In the propulsion system of cryogenic liquid rockets, low-frequency pressure oscillation is a long-standing issue occurring in its feeding pipe, and not conducive to normal operation rocket. Its mechanism excitation process are very clear due limitation existing numerical method difficulty real dynamic experiment. Inspired by periodic suck-back flow phenomenon steam condensation, fluctuation tw...

Pulsed plasma thrusters (PPTs) are the simplest electric acceleration devices with solid propellant on satellites. In order to make their thrust performance higher and to feed propellant more effectively, we have been developing a new type PPT using powdered propellant. To estimate its thrust performance, we have made a test model thruster for comparing the thrust performances of PPTs with soli...

Abstract In this paper, using methane/oxygen as the engine propellant, single nozzle structure and coaxial shear injection unit were used to analyse influence of propellant flow change on combustion chamber field different factors efficiency. The results show that pressure increases, concentration components reaction speed is accelerated, maximum temperature but radial length high area decrease...

an internal ballistics model has been developed for performance prediction of a solid propellant rocket motor. inthis model a 1-d unsteady euler equation with source terms is considered. the flow is assumed as a non-reacting mixture of perfect gases with space and time varying thermo physical properties. the governing equations in the combustion chamber are solved numerically by using the stege...

Nitrocellulose is cellulose that titrated into an ester polymer which can be used as a major component in several types of ammunition and explosives other materials. Hemp (Boehmeria nivea) type fiber plant rich thrives Indonesia. Until now, the need for nitrocellulose Indonesia still imported, even though there lot potential exploited, one by synthesizing from hemp plant. One many uses derivati...

Februar y 20 09 PA T RA W LI N G S SA IC A lone amid the cosmic blackness, NASA’s Dawn space probe speeds beyond the orbit of Mars toward the asteroid belt. Launched to search for insights into the birth of the solar system, the robotic spacecraft is on its way to study the asteroids Vesta and Ceres, two of the largest remnants of the planetary embryos that collided and combined some 4.57 billi...

Ionic liquid ferrofluids based on mixtures of [Emim][EtSO4] and [Bmim][NO3] fuels and hydroxylamonium nitrate oxidizer were synthesized by adding iron oxide nanoparticles. The resulting propellants were then tested for decomposition capability. Spot plate testing indicated that the temperature required to initiate rapid decomposition dropped from 115 o C to 75 o C with a 30% by weight addition ...