Parametric investigation of hydrodynamic stability of a boundary layer on a flat plate over two-layer compliant coatings

A. E. Darzhain, A. V. Boiko, V. M. Kulik, A. P. Chupakhin

Research output: Contribution to journalArticlepeer-review

Abstract

The results of a parametric study of hydrodynamic stability in linear formulation of the Blasius boundary layer stability over two-layer compliant coatings are presented. In the calculations, experimental data for real silicon rubbers of several types on the elasticity modulus and the loss factor as functions of deformation frequency are used. Eight pairs of the coatings have been considered. The effect of coating layer thickness and external flow velocity on flow stability, in particular, on the behavior of the critical Reynolds number, has been studied parametrically. The regions of the critical Reynolds number of nonmonotonic nature, characteristic of most of coatings under consideration, have been found. A qualitative explanation of this effect is given. An analysis of the behavior of the critical Reynolds number allows determination of the optimal ratio of coating thicknesses for interaction with the flow.

Original languageEnglish
Pages (from-to)181-192
Number of pages12
JournalThermophysics and Aeromechanics
Volume27
Issue number2
DOIs
Publication statusPublished - 1 Mar 2020

Keywords

  • boundary layer
  • compliant coatings
  • critical Reynolds number
  • hydrodynamic instability

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