An electrically shunted loudspeaker driver device is connected as a side-branch to the main tube via a small aperture. This study demonstrates an electroacoustic control approach of suppressing the thermoacoustic instability in a Rijke tube by altering the wall boundary condition. Unsteady heat release coupled with pressure fluctuation triggers the thermoacoustic instability which may damage a combustion chamber severely. The Rijke tube is essentially a pipe open at both ends with a mean flow and a concentrated…Įlectroacoustic control of Rijke tube instability The main objective of this article is to present the theory of thermoacoustic oscillations for this purpose, a simple Rijke-type thermal device was built. In this article we present a project that includes physical measuring, examination and modelling task. Thermoacoustic School Project Work with an Electrically Heated Rijke TubeĮRIC Educational Resources Information Center The aim of our project is to help our students enhance their knowledge about thermoacoustics and develop their applied information technology skills. We have employed electrically heated Rijke tubes in our thermoacoustic school project work, and present a numerical algorithm to predict the transition to instability in this model the effects of the main system parameters are demonstrated. In this paper we present a project that includes physical measuring, examination and modelling. It serves as a convenient prototypical example to understand thermoacoustic effects since it is a simplified thermoacoustic resonator once excited, under certain conditions, it is capable of creating a sustained sound when thermal energy is added. The Rijke tube is a simple device open at both ends with a mean airflow and a concentrated heat source (a heated wire grid). The main objective of this paper is to present the theory of thermoacoustic oscillations, and for this purpose a Rijke-type thermal device was built. Thermoacoustic instability plays an important role in various technical applications, for instance in jet or rocket motors, thermoacoustic engines, pulse combustors and industrial burners.
Modelling of thermoacoustic phenomena in an electrically heated Rijke tube