Numerical Study on the Enhancing Effects of Bump Turbulence Structures on Wave Rotor Combustor

Abstract

Enhanced combustion technology is identified as a method that can improve both combustion efficiency and energy utilization. In this article, a bump turbulence structure designed for the channels of a wave rotor combustor is introduced. The effects of the bump turbulence structure are compared with those of a traditional straight-plate structure of equivalent height. The mechanisms through which the bump turbulence structure influences the flow field and accelerates the flame are analyzed, and the impact of various positions of the bump turbulence structure on combustion outcomes is explored. The analysis of results indicates that the bump structure exhibits superior advantages over the straight-plate structure when considering both pressure loss and enhanced combustion effects. The bump structure alters the pressure distribution within the channel, increasing disturbances in the flow field and creating a positive feedback mechanism with flame acceleration. The initial position of the bump structure influences the speed of flame propagation within the channel. When the bump structure is positioned close to the ignition source, a notable acceleration of the flame is observed during the initial stages of combustion. Conversely, when the bump structure is situated away from the ignition source, a significant flame acceleration is evident during the later stages of combustion. For the channels of wave rotor combustors, there should be an optimal position of the bump structure to maximize the effect of flame acceleration.