Turbulence in the fast lane.(Hypersonic Aircraft)

From: USA Today (Magazine) | Date: June 1, 2005 | Copyright information

Although NASA's X-43A and other hypersonic airplanes uses air-breathing engines and fly much like 747s, there is a big difference between ripping air at Mach 10 (around 7,000 mph) and cruising through it at 350 mph. These differences are even more pronounced when hypersonic aircraft sip rarified air at 100,000 feet, while commercial airliners gulp the much thicker stuff at 30,000.

Aerothermodynamic heating is a very big deal at Mach 10. The critical point comes where air...

Read all of this article with a FREE trial to HighBeam Research

Related newspaper, magazine, and journal articles from HighBeam Research

Turbulence in the Fast Lane
USA Today ; Although NASA's X-43A and other hypersonic airplanes use air-breathing engines and fly much like 747s, there is a big difference between ripping air at Mach 10 (around 7,000 mph) and cruising through it at 350 mph. These differences are even more pronounced when hypersonic aircraft sip rarified air
Collisions of small drops in a turbulent flow. Part I: Collision efficiency. Problem formulation and preliminary results
Journal of the Atmospheric Sciences ; ABSTRACT A mathematical approach to the calculation of the collision efficiency between droplets within a turbulent flow is suggested. The problem of drops' hydrodynamic interaction is reconsidered taking into account additional inertia-induced relative velocities between droplets of different
Pinning down turbulent flow via new formula.(computing)(Brief Article)
Mechanical Engineering-CIME ; TO MOST PEOPLE, turbulence is the rolling and jolting that airplane passengers sit through as their jet moves through a rough pocket of air. But to engineers and scientists, turbulence is the chaotic flow of a gas or liquid in which parts of the current curl into irregular, ever smaller and tighter
Pinning Down Turbulent Flow Via New Formula
Mechanical Engineering ; TO MOST PEOPLE, turbulence is the rolling and jolting that airplane passengers sit through as their jet moves through a rough pocket of air. But to engineers and scientists, turbulence is the chaotic flow of a gas or liquid in which parts of the current curl into irregular, ever smaller and tighter
Eductor redux.(PLATING CLINIC)
Products Finishing ; Q. We are looking for a better way to agitate our plating baths. Currently we are using air agitation but one of our vendors has suggested using eductors. Should we and if so, why? S. W. A. The short answer to your question is an unequivocal yes. I addressed this question in one of my earlier
Errata
Water Environment Research ; In Bechtel, T B. (2005) A Computational Technique for Turbulent Flow of Wastewater Sludge. Water Environ. Res., 77, 417, the x-axis on Figure 2 should be labeled y/R rather than y (m).
Collisions of Cloud Droplets in a Turbulent Flow. Part V: Application of Detailed Tables of Turbulent Collision Rate Enhancement to Simulation of Droplet Spectra Evolution
Journal of the Atmospheric Sciences ; ABSTRACT The present study is a continuation of the series of studies dedicated to the investigation of cloud droplet collisions in turbulent flow with characteristics that are typical of real clouds. Detailed tables of collision kernels and collision efficiencies calculated in the presence of
Collisions of Small Drops in a Turbulent Flow. Part III: Relative Droplet Fluxes and Swept Volumes
Journal of the Atmospheric Sciences ; ABSTRACT Swept volumes of cloud droplets with radii below 20 m are alculated under conditions typical of atmospheric cloud turbulence characterized by enormous values of Reynolds numbers, high turbulent intermittency, and characteristic values of the dissipation rate. To perform the calculations,
State of the art agitations.(painting clinic)
Products Finishing ; Q. My chemical vendor has recommended using eductors to agitate my plating solutions. Can you tell me more about this agitation process? Is it expensive to install? How does it compare to air agitation? M.A. A. Your vendor is giving you good advice. Using eductors gives you much improved agitation
Collision Rates of Cloud Droplets in Turbulent Flow
Journal of the Atmospheric Sciences ; ABSTRACT Direct numerical simulations of an evolving turbulent flow field have been performed to explore how turbulence affects the motion and collisions of cloud droplets. Large numbers of droplets are tracked through the flow field and their positions, velocities, and collision rates have been