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Thermochemical non-equilibrium flow characteristics of high Mach number inlet in a wide operation range

Chinese Journal of Aeronautics 2023年第12期36卷 164-184页

作者： Chunliang DAI Bo SUN Lianjie YUE Shengbing ZHOU Changfei ZHUO Changsheng ZHOU Jianyi YU School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China State Key Laboratory of High Temperature Gas Dynamics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China College of Aerospace Engineering Chongqing UniversityChongqing 400044China Beijing System Design Institute of Electro-mechanic Engineering Beijing 102308China

The high-temperature non-equilibrium effect is a novel and significant issue in the flows over a high Mach number(above Mach 8)air-breathing ***,this study attempts to investigate the high-temperature non-equilibrium flows of a curved compression two-dimensional scramjet inlet at Mach 8 to 12 utilizing the two-dimensional non-equilibrium RANS ***,the thermochemical non-equilibrium gas model can predict the actual high-temperature flows,and the numerical results of the other four thermochemical gas models are only used for comparative ***,the thermochemical non-equilibrium flow fields and work performance of the inlet at Mach 8 to 12 are ***,the influences of high-temperature non-equilibrium effects on the starting characteristics of the inlet are *** results reveal that a large separation bubble caused by the cowl shock/lower wall boundary layer interaction appears upstream of the shoulder,at Mach *** separation zone size is smaller,and its location is closer to the downstream area while the thermal process changes from frozen to non-equilibrium and then to *** the increase of inflow Mach number,the thermochemical non-equilibrium effects in the whole inlet flow field gradually strengthen,so their influences on the overall work performance of the high Mach number inlet are more *** vibrational relaxation or thermal non-equilibrium effects can yield more visible influences on the inlet performance than the chemical non-equilibrium *** inlet in the thermochemical non-equilibrium flow can restart more easily than that in the thermochemical frozen *** work should provide a basis for the design and starting ability prediction of the high Mach number inlet in the wide operation range.

关键词： Non-equilibrium Scramjet inlet Starting ability Thermochemical Work performance

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Corrosive Effect on Saturated Pool Boiling Heat Transfer Characteristics of Metallic Surfaces with Hierarchical Micro/Nano Structures

SSRN

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SSRN 2023年

作者： Xu, Wei Tang, Longchang Zhao, Ningkang Ouyang, Kun Zeng, Chang Liu, Xiaojing He, Xiaoqiang College of Smart Energy Shanghai Jiao Tong University Shanghai200240 China Shanghai200240 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China

Surface modification is of critical interest to enhance boiling heat transfer in terms of heat transfer coefficient or critical heat flux (CHF), which is significantly affected by distinct surface morphology and wettability and it can improve the efficiency and safety of equipment. Furthermore, actual service environment may cause severe corrosion to the processed structured surfaces while its consequence on boiling heat transfer is still obscure. In this research, comprehensive researches are conducted to unravel corrosive effect on metallic samples made of stainless steel (SS) and Inconel materials with microstructures. Different constructions (i.e., microgroove, microcavity and micropillar array) and characteristic dimensions (~20, 50 μm) of microstructure, various duration time (up to 300 days) and pH values (~7.0 to 8.5) of corrosive environment are compared thoroughly. Conclusions can be drawn that not all microstructures can enhance pool boiling heat transfer characteristics, especially in terms of CHF values. More importantly, CHF value of SS microgroove sample firstly increases from 60.94 to 94.09 W·cm-2 in 50 days, then decreases to 47.77 W·cm-2 in 300 days, which can be attributed to competition result between formation of hierarchical micro/nano structure with enhancing wicking capability and chemistry condition with increasing contact angle. In addition, distinct bubble dynamics during pool boiling is also analyzed. The insights obtained from this article can be used to guide surface modification method and to reveal evolvement rule of engineered metallic surface in highly corrosive and harsh boiling heating transfer environment. © 2023, The Authors. All rights reserved.

