Results 1 to 10 of about 2,000 (78)

Effects of the Wall Temperature on Rarefied Gas Flows and Heat Transfer in a Micro-Nozzle [PDF]

Micromachines, 2023
When the satellite is in orbit, the thruster will experience drastic temperature changes (100–1000 K) under solar radiation, which will affect the rarefied gas flow state in the micro-nozzle structure of the cold gas micro-thruster.
Shurui Zhang, Yong Li, Xudong Wang, Songcai Lu, Yusong Yu, Jun Yang   +5 more
doaj   +2 more sources

Direct Simulation Monte Carlo Simulation of the Effect of Needle Valve Structures on the Rarefied Flow of Cold Gas Thrusters [PDF]

Micromachines, 2023
The needle valve, serving as the flow control unit of the thruster system, is a crucial component of the entire thruster. Its performance directly impacts the flow state of the rarefied gas in the micro-nozzle structure of the cold gas micro-thruster ...
Songcai Lu, Xuhui Liu, Xudong Wang, Shurui Zhang, Yusong Yu, Yong Li   +5 more
doaj   +2 more sources

DSMC Simulation of the Effect of Needle Valve Opening Ratio on the Rarefied Gas Flows inside a Micronozzle with a Large Length-to-Diameter Ratio

Aerospace, 2023
The cold gas micro-propulsion system can provide low noise and ultra-high accuracy thrust for satellite platforms for space gravitational wave detection, high-precision earth gravity field measurement.
Xudong Wang, Yong Li, Yong Gao, Chenguang Gao, Weichun Fu   +4 more
doaj   +1 more source

MODELING of Rarefied Gas Flows Inside a Micro-Nozzle Based on the DSMC Method Coupled with a Modified Gas–Surface Interaction Model

Energies, 2023
In this study, we first considered the influence of micro-nozzle wall roughness structure on molecular collision and reflection behavior and established a modified CLL model.
Xuhui Liu, Dong Li, Xinju Fu, Yong Gao, Xudong Wang   +4 more
doaj   +1 more source

Thrust Augmentation of Micro-Resistojets by Steady Micro-Jet Blowing into Planar Micro-Nozzle

Applied Sciences, 2021
The present work investigates the impact of steady micro-jet blowing on the performance of a planar micro-nozzle designed for both liquid micro-thrusters and nitrogen cold-gas micro-resistojets.
Donato Fontanarosa, Maria Grazia De Giorgi, Antonio Ficarella   +2 more
doaj   +1 more source

A Directional Microplasma Thruster Exhibiting a Switchable Intense Plasma Coupling

IEEE Access, 2020
Conventional cold and warm gas thrusters with low specific impulses and thrust greatly limit the capability of nanosatellites to conduct meaningful plane and attitude changes in space.
Sung-O Kim, Choon-Sang Park, Tae Seung Cho   +2 more
doaj   +1 more source

DESIGN AND FABRICATION OF MICRONOZZLES

International Islamic University Malaysia Engineering Journal, 2011
Micronozzle, a key component in micropropulsion system, has been designed and fabricated. Quasi 1D inviscid theory was used in designing a series of conical micronozzles of different expander half-angles (10°-50°).
Kean How Cheah, Jit Kai Chin
doaj   +1 more source

CFD-Driven Optimization of Dual-Throat Micro-Nozzle for Enhanced Thrust in Cold Gas Propulsion for Microsatellites

, 2023
Micro spacecraft have garnered increasing favor for their adaptability in space missions. Cold gas propellant-based (CGP) micro propulsion systems assume a pivotal role in enabling maneuvering, monitoring, and precise attitude control in micro/nanosatellites, offering attributes of simplicity, non-toxicity, and minimal leakage compared to alternative ...
openaire   +2 more sources

Aerosol Flow Through a Converging-Diverging Micro-Nozzle

Nonlinear Engineering, 2013
Cold spray is a material deposition process used to deposit metallic features for use in applications such as corrosion prevention, dimensional correction and repair, and wear resistant coatings.
Bhattacharya Sourin, Lutfurakhmanov Artur, Hoey Justin M., Swenson Orven F., Mahmud Zakaria, Akhatov Iskander S.   +5 more
doaj   +1 more source

Optical investigations on hydrogen/methane‑oxygen flame diluted by steam in micro-mixing burners

Fuel Processing Technology
Motivated by the goal of zero-emission power generation, the current paper investigates the micro-mixing combustion of hydrogen/methane and oxygen under steam diluted conditions, over a range of oxygen mole fraction (0.05–0.5) and hydrogen blending power
Xiangnan Chen, Kang Ma, Zixu Nian, Kuanyu Wang, Yong Tang, Gongxi Zhou, Baolu Shi   +6 more
doaj   +1 more source