On the efficiency of active control of thermal convection in a thermosyphon with time-delayed controller

Authors

  • Иван Васильевич Красняков (Ivan Krasnyakov) Perm National Research Polytechnic University
  • Дмитрий Анатольевич Брацун (Dmitry Bratsun) Perm National Research Polytechnic University

DOI:

https://doi.org/10.17072/1994-3598-2017-2-59-68

Abstract

The paper deals with the problem of automatic control of the motion of an inhomogeneously heated liquid in long vertical channels connected at the ends. Such a rectangular loop (a non-simply connected thermosyphon) makes it easy to maintain the mechanical equilibrium of a liquid with a vertical temperature gradient. The fluid flow is controlled by small discrete channel orientation changes with respect to the static component of the inertial field, for example, gravity. Such changes are made by the computer according to the law of proportional negative feedback. The effect of a time delay, which naturally arises in the controller's commands, is considered. To study the effect in detail, an artificial time delay has been also added. A mathematical model of the phenomenon is developed. Dynamic modes of the work of a controlled convective loop are numerically studied. It was found that the excessive feedback gain can cause non-stationary convection modes in the system. Methods for weakening the delay effect are discussed.

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Published

2017-10-23

How to Cite

Красняков (Ivan Krasnyakov) И. В., & Брацун (Dmitry Bratsun) Д. А. (2017). On the efficiency of active control of thermal convection in a thermosyphon with time-delayed controller. Bulletin of Perm University. Physics, (2(36). https://doi.org/10.17072/1994-3598-2017-2-59-68

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