Article
Engineering, Aerospace
A. S. Melikhov, I. A. Bolodyan, L. T. Tanklevskiy
Summary: This article presents the conceptual conditions of fire-extinguishing in inhabited pressurized compartments of future lunar bases and determines nitrogen to be the most preferable extinguishing agent from technical, economic, and environmental perspectives.
Article
Chemistry, Multidisciplinary
Zhewen Ma, Xiaochen Liu, Xiaodong Xu, Lei Liu, Bin Yu, Cristian Maluk, Guobo Huang, Hao Wang, Pingan Song
Summary: This study presents a biomimetic strategy to design a polymeric coating with strong adhesion and flame-retardant properties, which can self-extinguish during vertical burning and release low heat and smoke, outperforming previous products.
Article
Thermodynamics
Chunxiao Liu, Guoqing Zhu, Bingrui Yan, Guanyu Hou, Chun An
Summary: This study conducted fire extinguishing experiments using two different types of fire extinguishing agents on different types of fires, and measured the changes in the combustion field before and after extinguishing. The results of the experiment showed that the water-based fire extinguishing agent had better effects on reducing the temperature and time of combustion.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Engineering, Civil
T. A. Bolshova, V. M. Shvartsberg, A. G. Shmakov
Summary: This study proposes a numerical simulation method to determine effective mixtures of fire suppressants, saving time and resources. The results demonstrate that at the optimal ratio of fire-suppressant agents, the production rate of H atoms in methane combustion reactions is minimal, while the consumption rate of H in inhibition reactions is maximal.
FIRE SAFETY JOURNAL
(2021)
Article
Chemistry, Physical
Mingyue Wu, Yuntao Liang, Yanyun Zhao, Wei Wang, Xiangming Hu, Fuchao Tian, Zhenglong He, Yongsheng Li, Tongyu Liu
Summary: The developed gel foam integrates foam, gel, and inert gas technologies, achieving excellent fire extinguishing performance by effectively reducing coal temperature and heat radiation to prevent re-ignition.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Engineering, Civil
Bouaza Lafdal, Rabah Mehaddi, Pascal Boulet, Elmehdi Koutaiba, Tarek Beji
Summary: This paper presents a series of 48 enclosure fire experiments conducted in a 1.40 m cubic compartment. A new oscillatory combustion regime is discovered, characterized by alternations between well-ventilated and under-ventilated conditions. This finding calls for a better understanding and further analysis of the underlying physics.
FIRE SAFETY JOURNAL
(2024)
Article
Chemistry, Multidisciplinary
Hong-Seok Yun, Sun-Yeo Mun, Cheol-Hong Hwang
Summary: In this study, experiments and numeric studies were conducted to analyze the causes of abnormal behavior in temperature, heat flux, and combustion efficiency that occurred before a compartment fire was converted to the under-ventilated condition. The results indicated that the abnormal behavior of thermal physical quantities, HRR, and combustion efficiency occurred because fuel that was not burned inside the compartment did not reach the lower combustion limit even outside the compartment and was discharged.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Chemical
Zongqing Tang, Guang Xu, Shengqiang Yang, Jun Deng, Qin Xu, Ping Chang
Summary: Coal spontaneous combustion and coal fire accidents cause resource losses and human casualties. The new fire-retardant foam effectively inhibits free radical production and the spread of coal fires, preventing coal fires and smoldering.
Article
Energy & Fuels
Liang Wang, Zhongyong Liu, Hongyu Yang, Haitao Li, Minggao Yu, Tao He, Zhongzheng Luo, Feng Liu
Summary: The novel biomass composite thermoresponsive gel made of konjac glucomannan and fly ash effectively inhibits coal spontaneous combustion and has good combustion inhibition and fire extinguishing effects. The gel can cover burning coal surfaces well, reducing heat and CO emissions to stably extinguish fires.
Article
Environmental Sciences
Chuandong Liu, Rui Zhang, Zixian Wang, Xiaoqiang Zhang
Summary: Coal gangue, a byproduct of coal mining, can cause slow oxidation and spontaneous combustion, resulting in toxic gases and casualties. Gel foam has been studied for its fire retardant properties in coal mines. The newly developed gel foam showed higher temperature endurance and better extinguishing effect compared to traditional foam and water. The gel foam also had good oxygen barrier properties and rheological stability.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Thermodynamics
Kaili Dong, Junfeng Wang, Yulong Zhang, Zewen Liang, Qi Shi
Summary: A new type of fire-suppression polymer gel with strong stability has been developed to prevent and extinguish mine fires more efficiently. The optimal formula was determined through testing the gelation time and measuring different properties of the gel. The gel was found to have good thermal stability, flowability, and significant effects on suppressing CO emission during coal oxidation.
