Results 21 to 30 of about 838 (233)

Modeling of Shutdown Process in Liquid Propellant Rocket Engines [PDF]

فصلنامه علوم و فناوری فضایی, 2014
The effects of liquid propellant rocket engines thrust termination transients are important in achieving the launch vehicle’s desired final velocity with the required precision.
M. Shafiey Dehaj, R. Ebrahimi, H. Karimi, A. Jalali, M. Naderi   +4 more
doaj  

Bringing spacecraft into solar-oriented attitude by the measurements of a single-axis angular-rate sensor and an optical solar sensor

Вестник Самарского университета: Аэрокосмическая техника, технологии и машиностроение, 2020
The algorithm of the turn of the spacecraft from an initial arbitrary angular position at an arbitrary angular rate to a solar-oriented attitude is investigated.
M. G. Shipov, A. A. Steklova, A. A. Davydov   +2 more
doaj   +1 more source

A review of vaporization models as design criterion for bipropellant thrust chambers

Авіаційно-космічна техніка та технологія, 2022
In the beginning of liquid propellant rocket engine development, the thrust chamber sizes were obtained, mainly, empirically. With the technological advancements over the years, several approaches have been developed in order to optimize its sizes and ...
Maurício Sá Gontijo
doaj   +1 more source

PECULIARITIES OF COOLING COMBUSTION CHAMBER OF ROCKET ENGINE, WHICH UTILIZE HIGH-TEST PEROXIDE AS AN OXIDIZER

Авіаційно-космічна техніка та технологія, 2017
Interest in storable ecologically friendly propellant has increased recently. One of the reasons for that is convenience in storage, handle and delivery. The most interesting storable propellant for launch vehicles is high-test peroxide with kerosene.  A
Михаил Витальевич Андриевский, Юрий Алексеевич Митиков, Дмитрий Анатольевич Шамровский   +2 more
doaj   +1 more source

Thermal–Mechanical FEM Analyses of a Liquid Rocket Engines Thrust Chamber

Applied Sciences, 2022
The Italian Ministry of University and Research (MIUR) funded the HYPROB Program to develop regeneratively cooled liquid rocket engines. In this type of engine, liquid propellant oxygen–methane is used, allowing us to reach very good performances in ...
Michele Ferraiuolo, Michele Perrella, Venanzio Giannella, Roberto Citarella   +3 more
doaj   +1 more source

Cross‐Scale Hierarchical Targeted Delivery System Based on Small‐Scale Magnetic Robots

Advanced Robotics Research, EarlyView.
This article reviews a cross‐scale hierarchical targeted delivery system that integrates magnetic continuum robots and magnetic microrobots. By combining rapid long‐range navigation with precise microscale targeting, the system overcomes key limitations of single‐scale approaches.
Junjian Zhou, Zhiqiang Chen, Yuanbiao Ma, Zhiqiang Tang, Qianqian Wang   +4 more
wiley   +1 more source

Feline‐Inspired Robot Enabled by Combustion‐Driven Actuators for Agile Motion and High‐Payload Obstacle Traversal

Advanced Science, EarlyView.
Inspired by nature's competitive maneuvers, this study introduces a combustion‐driven soft actuator that powers a multi‐modal “Jump‐and‐Fly Catbot” (JFC). With millisecond response, high‐force output (over 70 times its weight) and precise control (error within 5%), the robot can jump, fly, hover, and escape from challenging environments, achieving ...
Hongkuan Ma, Yang Yang, Zhiguo He, Hongliang Ren, Pengcheng Jiao   +4 more
wiley   +1 more source

Mathematical formulation of the ontology-based selection algorithm for fixed-wing unmanned aerial vehicles

Авіаційно-космічна техніка та технологія
The subject matter of this study is the thermophysical processes occurring in the cooling channels of liquid-propellant rocket engines. The goal of this research is to create an algorithm for optimizing cooling channels. The tasks include formulating the
Iurii Vorobiov, Kateryna Maiorova, Oleksandr Pidlisnyi   +2 more
doaj   +1 more source

Toward the Simulation of Flashing Cryogenic Liquids by a Fully Compressible Volume of Fluid Solver

Fluids, 2022
We present a fully compressible single-fluid volume of fluid (VOF) solver with phase change for high-speed flows, where the atomization of the liquid can occur either by the aerodynamics or by the effect of the local pressure. The VOF approximation among
Daniel Angel Palomino Solis, Federico Piscaglia   +1 more
doaj   +1 more source

The Future of Hydrogen‐Powered Aviation: Technologies, Challenges, and a Strategic Roadmap for Sustainable Decarbonization

Advanced Energy and Sustainability Research, EarlyView.
Hydrogen‐powered aviation offers a transformative pathway to zero‐emission flight by eliminating in‐flight CO2 emissions. Key considerations include propulsion systems (fuel cells and hydrogen combustion), cryogenic storage and insulation challenges, infrastructure and cost barriers, and supply‐chain constraints.
Mubasshira, Md Mahbubur Rahman, Karib Hassan Khan, Md Nizam Uddin, Dewan Hafiz Nabil   +4 more
wiley   +1 more source