The combustion instability in a propulsion system is a ubiquitous problem. The radial baffles usually installed on the injector faceplate eliminate the combustion instability (acoustic pressure oscillation) in the propulsion system. In this article, the longitudinal baffles are installed on the inner surface of the combustor wall to control the combustion instabilities. The first-order and second-order tangential modes are induced in the experiments. The effects of the parameters of the baffle on the acoustic pressure oscillation in the cylindrical combustor are investigated. The effect of the combustor nozzle on the tangential modes has been systematically investigated. It is concluded that the eigen-frequency and amplitude of the first-order tangential mode decline with the increase in the longitudinal baffle number and height. For the second-order tangential mode, the eigen-frequency and amplitude monotonically increase until a maximum value (four baffles), subsequently decrease with the increase in the baffle number and height. The combustor without the nozzle obtains a lower frequency than that with the nozzle, especially for the low baffle height in the combustor.
In this paper, a 6 wt% carbon nano-suspension was prepared and atomized using electrohydrodynamic atomization technique. The different atomization modes at certain regions of working parameters (applied voltage and flow rate) were studied. In the stable cone-jet mode, the effect of the working distance (distance between needle exit and substrate) on the size and distribution of the deposited relics was examined. It was observed that higher working distance resulted in larger size and higher number density of relics, mainly at the range of 0.2–0.4 µm. A continuous carbon line with the width of ~50 µm was also print-patterned using the electrohydrodynamic atomization deposition technique from the carbon nano-suspension.
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