Article
Engineering, Aerospace
Xiaosi Li, Kai Pang, Xinyan Li
Summary: In this paper, the effects of submerged nozzle geometry on nozzle damping characteristics are numerically studied. The numerical method is verified using experimental data, and sensitivity analysis and monitor position independence analysis are performed. The results show that nozzle cavity size, convergent angle, and divergent angle significantly affect nozzle damping. Additionally, an increase in working temperature leads to an increase in the nozzle decay coefficient, thus increasing the damping force.
Article
Engineering, Aerospace
Weiqiang Huang, Chunguang Wang, Kaining Zhang, Zhihong Wang, Weiping Tian
Summary: Nozzle ablation is crucial for the performance of solid rocket motor. In this study, a two-dimensional axisymmetric model of a ground state and vacuum state nozzle before and after ablation was constructed based on a reference profile to investigate the influence of ablation on motor performance. The change in pressure, temperature, and velocity with ablation was studied, and the comprehensive performance of the nozzle was calculated. The results showed that ablation altered the shock wave distribution and introduced new internal shock waves, leading to changes in flow direction, velocity, pressure, and temperature. After ablation, the nozzle outlet temperature and pressure increased, while the velocity, total thrust, and specific impulse decreased.
Article
Engineering, Aerospace
Wang Liwu, Tian Weiping, Chen Linquan, Guo Yunqiang
Summary: The study found that the erosion rate of the nozzle throat in a solid rocket motor is significantly higher in the acceleration direction compared to the non-overload direction. As lateral overload increases, there is a sharp and nearly linear rise in the nozzle throat's deviant ablation.
INTERNATIONAL JOURNAL OF AERONAUTICAL AND SPACE SCIENCES
(2021)
Article
Engineering, Aerospace
Junlong Wang, Ningfei Wang, Xiangrui Zou, Wei Dong, Chao Wang, Lei Han, Baolu Shi
Summary: The accumulation of slag in solid rocket motors has a significant impact on engine safety. This study investigates the characteristics and influencing factors of slag deposition through experiments and numerical simulation. A deposition prediction model is developed to explore the effects of burning surface regression, particle size, detaching position, and nozzle structure. The results indicate that these parameters play a crucial role in slag accumulation.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Aerospace
Hui Tian, Zhongshuo Wang, Zihao Guo, Ruipeng Yu, Guobiao Cai, Yuanjun Zhang
Summary: Metal and metalloid solid-fuel additives can significantly enhance the performance of hybrid rocket motors, but they also increase the ablation rate of the nozzle. This study investigates the impact of aluminum, boron, and aluminum hydride additives on the performance and nozzle ablation in a lab-scale hybrid rocket motor. The results show that aluminum has a superior regression rate improvement compared to aluminum hydride, while the combustion performance of boron as an additive is inferior to aluminum and aluminum hydride.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Aerospace
Xiangrui Zou, Ningfei Wang, Lei Han, Taotao Bai, Kan Xie
Summary: The study aims to determine the behaviors of regression rate and thrust regulation of a combined solid rocket motor capable of achieving energy management. A numerical model was developed to capture the combustion process and regression rate, showing relatively high combustion efficiency. Parametric study indicates that increasing oxidizer mass flow rate leads to higher regression rates and surface temperature of solid grain, while increasing inner diameter of grain hole results in reductions of these parameters.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Polymer Science
Lvtao Zhu, Jiayi Wang, Wei Shen, Lifeng Chen, Chengyan Zhu
Summary: In this study, a finite element analysis of the connector in solid rocket motor cases (SRMC) was performed. The design and optimization of the connector were studied, resulting in weight reduction and improved performance. The comparison between the calculation and test results suggests that the design was reasonable and within the allowable range.
Article
Engineering, Multidisciplinary
Ji-Yeul Bae, In Sik Hwang, Yoongoo Kang
Summary: This study investigates the effect of alumina film deposition with different lateral film speeds on the ablation of internal insulation. Experimental and simulation results show the characteristics of alumina-induced ablation and how the ablation velocity changes with jet velocities. The study also reveals the impact of different jet velocities on the efficiency of the ablation reactions.
DEFENCE TECHNOLOGY
(2023)
Article
Engineering, Aerospace
Hui Tian, Xianzhu Jiang, Yudong Lu, Yu Liang, Hao Zhu, Guobiao Cai
Summary: This paper investigates the effect of rotation, mid-chamber length, and segmented position on fuel regression rate and combustion efficiency in hybrid rocket motors with star-segmented grains. The results show that the segmented rotation grain configuration can improve the combustion flow field structure and increase both fuel regression rate and combustion efficiency. The findings of this research provide valuable guidance for the performance improvement of hybrid rocket motors with star grain.
