A supersonic relative velocity between dark matter (DM) and baryons (the stream velocity) at the time of recombination induces formation low mass objects with anomalous properties in early Universe. We widen scope `Supersonic Project' paper series to include we term Dark Matter + Gas Halos Offset by Streaming (DM GHOSts)--diffuse, DM-enriched structures formed because a physical offset centers ...

We prove the existence of a solution of a free boundary problem for the transonic small-disturbance equation. The free boundary is the position of a transonic shock dividing two regions of smooth flow. Assuming inviscid, irrotational flow, as modeled by the transonic small-disturbance equation, the equation is hyperbolic upstream where the flow is supersonic, and elliptic in the downstream subs...

We report noise measurements for perfectly expanded coaxial jets composed of a supersonic primary stream at velocity of 920 m/s and a co ow stream at conditions designed to prevent formation of Mach waves. Both the primary and secondary streams consisted of helium–air mixtures to simulate approximately the conditions of hot  ows. The resulting sound Ž eld was compared to that emitted by a sin...

The role of condensation on the shape and size a supersonic argon stream flowing from nozzle into rarefied space is considered. It shown that with growth cluster sizes, both primary "traditional" jet external flow formed when heavy clusters penetrate through lateral compressed layers surrounding background gas increase. type correction factor in well-known empirical formula pr...

The thermodynamics and acoustics of a fixed-cycle, bypass ratio 3 supersonic engine with an innovative noise suppression scheme is explored. The silencing method entails installation of variable turning vanes in the bypass exhaust of a separate-flow turbofan engine. During noise-sensitive segments of flight, the vanes impart a slight downward tilt to the bypass plume relative to the core plume,...

On the basis of resonance theory the possibility of the longitudinal structures generation was fixed in the compressible boundary layer by an external vorticity. It takes place under a condition when parameters of externally vortex wave become the close to parameters of eigen stationary perturbations of a boundary layer. Researches are conducted as in case of subsonic numbers of the Mach, and i...

Over the last ten years, robustness of schemes has raised an increasing interest among the CFD community. The objective of this article is to solve the quasi-one-dimensional compressible flow inside a “Shubin nozzle” and to investigate Bean-Warming and flux vector splitting methods for numerical solution of compressible flows. Two different conditions have been considered: first, there is a sup...

The aim of this work is to analyze a viscous flow in the axisymmetric nozzle taken into account the mesh size both in the free stream and into the boundary layer. The resolution of the NavierStokes equations is realized by using the finite volume method to determine the supersonic flow parameters at the exit of convergingdiverging nozzle. The numerical technique uses the Flux Vector Splitting ...

Direct numerical simulation is used to investigate the effect of compressibility on roughness-induced boundary layer transition. Computations are performed in both the lowand the high-speed regime (at free-stream Mach number Me = 2) for an isolated three-dimensional element with cubic shape and for two-dimensional roughness strips. For each configuration two values of the roughness height Reyno...

This is a summary of significant accomplishments in investigations on the dispersion, mixing, and combustion in uniformand variable-density air-breathing high-speed propulsion flows related to scramjet propulsion. In experimental work, progress made in the development of testsection modifications allowed inclined-jet injection in supersonic flow to be studied with and without chemical reactions...