An experimental study of kerosene combustion in a supersonic model combustor using effervescent atomization

Abstract

Investigation of kerosene combustion in a Mach 2.5 flow was carried out using a model supersonic combustor with cross-section area of 51 mm · 70 mm and different integrated fuel injector/flameholder cavity modules. Experiments with pure liquid atomization and with effervescent atomization were characterized and compared. Direct photography, Schlieren imaging, and planar laser induced fluorescence (PLIF) imaging of OH radical were utilized to examine the cavity characteristics and spray structure. Schlieren images illustrate the effectiveness of gas barbotage in facilitating atomization and the importance of secondary atomization when kerosene sprays interacting with a supersonic crossflow. OH PLIF images further substantiate our previous finding that there exists a local high-temperature radical pool within the cavity flameholder, and this radical pool plays a crucial role in promoting kerosene combustion in a supersonic combustor. Under the same operation conditions, comparison of the measured static pressure distributions along the combustor also shows that effervescent atomization generally leads to better combustion performance than the use of pure liquid atomization. Furthermore, the present results demonstrate that the cavity characteristics can be different in non-reacting and reacting supersonic flows. As such, the conventional definition of cavity characteristics based on non-reacting flows needs to be revised.

Simulations of laminar non-premixed flames of kerosene with hot combustion products as oxidiser

“…Despite challenging conditions, laser diagnostic techniques have been used to study high pressure kerosene combustion [30][31][32]. Since preheat and dilution have been shown to alter the heat release characteristics [2,3,6,12], it is essential to investigate the effect of hot product dilution on heat release rate profiles and therefore explore possibilities of experimental markers used to map them.…”

Investigation of Vaporized Kerosene Injection and Combustion in a Supersonic Model Combustor

“…26,27 It was also shown that a higher level of atomization can be achieved by using effervescent atomization, which can further promote the overall burning of kerosene in a supersonic airflow. 27,28 As discussed earlier, with the use of regenerative cooling the liquid fuel could be vaporized before reaching the fuel injector. Even before the temperature is sufficiently high for the fuel to thermally react, the changes in thermophysical properties of the fuel, from saturated liquid to supercritical fluid, are expected to significantly affect the fuel injection process and the subsequent fuel-air mixing and combustion inside the supersonic combustor.…”

Mathematical Modeling and Analysis of Different Type of Fuel Injector in Scramjet Engine Using CFD Simulation in Fluent

“…G. Yu, J.G. Li, J.R. Zhao, et al [8] worked on the topic of "An experimental study of kerosene combustion in a supersonic model combustor using effervescent atomization", and their findings are -The smaller kerosene droplet having higher combustion efficiency. A local high temperature radical pool in the cavity is crucial in promoting the initiation and the subsequent flame holding of the kerosene combustion in a supersonic combustor.…”