关键词： Corrosive effects

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Applying multi-scale simulations to materials research of nuclear fuels:A review

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Materials Reports(Energy) 2021年第3期1卷 64-80页

作者： Chunyang Wen Di Yun Xinfu He Yong Xin Wenjie Li Zhipeng Sun School of Nuclear Science and Technology Xi'an Jiaotong UniversityXi'an710049China State Key Laboratory of Multiphase Flow Xi'an Jiaotong UniversityXi'an710049China China Institute of Atomic Energy Beijing102413China Key Laboratory of Nuclear Reactor System Design Technology Nuclear Power Institute of ChinaChengdu610213China

Computational simulation is an important technical means in research of nuclear fuel *** nuclear fuel issues are inherently multi-scopic,it is imperative to study them with multi-scale simulation *** present,the development of multi-scale simulation for nuclear fuel materials calls for a more systematic approach,in which lies the main purpose of this *** most important thing in multi-scale simulation is to accurately formulate the goals to be achieved and the types of methods to be *** this regard,we first summarize the basic principles and applicability of the simulation methods which are commonly used in nuclear fuel research and are based on different scales ranging from micro to macro,***-Principles(FP),Molecular Dynamics(MD),Kinetic Monte Carlo(KMC),Phase Field(PF),Rate Theory(RT),and Finite Element Method(FEM).And then we discuss the major material issues in this field,also ranging from micro-scale to macro-scale and covering both pellets and claddings,with emphasis on what simulation method would be most suitable for solving each of the ***,we give our prospective analysis and understanding about the feasible ways of multi-scale integration and relevant handicaps and challenges.

关键词： Computational simulation Nuclear fuel Multi-scale modeling Irradiation behavior

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Strong Coupled Magnetic and Electric Ordering in Monolayer of Metal Thio(seleno)phosphates

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Chinese Physics Letters 2021年第7期38卷 145-150页

作者： Chenqiang Hua Hua Bai Yi Zheng Zhu-An Xu Shengyuan A.Yang Yunhao Lu Su-Huai Wei Zhejiang Province Key Laboratory of Quantum Technology and Device State Key Laboratory of Silicon MaterialsDepartment of PhysicsZhejiang UniversityHangzhou 310027China Research Laboratory for Quantum Materials Singapore University of Technology and DesignSingapore 487372Singapore Beijing Computational Science Research Center Beijing 100193China

The coupling between electric ordering and magnetic ordering in two-dimensional(2D)materials is important for both fundamental research of 2D multiferroics and future development of magnetism-based information storage and ***,we introduce a scheme for realizing a magnetic phase transition through the transition of electric *** take CuMoP_(2)S_(6) monolayer as an example,which is a member of the large 2D transition-metal chalcogen-phosphates *** on first-principles calculations,we find that it is a multiferroic with unprecedented characters,namely,it exhibits two different phases:an antiferroelectric-antiferromagnetic phase and a ferroelectric-ferromagnetic phase,in which the electric and magnetic orderings are strongly ***,the electric polarization is out-of-plane,so the magnetism can be readily switched by using the gate electric *** finding reveals a series of 2D multiferroics with special magnetoelectric coupling,which hold great promise for experimental realization and practical applications.

关键词： ferroelectric coupling transition

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Creep Behavior of a Novel Ods Ferrite Steel Reinforced with Ultra-Fine Y2(Zr0.6, Ti0.4)2O7 Particles

SSRN

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SSRN 2024年

作者： Zhao, Zhenyu Cao, Yuankui Zhang, Yuyang Fu, Ao Zhang, Ruiqian Zhong, Yuntao Li, Jia Fang, Qihong Liu, Bin State Key Laboratory of Powder Metallurgy Central South University Changsha410083 China Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of China Chengdu610041 China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body China

Oxide dispersion strengthened (ODS) ferrite steel is a competitive candidate structural material for the Generation IV fission reactors. In this work, a novel ODS ferrite steel reinforced with ultra-fine Y2(Zr0.6, Ti0.4)2O7 particles was prepared by powder metallurgy method, which exhibit superior mechanical properties at elevated temperatures. Creep tested of the ODS ferrite steel at 800 ℃ was conducted to reveal its high-temperature creep failure mechanism. This ODS steel has an average grain size of 1.31 μm, and the mean size and number density of the ultra-fine oxide particles are 5.48 nm and 4.85×1023 m-3, respectively. When the apply creep stress is 100 MPa, the creep rupture time of the ODS steel is 2448.5 h, and the minimum creep rate is only 1.05×10-7 s-1. Under the similar creep stress at 800 ℃, the creep rate of this ODS steel is at least one order of magnitude lower than that of other typical ODS steels reported in the literatures, showing excellent creep properties. By fitting the data of minimum creep rate, apply stress and effective stress normalized by shear modulus, the creep threshold stress of the ODS steel was determined as 56.2 MPa, and the true stress exponent was calculated as 4.5 ± 1.0, which indicates that the creep mechanism is dominated by dislocation. Orowan bypass mechanism and dislocation climb over the particle mechanism play a major role in this dislocation mediated creep behavior. Due to the strong hindering effect of dislocation motion caused by the ultra-fine and dispersed Y2(Zr0.6, Ti0.4)2O7 particles, the novel ODS ferrite steel thereby achieved excellent creep properties. © 2024, The Authors. All rights reserved.

