Supersonic congenics?

Shocks in supersonic sand.

We measure time-averaged velocity, density, and temperature fields for steady granular flow past a wedge. We find the flow to be supersonic with a speed of granular pressure disturbances (sound speed) equal to about 10% of the flow speed, and we observe shocks nearly identical to those in a supersonic gas. Molecular dynamics simulations of Newton's laws yield fields in quantitative agreement wi...

Optimum Supersonic Climb

In this paper, a simple, non-sensitive, robust, and accurate computational procedure is presented and it does not require a prior knowledge of a reference trajectory for computing the optimum trajectory for minimum-time-toclimb to a prescribed final altitude of a supersonic aircraft. From the program, we fnst generate the possible range of initial Mach numbers, initial altitudes and climb times...

Highly Focused Supersonic Microjets

Yoshiyuki Tagawa,* Nikolai Oudalov, Claas Willem Visser, Ivo R. Peters, Devaraj van der Meer, Chao Sun, Andrea Prosperetti, and Detlef Lohse Physics of Fluids Group, MESA+ Institute and Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, Netherlands Department of Mechanical Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA (Received 11 De...

Supersonic rupture of rubber

The rupture of rubber differs from conventional fracture. It is supersonic, and the speed is determined by strain levels ahead of the tip rather than total strain energy as for ordinary cracks. Dissipation plays a very important role in allowing the propagation of ruptures, and the back edges of ruptures must toughen as they contract, or the rupture is unstable. This article presents several le...

Supersonic Combustion Ramjet Research