排序方式: 共有28条查询结果,搜索用时 15 毫秒
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M. Kh. Gadzhiev E. Kh. Isakaev A. S. Tyuftyaev D. I. Yusupov M. A. Sargsyan 《Technical Physics Letters》2017,43(4):369-371
We have developed and studied a new effective megawatt double-unit generator of low-temperature argon plasma, which belongs to the class of dc plasmatrons and comprises the cathode and anode units with divergent gas-discharge channels. The generator has an efficiency of about 80–85% and ensures a long working life at operating currents up to 4000 A. 相似文献
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Il’ichev M. V. Mordynskii V. B. Tereshonok D. V. Tyuftyaev A. S. Chikunov S. E. 《High Temperature》2015,53(2):193-198
High Temperature - A technique of determination of the thermal conductivity of structural materials in a wide range of temperatures has been developed and verified. A three-dimensional simulation... 相似文献
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M. Kh. Gadzhiev Y. M. Kulikov V. A. Panov E. E. Son A. S. Tyuftyaev 《High Temperature》2016,54(1):38-45
The effects of real gases (excitation of vibrational degrees of freedom, dissociation and ionization) taken into account for supersonic nozzle profiling. The paper presents the method of the supersonic nozzle profiling for non-monotonic dependence of adiabatic index on temperature. The results of nozzle profile calculation for two sets of input parameters, based on independently determined specific heat for molecular nitrogen N2 and products of its thermal decomposition in the temperature range of 260–105 K and atmospheric pressure are presented. The experimental set-up based on proposed method of supersonic nozzle has been developed and manufactured. The gas velocity at different distances from the nozzle outlet has been measured. Results show the existence of the supersonic and transsonic flow regimes after the nozzle. 相似文献
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Plasma surface strengthening plant and processing of the rail rolling stock wheel pairs are described here. Following on from starting the equipment design up to hardened wheel pairs' acceptance, accurate adherence of the process-dependent parameters at plasma treatment, and automated control ensure hardened surface structure and properties stability, as the final result it guarantees road safety. 相似文献
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Gadzhiev M. Kh. Tyuftyaev A. S. Muslimov A. E. Kanevsky V. M. Ismailov A. M. Babaev V. A. 《Technical Physics Letters》2019,45(11):1118-1121
Technical Physics Letters - We have studied the influence of a flow of high-enthalpy nitrogen plasma generated by a dc plasmatron on the morphology, electrical properties, and UV photoconductivity... 相似文献
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A review is made of experimental and theoretical investigations of processes occurring in low-temperature plasma generators
(LTPG) with divergent channel of the output electrode, and the possibilities of utilizing these generators in new plasma technologies
are analyzed. Comparison is made of the characteristics of discharge (including the current-voltage characteristic) in a divergent
channel and in a cylindrical channel of uniform cross section. The effect of divergent channel of the output electrode and
of its expansion ratio on the pattern of physical processes in LTPGs of different designs is studied. Investigations are performed
of the distribution of electric current and heat flux density along a channel with a segmented output electrode. The voltaic
equivalents of heat fluxes to cathode and anode are determined. The process of “shunting” of discharge is investigated, which
causes fluctuations of electric arc-burning voltage. The investigations involving an LTPG with divergent channel reveal that
the voltage amplitude in the case of shunting decreases with increasing current strength and, at high currents of argon arc,
does not exceed 1–2 V. Results are given of spectral and visual investigations of LTPG. It is demonstrated that, in an LTPG
with divergent channel, the plasma temperature in the region of energy input at currents of 300 A and higher exceeds 30 000
K. The significant part is found which is played by vacuum ultraviolet radiation in the process of closing the arc to anode.
The mechanisms of erosion of the tungsten cathode tip are investigated, which play an important part in increasing the cathode
service life by way of recirculation of tungsten atoms because of their ionization in the discharge gap. Results are given
of using an LTPG with divergent channel of the output electrode in plasma technologies of surface hardening, cutting, and
hard-facing of metals. The technology of plasma hardening of wheel pairs, adopted by the RZhD (Russian Railroads) Joint-Stock
Company, provides for increasing the service life of railroad wheels by a factor of 1.5–2. 相似文献
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Kats Ya. L. Krasnyanskii M. V. Yusupov D. I. Tyuftyaev A. S. Gadzhiev M. Kh. Khromov M. A. 《Metallurgist》2019,63(3-4):228-237
Metallurgist - The paper presents the experimental results on plasma heating of fired periclase-carbonaceous refractory material. A high heating rate of more than 1000°C/h was achieved. The... 相似文献