Hydraulic Flow Instability in a Ranque Tube

Pravdina, M. Kh.; Kabardin, I. K.; Polyakova, V. I.; Kulikov, D. V.; Meledin, V. G.; Pavlov, Vladimir; Gordienko, M. R.; Yavorskii, N. I.

doi:10.1134/s0021894420030098

Cited by 9 publications

(2 citation statements)

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“…Temperature, pressure and air mass flow have been considered as the target flow parameters. Temperature is the main parameter that has been chosen for quantitative assessment of the effective and adequate operation of the model [5].…”

Section: The Arrangement and Operation Principle Of The Vortex Energymentioning

confidence: 99%

“…These minima indicate the presence of three poles but maxima do not indicate the presence of zeros. The 4 th order polynomial (5) indicates two local minima with negative values and one local maximum with a positive value. These minima indicate the presence of two poles, the positive maximum indicates the presence of zero.…”

Section: Model Identification Based On Bode Magnitude Plotmentioning

confidence: 99%

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Modeling of Physical Processes of Energy Conversion in Small-Sized Vortex Energy Separators

Kulik

Pasichnik

Sokol

2021

aktt

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The object of study in the article is the vortex effect of temperature separation in a rotating gas flow, which is realized in small-sized vortex energy separators. The subject matter is the models that describe the physical processes of energy conversion in small-sized vortex energy separators as objects of automatic control. The goal is to obtain models of a vortex energy separator reflecting its static and dynamic properties as an automatic control object. The tasks to be solved are: to develop a three-dimensional computer model of a small-sized vortex energy separator which will allow analyzing the parameters of the gas flow and physical processes of energy conversion directly inside the object and obtaining its static characteristics. A linearization method of static characteristics on the interval of input and output values is proposed which will expand the operating range without loss of linearization accuracy. A method of structural-parametric identification based on experimental logarithmic magnitude-frequency characteristics is proposed which will allow for the same set of experimental points to select the structure of the mathematical model of varying complexity depending on the specified accuracy. As a result of the work, the scheme for modeling the automatic control object was formed, consisting of the drive unit, sensor unit, and vortex energy separator, with the reflection of all the obtained operating modes. The methods used are the method of graphic linearization, Laplace transform, structural-parametric identification. The following results were obtained: a computer and linearized mathematical model of the small-sized vortex energy separator as an automatic control object reflecting its properties in the time and frequency domains was obtained. A comparative analysis of the reactions of the model and the real object to the same input action was carried out. Conclusions. The scientific novelty of the results obtained is as follows: 1) multiple graphic linearizations of one static characteristic to use the full range of the operation mode of vortex energy separator, which distinguishes it from the known;2) mathematical model structural-parametric identification for vortex energy separator with the help of known points of the Bode magnitude plots by using the interpolation polynomial and its derivatives graphs.

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Section: The Arrangement and Operation Principle Of The Vortex Energymentioning

confidence: 99%

Section: Model Identification Based On Bode Magnitude Plotmentioning

confidence: 99%