๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Effect of aspect ratios on potential core length for cruciform jet

โœ Scribed by Shigetaka Fujita; Hideo Osaka

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
539 KB
Volume
5
Category
Article
ISSN
0894-1777

No coin nor oath required. For personal study only.

โœฆ Synopsis

This paper documents an experimental study of the mean flow and turbulence characteristics for three-dimensional turbulent free jets of air issuing into still air surroundings from cruciform nozzles with four aspect ratio values (AR = 3,5, 12.5, and 50). The measured quantities comprise streamwise, spanwise, and lateral mean velocities obtained with a Pitot-static pressure tube and a five-hole pressure tube, and the turbulent intensity with both an X-type hot-wire probe and a linearized constant-temperature anemometer. The experimental results reveal the "saddleback" shape of both the streamwise mean velocity and turbulent intensity distributions in the near flowfieid. Potential core lengths nondimensionalized by jet nozzle width d for the cruciform jets are larger than those for two-dimensional and axisymmetric jets. Furthermore, a relationship between the aspect ratio and the potential core length is examined and it is clearly shown that the potential core length could be significantly controlled by the variation of the magnitude of the inward secondary flow velocity on both the y and z axes for the cruciform jets.

๐Ÿ“œ SIMILAR VOLUMES

The effect of aspect ratio on the near-f
The effect of aspect ratio on the near-field turbulent structure of elliptic jets
โœ Sang-Joon Lee; Seung-Jo Baek ๐Ÿ“‚ Article ๐Ÿ“… 1994 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 864 KB

The near-field turbulent structures of elliptic jets issuing from sharp-edged elliptic slot nozzles were experimentally investigated using a 3D LDV system. To examine the effect of the slot aspect ratio on the flow characteristics of the elliptic turbulent jet, we have used elliptic slot nozzles wit

Use of effective core potentials for ab
Use of effective core potentials for ab initio calculations on molecular siloxanes and silicates
โœ Clarke W. Earley ๐Ÿ“‚ Article ๐Ÿ“… 1993 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 996 KB

A series of ab initio electronic structure calculations have been performed on the (H3Si)20 molecule using a range of basis sets. The accuracy of these calculations was evaluated by comparison with several experimental measurements. These calculations support earlier results indicating that polariza

Structural effects on the reactivity of
Structural effects on the reactivity of substituted arylphosphines as potential oxygen-scavenging additives for future jet fuels
โœ Bruce Beaver; Dan Rawlings; P. Neta; Z. B. Alfassi; T. N. Das ๐Ÿ“‚ Article ๐Ÿ“… 1998 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 159 KB ๐Ÿ‘ 1 views

Efforts to develop oxygen-scavenging additives for future jet fuels (JP-900) are presented. Results from radiolytic experiments are used to develop structurereactivity relationships for electron-transfer-initiated oxygenation (ETIO) of variously substituted arylphosphines.