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Experimental Investigation of Flame Dynamics Based on High-Speed Images in Swirl Combustion Systems

Journal of Thermal Science 2023年第1期32卷 427-437页

作者： LI Yao hu chunyan ZHAO Qianpeng YANG Jinhu TAN Xiangmin XU Gang Key Laboratory of Light Duty Gas Turbine Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academyof Sciences Beijing 100049China Innovation Academy for Light-Duty Gas Turbine Chinese Academy of SciencesBeijing 100190China

The interaction mechanism of internally-staged-swirling stratified flame is complex,and the pilot flame has a manifest influence on flame *** study this,a series of experimental investigations for the pilot flame has been carried out in a model swirl combustor by only supplying the pilot *** CH*chemiluminescence images of the pilot flame are acquired by a high-speed camera with a CH*bandpass filter,whose dynamic characteristics are identified by image statistical analysis and proper orthogonal decomposition(POD)*** the fast algorithm based on matrix theory proposed in this paper increases the operation efficiency and operability of *** the pilot equivalence ratioΦincrease,the pilot flame gradually shows an unstable state,whose POD energy distribution is significantly *** the unstable state,the flame dynamics include three modes—spiral motion mode,flame shedding mode,and axial oscillation mode,whose formation reasons have also been further analyzed in combination with the experimental *** the fast Fourier transform(FFT)analysis of the time coefficients for the first four POD modes indicates all the dominant frequency is 280 Hz,which means the model combustor is in *** addition,a sensitivity analysis based on the different image resolutions further reveals the robustness of the POD method and its optimization *** results emphasize the important influence of the pilot fuel flow rate on the stability of the pilot flame.

关键词： pilot flame high speed image flame dynamics proper orthogonal decomposition

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Fixed-Time Antidisturbance Consensus Tracking for Nonlinear Multiagent Systems With Matching and Mismatching Disturbances

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IEEE/CAA Journal of Automatica Sinica 2024年第6期11卷 1410-1423页

作者： Xiangmin Tan chunyan hu Guanzhen Cao Qinglai Wei Wei Li Bo Han Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190 School of Aeronautics and Astronautics University of Chinese Academy of SciencesBeijing 100049China Institute of Automation Chinese Academy of SciencesBeijing 100190 School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100049China IEEE

In this paper,fixed-time consensus tracking for mul-tiagent systems(MASs)with dynamics in the form of strict feed-back affine nonlinearity is addressed.A fixed-time antidistur-bance consensus tracking protocol is proposed,which consists of a distributed fixed-time observer,a fixed-time disturbance observer,a nonsmooth antidisturbance backstepping controller,and the fixed-time stability analysis is conducted by using the Lyapunov theory *** paper includes three main ***,a distributed fixed-time observer is developed for each follower to obtain an estimate of the leader’s output by utilizing the topology of the communication ***,a fixed-time disturbance observer is given to estimate the lumped disturbances for feedforward ***,a nonsmooth antidisturbance backstepping tracking controller with feedforward compensation for lumped disturbances is *** order to mitigate the“explosion of complexity”in the tradi-tional backstepping approach,we have implemented a modified nonsmooth command filter to enhance the performance of the closed-loop *** simulation results show that the pro-posed method is effective.

关键词： Antidisturbance backstepping consensus tracking fixed-time stability multiagent system(MASs) strict feedback affine nonlinear systems.

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A New Methodology for Early Detection of Thermoacoustic Combustion Oscillations Based on Permutation Entropy

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Journal of Thermal Science 2023年第6期32卷 2310-2320页

作者： LI Yao hu chunyan SHEN Youhao HAN Bo YANG Jinhu XU Gang Key Laboratory of Light Duty Gas Turbine Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China Innovation Academy for Light-Duty Gas Turbine Chinese Academy of SciencesBeijing100190China

We carry out a series of experimental investigations in a model combustor to detect a precursor of thermoacoustic combustion oscillations based on permutation entropy,which can amplify the subtle changes effected in the time sequence to identify the *** changing the flame’s location or the fuel flow to a value,an abrupt switch from aperiodic small-amplitude oscillations to periodic large-amplitude oscillations would occur in pressure *** characteristic frequency of combustion oscillation is obtained by spectral analysis,with which a modified algorithm of the permutation entropy is *** impact evaluation on key parameters such as moving step sizes and window sizes reveals that the moving data permutation entropy has strong robustness,and can accurately detect the onset of thermoacoustic *** nonlinear analysis exhibits peculiar dynamics of the combustion system,which result in specific patterns in the time series and provide a theoretical basis for anomaly *** results suggest that the permutation entropy has a certain potential in early warning and detection of combustion oscillations.

