Numerical Studies of a Fluidic Diverter for Flow Control

Numerical Studies of a Supersonic Fluidic Diverter Actuator for Flow Control

“…We have shown in our previous work on subsonic flows that the time for the first onset of instability leading to oscillations, called the start delay time, is shorter for faster flows and levels off as the sonic velocity is approached (Ref. 19). This trend is demonstrated for different gases like air and helium and for different operating temperatures of the same gas, also suggesting that the phenomenon is related to acoustic speed.…”

“…Our previous study, which was limited to subsonic flows (Ref. 19), is extended to include high-speed flows through the internal passages leading to supersonic exit velocities. This study includes cases with supply-to-ambient pressure ratios up to 17.1, corresponding for isentropic air flows to Ma < 2.5, where Ma is the Mach number.…”

“…19). For the supersonic, compressible turbulent flow cases studied here, solution-adaptive grid refinement is employed based on local pressure gradients in order to accurately locate the shocks and resolve the pressure amplitudes.…”

Numerical Simulation of Fluidic Actuators for Flow Control Applications

“…The fluidic actuators under consideration here are closely related to the ones examined by Gokoglu et al [8][9][10] The primary difference in the current configuration is the absence of the divider section used in their work to create twin outlets for the fluid to exit. In the current configuration, which is simpler to fabricate and is being used in several practical applications, the jet comes out of a single outlet, as sketched in Fig.…”

“…Flow characteristics of similar actuators have been examined by Gokoglu et al in a series of papers. [8][9][10] These will be referred to as Type I, 124D and 90D actuators, or for simplicity as 124D and 90D actuators.…”