Abstract
Integrated design is a trend in the development of afterburners, and the distribution of cold flow is directly related to their flow field characteristics, combustion organization, and the cooling effect of components. Numerical simulations were performed to illustrate the effects of bypass flow distribution on the flow distribution, mixing characteristics, and cooling efficiency of the components by varying the cooling flow path structure parameters. Within the range of parameters in this study, it can be indicated that with the increase of heat shield inlet height and afterburner annulus height, the total pressure recovery coefficient along the path increased accordingly, and the increasing rate at the afterburner outlet is 1.12% and 1.19%, respectively. The average cooling efficiency of radial flameholder, circumferential flameholder, and fuel injector all decrease, but the rate of decrease varies slightly depending on the location of the components. The increase of heat shield inlet height would reduce thermal mixing efficiency by approximately 5.4% at the afterburner outlet, and the increase of afterburner annular height would increase about 2.9%.
Highlights
IntroductionAfterburners are widely used in advanced aero engines in order to meet operational needs
Bypass flow was divided into three parts according to its flow path
The above phenomenon tended to be more evident with the increase of heat shield inlet height r and afterburner annulus height e
Summary
Afterburners are widely used in advanced aero engines in order to meet operational needs. Afterburners increase the maneuverability of aircraft by increasing the thrust of engines in a short period of time at the cost of a higher fuel consumption rate [1]. With the development of aero-engines, afterburner technology is in continuous pursuit of higher combustion efficiency and stability, lower fluid loss, and lighter structural quality [2]. It has been gradually difficult for the traditional afterburner to meet design requirements owing to the inherent defects arising from its structural characteristics [3]. The concept of integrated design of components in the afterburner has become an essential development direction
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