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Giepman, R.H.M. (author), Schrijer, F.F.J. (author), van Oudheusden, B.W. (author)
) and flow deflection angles (θ 1°-5° or p3=p1 D 1.11-1.64). The laminar interactions revealed a...
journal article 2018
document
Nayak, K. (author), Giepman, R.H.M. (author), Schrijer, F.F.J. (author), van Oudheusden, B.W. (author)
Micro-ramp vortex generators (or micro-ramps) have gained popularity as promising alternatives to boundary layer bleed for high speed flow-control applications. Micro-ramps generate a counter-rotating vortex pair which leads to a more separation resistant boundary layer. Furthermore, they modulate the size of the shock induced separation bubble...
conference paper 2017
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Giepman, R.H.M. (author)
Shock wave-boundary layer interactions are prevalent in many aerospace applications that involve transonic or supersonic flows. Such interactions may lead to boundary layer separation, flow unsteadiness and substantial losses in the total pressure. Flow control techniques can help to mitigate these adverse effects and stabilize the interaction....
doctoral thesis 2016
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Giepman, R.H.M. (author), Schrijer, F.F.J. (author), Van Oudheusden, B.W. (author)
This study investigates the effects of boundary layer transition on an oblique shock wave reflection. The Mach number was 1.7, the unit Reynolds number was 35 × 106 m?1, and the pressure ratio over the interaction was 1.35. Particle image velocimetry is used as the main flow diagnostics tool, supported by oil-flow and Schlieren visualizations....
journal article 2015
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Giepman, R.H.M. (author), Schrijer, F.F.J. (author), Van Oudheusden, B.W. (author)
The effects of micro-ramp height and location on a shock induced separation bubble were quantified using planar particle image velocimetry measurements. Conditional averaging was used to show that the amount of separation is related to the momentum flux in the near-wall region (< 0.5?) of the incoming boundary layer. The momentum flux added to...
conference paper 2013
document
Kotsonis, M. (author), Giepman, R. (author), Veldhuis, L.L.M. (author)
A numerical investigation on the use of plasma actuators for transition control is presented. The numerical framework involves the solution of the full unsteady 2D incompressible Navier Stokes equations using a finite volume formulation. The set of equations is formulated by solving for the perturbations in the flow while a mean laminar boundary...
conference paper 2011
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Giepman, R.H.M. (author), Kotsonis, M. (author)
The mechanical power production and electrical power consumption of the dielectric barrier discharge plasma actuator is investigated for different operating conditions. The ratio of these two values delivers the mechanical efficiency of the actuator as a flow acceleration device. The general trend is that higher carrier frequencies and voltages...
journal article 2011
document
Kotsonis, M. (author), Ghaemi, S. (author), Giepman, R.H.M. (author), Veldhuis, L.L.M. (author)
An experimental investigation on thrust and body force of Dielectric Barrier Discharge (DBD) /plasma actuators aimed at low power flow control applications is presented. A parametric study on thrust is conducted for a wide range of geometrical configurations as well as several electrical operational conditions. Direct measurements of the induced...
conference paper 2010
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