V.Yu. Aleksandrov , M.A. Ilchenko

DoI Number XXX-YYY-ZZZ

Conference Number HiSST 2018_40101127

One of the main problems in carrying out altitude tests of high-speed ramjet engines integrated with hypersonic flying vehicle, prototypes of advanced heat-stressed combustion chambers of ramjet on ground test rig is the reproduction of air flow parameters at the entrance of engine as close as possible to flight conditions. To generate such flow special vitiated heaters (VH) are used, in which a combustible substance (methane, hydrogen) is burned in oxygen-enriched air. The paper presents the results of pressure pulsation signals registered in high-temperature flows in number of VH differing in design and geometric dimensions. Spectral analysis of the measured signals is performed including the representation of the amplitudes of the spectral components in the form of a function of two parameters: frequency and time (3D spectrum) using the algorithms of Fast Fourier Transform and wavelet analysis for combustion modes with fixed parameters and with their time variation.

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In Categories: HiSST 2018, Hypersonic Flight Dynamics, Hypersonic Propulsion, Supersonic and Hypersonic Aircraft Design, Testing and Evaluation
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