DLR Lampoldshausen carried out cold flow tests to study the flow field in a truncated ideal contour nozzle at low nozzle pressure ratios. A convex shaped Mach disk was found for nozzle pressure ratios less than 10 and a slight concave one for nozzle pressure ratios more than 20. Due to boundary layer transition the convex Mach disk is temporary tilted and redirects the flow towards the nozzle w...

Vortex breakdown of swirling, round jet flows is investigated in the compressible, subsonic regime by means of Direct Numerical Simulation (DNS). This is achieved by solving the compressible Navier–Stokes equations on a cylindrical grid using high-order spatial and temporal discretization schemes. The Reynolds number is Re = ρ c w ◦ c R ◦/μ◦c = 5000 and the flow is moderately compressible with ...

Sébastien S. Dufresne, Nicolas A. Dumont, Antoine Boulanger-Piette, Val A. Fajardo, 4 Daniel Gamu, Sandrine-Aurélie Kake-Guena, Rares Ovidiu David, Patrice Bouchard, 5 Éliane Lavergne, Josef M. Penninger , Paul C. Pape, A. Russell Tupling and Jérôme 6 Frenette 7 1 Centre Hospitalier Universitaire de Québec–Centre de Recherche du Centre Hospitalier de 8 l’Université Laval (CHUQ-CRCHUL), Universi...

Phototrophic pigment diversity and picophytoplankton in permafrost thaw lakes 1 2 A. Przytulska, J. Comte, S. Crevecoeur, C. Lovejoy, I. Laurion and W. F. Vincent 3 4 Centre d’études nordiques (CEN) and Département de biologie, Université Laval, Québec City, 5 QC G1V 0A6, CANADA 6 Takuvik Joint International Laboratory, Centre National de la Recherche Scientifique (France, 7 CNRS UMI 3376) and ...

The present work studies the hydro-gasdynamic analogy between a shock wave, occurring in supersonic internal or external compressible flows, and hydraulic jump, sort of normal open-channel flows. It consists an extensive theoretical framework followed by practical analysis, aim which was to experimentally trigger both oblique, while using low-cost designed lab prototype. assembly development, c...

A Southwest Electrostatic Sprayers, Inc., nozzle was configured to a Hudson PortaPak backpack. A test was run to compare deposition of BVA no. 13 oil by the electrostatic nozzle to a standard nonelectrostatic nozzle as collected by Teflon slides. Results indicate that 100% greater deposition occurred with the electrostatic nozzle.

1 Centre Interdisciplinaire de Recherche en Réadaptation et en Intégration Sociale de l’Université Laval, Centre de Recherche de l’Institut Universitaire en Santé Mentale de Québec, Faculté de Médecine, Université Laval, Quebec, QC, Canada 2 Centre Hospitalier le Vinatier, Université de Lyon, F-69003, Université Claude Bernard Lyon I, EA 4615, Bron, Lyon, France 3 Berenson-Allen Center for Noni...

this experiment was conducted to study the effect of nozzle types and the time of herbicide incorporation in soil on weed control, using split plot design by randomized block design. the main plots were soil and herbicide mixing time and the subplots were nozzle types with three replications. this study was performed in karaj station of seed and plant improvement institute, located 25 km west o...

An axisymmetric full Navier-Stokes computational fluid dynamics study is conducted to examine nozzle exhaust jet plume effects on the sonic boom signature of a supersonic aircraft. A simplified axisymmetric nozzle geometry, representative of the nozzle on the NASA Dryden NF-15B Lift and Nozzle Change Effects on Tail Shock research airplane, is considered. The computational fluid dynamics code i...