Journal ArticleDOI
Some Characteristics of Exhaust Plume Rarefaction
TLDR
In this paper, the rarefaction of a free jet expanding into a region of finite background pressure is considered and a simple scattering formulation of the complex physical problem is proposed Comparison of the scattering prediction and previous molecular beam flux measurements by Fenn and Anderson are presented.Abstract:
In this paper the rarefaction of a free jet expanding into a region of finite background pressure is considered It is found that the rarefaction process can be described by a simple rarefaction parameter D(P SP B^1^ / T Here D is the sonic orifice diameter, P8 is the reservoir pressure, PBW is the background pressure and T is the background and reservoir temperatures which are considered to be the same A simple scattering formulation of the complex physical problem is proposed Comparison of the scattering prediction and previous molecular beam flux measurements by Fenn and Anderson are presented A consistent physical description of a plume's approach to the limit of expansion into a perfect vacuum is discussedread more
Citations
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Journal ArticleDOI
Plume flow and plume impingement in space technology
TL;DR: In this paper, a non-uniform plume flow field (hypersonic continuum and free molecule flow together with the non-equilibrium transition) is determined and the treatment of the nozzle flow with the characteristic viscosity influence.
Journal ArticleDOI
Experimental and numerical investigation of an axisymmetric supersonic jet
Belén Maté,Irina Graur,Tatiana G. Elizarova,I. Chirokov,Guzmán Tejeda,José M. García Fernández,Salvador Montero +6 more
TL;DR: In this paper, a detailed study of a steady axisymmetric supersonic jet of CO2, including experiment, theory, and numerical calculation, is presented, based on high-sensitivity Raman spectroscopy mapping.
Journal ArticleDOI
Experimental detection of rotational non-Boltzmann distribution in supersonic free molecular nitrogen flows
TL;DR: In this paper, the rotational population in supersonic nitrogen-free jets using a resonantly enhanced multiphoton ionization (REMPI) method was measured using the Boltzmann plot.
Journal ArticleDOI
Molecular Simulation of Rarefied Supersonic Free Jets by DSMC Method.
Masaru Usami,Koji Teshima +1 more
TL;DR: In this paper, the authors applied the direct simulation Monte Carlo method to the study of supersonic jets through a thin orifice and examined the influence of roughness of the cell network and the number of molecules in a cell on the simulation results.
Journal ArticleDOI
Facility Effects on Performance Measurements of Micropropulsion Systems that Utilize Gas Expansion
TL;DR: In this article, an underexpanded freejet is used to simulate experimentally a micropropulsion system such as those that operate on the expansion of propellant gases through nozzle geometries.
References
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Structure and utilization of supersonic free jets in low density wind tunnels
TL;DR: Inviscid and slightly viscous flow in supersonic free jet core, and low density wind tunnel applications as discussed by the authors, was used for low-density wind tunnel experiments. But the results were limited.
Electron beam studies of the diffusive separation of helium-argon mixtures in free jets and shock waves
TL;DR: In this article, a narrow electron beam was used to selectively determine the component densities in rarefied helium-argon flows by spectrally analyzing the beam's luminescence, and point-by-point measurements were made along and off the axes of underexpanded free jets and through normal shock waves produced by shock holders placed in the jets.
Journal ArticleDOI
Electron Beam Studies of the Diffusive Separation of Helium‐Argon Mixtures
TL;DR: In this paper, a narrow electron beam was used to selectively determine the component densities in rarefied helium-argon flows by spectrally analyzing the beam's luminescence, and point-by-point measurements were made along and off the axes of underexpanded free jets and through normal shock waves produced by shock holders placed in the jets.