Investigation of the instability of an arc descharge in an air flow

Using an automated complex of spectral apparatuses that allow one to determine local profiles of averaged temperature and its oscillations in a dc arc-discharge column, we investigated the temperature instability of the arc plasma in a laminar air flow. We show that the character of oscillations corresponds to the model of thermal destabilization of discharge. Academic Scientific Complex “A. V. Luikov Heat and Mass Transfer Institute of the Academy of Sciences of Belarus,” Minsk, Institute of Molecular and Atomic Physics of the Academy of Sciences of Belarus, Minsk. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 69, No. 5, pp. 800–804, September–October, 1996.     

Hydrodynamic instability of the axisymmetric flow of an ideal fluid with an interphase

We study the instability under simultaneous rotational and translational flow of a fluid and ambient medium in the cases of a cylindrical annular jet, capillary jet, and cylindrical fluid layers on the inner and outer surfaces of a cylinder.     

Neuronet Data Processing on the State of an Object After an Emergency

Neuronets are considered for processing data on the state of a potentially hazardous object after an emergency. An example is given of processing the data on the state of a potentially hazardous object in increments.Translated from Izmeritel’naya Tekhnika, No. 3, pp. 6–8, March, 2005.     

Analysis of an algorithm for estimating the instantaneous frequency of an analytical signal

The results of an analysis of the errors of an algorithm for estimating the instantaneous frequency of an analytical signal when the parameters of its quadrature components, the number of quantization levels, the number of readouts per period, and the signal/noise ratio change, are presented. Translated from Izmeritel'naya Tekhnika, No. 8, pp. 57–62, August, 2000.     

Influence of an external acoustic field on the temperature of an arc-discharge plasma

The influence of an external acoustic field on the temperature of an air-discharge plasma in the channel of a sectional plasmatron is investigated.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 51, No. 3, pp. 481–486, September, 1986.     

Determination of the volume content of the components of an oil-water type emulsion from the parameters of an electromagnetic resonator

The variations of the main parameters of electromagnetic oscillations in the sensitive element (a resonator embedded in a pipeline) of a radio-frequency sensor under resonance conditions for flows of emulsion mixtures are determined and investigated. Algorithms for determining the volume content of the components of oil-water mixtures with an arbitrary degree of water mineralization are developed. __________ Translated from Izmeritel’naya Tekhnika, No. 9, pp. 60–65, September, 2007.     

Design of an infrared monochromatic system with an AOTF as the dispersion element

In this paper, a method on how to design an infrared monochromatic system based on an acousto-optic tunable filter (AOTF) is introduced. Some key problems about optical system (including collimation of incident light beam and working distance-the shortest distance to separate the zero order light and the diffracted light) are researched and solved. The driving circuit for an AOTF based on Direct Digital Synthesis and a Digital Signal Processor is also introduced. The experimental results show a direct proportional relationship between the wave number of diffracted light and the driving frequency. The monochromatic system has a wave number range of 2000-4000 cm(-1) and the spectral half-width is 20 cm(-1).     

Investigation of the trajectory of motion of an aerosol in an isothermal gaseous curvilinear flow

On the basis of experimental and computational investigations, the feasibility is analyzed for the mathematical and physical simulation of slightly dust-laden curvilinear flows.Translated from Inzhenerno-Fizicheskii Zhurnal, February, 1971, Vol. 20, No. 2, pp. 255–260.     

既有桥梁对相邻车-桥系统气动力的影响分析

为了研究既有桥梁对相邻车-桥系统气动力的影响,通过节段模型风洞试验,测试了考虑、不考虑既有桥梁干扰工况下相邻车-桥系统的气动力系数,数值模拟了作用在车-桥系统上的抖振力时程,并计算了抖振力极值。结果表明:既有桥梁对相邻车-桥系统气动力的影响显著,导致部分工况下列车、桥梁的气动力显著增大,结构设计中应充分考虑邻近桥梁的气动影响;车-桥系统中列车的气动力受既有桥梁的影响更大;受既有桥梁影响,不同工况下,列车横向力系数最大增幅、减幅分别为39.3%和-143.1%,列车升力系数最大增幅、减幅分别为52%和-68.2%;不同工况下桥梁阻力系数均减小,且最大减幅为-22.4%;迎风侧列车抖振横向力、抖振升力幅值均显著增大,背风侧列车抖振力幅值变化相对较小;桥梁抖振力阻力幅值减小,抖振升力和抖振升力矩幅值略有增大;列车抖振横向力、抖振升力的极值增幅分别为35%和67%;桥梁抖振阻力的极值减幅为-22.9%,抖振升力、抖振升力矩的极值增幅分别为48.5%和37.5%。     

赢创-创新思维、智绘未来

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