نتایج جستجو برای: liquid propellant
تعداد نتایج: 219239 فیلتر نتایج به سال:
Experiments have been performed at ASDEX Upgrade, aiming to investigate the impact of lithium in an all-metal-wall tokamak and attempting to enhance the pedestal operational space. For this purpose, a lithium pellet injector has been developed, capable of injecting pellets carrying a particle content ranging from 1.82 × 10(19) atoms (0.21 mg) to 1.64 × 10(20) atoms (1.89 mg). The maximum repeti...
Numerical results that demonstrate how ion emissive surfaces should be shaped to induce the formation of well-focused, high-current beamlets are presented. Results obtained when the sheath shape and position are established and then held constant as operating conditions are changed are compared to corresponding results obtained with a conventional plasma sheath that moves. These comparisons sho...
With the aim to reduce cost and increase reliability, MEMS technology penetrates space market and new MEMS components are developed for Space application. Among them, micropropulsion devices is an active field of technological research. Several micropropulsion option are under development : the thrust is produced either from a electrical source (electrical thruster) or a chemical source (chemic...
The potential environmental effects of the exhaust products of conventional rocket propellants have been assessed by various groups. Areas of concern have included stratospheric ozone, acid rain, toxicity, air quality and global warming. Some of the studies which have been performed on this subject have concluded that while the impacts of rocket use are extremely small, there are propellant dev...
The theoretical chemical and electrospray performance of [Bmim][dca], [Bmim][NO3], or [Emim][EtSO4] mixed with HAN in aqueous solution for dual mode chemical monopropellant/bipropellant and electrical electrospray rocket propulsion have been investigated. A ternary mixture comprised of 80 percent HAN, 20 percent of each ionic liquid fuel, and no water yielded the maximum specific impulse and ch...
We present a fully compressible single-fluid volume of fluid (VOF) solver with phase change for high-speed flows, where the atomization liquid can occur either by aerodynamics or effect local pressure. The VOF approximation among non-miscible (non-condensable gas) and mixture two fluids (liquid vapor) represents core jet its atomization. A barotropic model is used in combination equation state ...
In-situ observation of an operating ionic liquid electrospray emitter was achieved using a LaB6 transmission electron microscope. The emitter was an electrochemically etched tungsten needle that was externally wetted with the ionic liquid OMIM-BF4. During both positive and negative emission solid dendritic structures were created and left behind at the emission sites. These structures were seen...
Burning rate accelerating catalysts are reckoned to be of important additives in the synthesis process of composite solid propellants on which much effort is made these days to suggest a novel procedure for their synthesis. Among many tasted chemicals, liquid ferrocene derivatives have been used much more vastly due to their better performance and suitable processability. But, these compounds s...
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