关键词： Creep

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Load balancing strategy for wireless multi-hotspot networks based on improved NSGA-II algorithm

Load balancing strategy for wireless multi-hotspot networks ...

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2022 International Conference on Networking and Network Applications, NaNA 2022

作者： Yu, Han Zhan, Jie Libin, Jiao Han, Jun-Mei School of Physics and Electronic Science Hunan University of Science and Technology Xiangtan412001 China Science and Technology on Communication Networks Laboratory Shijiazhuang050081 China National Key Laboratory for Complex Systems Simulation Department of Systems General Design Institute of Systems Engineering Beijing100101 China

ISBN: (数字)9781665461313

ISBN: (纸本)9781665461313

IEEE 802.11 Wireless Local Area Network (WLAN) is a popular way for mobile devices to access the Internet. Operators and service providers often increase the density of wireless access points in order to provide users with better connections and user experience. As a result, WLAN users find themselves covered by multiple access points. In traditional wireless multi-hotspot networks most user terminals choose the access point with the strongest signal without considering the existing load on that access point, leading to severe congestion and load imbalance problems. This paper proposes an improved NSGA-II-based load balancing strategy for wireless multi-hotspot networks, which determines which hotspot should be associated with each user terminal by taking into account the current access point load, the received signal strength and the throughput size of the user terminal. The simulation results show that compared with the traditional strongest signal First (SSF) strategy, the proposed load balancing strategy can improve the network throughput by more than 30%. © 2022 IEEE.

关键词： IEEE Standards

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Study on flow modes of open natural circulation with low height difference under low power conditions

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International Journal of Advanced Nuclear reactor design and technology 2020年 2卷 10-14页

作者： Yi, Li Jianchuang, Sun Hang, Peng Cheng, Xiang Quan, Biao Cao, Xiaxin Jian, Zhou Ming, Ding Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China Fundamental Science on Nuclear Safety and Simulation Technology Laboratory Harbin Engineering University Harbin150001 China

Open natural circulation systems are widely applied in the field of energy and chemical industries. Under some special conditions, open natural circulation systems with low height difference need to be applied, but research on this type of systems is not sufficient. In this paper, the flow modes of sucha natural circulation system were experimentally studied at low power level by adopting steam heating. In addition, the flow modes and physical phenomena of the natural circulation system were analyzed in detail under different heating power conditions. It is found that there are four flow modes at different power levels in the natural circulation system due to the influence of non-condensable gas and subcooled boiling. The inlet and outlet temperatures of heating section are analyzed in different flow modes. The result shows that the outlet temperature of heating section can be used as a judgment criterion for different flow modes. © 2019

关键词： Chemical industry

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Future Healthcare Recommender Systems: Applications, Open Issues, and Challenges

Future Healthcare Recommender Systems: Applications, Open Is...

引用

International Conference on e-health Networking, Applications and Services (HealthCom)

作者： Hongzheng Ju Kebing Jin Jianhang Tang Yang Zhang Bo Wang Zehui Xiong State Key Laboratory of Public Big Data Guizhou University China College of Computer Science and Technology Nanjing University of Aeronautics and Astronautics China Pillar of Information Systems Technology and Design Singapore University of Technology and Design Singapore

ISBN: (数字)9798350350548

ISBN: (纸本)9798350350555

With the enhancement of health awareness and the development of artificial intelligent technology, healthcare recommender systems (HRS) play an increasingly important role in individual health management. Meanwhile, the widespread usage of large models has significantly improved the efficiency and accuracy in the analysis and utilization of medical data. In this paper, we comprehensively summarize the basic types of recommender systems as well as the new trends in utilizing large models. Then we introduce the recommendation applications in healthcare areas from six aspects, i.e., disease risk prediction, medication recommendation, medical resource recommendation, mental health support, health life management, and health education. At last, we explore some current issues and challenges within HRS, as well as the development of potential solutions and directions in the future.

