Article
Engineering, Aerospace
Yunseok Choi, James F. F. Driscoll
Summary: A computational analysis was conducted to optimize the flowpath geometry of a dual-mode scramjet engine, resulting in improved specific impulse. By varying six parameters, including inlet contraction ratio, fuel injector diameter and number, combustor wall divergence angle, nozzle flap deflection angle, and flight Mach number, the maximum specific impulse was increased to 2296 s in ram mode and 832 s in scram mode. A reduced-order model was used to simulate the finite-rate chemistry of JP-7 fuel and unstart limits, revealing that combustion efficiency and specific impulse decrease when flame strain-out occurs due to high air velocities or when the flame exceeds the combustor length.
JOURNAL OF PROPULSION AND POWER
(2023)
Article
Engineering, Aerospace
Yunseok Choi, Michael F. Yost, Evan W. Lerner, James F. Driscoll
Summary: This study used the MASIV reduced-order model to compute ways to improve the performance of a dual-mode scramjet engine within a generic X-51 hypersonic vehicle. Two new aspects were added, including the finite-rate chemistry of a hydrocarbon fuel and quantifying tradeoffs due to the short vehicle length. Varying parameters such as fuel-air equivalence ratio, Mach number, fuel injector diameter, and number of fuel injectors, results showed the effect of fuel injector size on the operating ranges of ram and scram modes. The study highlights the importance of considering the mixing-reaction-strain tradeoff in the design process and proposes a solution using different sizes of wall injectors.
JOURNAL OF PROPULSION AND POWER
(2022)
Article
Chemistry, Applied
Stanislaw Szwaja, Michal Gruca, Michal Pyrc
Summary: This paper presents the investigation results on a new type of renewable fuel for automotive and power industry. The ethanol-glycerol blend at the ratio of 3:1 is found to be a feasible substitute for gasoline or ethanol in internal combustion engines, with comparable toxic emissions levels and less than 3% deterioration in engine performance.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Applied
Longjin Du, Jianzhong Liu, Binghong Chen, Zexu Li, Wei Juan Yang
Summary: In this study, B/EtOH/JP-10 suspension fuels with different EtOH contents were prepared and their ignition and combustion characteristics were investigated. The results show that the addition of EtOH changes the ignition pattern of B/JP-10 suspension fuel, shortening its ignition delay. EtOH enhances the microburst of fuel droplets in the early stage of combustion, improving the utilization of oxygen, and gradually breaks the agglomerates, promoting the contact between active boron and oxygen, thereby improving the overall energy release efficiency of the fuel.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Thermodynamics
Yushu Jin, Suyi Dou, Xu Wang, Qingchun Yang, Xu Xu, Lun Pan
Summary: Hydrocarbon fuel loaded with highly energetic nanoparticles has superior energy density and potential to improve scramjet engine performance. The addition of nanoparticles increases combustion temperature and results in solid deposition on the engine inner surface. Studies indicate that in slurry fuel cases, convective heat transfer coefficients are 28.74% higher than in pure fuel cases, leading to higher heat flux.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
LongJin Du, Jianzhong Liu, Binghong Chen, ZhiHao Sun, WeiJuan Yang
Summary: In this study, the surfaces of boron nanoparticles were modified by coating with LiF and AP to enhance the combustion performance and energy release. The effects of coating amount on the ignition temperature and burning intensity were investigated through thermogravimetric and laser ignition experiments.
COMBUSTION AND FLAME
(2023)
Article
Thermodynamics
Xu Wang, Yuxin Yang, Yongqi Liu, Xu Xu, Qingchun Yang
Summary: This study introduces a pioneering methodology predicated on secondary combustion to augment the thrust of air-breathing vehicles operating at high flight Mach numbers. The study involved theoretical calculation and parametric design to analyze the performance of a Mach 8 scramjet engine with an afterburner. The results demonstrate the advantageous correlation between heightened powder-to-gas ratios and augmented thrust production.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2024)
Article
Thermodynamics
Erdal Cilgin, Halis Deviren, Orhan Arpa
Summary: This research found that using a low percentage of acetone in diesel engines leads to improvements in combustion parameters, while increasing acetone concentration and using acetone + MNMgOs has the opposite effect. Combining acetone and MNMgOs can effectively reduce emissions of CO, HC, and NOx.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Engineering, Chemical
Longjin Du, Binghong Chen, Jianzhong Liu, Tingting Wu, Weijuan Yang
Summary: Al/JP-10 nanofluid fuel suffers from agglomeration and sedimentation, but this study improves the stability of the fuel system by modifying aluminum nanoparticles with different surfactants. The effects of surfactant molecules' carbon chain length, unsaturated bond, and adsorbent structure on the stability of the fuel system were examined for the first time from a molecular perspective. Span-65 modified aluminum nanoparticles (1 wt %) were found to be highly stable, and the mechanism by which Span-65 improves stability was proposed.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Aerospace
Damian Curran, Vincent Wheatley, Michael Smart
Summary: This paper discusses the efficient propulsion of the second stage of an access to space system using accelerated scramjet engines, and the performance implications of geometric features required for acceleration from Mach 5 to 10. An injection scheme for high Mach number operation of the accelerator scramjet is introduced, and its performance at on- and off-design conditions is categorized. The full-scale engine generates thrust at Mach 10 despite a reduced area-ratio nozzle, although a reduction of inlet fueling is required at scale.
