ministry of Culture, the Chinese market for online games reached RMB 32.3 billion in 2010, an increase of 25.2 percent over the previous year. This strong growth points to good times ahead for the domestic gaming industry.

关键词：游戏文化虚拟世界 EAL 网络游戏中国市场市场报告在线游戏同比增长

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Asymmetrical Obstacles Enable Unilateral Inertial Focusing and Separation in Sinusoidal Microchannel

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Cyborg and Bionic Systems 2023年第1期4卷 233-242页

作者： Haotian Cha yuchen dai Helena HWBHansen Lingxi Ouyang Xiangxun Chen Xiaoyue Kang Hongjie An Hang Thu Ta Nam-Trung Nguyen Jun Zhang Queensland Micro-and Nanotechnology Centre Griffith UniversityNathanQueensland 4111Australia School of Engineering University of TasmaniaChurchill AvenueTasmania 7005Australia Bioscience Discipline School of Environment and ScienceGriffith UniversityNathanQueensland 4111Australia

Inertial microfluidics uses the intrinsic fluid inertia in confined channels to manipulate the particles and cells in a simple,high-throughput,and precise *** focusing in a straight channel results in several equilibrium positions within the cross *** channel curvature and adjusting the cross-sectional aspect ratio and shape can modify inertial focusing positions and can reduce the number of equilibrium *** this work,we introduce an innovative way to adjust the inertial focusing and reduce equilibrium positions by embedding asymmetrical obstacle *** demonstrated that asymmetrical concave obstacles could break the symmetry of original inertial focusing positions,resulting in unilateral *** addition,we characterized the influence of obstacle size and 3 asymmetrical obstacle patterns on unilateral inertial ***,we applied differential unilateral focusing on the separation of 10-and 15-μm particles and isolation of brain cancer cells(U87MG)from white blood cells(WBCs),*** results indicated an excellent cancer cell recovery of 96.4%and WBC rejection ratio of 98.81%.After single processing,the purity of the cancer cells was dramatically enhanced from 1.01%to 90.13%,with an 89.24-fold *** believe that embedding asymmetric concave microobstacles is a new strategy to achieve unilateral inertial focusing and separation in curved channels.

关键词： obstacle separation concave

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Distribution law analysis and calculating method for windage power in a geotechnical centrifuge

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第11期25卷 938-952页

作者： Chuanxiang ZHENG yuchen dai Jiao LIN Jianqun JIANG Jinjie LU Zhenyu WANG Jiaming YAN College of Energy Engineering Zhejiang UniversityHangzhou 310027China Huadong Engineering Co.Ltd. Hangzhou 300450China

Temperature rise caused by windage power is a major limitation to the large-scale process of geotechnical ***,there is no consensus on how to identify the key parts(parts with high windage power consumption)and parameters(the velocity coefficientαand windage coefficient C_(i)),and the influence of idle power is often neglected in methods for calculating windage *** address these issues,a Centrifugal Hypergravity and Interdisciplinary Experiment Facility(CHIEF)scaled model device was constructed,and the windage power was ***,a computational fluid dynamics(CFD)model of the device was established and validated by experimental *** results were analyzed to quantify the proportion of the windage power in different parts of the device and summarize the variation law of key ***,a novel windage power calculation equation was developed based on the elimination of the influence of the idle *** show that the role of the rotating arm cannot be ignored in the selection of key *** velocity coefficient and windage coefficient are a function of the device geometry and size,and are independent of the angular *** windage power is proportional to the cube of the angular velocity after eliminating the effect of idle power.

关键词： Geotechnical centrifuge Windage power Key parts and parameters Centrifugal Hypergravity and Interdisciplinary Experiment Facility(CHIEF) Idle power

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Phonon-assisted upconversion in twisted two-dimensional semiconductors

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Light(Science & Applications) 2023年第1期12卷 89-98页

作者： yuchen dai Pengfei Qi Guangyi Tao Guangjie Yao Beibei Shi Zhixin Liul Zhengchang Liu Xiao He Pu Peng Zhibo Dang Liheng Zheng Tianhao Zhang Yongji Gong Yan Guan Kaihui Liu Zheyu Fang School of Physics State Key Laboratory for Mesoscopic PhysicsAcademy for Advanced Interdisciplinary StudiesCollaborative Innovation Center of Quantum MatterNano-optoelectronics Frontier Center of Ministry of EducationPeking University100871 BeijingChina Institute of Modern Optics Nankai UniversityTianjin Key Laboratory of Micro-scale Optical Information Science and Technology300350 TianjinChina Photonics Research Center School of PhysicsMOE Key Lab of Weak-Light Nonlinear Photonicsand Tianjin Key Lab of Photonics Materials and Technology for Information ScienceNankai University300071 TianjinChina School of Materials Science and Engineering Beihang University100191 BeijingChina Center for Physicochemical Analysis and Measurements in ICCAS Analytical Instrumentation CenterPeking University100871 BeijingChina