Article
Thermodynamics
Hanqing Xia, Ningfei Wang, Junsen Yang, Yi Wu
Summary: The dynamic mixing combustion characteristics in variable thrust hybrid rocket motors (HRMs) have been investigated using a two-dimensional transient numerical model. The model accurately predicts the regression behavior of fuel grains in HRMs and simulations of variable thrust processes were performed. The results show that recirculation zones directly affect the temperature distribution and fuel regression rate along the axial direction. Fluctuations in the fuel regression rate and a decrease in combustion efficiency were observed during the thrust variation process. A slight thrust loss was observed at all stages of the variable thrust process.
COMBUSTION AND FLAME
(2023)
Article
Engineering, Aerospace
Junlong Wang, Ningfei Wang, Xiangrui Zou, Wei Dong, Yintao Zhou, Dingjiang Xie, Baolu Shi
Summary: This study investigates the characteristics and influencing factors of aluminum combustion efficiency in solid rocket motors through experiments and numerical simulations, providing guidance for engine performance improvement.
CHINESE JOURNAL OF AERONAUTICS
(2023)
Article
Engineering, Aerospace
Xianzhu Jiang, Hui Tian, Guang Tan, Sheng Zhao, Guobiao Cai
Summary: This paper investigates the ablation characteristics of different nozzle materials in hybrid rocket motors using both firing tests and numerical simulations. The results show different erosion rates for different materials and identify the factors contributing to circumferentially uneven ablation. The numerical simulations provide insights into the evolution of nozzle profile and flow field structure, as well as the coupling effects between erosion rate and nozzle profile.
Article
Engineering, Aerospace
James Meier, John Reynolds, Sean Whalen, Jaimin Patel, Michael J. J. Bortner, Gregory Young
Summary: In this study, polypropylene solid fuel grains were modified by infusing them with gels based on Jet-A. The gel-infused grains exhibited significant improvements in pressure and combustion performance compared to traditional fuel grains.
JOURNAL OF PROPULSION AND POWER
(2022)
Article
Engineering, Aerospace
Dong-Sung Ha, Hong Jip Kim
Summary: To effectively utilize propulsion energy, it is necessary to develop technology that allows for variable thrust in a solid rocket motor by altering the nozzle throat area in real-time. This study designed an altitude compensation nozzle technology, an aerospike-shaped pintle nozzle, to improve performance compared to existing pintle nozzles. Various tests were conducted to validate the design code and numerical models, and the results have the potential to enhance the high-altitude operation performance and precision thrust control of guided missile systems.
Article
Engineering, Aerospace
Xinyou Shan, Yingkun Li, Xiong Chen, Yan Wu, Yong He, Weixuan Li
Summary: The study on the internal ballistic characteristics of the pasty propellant rocket engine reveals the impact of ignition delay time, transport pipeline structure, combustion chamber volume, and pasty propellant flow velocity on the engine performance. The results indicate that optimizing these parameters can improve internal ballistic properties.
INTERNATIONAL JOURNAL OF AEROSPACE ENGINEERING
(2021)
Article
Engineering, Aerospace
Dekun Yan, Guoqiang He, Fei Qin, Duo Zhang, Lei Shi
Article
Engineering, Aerospace
Shuai Wang, Guo-qiang He, De-kun Yan, Zhi-wei Huang, Fei Qin
Article
Thermodynamics
Fei Qin, Ashish Shah, Zhi-wei Huang, Li-na Peng, Per Tunestal, Xue-Song Bai
COMBUSTION AND FLAME
(2018)
Article
Thermodynamics
Donggang Cao, Guoqiang He, Fei Qin, Dan Michaels
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2019)
Article
Thermodynamics
W. Q. Li, H. Wan, T. T. Jing, Y. B. Li, P. J. Liu, G. Q. He, F. Qin
APPLIED THERMAL ENGINEERING
(2019)
Article
Chemistry, Physical
Bing Liu, Guo-Qiang He, Fei Qin, Jian An, Shuai Wang, Lei Shi
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2019)
Article
Thermodynamics
Jiang Li, Gen Zhu, Oupeng Yan, Weipeng Li, Shikong Zhang, Fei Qin
APPLIED THERMAL ENGINEERING
(2019)
Review
Engineering, Aerospace
Lei Shi, Guojun Zhao, Yiyan Yang, Da Gao, Fei Qin, Xianggeng Wei, Guoqiang He
PROGRESS IN AEROSPACE SCIENCES
(2019)
Article
Energy & Fuels
Rui Li, Guoqiang He, Fei Qin, Christoffer Pichler, Alexander A. Konnov
Article
Chemistry, Physical
