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Article
Multidisciplinary Sciences
Reza Iranmanesh et al.
Summary: Due to the importance of protecting the forebody of a scramjet from severe aerodynamic heating during hypersonic flight, a new cooling system is proposed and investigated in this study. Computational fluid dynamics is used to simulate the lateral and axial coolant jets released from the spike at high-velocity conditions. The primary goal is to find the optimal location for efficient cooling of the nose and spike assembly. The influence of two coolant jets (Carbon dioxide and Helium) on the cooling system mechanism is fully investigated, and different jet configurations are explored to achieve efficient protection for the nose cone during hypersonic flight. Our results show that the presence of the spike on the nose cone decreases pressure on the main body by up to 33% and shifts the maximum pressure to higher angles. The injection of the coolant disk jet at an angle of 55 deg leads to a drop of about 50% in maximum pressure.
SCIENTIFIC REPORTS
(2023)
Article
Energy & Fuels
Long Liu et al.
Summary: In this article, numerical simulations were conducted to investigate the developing process of large nozzle spray and flame in a constant volume combustion chamber. The effects of nozzle diameter, ambient pressure, and swirl on spray and flame characteristics were analyzed. The results showed that the large nozzle diameter affected the evaporation and propagation of the flame, while increasing ambient pressure and adding swirl accelerated the spray break-up and enhanced the combustion process.
Article
Engineering, Marine
Jun Liang et al.
Summary: This study develops two approaches to construct simplified numerical models for accurately and efficiently simulating the dynamic behaviors of monopile-supported offshore wind turbines (OWTs). The models are based on full-order finite element models and utilize decomposition and truncation techniques. Model updating is used to improve accuracy and the results show excellent agreement with the full-order model.
Article
Mechanics
Xiaoling Shi et al.
Summary: Comprehensive computational investigations have been conducted to examine the role of an annular air jet on fuel mixing in the combustion chamber. The results show that the injection of the annular jet can enhance circulations and improve fuel mixing inside the chamber.
Article
Multidisciplinary Sciences
Yunbin Shi et al.
Summary: The main challenge in advancing high-speed automobiles is aerodynamic heating. This study extensively investigates the use of lateral jet for thermal protection. Computational fluid dynamic simulation is used to study the lateral coolant jet at high-velocity conditions. The goal is to find the optimal jet configuration to reduce aerodynamic heating. Different coolant jets (Helium and Carbon dioxide) are investigated and their flow characteristics and fuel penetration mechanisms are analyzed. The thermal load on the nose cone is compared for different configurations. Results show that injecting lateral jet near the spike tip effectively protects the main body by deflecting the bow shock. Carbon dioxide jet with lower diffusivity is more effective in protecting the forebody from severe aerodynamic heating.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
Sida Li et al.
Summary: This study examines the influence of a non-uniform magnetic field on the thermal efficiency of Fe3O4 nanofluid streaming inside the U-turn pipe of solar heat exchangers. Computational fluid dynamic is employed to visualize the nanofluid flow and investigate the impact of magnetic intensity and Reynolds number on thermal efficiency. The usage of magnetic field produces vortex in the base fluid and significantly improves heat transfer efficiency, particularly with Mn=25 K.
SCIENTIFIC REPORTS
(2023)
Article
Thermodynamics
Tao Hai et al.
Summary: The objective of this study is to model the emission characteristics of hydrogen-enriched natural gas engines (HENGEs) using the multilayer perceptron neural network (MLPNN) and multi-output least squares support vector regression (MLS-SVR) methods. The MLS-SVR algorithm outperforms the MLPNN in accurately predicting the emissions of methane, carbon monoxide, and NOx. The MLS-SVR estimates the experimentally-measured emissions with an average relative deviation of 3.55%, 3.30%, and 4.22% for methane, carbon monoxide, and NOx, respectively.
Article
Thermodynamics
Lianghua Ma et al.
Summary: The mechanism of fuel injection and system of fuel mixing play a crucial role in the combustion process of scramjet engines. This study focuses on the injection of fuel from the side section of the strut inside the combustion chamber. The research investigates the fuel spreading and diffusion when the fuel jet is released in the spanwise direction, as well as the effect of injection height on the side section of the strut.
Article
Energy & Fuels
Gautam Choubey et al.
