We propose in this work an original finite volume scheme for the system of gas dynamics in a nozzle. Our numerical method is based on a piecewise constant discretization of the crosssection and on a approximate Riemann solver in the sense of Harten, Lax and van Leer. The solver is obtained by the use of a relaxation approximation that leads to a positive and entropy satisfying numerical scheme ...

Purpose. To calculate the temperature and velocity of nickel aluminum oxide particles in supersonic flow low-pressure cold gas-dynamic spraying nozzle. investigate effect gas parameters at nozzle inlet, particular pressure, on outlet.
 Research methods. The calculation temperature-velocity characteristics powder is performed after determining channel using well known dependencies. initial ...

SHIPTRAP is a new ion trap system for high-precision mass measurements of transuranium recoil-ions from the SHIP facility at GSI. The system consists of a buffer-gas cell to thermalise the incoming ions, an extraction system to separate the ions from the buffer gas, an RFQ buncher to cool and accumulate the ions and a tandem Penning-trap system for isobaric purification and high-precision mass ...

The brilliance of a laser-produced soft X-ray source is enhanced for gaseous target concepts. In contrast to solid or liquid target materials, these sources are clean and versatile but provide a comparably low conversion efficiency of laser energy into EUV and soft X-ray radiation. The basic idea is to induce supersonic effects in the gas jet, leading to a local increase of the particle density...

Numerical modeling of direct hydrogen injection and in-cylinder mixture formation is performed in this paper. Numerical studies on direct-injection hydrogen engines are very limited due mainly to the complexity in modeling the physical phenomena associated with the high-velocity gas jet. The high injection pressure will result in a choked flow and develop an underexpanded jet at the nozzle exit...

Vibrational and electron kinetics, as well as electronic excited states and ionization kinetics, have been coupled self consistently solving master and Boltzmann equation at the same time. These kinetics have been inserted in a quasi one-dimensional code for the high enthalpy nozzle expansion. INTRODUCTION The supersonic expansion through a nozzle flow is characterised by strong non-equilibrium...

Flux-vector and tlux-difference splittings for the inviscid terms of :hs compressible flc:\ equations are derived under the assumption of a general equation of state for a reai gas in squilibrium. No unnecessary assumptions. approximations, or auxiliary quantities are introduced. The formulas derived include several particular cases known for ideal gases and ;cadilq appi) to curvilinear coordin...

A new gas puff imaging (GPI) diagnostic has been developed on HL-2A tokamak to study two-dimensional plasma edge turbulence in poloidal vs radial plane. During a discharge, neutral helium or deuterium gas is puffed at the edge of the plasma through a rectangular multicapillary nozzle to generate a gas cloud on the observing plane. Then a specially designed telescope and a high-speed camera are ...

SCORES (SpaceCraft Object-oriented Rocket Engine Simulation) is an analysis tool being developed for conceptual-level spacecraft and launch vehicle design. Written in C++, SCORES provides rocket thrust and Isp for propulsion system trade studies. Common gateway interface scripts, written in Perl, provide an interface with the World Wide Web. The design parameters used in SCORES are mixture rati...