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SSRN 2023年

作者： Sun, Qiming Zhang, Ying Qin, Taotao College of Information Science and Technology Nanjing Forestry University Jiangsu Nanjing210037 China Key Laboratory of Transient Physics Nanjing University of Science and Technology Nanjing210094 China

Power system coincidence prediction plays an important role in the research field of electric power. However, due to the spontaneity and randomness of the participants, as well as the complexity of the structure and the mutual influence of the internal elements, it is difficult to establish the model. In this paper, the basic structure of multi-dimensional Taylor network based on intermittent feedback herding effect is proposed. The dead zone function is introduced to simulate the intermittent feedback of herd effect on the system. Different from the traditional prediction methods starting from the mechanism, this method focuses on the external representation of the internal data of the system, which is more suitable for global modeling. Taking the actual electricity data in Europe as an example, the effectiveness of the method proposed in this paper is verified. © 2023, The Authors. All rights reserved.

关键词： Forecasting

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Numerical study on interaction between rotating detonation backpressure and axial compressor

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Hangkong Dongli Xuebao/Journal of Aerospace Power 2025年第6期40卷

作者： Nie, Jiayi Wu, Yuwen Weng, Chunsheng Xia, Yiqing National Key Laboratory of Transient Physics Nanjing University of Science and Technology Nanjing210094 China

A coupled computational model of a transonic axial compressor and a rotating detonation combustor Stage 37 was constructed to investigate the impact of forward-propagating pressure waves generated by rotating backpressure on the internal flow field of the compressor. Furthermore, the effect of backpressure velocity on the compressor's performance was analyzed. It was observed that the forward-propagating wave interacted with both the stator and rotor blades, resulting in a slight upstream shift in the attached shockwave at the leading edge of the rotor blades due to the influence of the rotating backpressure. Moreover, the flow field structure of the stator was more significantly affected by rotational backpressure, and correspondingly, the forward pressure wave was relatively more strongly suppressed by the stator. In comparison with the peak efficiency point, the compressor's performance was found that CJ velocity backpressure (CJ was the detonation propagation velocity in the Chapman-Jouguet theory) had a positive effect on the compressor's efficiency, with an increase of 1% and wider operating range. © 2025 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.

关键词： Axial-flow compressors

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Timing fluctuation correction for the front end of a 100-PW laser

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High Power Laser science and Engineering 2023年第4期11卷 78-84页

作者： Hongyang Li Keyang Liu Xinliang Wang Xingyan Liu Xianze Meng Yanqi Liu Liwei Song Yuxin Leng Ruxin Li School of Physics Science and Engineering Tongji UniversityShanghaiChina State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghaiChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina XIOPM Center for Attosecond Science and Technology State Key Laboratory of Transient Optics and PhotonicsXi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’anChina

The development of high-intensity ultrafast laser facilities provides the possibility to create novel physical phenomena and matter *** timing fluctuation of the laser pulses is crucial for pump–probe experiments,which is one of the vital means to observe the ultrafast dynamics driven by intense laser *** this paper,we demonstrate the timing fluctuation characterization and control of the front end of a 100-PW laser that is composed of a high-contrast optical parametric amplifier(seed)and a 200-TW optical parametric chirped pulse amplifier(preamplifier).By combining the timing jitter measurement with a feedback system,the laser seed and preamplifier are synchronized to the reference with timing fluctuations of 1.82 and 4.48 fs,*** timing system will be a key prerequisite for the stable operation of 100-PW laser facilities and provide the basis for potential pump–probe experiments performed on the laser.

关键词： feedback control high-intensity ultrafast laser timing fluctuation

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Dft Study on Fused N-Heteroaromatic Frameworks: Stability, Aromaticity, and Energetic Insights from Five-Membered Fused Six-Membered N-Heteroaromatic Skeletons

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SSRN 2024年

作者： Zhang, Jianguo Lu, Zujia Li, Cong Li, Shaoqun Yu, Qiyao State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing100081 China State Key Laboratory of Transient Chemical Effects and Control Shaanxi Applied Physics and Chemistry Research Institute Shaanxi Xi’an710061 China

The five-membered fused six-membered nitrogen heteroaromatic ring system is a crucial skeleton in the design and synthesis of energetic compounds. Based on this skeleton, many high-performance energetic compounds have been synthesized. However, to date, no one has conducted a systematic study on the characteristics of this skeleton itself. To assess how the number and position of nitrogen atoms affect the energy and stability of this type of skeleton, one to four nitrogen-substituted skeleton molecules were analyzed using Density Functional Theory (DFT) calculations. Natural population analysis (NPA), Laplacian bond order (LBO) analysis, aromaticity studies, and enthalpy of formation calculations were performed. Patterns observed in the computational results were summarized, and their potential correlations were analyzed. Based on these findings, design recommendations for derivatives of these skeletons in energetic compounds were proposed to serve as a reference for energetic material chemists. © 2024, The Authors. All rights reserved.

