scholarly journals Unsteady Flowfield Characteristics Over Blunt Bodies at High Speed

10.5772/57050 ◽  
2014 ◽  
Author(s):  
R. C.
Keyword(s):  
High Speed ◽  
Blunt Bodies

Hypersonic Swirling Flow past Blunt Bodies

1973 ◽  
Vol 24 (4) ◽  
pp. 241-251 ◽  
Author(s):  
Roger Smith
Keyword(s):  
High Speed ◽  
Swirling Flow ◽  
Pressure Coefficient ◽  
Density Ratio ◽  
Perturbation Expansion ◽  
The Body ◽  
Constant Density ◽  
Flow Past ◽  
Speed Flow ◽  
Blunt Bodies

SummaryThe effect of swirl on the high speed flow past blunt bodies is analysed by assuming constant density in the region between the shock wave and the body. For small swirl the stand-off distance is only slightly affected, but it is shown that there is a critical value of the swirl parameter which, if exceeded, will cause a jump in the position of the shock. This is demonstrated by solving the full constant-density equations for the flow past a sphere and by a perturbation expansion in powers of the density ratio across the shock for a more general body shape. The perturbation solution shows that the pressure coefficient on the body is constant at the critical swirl number.

High-speed flow of a mixture of hydrogen and oxygen over blunt bodies

1973 ◽  
Vol 9 (6) ◽  
pp. 687-690 ◽  
Author(s):  
S. Yu. Chernyavskii ◽  
N. N. Baulin ◽  
A. S. Mkrtumov
Keyword(s):  
High Speed ◽  
High Speed Flow ◽  
Speed Flow ◽  
Blunt Bodies

Experimental Investigation of Water Entry Impact on Hydrophobic Surfaces

2015 ◽  
Author(s):  
Bulent Guzel ◽  
Fatih C. Korkmaz
Keyword(s):  
Experimental Investigation ◽  
Flow Separation ◽  
High Speed ◽  
Water Entry ◽  
Air Entrapment ◽  
Hydrophobic Surfaces ◽  
Blunt Bodies ◽  
Drop Tests ◽  
Set Up ◽  
The Impact

The results of an experimental investigation on hull bottom slamming of three different geometries, sphere, cylinder and wedge, with hydrophobic surfaces are presented. In water entry of blunt bodies, different fluid dynamics phenomena like jet formation, cavity formation, water splashing, flow separation on solid surfaces and air entrapment between solid and liquid surface have been studied for decades. Our study is aimed at understanding and modeling the dynamics of slamming under an extended range of parameters including hydrophobic surfaces. In this study, drop tests have been set up for hull bottom slamming by dropping a body from various heights toward water surface. From digital images captured using a high speed camera, flow separation and water splashing at different velocities are observed and spreading diameters and entrance characteristics are measured during the impact process. At the same time, we measure the pressure distribution on the surface of the bodies during impact via strain gages.

The High Speed Flow of Gas Around Blunt Bodies

1958 ◽  
Vol 9 (4) ◽  
pp. 313-330 ◽  
Author(s):  
Hyman Serbin
Keyword(s):  
Mach Number ◽  
High Speed ◽  
Free Stream ◽  
Density Ratio ◽  
Normal Shock ◽  
High Speed Flow ◽  
Specific Heats ◽  
Speed Flow ◽  
Blunt Bodies ◽  
Free Stream Mach Number

SummaryA number of results derived by the author in earlier reports on the flow of air around blunt bodies moving at high speed are here collected in a unified analysis. The theory predicts in a satisfactory way the shock shape and detachment distance for two blunt bodies, a flat disc and a sphere. It is shown that the density ratio across a normal shock is a useful parameter, combining the effects of both the free stream Mach number and the ratio of specific heats.

Simplified CFD based Approach for Estimation of Heat Flux over Wedge Models in High Speed Plasma Flows

2017 ◽  
Vol 67 (5) ◽  
pp. 497
Author(s):  
L. Aravindakshan Pillai ◽  
Praveen Nair
Keyword(s):  
Heat Flux ◽  
Numerical Simulations ◽  
High Speed ◽  
Complex Flow ◽  
Plasma Flows ◽  
Flow Physics ◽  
Blunt Bodies ◽  
Real Gas Effects ◽  
Computational Fluid Dynamics Cfd ◽  
Simplified Procedure

<p>Analysis of plasma flows at hypersonic velocity over blunt bodies is quite complex and challenging as it involves complex flow physics and carries several uncertainties. Simultaneous simulation of all the parameters as existing in re-entry flight puts constraints on most of the ground based experiments. Numerical simulations, on the other hand, require modelling of ionisation and real gas effects and prove to be computationally costly. This paper highlights the development of unstructured, cell centred second order accurate parallel version of in-house computational fluid dynamics (CFD) solver where high temperature equivalent properties used from Hansen’s 7 species model and establishment of a simplified procedure for estimation of heat flux over wedge models tested in Plasma Wind Tunnel facility, Vikram Sarabhai Space Centre. Numerical simulations were carried out for Plasma tunnel initially to get the flow properties inside the tunnel when operated without any model. A simplified CFD based approach is established for computing the heat flux over the bodies tested inside the tunnel and compared with the measured data. The comparison of numerical and measured values shows that the proposed methodology captures the flow physics and various parameters with acceptable levels of accuracy.</p>

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