Summary: The shape of the struts significantly affects the combustion mechanism in scramjet engines. Researchers have found that a semi-circular trailing edge half-wedge strut is the most effective configuration, ensuring better combustion performance. Increasing the inward fuel injection angle improves the mixing performance of the two-strut scramjet combustor.
Article
Engineering, Aerospace
Jianglong Yu et al.
Summary: Cooperative guidance issues with impact time consensus against a maneuvering target are studied in this article. The expected impact time is not predesigned and is coordinated by multiple missiles using neighboring information. A maximum consensus algorithm is used to generate the impact time consensus command. An analytical cooperative guidance law with bias proportional guidance form is proposed, and the convergence and stability of the algorithm and guidance law are analyzed. A experimental platform is constructed to test the performance of the proposed cooperative guidance strategy, and numerical simulation and experimental results are presented to verify its effectiveness.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2023)
Article
Thermodynamics
Shanshan Shang et al.
Summary: In this research, the usage of an extruded annular nozzle for fuel mixing in the combustion chamber was investigated. The focus was on studying the flow of the fuel jet using three-dimensional simulation. The study connected the mass diffusion mechanism with the fuel mixing of the jet released from the extruded nozzle. The results showed that injecting fuel through the extruded nozzle improved fuel mixing performance in the combustor, especially with the use of coaxial fuel and air jets.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Aerospace
Shan-shan Tian et al.
Summary: This paper introduces the use of bump passive control approach to mitigate the shock wave/boundary layer interaction problems in supersonic and hypersonic vehicles. By optimizing the configuration, the performance of the vehicle is improved in terms of minimum separation area and maximum total pressure recovery coefficient. The Kriging model and NSGA-II algorithm are employed to establish the optimized model and analyze the flow field structures. The results show that the optimized model performs better than the baseline condition, with a larger total pressure recovery coefficient and a smaller separation area.
Article
Mechanics
Armin Sheidani et al.
Summary: In this study, the effect of icing phenomenon on the wake characteristics of a vertical-axis wind turbine (VAWT) was investigated using high-fidelity computational fluid dynamics simulation. The results showed that icing caused the leading edge vortex and trailing edge vortex to separate faster, resulting in a steeper drop in the power coefficient. The modes of the transversal component of velocity in clean and icy conditions were found to be more similar, while the modes of the streamwise component showed significant differences.
Article
Multidisciplinary Sciences
Seyyed Amirreza Abdollahi et al.
Summary: The efficient injection system plays a crucial role in the implementation of air breathing propulsion systems at supersonic flow. This research investigates the use of extruded multi-injectors in fuel distribution and mixing through the combustor. By visualizing the role of vortices formed near the injectors, it is found that extruded nozzles significantly enhance fuel jet diffusion in the scramjet's combustor.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Multidisciplinary
Menglin Li et al.
Summary: This article proposes a wind speed correction method to improve the accuracy of short-term wind power forecast. By using a hidden Markov model, the method explores the characteristics of wind speed forecast errors and optimizes the emission probability using kernel density estimation. Experimental results show that the proposed method outperforms traditional methods in wind power forecasting.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2022)
Article
Engineering, Multidisciplinary
Caijiang Lu et al.
Summary: This paper proposed a split-core magnetoelectric current sensor with high detection sensitivity and stability for wireless measurement of 50 Hz current. The novel design concept provides a new idea for online current monitoring of the Internet of Things in power systems.
Article
Engineering, Aerospace
Dawen Shen et al.
Summary: The integration of nozzle guide vanes into the rotating detonation combustor enhances the detonation strength and pressure gain capability, resulting in greater thrust potential for the turbine engine. A new shock structure is identified, which prevents the typical unstarting issue for turbines.
Article
Multidisciplinary Sciences
Jun Wang et al.
Summary: In this study, a parallel robot equipped with a constant force actuator for grinding applications was designed. The characteristics of the robot's spatial positions and poses were analyzed using DH parameters and geometric methods. The workspace for grinding objects was found to be a cylindrical shape with a cross section similar to a symmetric circular sector. The forces produced by the robot system were analyzed using the Newton-Euler method, and the rationality of the force decoupling design was verified. The theoretical analyses were confirmed through theoretical calculations, simulations, and experimental analyses, providing a theoretical foundation for the design, manufacture, and control of the proposed parallel robot system.
