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Holographic Distrometry

#0474


Holographic Distrometry. Holographic Methods and Means for Measurement of Small Particles Parameters in High-speed Two-phase Flows

Tech Area / Field

  • INS-MEA/Measuring Instruments/Instrumentation

Status
8 Project completed

Registration date
09.11.1995

Completion date
30.08.2002

Senior Project Manager
Kulikov G G

Leading Institute
Central Research Institute of Machine Building (TsNIIMash), Russia, Moscow reg., Korolev

Supporting institutes

  • Scientific Research Institute for Optophysical Measurements, Russia, Moscow\nMSS Company, Russia, Moscow reg., Korolev\nVavilov State Optical Institute (GOI), Russia, St Petersburg

Collaborators

  • Steinbichler Optotechnik GmbH, Germany, Neuherberg\nISL / Institut Franco-Allemand de Recherches de Saint-Louis, France, St Louis

Project summary

At present the actual scientific and engineering problem is disdrometry of two-phase streams (measurement of parameters of three-dimensional particle ensembles). The solution of this problem will permit to make many processes in industry, in transport, in technology, in science more optimum.

These processes are concerned with: heat-and-power engineering(the optimization of combustion processes in electric power stations making use of the coal fuel); auto engine production field (the optimization of the fuel-spraying processes in the internal-combustion engines); jet engine production field (the optimization of the working conditions of the jet engines with the double-phase working mixture); shipbuilding (the suppression of the cavitation processes on the rowing blades; new technologies (the optimization of the material treatment processes and processes of the creation of new materials by the use of high speed two-phase flows and also the spheroidizing of wrong form particles; chemical industry, building construction (the optimization of the working conditions of the aerosol atomizers and the paint pulverizers, etc.) ; ecology (the checking and the optimization of the function of industrial filtering arrangements for the reduction of industry refuses in atmosphere); communication, meteorology (the research of the processes aggravating transparency of atmosphere and preventing from the spread of laser radiation, for example, dusty flows in atmosphere, etc.).

The project purpose is development of physical and technical bases of holographic disdrometry of high-speed two-phase flows. At present in world practice there are no effective methods for research such phenomena of particular practical interest as under high concentration and high speed of particles. Approaches being developed are based on well-known schemes and techniques using commercial lasers. Possibilities of these methods are mainly limited in velocity, concentration and sizes of particles. Up to last time the attained possible range of holography methods was limited by values of the condensable phase speed and research ensemble optical density (about 500-1000 m/s and 0.1 accordingly). Methods and means for multiple-pulse disdrometry and metrology certification of holographic disdrometers are not development enough.

The project provides solving the problem of complete quantitative analysis of high-speed two-phase flow parameters with metrology certification, including determination of velocity, direction of moving, sizes and spatial distribution of particles simultaneously in all researched volume as far as spatial distribution of continuous phase (gas or liquid) surrounding the ensembles. Whereas the existent alternative methods based on taking samples from flows, photography, laser anemometry, etc. permit to register information using only one of the parameters integrally or in small part the research volume.

The technical approach contains a number of unconventional methods. Among these are suppression methods of volume noises. program ensuring of image correction, as well as particle counting and interferogram analysis.

A radical new step in a holographic disdrometry is the design and the research of the methods for determining of particle velocity vectors in turbulent and vortex flows with the use of multiple-pulse lasers and computer means of the calculation of multi-point image coordinates.

The elaboration of the opt-electronic system for an entry of an information in computer will be a new step in a technique of a data processing.This system will permit to enter the summary wave field of the Fourier conversion in computer without the phase loss.

New step in metrology of particle ensembles will be elaboration of the model means of the metrological ensuring of disdrometers.

On the base of project experimental models of holographic and laser-correlation disdrometers are supposed to be constructed and tested with metrology certification. This equipment would be able to solve a wide class of problems of modern industry, transport, technics and science at velocities up to 5000 m/s under particle ensemble optical density to 0.5-1 and particle sizes 1-1000 mm.

In companies-members of the project - TSNIMASH, VNIIOFI, GOI - there is significant experience in development and application of holographic disdrometry to solve the defence and general-pur-pose problem. In particular, beginning in 1970 in GOI in collaboration with other members there were developed the methods of studying the particles stream in nozzle outlet of solid fuel engines, this particles having velocities from 700 up to 1500 m/s. The methods were developed for particles stream registration of high (down to mm) resolution . The investigations of laser with controlled pulse duration in sub nanosecond range were accomplished, that allowed to enlarge the ranges of velocities and particles concentrations.

At present the members of the proposed project continue to work in basic directions of investigations centered around this project, including creating of new pulsed sources with spectral and space-time control of emission. The media for expeditious recording of holograms, controlled amplification of weak light flux, modifying of software to process the particles images are being devised.

The work in the frame of this project allows the forces of investigators to be concentrated on solving general task formulated above and the samples of apparatus of high competition ability in the world level to be created.

The role of foreign collaborators consists in giving more precise definition to technical requirements for holographic disdrometers conformably to local conditions and contacting between the project participants and abroad firms interesting with project investigations. It is supposed to organize coinvestigations of the disdrometry problems in the future.


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