Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.
A concept of mixing enhancement forced by rotating ramps
has been presented, which based on the design of stationary
ramps and Rim-Rotor Rotary Ramjet Engine. The rotating
ramps could generate large scale vortex and rotary moving
shock waves, which may increase the fuel mixing rate and
spread distance in transverse-direction. The commercial
software Fluent has been conducted to study the effect of
different velocity of ramps rotating on flowfield characteristics.
The results show that rotating ramps increase the periodic
oscillation of cavity shear layer and induce large streamwise
vortices in cavity. When the ramps rotate at a speed of
54.3krpm, the peak value of x-vortex magnitude is nearly four
times as the stationary ramps, however, the coefficient of total
pressure recovery in the rotating ramps case is nearly 10% less
than that in the stationary ramps case. This study provides a
new method for mixing enhancement under supersonic airflow
condition.
