Theoretical prediction of base pressure for steady base flow

Tanner, M.

doi:10.1016/0376-0421(73)90006-7

Cited by 26 publications

(5 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the combustion temperatures interval from 2050 K to 2587 K it can be concluded that the molecular weight has a significant role in terms of drag reduction. This was verified in [9,27,28].…”

Section: The Effect Of the Combustion Temperaturesupporting

confidence: 54%

Optimization of artillery projectiles base drag reduction using hot base flow

Amin

Jaramaz

2019

Therm sci

View full text Add to dashboard Cite

The CFD numerical simulations were carried out to investigate the base drag characteristics of a projectile with base bleed unit with a central jet. Different base bleed grain types with different combustion temperatures were used. The goal was to find a way to effectively control the base flow for base drag reduction and optimisate the latter using an adequate CFD software. Axisymmetric, compressible, mass-averaged Navier-Stokes equations are solved using the k-ω SST, transition k-kl-ω, and RSM turbulence models. The various base flow characteristics are obtained by the change in the non-dimensionalized injection impulse. The results obtained through the present study show that there is an optimum bleed condition for all base bleed grains tested. That optimum is dependent on the temperature of the grain combustion products. The optimum reduces the total drag for 6,9% in the case of air injection at temperature of 300 K and reaches up to 28% in the case of propellant combustion products injection at almost 2500 K. Besides, the increasing of molecular weight has a role no less important than temperature of the combustion products in terms of base drag reduction.

show abstract

Section: The Effect Of the Combustion Temperaturesupporting

confidence: 54%

Optimization of artillery projectiles base drag reduction using hot base flow

Amin

Jaramaz

2019

Therm sci

View full text Add to dashboard Cite

show abstract

“…Modifications of the Ch-K criterion have been proposed, eg. by Sirieix et al, and other approaches to the base-pressure problem have been explored; for example, Tanner [15] developed a "wake-outflow" concept which focusses attention on the entrainment into the free shear layers and looks for a momentum balance with the pressure forces. In the following, we explore a model in which the momentum balance is between pressure and shear-stress forces, as initially proposed by Sychev [6] in his attempt to develop an asymptotic (Re --.…”

Section: T T Imentioning

confidence: 99%

“…7 which has been constructed from the numerical solutions by Plesset and Shaffer [19] of the Riabouchinsky free-streamline model for wedges. Variation of the wedge half angle, 1 a,,,, from 0 (step flow) to 900 (flat plate) tracks a significant bluffness parameter [15], namely the direction in which the separating streamline ip = 0 leaves the body; eg. parallel to the free-stream direction for the step flow and perpendicular for the flat plate.…”

Section: Bluff-body Flowsmentioning

confidence: 99%

Free Shear Layers, Base Pressure and Bluff-Body Drag

Roshko¹

1993

View full text Add to dashboard Cite

Incompressible, non-vortex-shedding bluff-body flows and supersonic base-pressure flows are discussed from a unified viewpoint in which the aspect ratio of the near wake is determined from the balance of shear-stress and pressure forces on the near-wake boundary. The base pressure and drag are then determined from free-streamline theory. The analysis is incomplete, for want of sufficient information about conditions in reattaching supersonic turbulent shear layers.

show abstract

“…1). Let the equation of the surface of the wedge be z=Ax) (1) The surface is divided into a large number of panels, as shown in Fig. 1, on each of which vorticity singularities are distributed.…”

Section: Model Without Dispersion Of Vorticity In the Wakementioning

confidence: 99%

Separated flow about a wedge

Mukherjea

Bandyopadhyay

1990

Aeronaut. j.

View full text Add to dashboard Cite

A numerical method, based on the panel technique, has been developed for calculating the time-averaged separated flow about a wedge. The mathematical model, with constant vorticity in the wake, gives an infinite extension of the wake and constant base pressure while incorporation of the dispersion of vorticity in the wake into the mathematical model leads to its finiteness and non-uniform under-pressure. Experimental tests have been conducted in a low speed wind tunnel on models haying different wedge angles. The theoretical and experimental results agree closely for different configurations and specific values of dispersion factors. However, the agreement for base pressure is poor.

show abstract

Theoretical prediction of base pressure for steady base flow

Cited by 26 publications

References 27 publications

Optimization of artillery projectiles base drag reduction using hot base flow

Optimization of artillery projectiles base drag reduction using hot base flow

Free Shear Layers, Base Pressure and Bluff-Body Drag

Separated flow about a wedge

Contact Info

Product

Resources

About