Bing Liu, Jian An, Fei Qin, Guo-Qiang He, Duo Zhang, Su-li Wu, Lei Shi, Rui Li
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2019)
Article
Chemistry, Physical
Duo Zhang, Donggang Cao, Guoqiang He, Bing Liu, Fei Qin
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2019)
Article
Chemistry, Physical
Bing Liu, Jia-chen Xu, Fei Qin, Guo-qiang He, Duo Zhang, Lei Shi
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Chemistry, Physical
Jian An, Hanyi Wang, Bing Liu, Kai Hong Luo, Fei Qin, Guo Qiang He
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Chemistry, Physical
Jian An, Guoqiang He, Kaihong Luo, Fei Qin, Bing Liu
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Engineering, Multidisciplinary
Rui Li, Guo-qiang He, Fei Qin, Xiang-geng Wei, Duo Zhang, Ya-jun Wang, Bing Liu
JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A
(2019)
Article
Chemistry, Physical
Jie Sheng, Jingshan He, Dun Ma, Yuanbo Wang, Wu Shao, Tian Ding, Ronghao Cen, Jingwen He, Zhihao Deng, Wenjun Wu
Summary: This study presents an innovative approach to improve the photovoltaic conversion characteristics and stability of perovskite solar cells through carbon electrode interface modification. By in-situ polymerization and carbonization on the surface of nano-graphite, a dendritic structure carbon electrode is formed, reducing the work function and aligning the energy levels with perovskite. This leads to improved charge and hole collection efficiency, resulting in increased photovoltaic conversion efficiency. Furthermore, the modified carbon electrode-based perovskite solar cells exhibit exceptional stability, maintaining high efficiency even without encapsulation.
Article
Chemistry, Physical
Guodong Shi, Jian Song, Xiaoxiao Tian, Tongtong Liu, Zhanjun Wu
Summary: This study demonstrates the improvement of mechanical properties and reduction of coefficient of thermal expansion (CTE) in graphene oxide (GO)/epoxy (EP) nanocomposites by enhancing the interface between GO and EP through functionalization and incorporating rigid-flexible interphases. The results reveal that the SiO2-PEA-GO hybrid exhibits better strengthening and toughening effects, as well as lower CTE, compared to the PEA-GO hybrid due to the presence of rigid-flexible interfaces with higher bonding strength and better energy dissipation mechanisms. Additionally, the nanocomposites with longer polyetheramine (PEA) molecules in the rigid-flexible interphases demonstrate higher strength and toughness, while maintaining a lower CTE. This work provides a promising strategy for constructing adjustable flexible-rigid interfacial structures and offers potential in developing GO/EP nanocomposites with high mechanical properties and low CTE.
Article
Chemistry, Physical
Rafal Janus, Sebastian Jarczewski, Jacek Jagiello, Piotr Natkanski, Mariusz Wadrzyk, Marek Lewandowski, Marek Michalik, Piotr Kustrowski
Summary: In this study, a facile procedure for the synthesis of CMK-1 and CMK-2 carbon replicas was developed. The method utilizes basic laboratory equipment and a renewable carbon source, and operates under mild conditions. The resulting carbon mesostructures exhibit exquisite replication fidelity and structural homogeneity, making them suitable for applications in various fields.
Article
Chemistry, Physical
Anqi Wang, Connor J. MacRobbie, Alex Baranovsky, Jean-Pierre Hickey, John Z. Wen
Summary: In this study, a novel polymer-free nanothermite aerogel with a wide range of nanoparticle loading was fabricated via a new additive manufacturing process. The SEM images showed a unique porous structure formed by extra thin rGO sheets, wrapping individual nanothermite clusters. The DSC-TGA results and high-speed combustion videos confirmed the enhanced energetic performance of the printed specimen.
Article
Chemistry, Physical
Wanze Wu, Misheng Zhao, Shiwei Miao, Xiaoyan Li, Yongzhong Wu, Xiao Gong, Hangxiang Wang
Summary: Superhydrophobic solar-driven interfacial evaporator is an energy-efficient technology for seawater desalination, which is easily fabricated using robust photothermal superhydrophobic coating and substrate. The created bifunctional coating on the melamine sponge substrate shows stable and highly efficient photothermal and superhydrophobic performance for seawater desalination. This superhydrophobic solar-driven interfacial evaporator is expected to have wide applications in seawater desalination.