关键词： thermoacoustic combustion oscillation permutation entropy moving data anomaly detection precursors

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A utility and easily fabricated dual-mode fiber film for efficient and comfortable thermal management

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Journal of Energy Chemistry 2024年第11期98卷 394-405页

作者： Jiyuan Yu Jian Zheng Wei Wang Zhijia Zhu chunyan hu Baojiang Liu College of Chemistry and Chemical Engineering Donghua UniversityShanghai 201620China Department of Textile&Garment Engineering Changshu Institute of TechnologyChangshu 215500JiangsuChina

Nowadays, the global climate is constantly being destroyed and the fluctuations in ambient temperature are becoming more frequent. However, conventional single-mode thermal management strategies(heating or cooling) failed to resolve such dynamic temperature changes. Moreover, developing thermal management devices capable of accommodating these temperature variations while remaining simple to fabricate and durable has remained a formidable obstacle. To address these bottlenecks, we design and successfully fabricate a novel dual-mode hierarchical(DMH) composite film featuring a micronanofiber network structure, achieved through a straightforward two-step continuous electrospinning process. In cooling mode, it presents a high solar reflectivity of up to 97.7% and an excellent atmospheric transparent window(ATW) infrared emissivity of up to 98.9%. Noted that this DMH film could realize a cooling of 8.1 ℃ compared to the ambient temperature outdoors. In heating mode, it also exhibits a high solar absorptivity of 94.7% and heats up to 11.9 ℃ higher than black cotton fabric when utilized by individuals. In practical application scenarios, a seamless transition between efficient cooling and heating is achieved by simply flipping the film. More importantly, the DMH film combining the benefits of composites demonstrates portability, durability, and easy-cleaning, promising to achieve large-scale production and use of thermally managed textiles in the future. The energy savings offered by film applications provide a viable solution for the early realization of carbon neutrality.

关键词： Micro-nanofiber film Dual-mode Comfortable thermal management Simplified production Utility Energy saving

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Tuning thermal decomposition of ammonium perchlorate by nanoporous Gd2O3 for improved safety and enhanced propellant efficiency

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Journal of Rare Earths 2020年第1期38卷 108-112页

作者： Xuezhen Zhou chunyan hu Xiaojun Liu Weifan Chen Qun Tang Yongxiu Li Research Center for Rare Earths&Nano/micro Functional Materials Nanchang UniversityNanchang 330047China Jiangxi Agricultural University Nanchang 330045China

Nanoporous Gd2O3 powders(NGPs) with different specific surface areas were prepared by a nonaqueous sol-gel method and utilized to tune the exothermal decomposition of ammonium perchlorate(AP) for enhanced propellant efficiency and improved *** is found that with the increasing dosage of NGPs into AP,the two exothermal peaks of AP merge into one intense exothermal peak,indicating that an "energy stacking" has been ***,the unique delay of the first exothermal peak of AP is conducive to the safety of AP in application ***,the dependence of decomposition heat of AP on dosage and calcination temperature is more evident than on the surface areas of NGPs,suggesting that the promotion effect of NGPs on the thermal decomposition of AP does not only rely on the surface ***,an electron transfer mechanism is proposed to illustrate the decomposition process of AP tuned by NGPs.

