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101.
102.
Flow and Heat Transfer in Underexpanded Air Jets Issuing from the Sonic Nozzle of a Plasma Generator
N. E. Afonina S. A. Vasil'evskii V. G. Gromov A. F. Kolesnikov I. S. Pershin V. I. Sakharov M. I. Yakushin 《Fluid Dynamics》2002,37(5):803-814
We present the results of an experimental investigation and numerical simulation of the gasdynamic structure of underexpanded dissociated-air jets and the heat transfer in these strongly nonequilibrium flows under the test conditions realized in the 100-kW electrodeless VGU-4 plasma generator of the Institute for Problems in Mechanics of the Russian Academy of Sciences (IPM RAS). The flow and heat transfer analysis is carried out on the basis of measurements of the static pressure in the plenum chamber, at the sonic nozzle exit, and on the low-pressure chamber wall, the stagnation pressure on the jet axis using a Pitot tube, and the heat transfer at the stagnation points of water-cooled models placed along the jet axis. The numerical simulation, based on complete Navier-Stokes equations, includes the calculation of (1) equilibrium air plasma flows in the discharge channel of the VGU-4 plasma generator; (2) underexpanded nonequilibrium dissociated-air jet outflow into the ambient space; and (3) axisymmetric jet flow past cylindrical models. 相似文献
103.
Doklady Physics - We report on developing an ultracompact (~300 g) fluorescence lidar based on a diode laser (405 nm, 150 mW) and a diffraction spectrometer equipped with a linear photodiode... 相似文献
104.
Pershin S. M. Brysev A. P. Grishin M. Ya. Lednev V. N. Bunkin A. F. Klopotov R. V. 《JETP Letters》2020,111(7):392-396
JETP Letters - It has been demonstrated for the first time that pulsed laser Raman spectroscopy can be used for diagnostics of a local acoustic pressure profile with a peak pressure drop of 50 MPa... 相似文献
105.
V. K. Pershin Vi. K. Pershin S. A. Skopinov 《Molecular Crystals and Liquid Crystals》2013,570(1):213-229
It is shown that plastic and liquid crystals differ exclusively in characteristics of topologic order and are peculiar structural forms of more general superpositional state. On the basis of the generalization of the concept of a paracrystal a diagram of structural states is constructed allowing to classify partially ordered phases over the degree of destruction of long-range translational and orientational order. 相似文献
106.
A new type of linear disclinations in a cylindrical capillary with a nematic liquid crystal (NLC) has been studied. It can be considered as a generalized linear disclination of the unit strength. The exact analytical expressions for the elastic field components, lines of force, and the free energy of deformation have been derived. 相似文献
107.
V.?N.?LednevEmail author P.?A.?Sdvizhenskii R.?D.?Asyutin M.?Ya.?Grishin R.?S.?Tretyakov S.?M.?Pershin 《Bulletin of the Lebedev Physics Institute》2018,45(12):399-403
For the first time, the effect of target surface plasma on nanosecond laser ablation is studied. Surface plasma was generated by a high-power cw fiber laser beam incident on an iron target. A comparison of laser ablation by nanosecond Nd:YAG laser pulses (1064 nm, 5 ns) was performed upon exposure to the cw laser and during its short-term (5 ms) turn off. It was found that the emission intensity twofold increases in the presence of surface plasma. The temperature and electron density of the laser plume induced by the nanosecond laser also increased. 相似文献
108.
S. M. Pershin 《Physics of Wave Phenomena》2008,16(1):15-25
A hypothesis of the quantum nature of the specific temperatures T
s of water and ice, whose values is not random, was formulated. It was found that the quantum energy hΩ
mn
of closely located rotational transitions in the ortho and para spin isomers of H2O molecules coincides with the translation energy kT near the well-known specific temperatures T
s in ice and water. On the basis of this fact it was suggested that ortho-para conversion occurs at temperatures close to T
s upon inelastic collisions and resonance energy exchange kT
s ↔ hΩ
mn
in the rotation-translation-rotation (RTR) processes. Such conversion can induce rearrangement of the H-bond set structure
and repacking of H2O molecules. The coincidence kT
s ≈ hΩ
mn
was checked for ice and water at 12 known T
s, as well as for heavy water D2O near T
s = 11.2°C (maximum density) and −140°C (glassy transition). The previously observe strong deformation of the OH Raman band
near T
s = 4, 19, 36, and 76°C (maximum density, maximum surface tension, minimum heat capacity, and maximum speed of sound, respectively)
was interpreted as a manifestation of the water structure rearrangement induced by H2O ortho-para conversion. 相似文献
109.
Doklady Physics - A multiple (from 20 to 3 kV) decrease in the ignition threshold of commercial flash lamps for solid-state lasers under HF pumping at a megahertz frequency has been detected. It... 相似文献
110.
A. F. Bunkin V. K. Klinkov V. A. Luk’yanenko S. M. Pershin 《Physics of Wave Phenomena》2010,18(3):230-235
The evolutions of the signals of the elastic (Mie) and Raman backscattering of the Nd:YAG laser second-harmonic radiation
in the upper layer of the sea under cavitational perturbation induced by the passage of a high-speed boat are compared under
the conditions of the outdoor experiment. It is shown that the signal of the elastic scattering on bubbles returns to the
background level within the time of ∼10 min. The relaxation time of the spontaneous Raman scattering signal can be an order
of magnitude larger than this value (the evaluated value under the particular conditions of this experiment is ∼120 min).
Interpretation is given to this difference in attenuation time of the elastic and inelastic scattering signals at the cavitational
perturbation of the sea. 相似文献