Article
Engineering, Aerospace
Sheng-yi Wang et al.
Summary: The mixing process between the fuel and air is crucial for the efficient operation of the scramjet engine, and a coaxial injector has been developed and investigated to enhance the mixing process. Numerical approaches have validated the effectiveness of the coaxial injector, showing that it induces a quicker mixing process and has a promising potential for the scramjet engine. The results also indicate that the jet-to-crossflow pressure ratio has a minimal impact on the total pressure recovery coefficient.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Computer Science, Interdisciplinary Applications
Amin Hassanvand et al.
Summary: The study investigates the effects of multiple hydrogen jets on an inclined surface in supersonic airflow, finding that mixing performance improves at high jet pressure and with increasing angle of the exterior surface. The study also highlights the significant impact of power and slant of the separation shock on the size of the mixing zone.
INTERNATIONAL JOURNAL OF MODERN PHYSICS C
(2021)
Article
Thermodynamics
Zhilong Cheng et al.
Summary: This study examines the effects of methane and oxygen injection concentrations on sintering performance, showing that high methane concentration can expand the melting zone and increase the melting quantity index, while low oxygen concentration in the reacting flow can slow down the propagation speed of the melting zone, thus improving local sintering performance.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Physical
Chuan Sun et al.
Summary: Injecting hydrogen jets to enhance the fuel mixing efficiency of a scramjet engine, a recent study found that under specific conditions, high circulation value can be achieved to improve mixing efficiency.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Yuelei Zhang et al.
Summary: The research applies a computational method to examine the impacts of coaxial hybrid air and fuel jets on fuel mixing at supersonic cross-flow, revealing significant improvement in fuel penetration and mixing inside the combustion chamber. The study also confirms that the coaxial injector enhances the spiral feature of the fuel jet, promoting fuel mixing downstream and increasing circulation strength in far away from an injector.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Manufacturing
Mehdi Zamani et al.
Summary: This study investigated the use of Ultrasonic Assisted Turning (UAT) to create microtextures on titanium implants to enhance cell adhesion. The effects of microtextures on cell adhesion behavior were analyzed through theoretical relations and graphical modeling. Results showed that UAT can improve the adhesion properties of implants for osteoblast cells, with no significant change in surface roughness.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2021)
Article
Engineering, Aerospace
Yu Jiang et al.
Summary: This article investigates the fuel injection system in supersonic vehicles, focusing on the use of a trapezoidal strut injector to enhance fuel mixing. The strength of vortices is influenced by injector velocity and free stream conditions, with the results showing an 18% improvement in fuel mixing when using a trapezoidal strut injector.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Aerospace
Yicheng Li et al.
AEROSPACE SCIENCE AND TECHNOLOGY
(2020)
Article
Chemistry, Physical
Tran Dinh Manh et al.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Computer Science, Interdisciplinary Applications
F. Pish et al.
INTERNATIONAL JOURNAL OF MODERN PHYSICS C
(2020)
Review
Chemistry, Physical
Gautam Choubey et al.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Review
Chemistry, Physical
Gautam Choubey et al.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Engineering, Aerospace
Wei Huang et al.
Article
Engineering, Aerospace
Zhixiong Li et al.
AEROSPACE SCIENCE AND TECHNOLOGY
(2020)
Article
Chemistry, Physical
Xinglong Liu et al.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Engineering, Manufacturing
Masoud Farahnakian et al.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2019)
Review
Chemistry, Physical
Gautam Choubey et al.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2019)
Article
Thermodynamics
F. Pish et al.
CASE STUDIES IN THERMAL ENGINEERING
(2019)
Review
Engineering, Aerospace
Wei Huang
Article
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Keivan Fallah et al.
AEROSPACE SCIENCE AND TECHNOLOGY
(2018)
Review
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Wei Huang et al.
PROGRESS IN AEROSPACE SCIENCES
(2018)
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Gautam Choubey et al.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2017)
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A. Anazadehsayed et al.
Article
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M. Barzegar Gerdroodbary et al.
Review
Engineering, Aerospace
Wei Huang
AEROSPACE SCIENCE AND TECHNOLOGY
(2016)
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Masoud Farahnakian et al.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2015)
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M. Barzegar Gerdroodbary
Review
Engineering, Multidisciplinary
Wei Huang et al.
JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE A
(2013)
