The present work involves measurements to examine the effects of initial conditions on aerodynamic and acoustic characteristics of a Jet at M=0.8 by changing the orientation of sharp edged orifice plate. A thick plate with chamfered orifice presented divergent and convergent openings when it was flipped over. The centerline velocity was found to decay more rapidly for divergent orifice and that...

A new design concept is introduced to control the near-wall integration between the hot-gas boundary layer and the cooling jets in order to enhance the adiabatic film cooling effectiveness of the gas turbine blades. In this new approach, another film cooling port, having a very low blowing ratio, which prevents formation of the counter-rotating vortex pare, is applied just upstream of the main ...

The generic equilibrium configuration of the nighttime midlatitude ionosphere consists of an F layer held up against gravity by winds and/or electric fields, and a sporadic E (Es) layer located by a sheared wind field, which experiences the same electric fields as the F layer. This configuration is subject to two large-scale (e.g. >10 km) “layer instabilities”: one of the F layer known as the P...

This study investigates: (i) how the local meridional (Hadley) and zonal (Walker) circulations change in each phase of Madden-Julian Oscillation (MJO); (ii) effect enhanced suppressed MJO-related convection on poleward extent Hadley and, thus, strengths positions subtropical jets. We examine these effects ERA-Interim reanalysis by decomposing vertical mass flux into components. show for first t...

In this study, we investigate the interaction between the tropical Intraseasonal Oscillation (ISO) and midlatitude atmospheric low-frequency variability, using observational data and numerical models, with a special emphasis on the role of the synoptic eddy feedback. A statistical closure for the synoptic eddy-to-low frequency flow feedback is constructed, based on a singular value decompositio...

This second of two papers on extratropical transition (ET) over the southwest Pacific Ocean focuses on the variability of ET. A climatology of ET onset based on a previously described objective technique shows that ET commences 158 of latitude nearer the equator on average than similar cases from the Northern Hemisphere. Characteristic midlatitude circulation patterns accompanying ET near 308S ...

Understanding and predicting changes in storm tracks over longer time scales is a challenging problem, particularly in the North Atlantic. This is due in part to the complex range of forcings (land–sea contrast, orography, sea surface temperatures, etc.) that combine to produce the structure of the storm track. The impact of land–sea contrast and midlatitude orography on the North Atlantic stor...

a fluid, which is stable under the action of buoyancy, can oscillate under the influence of buoyancy and coriolis forces. the resulting ageostrophic oscillations with a frequency between coriolis and buoyancy frequencies are called inertia-gravity waves, hereafter igws. in this study we investigate the generation and propagation of igws over iran. to this end, the weather research and forecasti...

A liquid jet can stably bounce off a sufficiently soft gel by following the contour of the dimple created upon impact. This new phenomenon is insensitive to the wetting properties of the gels and was observed for different liquids over a wide range of surface tensions, γ=24-72  mN/m. In contrast, other jet rebound phenomena are typically sensitive to γ: only a high γ jet rebounds off a hard sol...

Abstract The Siberian storm track is one of the drivers East Asian extreme weather events. Using daily JRA‐55 reanalysis data from 1980 to 2021, this study examines roles eddy generation and jet characteristics in setting annual cycle track. It found that there are two peaks intensity boreal spring autumn. possible reason for such an explored by analyzing maximum Eady growth rate over region ch...