Article
Chemistry, Physical
Zichen Xiang, Zhi Song, Tiansheng Wang, Menghang Feng, Yijing Zhao, Qitu Zhang, Yi Hou, Lixi Wang
Summary: This study presents a co-electrospinning synthesis strategy to fabricate lightweight and porous Co@C composite nanofibres with wideband microwave attenuation capacity. The addition of MOF-derived Co additives enhances the low-frequency absorption performance.
Article
Chemistry, Physical
J. Snow, C. Olson, E. Torres, K. Shirley, E. Cazalas
Summary: This study investigates the use of a perovskite-based graphene field effect transistor (P-GFET) device for X-ray detection. The sensitivity and responsivity of the device were found to be influenced by factors such as X-ray tube voltage, current, and source-drain voltage. Simulation experiments were conducted to determine the dose rate and energy incident on the device during irradiation.
Article
Chemistry, Physical
Zuzana Jankovska, Lenka Matejova, Jonas Tokarsky, Pavlina Peikertova, Milan Dopita, Karolina Gorzolkova, Dominika Habermannova, Michal Vastyl, Jakub Belik
Summary: This study provides new insights into microwave-assisted pyrolysis of scrap tyres, demonstrating that it can produce microporous carbon black with potential application in xylene adsorption. Compared to conventional pyrolysis, microwave pyrolysis requires less time and energy while maintaining similar adsorption capacity.
Article
Chemistry, Physical
Max Bommert, Bruno Schuler, Carlo A. Pignedoli, Roland Widmer, Oliver Groning
Summary: A detailed understanding of the interaction between molecules and two-dimensional materials is crucial for incorporating functional molecular films into next-generation 2D material-organic hybrid devices. This study compares the energy level alignment of different-sized fullerenes on a Moire superstructure and finds that C-84 fullerenes can be either neutral or negatively charged depending on slight variations of the electrostatic potential. This discovery suggests a new path to achieve ambipolar charge transfer without overcoming the electronic gap of fullerenes.
Article
Chemistry, Physical
Yuanjing Cheng, Xianxian Sun, Ye Yuan, Shuang Yang, Yuanhao Ning, Dan Wang, Weilong Yin, Yibin Li
Summary: The dual-structure aerogel (GS) consisting of flexible silica fibers and graphene honeycomb structures exhibits excellent resilience, flexibility, and reliability. It also shows remarkable wave absorbing performance, making it an ideal candidate for microwave absorption applications such as flexible electronics and aerospace.
Article
Chemistry, Physical
Shuyu Fan, Yinong Chen, Shu Xiao, Kejun Shi, Xinyu Meng, Songsheng Lin, Fenghua Su, Yifan Su, Paul K. Chu
Summary: Graphene coatings are promising solid lubrication materials due to their mechanical properties. This study presents a new method for in situ deposition of high-quality graphene coatings on hard substrates using NiCo solid solution and competitive reaction strategies. The graphene coating deposited on substrates with deep NiCo solid solution demonstrates superior low-friction and durability.
Article
Chemistry, Physical
Mengdi Wang, Sanyin Qu, Yanling Chen, Qin Yao, Lidong Chen
Summary: The improved thermoelectric properties of conducting polymers are achieved by selectively capturing single-walled carbon nanotubes (SWNTs) in a conducting polymer film, leading to increased carrier mobility and reduced thermal conductivity. The resulting composite film exhibits significantly higher electrical conductivity and lower thermal conductivity compared to films with a mixture of SWNTs. This work provides a convenient and efficient method to enhance the thermoelectric properties of conducting polymers.
Review
Chemistry, Physical
Heng Wei, Weihua Li, Kareem Bachagha
Summary: This article reviews the research progress of carbon nanotube-based microwave absorbing materials (MAMs) in recent years, covering the fundamental theory, design strategies, synthesis methods, and future development directions.
Article
Chemistry, Physical
Chenguang Shi, Junlong Huang, Zongheng Cen, Tan Yi, Shaohong Liu, Ruowen Fu
Summary: This study developed a high-performance Li metal host material, which achieved dendrite-free Li deposition with a low nucleation overpotential and high Coulombic efficiencies through the combination of Ti3C2-g-PV4P sheets and Ag nanoparticles. The full cells assembled with the Li@host anode and LiFePO4 cathode exhibited high discharge capacity and excellent cycling stability, demonstrating a perspective design for future energy storage devices.
Article
Chemistry, Physical
Tomotaro Mae, Kentaro Kaneko, Hiroki Sakurai, Suguru Noda
Summary: A new partial prelithiation method for SiO/C-CNT electrodes was developed, which showed reduced irreversible capacity and achieved high energy densities with good reversibility. The method allows for precise control of the degree of prelithiation and is applicable to various chemistries.