COMBUSTION SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Meenakshi Rohilla, Amit Saxena, Braham Prakash, Rajesh Kumar Tanwar, Rajiv Narang, Yogesh Kumar Tyagi
Summary: Hematite nanoparticles were synthesized using a facile and eco-friendly hydrothermal method, and their catalytic effect on the performance of aerosol forming composite (AFC) was investigated for the first time. The incorporation of 5% (w/w) nano hematite in AFC reduced the combustion temperature by 11%, and significantly improved the burn rate and combustion efficiency by 30% and 7.5% respectively. Furthermore, the nano hematite aerosols put out the fire quickly in less than 5 seconds. This study is valuable for the development of futuristic ultra-fast fire extinguishants.
Article
Engineering, Multidisciplinary
Dong Wang, Xiaoyu Ju, Xiaodong Zhou, Zhizuan Zhou, Hong Liu, Ping Zhang, Lizhong Yang
Summary: This study investigated the evolution of blue ghosting flame and self-extinguishing behavior in ventilation-controlled compartment fires. The results showed that the flame transformed from stable stage to blue ghosting flame or extinguishment with the increase of total HRR. Combustion spontaneously regulated the oxygen concentration in the compartment and changed the trend of oxygen concentration decreasing with total HRR. The critical HRR for appearance of blue ghosting flame and self-extinguishing increased linearly with the opening factor.
Article
Chemistry, Multidisciplinary
Zhenzhen Jin, Xiao Zhang
Summary: Research and development of new fire-extinguishing agents to replace halon is urgent, and the fire-extinguishing performance and mechanism of octafluorocyclobutane (C4F8, C-318) have not been studied. Experimental measurements and theoretical calculations were performed to evaluate the extinguishing performance of C-318 against methane and propane flames and analyze its reaction mechanism with chain radicals. It was found that C-318 has low minimum extinguishing concentrations for suppressing methane and propane flames, and its feasibility as a fire-extinguishing agent is verified.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Thermodynamics
Mohammad Safarzadeh, Ghassem Heidarinejad, Hadi Pasdarshahri
Summary: This paper examined the effect of combustion model on compartment fire simulation by comparing the results of the flamelet generated manifold (FGM) combustion model with conventional combustion models. It was observed that the application of radiation effect was necessary for the FGM combustion model to accurately predict high heat release rates. The FGM model was able to simulate all toxic species involved in the fire, unlike conventional combustion models which could only model one or two toxic species. The computational cost of the FGM model was also comparable to that of conventional models.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Engineering, Aerospace
A. I. Krikunova, A. D. Cheshko, V. V. Krivets
Summary: Fire safety is crucial for the development of efficient and safe energy systems for space objects. This paper focuses on studying the influence of gravity on combustion processes and analyzes the dynamics of inverted conical methane-air flame under external acoustic excitation. The results show that at high excitation frequencies, the intensity of vortex generation is similar to that observed in experiments with normal gravity, indicating the dominance of acoustic mechanism. Additionally, at an external excitation frequency of 240 Hz, significant growth in shear vortex diameters and increased amplitude of perpendicular oscillations of flame branches were observed, indicating the most intensive large scale instability of flow.
Article
Engineering, Aerospace
Liya Huang, Mingquan Gong, Jiarui Zhang, Kun Liang, He Yang
Summary: Metallized gel propellants with exceptional stability and remarkable shear-thinning properties were successfully synthesized by utilizing cooperative hydrogen bonding between polymer octanoyl cellulose and the small Thixatrol ST molecule.
Article
Engineering, Aerospace
Clemence Poirier, Michelle Hermes, Marco Aliberti
Summary: This paper examines the role of space-based data in European climate policies and assesses the barriers to the use of space technology in climate policymaking in European countries. The research findings indicate that while satellite data is crucial for scientific research and climate policies, the role of space is not accurately reflected in European climate policies.
Article
Engineering, Aerospace
Yan-mei Zhou, Ji-ping Wu, Wei Huang, Gautam Choubey
Summary: This study investigates the combustion performance of sinusoidal pulsed jets in supersonic flows using numerical simulations. It is found that the pulsed jets can significantly improve combustion efficiency.
