DAMPING VIBRATION OF AUTO COMBUSTION FLOW DYNAMIC DAMPER

V.V. Gotsulenko, V.N. Gotsulenko

The mathematical model of unsteady movements of products of combustion in a vertical model of the combustion chamber when connecting to it once-through passive dampers in the form antiimpulsnyh partitions and acoustic LC - circuit. The features of the vibration damping oscillations of combustion at the joint and separate action of its mechanisms: delay of combustion and negative viscous resistance along the length of the combustion chamber and heat, as well as a vortex of negative resistance vane blower. Established that antiimpulsnye partitioning increases the wave resistance of the combustion chamber and lead to the elimination of the longitudinal relaxation as well as harmonic oscillations in different types of pressure characteristics of the combustion chamber. Acoustic LC - circuit placed in a flow path between the combustion chamber and vane supercharger with a monotonically decreasing pressure characteristic of the combustion chamber damps as relaxation and harmonic self-oscillations. In the case of saddle pressure characteristics of the combustion chamber under review, acoustic LC - circuit longitudinal relaxation self-oscillations are not damped. Such a damper can eliminate only the harmonic and close to them in the form of self-oscillation.

Key words: self-oscillations of vibration combustion ramjet damper, damping oscillations, impedance, antiimpulsnye septum.