关键词： Nanoporous Gd2O3 powders Thermal decomposition Ammonium perchlorate Electron transfer mechanism Rare earths

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Optimization of Flow Matching Schemes for a Heavy Gas Turbine Burning Syngas

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Journal of Thermal Science 2020年第5期29卷 1292-1299页

作者： GUO Lei LI Guoqing hu chunyan LEI Zhijun huANG Enliang GONG Jianbo XU Gang Key Laboratory of Light-duty Gas-turbine Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China

A heavy-duty gas turbine,designed for natural gas,was used to bum the syngas with two different calorific *** study was mainly to optimize the flow matching scheme for the gas *** models of gas turbine burning syngas with different calorific values were established and the calculation models of different flow matching schemes were *** optimum scheme was obtained by evaluating thermal efficiency and work output under different operating *** results showed that the highest unit efficiency was achieved by,without significant drop in work output,increasing the throat area of the turbine nozzle and reducing the initial temperature of the *** the premise of ensuring the safety of the gas turbine unit,increasing the pressure ratio of the compressor could further improve the unit efficiency and the work *** adjusting the angle of the inlet guide vane fails to match the flow of compressor and *** measures such as reducing inlet temperature of turbine or air bleed still need to be adopted,but the thermal efficiency dropped significantly in this process.

关键词： gas turbine flow matching syngas

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Real-time in vivo visualization of tumor therapy by a near-infrared-II Ag2S quantum dot-based theranostic nanoplatform

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Nano Research 2015年第5期8卷 1637-1647页

作者： Feng hu chunyan Li Yejun Zhang Mao Wang Dongming Wu Qiangbin Wang Key Laboratory of Nano-Bio Interface Division of Nanobiomedicine and i-Lab Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou 215123 China

Real-time and objective feedback of therapeutic efficacies would be of great value for tumor treatment. Here, we report a smart Ag2S QD-based theranostic nanoplatform （DOX@PEG-Ag2S） obtained by loading the anti-cancer drug doxorubicin （DOX） into polyethylene glycol-coated silver sulfide quantum dots （PEG-Ag2S QDs） through hydrophobic-hydrophobic interactions, which exhibited high drug loading capability （93 wt.% of DOX to Ag2S QDs）, long circulation in blood （t1/2 = 10.3 h）, and high passive tumor-targeting efficiency （8.9% ID/gram） in living mice where % ID/gram reflects the probe concentration in terms of the percentage of the injected dose （ID） per gram of tissue. After targeting the tumor tissue, DOX from PEG-AgRS cargoes was selectively and rapidly released into cancer cells, giving rise to a significant tumor inhibition. Owing to the deep tissue penetration and high spatio-temporal resolution of Ag2S QDs fluorescence in the second near-infrared window （NIR-II）, the DOX@PEG-Ag2S enabled real-time in vivo reading of the drug targeting process and therapeutic efficacy. We expect that such a novel theranostic nanoplatform, DOX@PEG-Ag2S, with integrated drug delivery, therapy and assessment functionalities, will be highly useful for personalized treatments of tumors.

关键词： in vivo imaging Ag2S quantum dots second near-infraredwindow fluorescence drug delivery tumor therapy

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Numerical Study of Effect of Compressor Swirling Flow on Combustor Design in a MTE

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Journal of Thermal Science 2017年第4期26卷 349-354页

作者： MU Yong WANG Chengdong LIU Cunxi LIU Fuqiang hu chunyan XU Gang Zhu Junqiang Key Laboratory of Light-duty Gas-turbine Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing 100190 China Institute of Qingdao Light-duty Gas-turbine Qingdao 266000China

An effect of the swirling flow on the combustion performance is studied by the computational fluid dynamics(CFD) in a micro-gas turbine with a centrifugal compressor, dump diffuser and forward-flow combustor. The distributions of air mass and the Temperature Pattern Factor(as: Overall Temperature Distribution Factor-OTDF) in outlet are investigated with two different swirling angles of compressed air as 0° and 15° in three combustors. The results show that the influences of swirling flow on the air distribution and OTDF cannot be neglected. Compared with no-swirling flow, the air through outer liner is more, and the air through the inner liner is less, and the pressure loss is bigger under the swirling condition in the same combustor. The Temperature Pattern Factor changes under the different swirling conditions.