关键词： Density functional theory

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Experimental study on the detonation process of a pulse detonation engine with ionized seeds

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Defence technology（防务技术） 2020年第1期16卷 178-187页

作者： Ling Lin Shun-an Hu Yan-bin Hu Guang-ju Xu Hong-yu Jiao Chun-sheng Weng School of Automotive Engineering Changshu Institute of TechnologySuzhou215500China National Key Laboratory of Transient Physics Nanjing University of Science and TechnologyNanjing210094China

An experimental platform of a pulse detonation engine(PDE) was established to study the effect of different K_2 CO_3 ionized seed mass contents on the detonation *** pressure and ion concentration were detected in the detonation process of the PDE with different contents of ionized *** initiation process of the PDE at different ignition frequencies was *** results show that the gas conductivity in the detonation process increased by adding ionized seeds to the PDE tube,and the conductivity increased with the increase in ionized seed mass *** the increase in ionized seed mass content,the range of the conductivity *** PDE was successfully ignited and formed a stable detonation wave at ignition frequencies of 5 Hz and 10 Hz,and the peak pressure of the stable detonation with the ignition frequency of 5 Hz was 17% higher than that with an ignition frequency of 10 *** detonation wave intensity was weake ned and dege nerated to a shock wave that propagated in the tube without the fuel filled at the ignition frequency of 20 Hz.

关键词： Pulse detonation engine Ionized seeds Detonation process Ignition frequency

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Modeling and simulation of muzzle flow field of railgun with metal vapor and arc

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Defence technology（防务技术） 2020年第4期16卷 802-810页

作者： Yuan Gao Yan-jie Ni Zhao-xin Wang Ying-tao Xu Yong Jin Bao-ming Li National Key Laboratory of Transient Physics Nanjing University of Science and TechnologyNanjing 210094JiangsuChina China Academy of Ordnance 100089BeijingChina

During the electromagnetic railgun launching process,there will be a complex flow field with high temperature in the muzzle area because of the high-speed friction,transition and seco ndary *** paper models the muzzle area of railgun when the projectile is far away from the muzzle,and the dynamic simulation of the flow field with secondary arc in the muzzle area is carried out based on the magneto hydrodynamic ***,a multi-component plasma transport model is used to analyze the muzzle arc plasma flow process of the mixed gas of Al vapor and the ***,the pressure boundary conditions are fitted by the dynamic mesh simulation *** current and voltage of the muzzle are obtained through the emission experiment of the railgun experimental *** load the current data into the simulation model and the voltage of experiments and simulations are compared,which proves the accuracy of the *** the plasma temperature and the composition of Al vapor in the muzzle flow process are analyzed in-depth.

关键词： Railgun Flow field Muzzle Plasma Simulation Al vapor

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Photonic-chip-based dense entanglement distribution

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PhotoniX 2023年第1期4卷 522-530页

作者： Shang-Yu Ren Wei-Qiang Wang Yu-Jie Cheng Long Huang Bing-Zheng Du Wei Zhao Guang-Can Guo Lan-Tian Feng Wen-Fu Zhang Xi-Feng Ren CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Transient Optics and Photonics Xi’an Institute of Optics and Precision MechanicsChinese Academy of SciencesXi’an 710119China University of Chinese Academy of Sciences Beijing 100049China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

The dense quantum entanglement distribution is the basis for practical quantum communication,quantum networks and distributed quantum *** make entanglement distribution processes stable enough for practical and large-scale applications,it is necessary to perform them with the integrated ***,we first integrate a dense wavelength-division demultiplexing system and unbalanced Mach-Zehnder interferometers on one large-scale photonic chip and demonstrate the multi-channel wavelength multiplexing entanglement distribution among distributed photonic ***,we use one chip as a sender to produce high-performance and wideband quantum photon pairs,which are then sent to two receiver chips through 1-km standard optical *** receiver chip includes a dense wavelength-division demultiplexing system and unbalanced Mach-Zehnder interferometers and realizes multi-wavelength-channel energy-time entanglement generation and *** quantum interference visibilities prove the effectiveness of the multi-chip *** work paves the way for practical entanglement-based quantum key distribution and quantum networks.

