Aerodynamics

PM&AM Research’s fluids capabilities range from microfluidics to hypersonic flow. Incorporating reactive species and inhomogeneous initial conditions into these flows allows us to study phenomena with a variety of applications.

Significant Drag Reduction indicates that our method can revolutionize supersonic and hypersonic flight.

Drag Reduction

Our drag reduction technology presents the possibility to eliminate more than 90% of the drag when flying at supersonic/hypersonic speeds. The process also saves energy, allowing not only faster but also more efficient flight. Further benefits are reduced emission and noise from supersonic/hypersonic platforms. Pertinent publications and patents pertaining to our drag reduction technology include:

Supersonic/Hypersonic Control

Our hypersonic control technology is closely linked to our drag reduction technology. The control is achieved quite simply by reducing the drag in the direction in which we would like the vehicle to fly. This approach allows the entire airframe to be used as the control surface, obviating the need for vulnerable high-speed flaps that require strong actuators and mechanisms. The control extends to separation from supersonic/hypersonic platforms, as well as for ensuring that the vehicle is aligned with the direction of flight. Pertinent publications and patents pertaining to our supersonic/hypersonic control technology include:

Internal Flows

Internal flow applications are typically governed by shock dynamics and chemical kinetics, both of which can be positively affected with dramatic effect by the energy deposition techniques we have patented.

Shockwave Dynamics and Control

A main concern for modern high-speed flight is the control of shock waves. Significant interest has grown from our demonstration that the effect of ionization on shock propagation is primarily a result of the heating undergone by the gas during the ionization process (AIAA-2000-2700, Physica D 163 (2002) 150-165). The contour plots to the left are of entropy (top), density (middle), and pressure (bottom). A shock wave is moving in a shock-tube to the right, followed by a contact discontinuity, which is heavily distorted due to the Richtmyer-Meshkov Instability. The quiescent gas to the right of the shock wave has an inhomogeneous temperature profile transverse to the direction of propagation. Along the axis of the shock-tube, the gas is hotter, which makes it less dense. Near the shock-tube walls, the gas is cooler, which makes it more dense. This results in a bowing of the shock and other very interesting fluid dynamics.

Vorticity

In all of our fluid dynamics problems, we investigate vorticity generation and the resulting vortex dynamics to help us understand and manipulate phenomena of interest (AIAA 99-0871). This is one of the many connections between our group and the mathematics programs at the University of Arizona and the University of Warwick.

Convection in Solidification Problems

In our experimental and numerical studies of dendritic growth and solidification of NH4Cl(aq), it has been necessary to investigate the fluid flow surrounding the dendrites.

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