关键词： Technological innovation Accuracy Knowledge based systems Medical services Mental health Market research User experience Real-time systems Recommender systems Monitoring

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The MYB61-STRONG2 module regulates culm diameter and lodging resistance in rice

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Journal of Integrative Plant Biology 2025年第2期67卷 243-257页

作者： Yong Zhao Xianpeng Wang Jie Gao Muhammad Abdul Rehman Rashid Hui Wu Qianfeng Hu Xingming Sun Jinjie Li Hongliang Zhang Peng Xu Qian Qian Chao Chen Zichao Li Zhanying Zhang Frontiers Science Center for Molecular Design Breeding Key Laboratory of Crop Heterosis and Utilization(MOE)Beijing Key Laboratory of Crop Genetic ImprovementCollege of Agronomy and BiotechnologyChina Agricultural UniversityBeijing 100193China Hainan Seed Industry Laboratory Sanya 572024China Sanya Institute of China Agricultural University Sanya 572025China Yazhouwan National Laboratory Sanya 572024China CAS Key Laboratory of Tropical Plant Resources and Sustainable Use The Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglun 666303China State Key Laboratory of Crop Germplasm Innovation and Molecular Breeding Life Science and Technology CenterChina National Seed Group Co.LtdWuhan 430073China Sanya Institute Hainan Academy of Agricultural SciencesSanya 572024China

Lodging reduces grain yield and quality in cereal *** resistance is affected by the strength of the culm,which is influenced by the culm diameter,culm wall thickness,and cell wall *** explore the genetic architecture of culm diameter in rice(Oryza sativa),we conducted a genome-wide association study(GWAS).We identified STRONG CULM 2(STRONG2),which encodes the mannan synthase CSLA5,and showed that plants that overexpressed this gene had increased culm diameter and improved lodging ***2 appears to increase the levels of cell wall components,such as mannose and cellulose,thereby enhancing sclerenchyma development in ***14931253 in the STRONG2 promoter contributes to variation in STRONG2 expression in natural germplasms and the transcription factor MYB61 directly activates STRONG2 ***,STRONG2 overexpressing plants produced significantly more grains per panicle and heavier grains than the wild-type *** results demonstrate that the MYB61-STRONG2 module positively regulates culm diameter and lodging resistance,information that could guide breeding efforts for improved yield in rice.

关键词： cellulose CSLA5 lodging resistance mannose MYB61 STRONG2

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Development of Telemetry Wave Instrument Based on MEMS Sensing technology 3

Development of Telemetry Wave Instrument Based on MEMS Sensi...

引用

3rd International Conference on Geology, Mapping and Remote Sensing, ICGMRS 2022

作者： Yang, Sujun Shen, Jiacheng Shi, Panhao Ma, Xiang Marine Design & Research Institute of China Shanghai China Laboratory of Science and Technology on Water Jet Shanghai China Shanghai Key Laboratory of Ship Engineering Shanghai China

ISBN: (数字)9781665485951

ISBN: (纸本)9781665485951

Regarded as the most important object of marine environmental monitoring, wave condition especially the height, period measurement technology has comprehensively involved various means during the deepening of wave research. Among many wave measuring methods, wave measuring buoy is recognized as the most direct and accurate equipment. Acceleration integration and turbine flow meter constitute the traditional mainstream of wave testing. GPS and MEMS sensors have been developed to measure waves in recent years. Because buoy is a wave measuring equipment that directly contacts the sea surface, its measuring accuracy is higher than that of other wave measuring methods, so it is also considered by foreign countries as the most direct and accurate wave measuring equipment. In this paper, GPS and MEMS sensing technology are mainly used to analyze the wave height and period measurement. At the same time, the main development process of the wave height gauge is introduced extensively. Finally, the accuracy and repeatability of the wave height meter are tested by means of walking crane, certificated meter ruler and stopwatch. The test results show that it can meet the relevant standards of wave measurement and monitoring. On this basis, the sensor is tested in the South China Sea, and the reliability of the instrument is further verified. In one word, the paper can provide theoretical basis and technical support for the research and development of wave measurement equipment and promote the practical application in the field of wave condition monitoring. © 2022 IEEE.

关键词： Buoys

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