Phonon-assisted photon upconversion(UPC)is an anti-Stokes process in which incident photons achieve higher energy emission by absorbing *** letter studies phonon-assisted UPC in twisted 2D semiconductors,in which an inverted contrast between UPC and conventional photoluminescence(PL)of WSe2 twisted bilayer is emergent.A 4-fold UPC enhancement is achieved in 5.5°twisted bilayer while PL weakens by *** interlayer exciton conversion efficiency driven by lattice relaxation,along with enhanced pump efficiency resulting from spectral redshift,lead to the rotation-angle-dependent UPC *** counterintuitive phenomenon provides a novel insight into a unique way that twisted angle affects UPC and light-matter interactions in 2D ***,the UPC enhancement platform with various superimposable means offers an effective method for lighting bilayers and expanding the application prospect of 2D stacked van der Waals devices.

关键词： twisted semiconductors relaxation

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媒介化研究的“中间道路”:物质性路径与传播型构

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南京社会科学 2021年第7期 104-112,121页

作者：戴宇辰华东师范大学政治学系上海200241

晚近二十余年,"媒介化"成为了欧洲媒介社会学界超越效果研究范式的一个新的研究领域。本文基于核心文献的梳理,认为当前国内外学界普遍形成了从"中介化"转向"媒介化"的理论共识,但仍存在着"制度化传统"和"社会建构传统"两条研究路径的... 详细信息

晚近二十余年,"媒介化"成为了欧洲媒介社会学界超越效果研究范式的一个新的研究领域。本文基于核心文献的梳理,认为当前国内外学界普遍形成了从"中介化"转向"媒介化"的理论共识,但仍存在着"制度化传统"和"社会建构传统"两条研究路径的分歧。借由当代社会理论中"结构/能动性"的矛盾,我们认为克服媒介化研究现存的分歧在于引入传播研究的"物质性"分析路径。进而借由物质性概念的引入,在中观分析层面,媒介化意味着社会基本联结形式由"型构"转向包含行动者丛、指引框架和传播实践三个基本要素的"传播型构"。本文还就媒介化理论与其余社会理论对话的可能性进行讨论。

关键词：媒介化社会理论物质性传播型构

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媒介化研究：一种新的传播研究范式

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安徽大学学报（哲学社会科学版） 2018年第2期42卷 147-156页

作者：戴宇辰华东师范大学上海200241

晚近十年,欧陆传播与文化研究陆续从"媒介研究"转向"媒介化研究",从而开启了传播学研究的范式变更。这种变革体现及其影响体现在以下四个层面:首先,"媒介化转向"带来的是欧陆传播研究学界的一种新的研究范式;其次,这一研究范式转移的核... 详细信息

晚近十年,欧陆传播与文化研究陆续从"媒介研究"转向"媒介化研究",从而开启了传播学研究的范式变更。这种变革体现及其影响体现在以下四个层面:首先,"媒介化转向"带来的是欧陆传播研究学界的一种新的研究范式;其次,这一研究范式转移的核心要点在于重新认识媒介;再次,媒介化研究作为一种传播研究的新范式必须被置于"比较的视野"中,从而与其同时期理论的对话与勾连;最后,媒介化研究可以为当代中国的传播研究带来了一些新的变化、启示和课题,为国内传播学研究开辟新的研究视角。

关键词：媒介化制度化情境化范式变更

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Self-design of arbitrary polarization-control waveplates via deep neural networks

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Photonics Research 2023年第5期11卷 695-711页

作者： ZHENGCHANG LIU ZHIBO DANG ZHIXIN LIU YU LI XIAO HE yuchen dai YUXIANG CHEN PU PENG ZHEYU FANG School of Physics State Key Lab for Mesoscopic PhysicsAcademy for Advanced Interdisciplinary StudiesCollaborative Innovation Center of Quantum MatterYangtze Delta Institute of Optoelectronicsand Nano-optoelectronics Frontier Center of Ministry of EducationPeking UniversityBeijing 100871China

The manipulation of polarization states beyond the optical limit presents advantages in various *** progress has been made in the design of meta-waveplates for on-demand polarization transformation,realized by numerical simulations and parameter sweep ***,due to the limited freedom in these classical strategies,particular challenges arise from the emerging requirement for multiplex optical devices and multidimensional manipulation of light,which urge for a large number of different nanostructures with great polarization control ***,we demonstrate a set of self-designed arbitrary wave plates with a high polarization conversion *** combine Bayesian optimization and deep neural networks to design perfect halfand quarter-waveplates based on metallic nanostructures,which experimentally demonstrate excellent polarization control functionalities with the conversion ratios of 85%and 90%.More broadly,we develop a comprehensive wave plate database consisting of various metallic nanostructures with high polarization conversion efficiency,accompanying a flexible tuning of phase shifts(0-2π)and group delays(0-10 fs),and construct an achromatic metalens based on this *** to the versatility and excellent performance,our self-designed wave plates can promote the performance of multiplexed broadband metasurfaces and find potential applications in compact optical devices and polarization division multiplexing optical communications.

关键词： polarization tuning wave

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