Experimental Analysis on Basic Combustion Instability using Rijke Tube

Abstract

Thermoacoustic instability has been a significant design issue in liquid rocket engines and gas turbine engines, unsteady heat discharge sometimes gets in phase with pressure perturbations. It is essential to study and understand these instabilities so that they can be controlled or can be used to develop something that uses instability to its benefit. A Rijke Tube is a simple and inexpensive experimental setup, designed and developed for research and to study the fundamental mechanism of thermoacoustic instability. The Rijke tube represents resonating chamber with free airflow and a heat source just like a typical combustion chamber. At some higher gain value, a loud noise observed, representing thermoacoustic instability. This work focuses on designing and developing an experimental setup to perform experimental analysis by introducing a signal using a microphone and speaker. Different thicknesses of coils will be used to study how stabilization time and temperature vary. Each coil is positioned at two different positions to understand the variation in stabilization time. A comparison study is done to understand the variations stated above.