关键词： Combustor CFD Compressor exit flow angle Micro Turbojet Engine (MTE)

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Programmed polymersomes with spatio-temporal delivery of antigen and dual-adjuvants for efficient dendritic cells-based cancer immunotherapy

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Chinese Chemical Letters 2022年第9期33卷 4179-4184页

作者： Hanyong Wang Xinyu Yang chunyan hu Chenlu huang Hai Wang Dunwan Zhu Linhua Zhang Tianjin Key Laboratory of Biomedical Materials Key Laboratory of Biomaterials and Nanotechnology for Cancer ImmunotherapyInstitute of Biomedical EngineeringChinese Academy of Medical Sciences and Peking Union Medical CollegeTianjin 300192China

Since antigen and adjuvant are rapid clearance in vivo,insufficient delivery to induce dendritic cells(DCs)maturation and cross-presentation,as well as limited migration efficiency of DCs to secondary lymph organs,greatly hinders the development of DCs-based ***,PCL-PEG-PCL polymersomes(PCEP-PS)as antigen and adjuvants delivery nanoplatforms(IMO-PS)were well-designed,which can electrostatically adsorb OVA antigen on the surface via DOTAP lipid and effectively encapsulate OVA antigen into the inner hydrophilic cavity to achieve both initial antigen exposure as well as slow and sustained antigen release,incorporate MPLA within the lipid layer to ligate with extracellular TLR4 of DCs as well as encapsulate IMQ in the hydrophobic membrane to ligate with intracellular TLR7/8 of DCs for activating synergistic immune responses via different signaling *** IMO-PS significantly improved antigen uptake,promoted DCs maturation and cytokines *** treated with IMO-PS could enhance migration into draining lymphoid nodes,and eventually induced antigen-specific CD8+and CD4+T cell responses and OVA-specific cytotoxic T lymphocyte(CTL)*** vaccination of EG7-OVA tumor-bearing mice by IMO-PS+DCs significantly extended tumor-free time,effectively suppressed tumor growth,and greatly extended median survival *** strategy may provide an effective nanoplatform for co-delivery antigen and dual-adjuvants in a spatio-temporally programmed manner for DC-based cancer immunotherapy.

关键词： DCs vaccine Immunotherapy Imiquimod MPLA DOTAP OVA

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The barrier river reach identification and classification in the Middle Yangtze River

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Frontiers of Earth Science 2019年第3期13卷 596-613页

作者： Jinwu TANG chunyan hu Xingying YOU Yunping YANG Xiaofeng ZHANG Jinyun DENG Meng CHEN Changjiang Institute of Survey Planning Design and Research Wuhan 430010China hubei Institute of Survey & Design for Water Resources & Water Power Engineering Wuhan 430064China State Key Laboratory of Water Resource and Hydropower Engineering Science Wuhan UniversityWuhan 430072China Key Laboratory of Engineering Sediment Tianjin Research Institute for Water Transport EngineeringMinistry of TransportTianjin 300456China

Adjustments of upstream river regimes are one of the main factors affecting downstream fluvial processes. However, not all adjustments of river regimes will propagate downstream. There are some distinctive river reaches where upstream and downstream adjustments have no relevance. However, the irrelevance is neither caused by different river types nor by the different conditions of water and sediment;but rather, the channel boundaries and riverbed morphologies block the propagation effect. These are referred to here as the barrier river reach phenomena. The migration of the thalweg line is the essential reason for causing the propagation effect. Numerous influencing factors for thalweg migration exist, including 1) the average flow rate above the critical bankfull discharge, the average flow rate below the critical bankfull discharge, and their ratio, 2) the ratio of the duration of the aforementioned two periods, 3) the thalweg displacement at the entrance of the river reach, 4) the deflecting flow intensity of the node, 5) the ratio of the river width to water depth, 6) the relative width of the floodplain, and 7) the Shields number. In this study, the correlativity between the measured distances and the restricting indicators of thalweg migration in the Middle Yangtze River over the years was established. The barrier degree of 27 singlethread river reaches was subsequently assessed. These reaches included 4 barrier river reaches;5 transitional reaches transforming from barrier to non-barrier;10 transitional reaches transforming from non-barrier to barrier;and 8 non-barrier river reaches. Barrier river reaches were found to be important for maintaining the stability of the river regime and the transverse equilibrium of sediment transport in the downstream reaches. To some extent, the barrier river reaches may protect the natural dynamical properties from being destroyed by artificial river regulation works. Thus, they are of great significance for river management.

关键词： the barrier river reach Yangtze River channel adjustment thalweg migration identification and classification

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