Parametric study of a Mach 1.3 cold jet excited by the flapping mode using plasma actuators

Speth, Rachelle; Gaitonde, Datta V.

doi:10.1016/j.compfluid.2013.04.028

Cited by 45 publications

(44 citation statements)

References 42 publications

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“…The algorithms described above have been validated previously on the simulation of plasma-based flow control applied to PE supersonic jets (Gaitonde and Samimy 2011;Speth and Gaitonde 2013;Gonzalez, Gaitonde, and Lewis 2014).…”

Section: Numerical Methods and Models For Controlled Jet Lesmentioning

confidence: 99%

“…Perfectly expanded Under-expanded approach was assumed due to the very thin exit boundary layer present in experiments and has been shown in previous numerical studies (Gaitonde 2012;Speth and Gaitonde 2013) to be a reasonable approximation. For the UE jet model, a characteristic subsonic inflow condition based on the outgoing Riemann invariant and specified stagnation conditions (Blazek 2001) was incorporated.…”

Section: Parametersmentioning

confidence: 99%

“…A relatively thick nozzle lip is accounted for in this model, replicating the experimental set-up more accurately. The grid resolution criteria were taken from prior studies reported by Gaitonde and Samimy (2011) and Speth and Gaitonde (2013). Table 1 shows the parameters associated with each grid: the PE case Downloaded by [New York University] at 23:24 16 June 2015 is resolved with 31 million points while the UE case requires 54 million points.…”

Section: Computational Gridsmentioning

confidence: 99%

“…For the asymmetric control simulations, the initial actuation scheme chosen fires actuators {1, 2, 8}, as shown in Figure 2(c), at a predetermined frequency and duty cycle. This actuation scheme is derived from the firstflapping mode (m = ±1) of actuation -discussed in detail in Speth and Gaitonde (2013) -by ignoring the {4, 5, 6} actuator set that fires 180º out of phase with the top three actuators. …”

Section: Actuator Modelmentioning

confidence: 99%

“…The plasma actuators, which are the focus of this effort, have proven very effective at imposing symmetric control of perfectly expanded (PE) Mach 1.3 and Mach 0.9 jets (Samimy et al 2007;Samimy and Adamovich 2010;Gaitonde and Samimy 2011;Speth and Gaitonde 2013) at Reynolds numbers of order one million based on jet diameter. In this work, we extend the analysis to asymmetric control for PE conditions.…”

Section: Introductionmentioning

confidence: 99%

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Large-eddy simulations of plasma-based asymmetric control of supersonic round jets

González

Gaitonde

Lewis

2015

International Journal of Computational Fluid Dynamics

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Localised arc filament plasma actuators are modelled with a validated technique to examine asymmetric control of a perfectly expanded round free jet to deflect its downstream trajectory. The nominal Mach and Reynolds numbers are 1.3 and 1 million, respectively. No-control, symmetrically controlled, and under-expanded jets are also simulated for comparison purposes. Parametric variation of actuation frequency and duty cycle indicate that asymmetric control can alter the trajectory, and, within the confines of the parameters investigated, the optimal forcing scheme was found to correspond to the jet's columnmode frequency and a duty cycle of approximately 60%. Increasing frequency and duty cycle beyond these values have a detrimental effect on control, which is consistent with experimental findings. Asymmetric actuation resulted in significant mixing enhancement on the actuated side, as evidenced by the increased growth rate of the non-dimensional momentum thickness. The effectiveness of control is reduced for under-expanded jet conditions.

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Section: Numerical Methods and Models For Controlled Jet Lesmentioning

confidence: 99%

Section: Parametersmentioning

confidence: 99%