Shock tunnel high-speed photography and CFD calculations on spike-tipped bodies

Srulijes, J.; Gnemmi, Patrick; Seiler, F.; Runne, K.

doi:10.1117/12.516788

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…With the increase of angle of attack, traditional shock wave needle drag reduction effect decreases rapidly. For more than 15° angle of attack, almost all shock wave needle configurations create higher resistance shock wave needle without shape [67][68] . Schülein etc [69] found shock needle deflection angle and direction can't be ensured relying on the pitot pressure data.…”

Section: Jet Drag Reduction Technologymentioning

confidence: 99%

Drag Reduction Technology of Jet - A Review

Fan

Mou

et al. 2015

JERA

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With the development of world’s economy, energy shortage gradually appears. Resistance has a great influence on energy consumption. In other words, drag reduction means saving energy. Development of the drag reduction technology plays a very important role to improve the energy efficiency. Therefore, drag reduction technology of jet has become a hot research field. Drag reduction technology of jet is applied on the surface, so as to reduce surface friction resistance. Through analyzing the necessity of energy efficiency increase and jet drag reduction theory improvement, research progress of lateral jet flow technology and drag reduction technology of jet in the field of aircraft are reviewed. Besides, a main trend on the drag reduction technology of jet research is presented.

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Section: Jet Drag Reduction Technologymentioning

confidence: 99%

Drag Reduction Technology of Jet - A Review

Fan

Mou

et al. 2015

JERA

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“…The commercial CFD codes were also used to assist and support the experimental results conducted by many researchers such as Gnemmi et al [4,57] and the co-researchers of P. K. Reddy. [1,10,56,58].…”

Section: B Numerical Simulation Studiesmentioning

confidence: 99%

“…[1,10,56,58]. Gnemmi et al [4,57] experimentally studied the flow around spiked hemisphere cylindrical models in a Mach 4. ).…”

Section: B Numerical Simulation Studiesmentioning

confidence: 99%

Aerothermodynamics of Spiked Bodies: Part I

Ahmed¹,

Qin

2011

International Conference on Aerospace Sciences and Aviation Tec

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Among a variety of design requirements, reducing the drag and aeroheating on hypersonic vehicles are the most crucial. Unfortunately, these two objectives are often conflicting. On one hand, sharp slender forebodies design reduces the drag and ensures longer ranges and more economic flights. However, they are more vulnerable to aerodynamic heating. On the other hand, blunt forebodies produce more drag however, they are preferred as far as aeroheating is concerned. In addition, in the context of hypersonic vehicles, blunt geometries are preferred over slender ones for practical implications such as higher volumetric efficiency, better accommodation of crew or on-board equipment.

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“…The assumption of flow axisymmetry was adopted in all the numerical studies of the stable flow mode around spiked bodies. These studies involved spiked bodies of various shapes such as blunt cones (1,3,4,16,17) , blunt ogives (18) , hemispheres (3,8,14,(19)(20)(21)(22)(23)(24)(25)(26) , flat cylinders (23,(27)(28)(29)(30) , pointed cones (30) , Figure 1. Macroscopic features of the flowfield ahead of a blunt body in hypersonic speeds (a) without (11) , and (b) with the spike/ aerodisk (12) .…”

Section: Introductionmentioning

confidence: 99%

Investigation of flow asymmetry around axi-symmetric spiked blunt bodies in hypersonic speeds

Ahmed

Qin

2014

Aeronaut. j. (1968)

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The assumption that a zero-incidence flow around bodies of revolution is axisymmetric has been broadly adopted by many researchers, even for cases where the flow around such bodies becomes unstable. In this study, the validity of this assumption is revisited using CFD simulation. As a case study, the simulations of both stable and unstable hypersonic flows around spiked blunt bodies in 2D axisymmetric and full 3D computational domains are compared. It is found that, for the stable flow cases, the main flow features are apparently axisymmetric and the assumption is generally acceptable. However, some degree of asymmetry can be observed inside the shear layer in the separated region, causing small variation in the drag coefficient. For the unstable flow cases, the asymmetry of the flow features is much more significant. More importantly, the assumption that the flow is axisymmetric is found to overestimate the level of flow unsteadiness. The amplitude of temporal drag variation as predicted by the axisymmetric solution is higher than that predicted by the full 3D solution.

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Shock tunnel high-speed photography and CFD calculations on spike-tipped bodies

Cited by 6 publications

References 2 publications

Drag Reduction Technology of Jet - A Review

Drag Reduction Technology of Jet - A Review

Aerothermodynamics of Spiked Bodies: Part I

Investigation of flow asymmetry around axi-symmetric spiked blunt bodies in hypersonic speeds

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