Schmidt pulse combustor

The operation of the Schmidt pulse combustor is based upon the principle of the quarter-wave sound resonator formed of a tube closed at one end. The acoustic pressure oscillations excited within this tube experience their maximum value at the closed end (at the lid) and their minimum value (which is... 

Pulse combustors may be categorized into three distinct classes according to the specific acoustic system on which their operation depends. These are the Quarter-Wave (or Schmidt) combustor, the Helmholtz combustor, and the Rijke-type combustor. 

Pulse combustors may be categorized into three distinct classes according to the specific acoustic system on which their operation depends (i) the Quarter-wave (or Schmidt) combustor (ii) the Helmholtz combustor and (iii) the Rijke-type combustor. In contrast to the Rijke combustor, which operates with solid fuels, both the Schmidt and Helmholtz combustors accept liquid and gaseous fuels. The Helmholtz combustor is preferred for drying applications because the larger volume of the combustion chamber and the smaller (but longer) tailpipe allows for multivalve assembly. Detailed information on these types of combustor is available in articles by Zinn (1985) and Kudra and Mujumdar (2009). Some combustors also exploit the resonance phenomenon these are referred to as frequency-tunable pulse combustors. 

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