Article
Engineering, Aerospace
Wang Zhao, Shujun Tan, Yiliang Guo
Summary: This study proposes an adaptive Pogo active suppression controller design method that utilizes measured acceleration as feedback. The eigenspace transformation theory is employed to design dimensional reduced models for observer and adaptive controller, effectively addressing the issues of model parameter uncertainty and time-varying parameters. Simulation analysis of a certain type of rocket demonstrates the effectiveness of the proposed method.
Article
Engineering, Aerospace
A. V. Nebylov, V. A. Nebylov
Summary: This article discusses the safety issues of astronauts during the landing process and investigates how rescuers can effectively carry out rescue missions. The article also takes into account the special maritime conditions of the Vostochny cosmodrome.
Article
Engineering, Aerospace
Pietro Davide Maddio, Rosario Sinatra, Alberto Meschini, Riccardo Rigato, Marco Lapi, Davide Scarozza, Alessandro Cammarata
Summary: This study aims to develop a versatile cable net generation algorithm for designing offset cable nets in parabolic reflectors. The study proposes a methodology that leverages quasi-geodesic curves and introduces two types of these curves. The study also presents various solutions for different cable net layouts and introduces a quality index based on an equilateral triangle cable net.
Article
Engineering, Aerospace
Nahum Melamed, Tom Heinsheimer
Summary: Traditional methods of asteroid trajectory modification rely on impact or nuclear detonation, while centrifugal propulsion offers an alternative approach. The centrifuge system lands on the asteroid and gradually adjusts the trajectory using momentum transfer. This method allows for flexibility in operation parameters and has the potential to be used in planetary defense and other space missions.
Article
Engineering, Aerospace
Andrew Barth, Ou Ma
Summary: As humans continue to explore the surfaces of the Moon and Mars, the use of distributed heterogeneous robot teams can increase the chances of success by utilizing the complementary capabilities and synergy of the team members. Effective cooperation and collaboration between the members of a robot team is crucial, but defining a metric for effective cooperation is challenging. This paper presents a method for determining reward criteria that can be used for training robot swarm through reinforcement learning techniques. The trained robot team exhibits high success rates and cooperative behavior in test environments, demonstrating the robustness and scalability of the training strategies.
Article
Engineering, Aerospace
Kaijie Zhu, Qiquan Quan, Dewei Tang, Yachao Dong, Kaiyi Wang, Bo Tang, Qi Wu, Zongquan Deng
Summary: This study proposes a deployable Mars quadcopter for air patrol and sampling missions. By describing its structure, avionics architecture, and autonomous flight control method, it provides a feasible framework for future Mars flight sampling missions.
Article
Engineering, Aerospace
Avishai Melamed, Adi Rao, Sarah Kreps, Erika Palmer
Article
Engineering, Aerospace
Colin Hunter, Avinkrishnan Vijayachandran, Anthony M. Waas
Summary: Deployable structures inspired by origami have gained significant prominence in space applications. Recent advancements in multi-material additive manufacturing have opened new possibilities for the fabrication of monolithic structures. This paper presents a novel framework for designing deployable structures using viscoelastic hinges incorporated into rigid plates. Experimental results demonstrate the effectiveness and feasibility of these hinge designs in real-world applications.
Article
Engineering, Aerospace
Aleksander V. Efremov, Mikhail S. Tiaglik, Aleksey S. Tiaglik, Iliyas Kh Irgaleev, Tatyana V. Voronka
Summary: Theoretical and experimental studies were conducted to determine the best kind of information presented on a predictive display for the highest accuracy in space mission execution, while considering reduced propellant consumption.
Article
Engineering, Aerospace
Fuwen Liang, Long Miao, Feng Tian, Jiahui Song, Ningfei Wang, Xiao Hou
Summary: This study investigates the influence of deployment friction on the dynamic characteristics of nonconductive space tether through experimental measurement and numerical simulation. The results show that deployment friction significantly limits the uncontrolled tether deployment, while increasing the initial deployment velocity and satellite effective mass, as well as decreasing orbital altitude, can enhance the deployment capability and dynamic stability. In addition, an optimal matching relationship between tether length and satellite total mass is proposed, which is of substantial importance for the design of nonconductive space tether systems.
Article
Engineering, Aerospace
Amirah R. Algethami, Colin R. McInnes, Matteo Ceriotti
Summary: This paper utilizes the Hill's approximation model to manipulate the relative motion of two asteroids by three impulses, resulting in their bound binary motion in Earth's orbit. The feasibility of this strategy is demonstrated, and potential applications for parking small captured near-Earth asteroids in Earth's orbit are discussed.