关键词： computation quantum distribution

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Experimental Study of Combustion Efficiency and Outlet Temperature Distribution Characteristics of a Combined Evaporative Flameholder

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SSRN 2024年

作者： Zhu, Huanyu Huang, Yakun Zhu, Zhixiang Liu, Ming He, Xiaomin College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Jiangsu Nanjing210016 China National Key Laboratory of Transient Physics Nanjing University of Science and Technology Nanjing210094 China

As the primary stabilizing core component of current ramjet or augmented combustion chambers, a combined evaporative flameholder is designed to serve as a piloted flame-stabilized device. Combustion efficiency and outlet temperature distribution are experimentally studied under varying inlet Mach numbers, temperatures, pressures, and equivalence ratios employing the mainstream fuel supply strategy with direct-injection nozzles. During testing, the proportion of fuel injected into the combined evaporative flameholder for the piloted flame remains constant as a fraction of the total fuel mass flow rate. The results indicate that the combustion efficiency gradually increased with the rise in temperature within the temperature range of 600 K to 800 K. Within the Mach number range of 0.11 to 0.19, the combustion efficiency initially increased, followed by a decrease with the increase in Mach numbers. Combustion efficiency shows a gradually decreasing trend with the rise of inlet pressure in the range of 0.04 to 0.101 MPa. Under an inlet temperature of 600 K, the combustion efficiency of the flameholder drops from 55.84% to 19.36% as the fuel-to-air ratio(FAR) increases from 0.008 to 0.044. When the FAR rises to 0.055, the combustion efficiency increases to 24.74%. Similar characteristics of the outlet temperature distribution appear under different inlet temperature and pressure conditions, and its change occurs during the change of inlet Mach number. This study provides theoretical guidance and engineering application value for the flame stabilization mechanism and performance enhancement of combined flameholders in afterburners or ramjet combustors. © 2024, The Authors. All rights reserved.

关键词： Mach number

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Direct numerical simulation on relevance of fluctuating velocities and drag reduction in turbulent channel flow with spanwise space-dependent electromagnetic force

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Chinese physics B 2019年第5期28卷 166-174页

作者： Dai-Wen Jiang Hui Zhang Bao-Chun Fan An-Hua Wang Science and Technology on Transient Physics Laboratory Nanjing University of Science and Technology

Based on the Fourier–Chebyshev spectral method, the control of turbulent channel flow by space-dependent electromagnetic force and the mechanism of drag reduction are investigated with direct numerical simulation(DNS) methods for different Reynolds numbers. A formula is derived to express the relation between fluctuating velocities and the friction drag coefficient. With the application of electromagnetic force, the in-depth relations among the fluctuating velocities near the wall, Reynolds stress, and the effect of drag reduction for different Reynolds numbers are discussed. The results indicate that the maximum drag reductions can be obtained with an optimal combination of parameters for each case of different Reynolds numbers. The fluctuating velocities along the streamwise and normal directions are suppressed significantly,while the fluctuating velocity along the spanwise direction is enhanced dramatically due to the spanwise electromagnetic force. However, the values of Reynolds stress depend on the fluctuating velocities along the streamwise and normal directions rather than that along the spanwise direction. Therefore, the significant effect of drag reduction is obtained. Moreover,the maximum drag reduction is weakened due to the decay of control effect for fluctuating velocities as the Reynolds number increases.

关键词： flow control turbulent channel flow electromagnetic force direct numerical simulation

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An Electrical Analogy Model for Performance Evaluation of Thermoelectric Generator Modules Considering Nonlinear Effect of Heat Convection

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SSRN 2023年

作者： Zu, Wei Ying, Zhanfeng Shi, Tingchuan Lin, Jiaxue Zhao, Jian National Key Laboratory of Transient Physics Nanjing University of Science and Technology Xiaolingwei Nanjing200 China School of Energy and Power Engineering Nanjing University of Science and Technology Xiaolingwei Nanjing200 China

With the development of thermoelectric energy harvesting technology, performance evaluation of thermoelectric generator (TEG) module has an important significance for the reliability improvement and optimization design of thermoelectric energy harvesting system. In this paper, an electrical analogy model for performance evaluation of TEG modules is proposed considering nonlinear characteristics of natural and forced convection conditions. An identification method based on the multi-objective optimization and the NSGA-II algorithm is presented to determine the model parameters which are difficult to calculate in theory. An experimental platform is designed to validate the effectiveness and advantages of the proposed method. The experimental results show that the proposed model is more accurate than the traditional model in evaluating the output performance of TEG module under natural and forced convection. © 2023, The Authors. All rights reserved.

关键词： Forced convection

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