Acoustic Instabilities in Aerospace Propulsion

IIT Madras Course , Prof. R.I. Sujith

Lecture 1: Introduction to Thermoacoustic Instabilities

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Lecture Details :

Acoustic Instabilities in Aerospace Propulsion by Prof. R.I. Sujith, Department of Aerospace Engineering, IIT Madras. For more details on NPTEL visit

Course Description :

Introduction to acoustics and combustion driven oscillations - Derivation of the wave equation - Traveling wave solutions - Acoustic energy corollary - Impedance & admittance - Standing wave solutions - Reflection and transmission - Impedance tube technique.

Effect of area and temperature variation on wave propagation - Wave equation in cylindrical co-ordinates and its applications - Basic principles of combustion driven oscillations - Rayleigh criteria - Mechanisms for instability in solid and liquid rockets, ramjets, gas turbines - Pulse combustors and their analysis using Galerkin technique - Modal analysis - Nonmodal stability analysis - Passive and active control of combustion instability.

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