JOURNAL OF SPACECRAFT AND ROCKETS
(2023)
Article
Engineering, Aerospace
Peixi Guo, Xiaowei Li, Nidal H. Abu-Hamdeh, Rashad A. R. Bantan
Summary: The fuel mixing efficiency of a transverse hydrogen multi-jet with lobe-shape nozzle was investigated in this study. The results showed that the application of a 3-lobe injector enhanced fuel mixing and penetration more than other nozzles. Fuel mixing was found to be directly associated with the power of the upstream vortex generated nearby the first injector.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Energy & Fuels
Binghong Chen, Shiquan Shan, Jianzhong Liu
Summary: In this study, metal hydride was introduced into B/JP-10 suspension fuel to enhance its combustion characteristics. The addition of LiH showed the best performance, reducing the initial reaction temperature of boron and increasing the oxygen content in the residue. Thermodynamic calculations revealed the promotion mechanism of LiH on the energy release of the suspension fuel.
Article
Energy & Fuels
B. Karpanai Selvan, Soni Das, M. Chandrasekar, R. Girija, S. John Vennison, N. Jaya, P. Saravanan, M. Rajasimman, Yasser Vasseghian, N. Rajamohan
Summary: The study investigates the performance and emission characteristics of various biomass blends in a diesel engine. The results show that the AO10D blend performs well with higher thermal efficiency and lower emissions at 50% load.
Article
Chemistry, Physical
Rui Gu, Mingbo Sun, Zun Cai, Peibo Li, YiZhi Yao
Summary: This study develops an empirical fuel distribution model to describe non-uniform combustion in scramjet engines. Results show that scramjet thrust is closely related to fuel equivalence ratio and combustion efficiency, with different fuel distribution within the combustor affecting engine performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Aerospace
Suneetha Lakka, Pitambar Randive, K. M. Pandey
Summary: The study compares the combustion characteristics of combustors with and without cavities and investigates the impact of cavity parameters on the performance of a strut-based scramjet combustor. The research reveals the formation of a strong recirculation zone in the cavity region, improving mixing and combustion efficiency.
Article
Chemistry, Physical
Qingchun Yang, Wen Shi, Juntao Chang, Wen Bao
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2015)
Article
Engineering, Aerospace
Youhai Zong, Wen Bao, Juntao Chang, Jichao Hu, Qingchun Yang, Jian Song, Meng Wu
JOURNAL OF AEROSPACE ENGINEERING
(2015)
Article
Engineering, Aerospace
Qingchun Yang, Khaled Chetehouna, Nicolas Gascoin, Wen Bao
Article
Chemistry, Physical
Qingchun Yang, Youhai Zong, Wen Bao
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2016)
Article
Engineering, Aerospace
Shaohua Zhu, Xu Xu, Qingchun Yang, Yushu Jin
AEROSPACE SCIENCE AND TECHNOLOGY
(2018)
Article
Thermodynamics
Shaohua Zhu, Xu Xu, Qingchun Yang
APPLIED THERMAL ENGINEERING
(2018)
Article
Engineering, Aerospace
Yushu Jin, Xu Xu, Qingchun Yang, Shaohua Zhu
AEROSPACE SCIENCE AND TECHNOLOGY
(2019)
Article
Thermodynamics
Yushu Jin, Suyi Dou, Xu Wang, Qingchun Yang, Xu Xu, Lun Pan
Summary: Hydrocarbon fuel loaded with highly energetic nanoparticles has superior energy density and potential to improve scramjet engine performance. The addition of nanoparticles increases combustion temperature and results in solid deposition on the engine inner surface. Studies indicate that in slurry fuel cases, convective heat transfer coefficients are 28.74% higher than in pure fuel cases, leading to higher heat flux.
APPLIED THERMAL ENGINEERING
(2021)
Article
Engineering, Aerospace
Yushu Jin, Xu Xu, Qingchun Yang, Suyi Dou, Xu Wang, Qingfei Fu, Lun Pan
Summary: Using boron particles as an additive to hydrocarbon gel fuels is an effective way to improve the performance of scramjet/ramjet systems. Experimental studies have shown that boron-containing gel fuel can achieve stable combustion and has higher combustion efficiency and specific impulse than gel fuel without boron particles. However, the addition of boron particles may cause wall deposition phenomenon and increase wall heat flux.
Article
Mechanics
You Wu, Xu Xu, Bing Chen, Qingchun Yang
Summary: The study investigates the applicability of the binary scaling law in hypersonic flow fields and explores the reasons for its failure through theoretical analysis and numerical simulation. The results indicate that the failure of the binary scaling law is mainly caused by three-body collision reactions and energy exchange between electrons and ions.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Thermodynamics
Qingchun Yang, Xu Wang, Xu Xu, Jiaxun Liu, Yang Yu
Summary: Experiments were conducted to investigate the effects of magnesium particle size on the combustion characteristic of a Mg-CO2 Martian ramjet. The results showed that finer magnesium particles had a wider range of equivalence ratio adaptation, higher combustion efficiency, and less condensed phase deposition. The condensed phase product produced by the combustion of finer magnesium particles was mainly magnesium oxide.
Article
Engineering, Aerospace
Yang Qingchun, Bao Wen, Chetehouna Khaled, Zhang Silong, Gascoin Nicolas
CHINESE JOURNAL OF AERONAUTICS
(2017)
Article
Thermodynamics
Hongxin Wang, Qingchun Yang, Xu Xu
APPLIED THERMAL ENGINEERING
(2017)
Article
Thermodynamics
Nicolas Gascoin, Qingchun Yang, Khaled Chetehouna
APPLIED THERMAL ENGINEERING
(2017)
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.
