Lately metal welding by high-frequency heating has gained wide recognition. This type of welding possesses a number of advantages over other electric welding technique. The advantages consist in a possibility of creation of high energy concentration in a thin layer of surface to be welded in a short time interval. Welded joints hereat are performed with slight flash and without gas liberation [ 1 1 . Welding by high-frequency heating has found a wide application for production of welded pipes because of its economical efficiency [2].The area of edge heating and flashing is schematically presented in Fig.1. In the section 1, the edges, converging at an angle z , are heated by the current flowing along them. The section II is specified by emergence of some electric contacts between the edges behind the convergent point. Here current is flowing between the edges, heating and blasting the coffer-dams of molten metal. This section is the light source of high brightness, whose spectrum is a linear one, but carries also a powerful background of plasma continuous radiation [3].
The methods and software of' the f'ast-running processes' investigation in van-Otis media (solids, liquids, gas. plasma) and technical objects were developed.The mathematical models of the objects under research were created in the conditions of exposure to the fields possessing different physical nature.The hardware and programming complex of' the i1m-phototelerecording and data processing combining the computer equipment, television-and film technique, was created. permitting to use the advantages of' every type of the technical systems ton the investigation of certain processes, objects and their characteristics. O-8194-2132-4/961$6.OO SPIE Vol. 2751 1159 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/23/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspxthe speed of' the image rendering by the tele-camera; it permits to observe the moving object in any moment of time, with any transfer characteristic in the pseudocolours.
The methods and software of the fast-running processes investigation in various media (solids, liquids, gas, plasma) and rocket-space engineering (RSE) technical objects were developed. The mathematical models of the objects under research were created in the conditions of exposure to the fields possessing different physical nature.The hardware and programming complex of the flim-phototelerecording and data processing combining the computer equipment, television-and film technique, was created, permitting to use the advantages of every type of the technical systems for the investigation of certain processes, objects and their chara' eristics.The hardware and programming complex of the flim-phototelerecording and data processing is used both in the development and designing periods, and during tests, as well as under the long-term operation of technical objects in the ordinary and extremal situations.The fast-running processes' investigations in various media and RSE objects were performed, and by their results the data bank was made.Rocket-space engineering, film-videorecording, film measurements, estimation of errors, image transformation. FILM-VDEORECORDING AND IMAGE PROCESSING SYSTEMS UNDER INVESTIGATION OF THE PROCESSES IN ROCKET-SPACE ENGINEERING OBJECTSThe improvcrnent of the methods of parameters' and values' determination of the processes and phenomena under research in the objects ofRSE is one ofthe important tasks for up-to-date science.For the studying of different objects and measurement of their characteristics, the methods of the flim-photo-telerecording and video filming are widely used. Their possibilities are exceptionally high; and it makes them indispensable in the investigation ofRSE objects.In the Institute of Technical Mechanics of the NAS of Ukraine (Ukraine, city of Dnepropetrovsk) the complex equipment of the flim-photo-telerecording is used during more than 25 years, under the guidance of the Candidate of Technical Science N. [6][7][8][9][10][11][12][13][14][15][16][17][18][19] for the support of scientific investigations ofthe complex processes' structure in the technical systems and devices. The considerable experience was accumulated in the field of film-and videorecording of the fast-running processes in various media (solid, liquid, gas, plasma) and technical objects. The theoretical developments were brought up to the engineering methods and realization in the created devices and control systems for the flim-photo-telerecording process. The unique equipment is available, as well as the methods of organization, technical preparation and flulfilment ofthe high-speed filmtelerecording ofthe fast-running processes and phenomena. For the different objects under research, the optimum structure and characteristics of the main and auxiliary means and requirements to the experimental units were developed. 808 SPIE Vol. 3516 • 0277-786X/99/$1O.O0 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/27/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx
Stack gas cleaning from dust highly dispersed particles in cracking of oil distillates or in production of synthetic rubber, as wefl as in some other petrochemical or petroleum refining processes takes place in an electrostatic precipitator -apparatus of electronic and ionic technology. Intensification of the process results in increasing of waste gas volumes as well as in increasing of gas velocities in active section of the electrostatic precipitator, degradation of separation efficiency, and ecological problems.In electrostatic precipitators the dust particles are charging in the field of negative unipolar corona discharge. Contaminated particles are removed from the gaseous phase out of the boundary laminar layer by means of precipitation on the precipitation electrodes. Gas velocity rises 3. . .4 times as compared with a regular value and this causes the secondary carrying the particles away at the expense of high stream turbulence and reduction of particles staying period in the electrostatic precipitator.Under such conditions, to raise efficiency it is advisable to use the newly developed process of electric gas cleaning with combined gas motion, at which charging of dust particles takes place in highly turbulized zone, with further forcing the particles to be transported to the precipitation zone [1] . Investigation of dust suppression phenomenon comes to solving of electrogasdynamics problem of disperse systems. Electric and wind-tunnel investigations have been carried out at an electrostatic precipitator model (Fig. 1 ) in Ukraine Research Institute NIIOGAZ. Gas velocity measurements were taken by hot-wire method with the help of TAMK-3M complex and inclined filament transducers, that allowed to determined the velocity of the gas stream between the precipitation elements, as well as to confirm implementation of combined gas motion [2] . Limited application of the method while investigating two-phase streams at high voltage in strong fields, necessity of recording the dust particle motion, as well as measurement of displacement, velocity and other parameters, specified employment of kinematic method with use of optical facilities for particles tracking. The latter method is characterized by absence of measuring probes in the stream that produce disturbances, as well as by high accuracy and universality [3].To measure the velocity and direction of the particle displacement use was made of film recording in scattered light, as well as high-speed recording and spark photographing on still film with pulsed illumination by "light knife" method ( Fig.2). Using of "light knife" has two aspects: small size of real dust particles and necessity to have a light source of high intensity. For particle size from I to 3 m, the light energy reflected in direction perpendicular to the plane of "light knife" is very small and directly proportional to the square of the particle diameter. It requires the application of powerful light sources. Shaping a narrow light beam with the help of a slit O-8194-0999-5/931$4.OO
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.