Experimental investigation on spiked body in hypersonic flow

Kalimuthu, R.; Mehta, R. C.; Rathakrishnan, E.

doi:10.1017/s0001924000002554

Cited by 86 publications

(57 citation statements)

References 14 publications

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“…The drag reduction experienced by spiked blunt bodies was explained by the size of the recirculation zone, which screens a considerable portion of the main body [1,3,12]. Increasing the spike length causes the reattachment point to move further downstream along the main body surface and the recirculation zone to expand, covering a larger area of the main body; consequently, a further drag drop is achieved.…”

Section: Models With Sharp Spikesmentioning

confidence: 99%

“…1c. It has been proved that a spike with an aerodisk overperformed the plain pointed aerospike in terms of drag and aerodynamic heating reduction [1][2][3][4].…”

mentioning

confidence: 99%

“…It is noted that all these studies focused on pointed spikes. Nevertheless, hemispherical and flat aerodisks along with pointed spikes in a turbulent hypersonic (M 1 6) flow were recently investigated experimentally by Kalimuthu et al [3] and reproduced numerically by Mehta [4]. The aerodisks had a fixed size and the L=D varied up to 2.…”

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confidence: 99%

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Drag Reduction Using Aerodisks for Hypersonic Hemispherical Bodies

Ahmed

Qin

2010

Journal of Spacecraft and Rockets

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The main challenge facing the designers of hypersonic vehicles is the significantly high levels of pressure drag and aerodynamic heating. Although blunt noses are preferred for better heat distribution, they introduce substantial drag to the vehicle. Spikes and aerodisks proved to be efficient drag and heating reduction devices. However, for some flow conditions and model designs, the flow around spiked bodies can be unstable, which deteriorates their effectiveness. In the present study, a numerical investigation was conducted on a hemispherical body equipped with a spike of variable length and a hemispherical aerodisk of variable size in laminar hypersonic freestream conditions. A mechanism is proposed to explain the drag reduction and the cause of flow instability based on the shape of an effective body. In addition, the dependence of drag reduction on the spike's detailed design was investigated. For the models investigated in this work, an optimum aerodisk size produced the minimum drag and this optimum size was found to be inversely proportional to the spike length. Nomenclature b = arc length of half a semicircle, m C D = drag coefficient D = main body diameter, m d = aerodisk diameter, m L = spike length, m M = Mach number P = pressure, Pa q = dynamic pressure, Pa Re = Reynolds number S = surface area, m 2 s = distance along the surface, m T = temperature, K V = flow velocity, m=s = inclination of separation shock wave = specific heat ratio = efficiency of compression = inclination of the dividing streamline = dynamic viscosity, kg=m s = density, kg=m 3 Subscripts d = value inside the recirculation zone inf, 1 = freestream value o = total, stagnation value p = peak value r = reattachment value ref, = reference value

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Section: Models With Sharp Spikesmentioning

confidence: 99%

“…1c. It has been proved that a spike with an aerodisk overperformed the plain pointed aerospike in terms of drag and aerodynamic heating reduction [1][2][3][4].…”

mentioning

confidence: 99%

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Drag Reduction Using Aerodisks for Hypersonic Hemispherical Bodies

Ahmed

Qin

2010

Journal of Spacecraft and Rockets

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“…Menezes et al [4] tested the e ectiveness of spikes on blunt faced cones at M = 5:75, and could achieve a drag reduction of the order 65% with a at faced aerodisc spike. Mach 6.0 experiments with variations in geometrical parameters of spike and di erent shapes were tested by Kalimuthu et al [5], who reported that the aerodisc con guration performed better than aerospikes. However, in the same line, Kalimuthu and Rathakrishnan [6] reported that with a hemispherical aerospike at L=D = 2:0, there was a drag reduction of about 78%.…”

Section: Introductionmentioning

confidence: 99%

Hypersonic Flow over Hemispherical Blunt Body with Spikes

2018

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Abstract. Use of spike on a hemispherical body changes the ow eld and hence, the aerodynamic drag. Computational studies have been carried out to obtain the ow eld around a hemispherical body with spikes at a hypersonic Mach number of 6. The e ect of shape of spike tip and length has been studied. Laminar computations have been made adopting structured grid using commercial software FLUENT. It is observed that use of a sharp spike itself reduces the drag signi cantly. However, the use of a hemispherical head spike further reduces the drag. Contribution of di erent components towards drag indicates that the increase in length of a spike does not change the spike contribution. However, the ow eld on main body is altered, which leads to reduction in drag with change in length. The estimated maximum drag is found to be highest among all reported drag values with any spike shape and length in the literature.

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“…Besides, Konstantin and Federico [9] conducted the numerical simulations with respect to it. Kalimuthu et al [10] conducted the experiment about drag reduction, using blunt bodies with hemispherical, flat and pointed aerodisks in hypersonic flow condition. Their results were also validated by Mehta [11].…”

Section: Introductionmentioning

confidence: 99%

Drag Reduction Optimization for Hypersonic Blunt Body with Aerospikes

Wan¹,

Cm²

2017

J Aeronaut Aerospace Eng

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Pressure drag and aeroheating stirred by the shock wave is the main challenge of hypersonic flight, and blunt body is always the principle configuration at hypersonic flow regime for heat distribution, but it would induce substantial drag. Therefore, both aerospikes and aerodisks can be efficiently utilized as a mean for drag reduction. In this work, we investigate the effect of different geometric shapes of aerospikes with various disk gap widths on drag reduction. Accordingly, a series of numerical simulation work was implemented to find the behaviour as to hypersonic flow over aerospiked blunt bodies. Moreover, the drag reduction efficiency of spiked blunt bodies would be optimized via the Kriging method. For the models we studied, we found that the drag on the spiked blunt bodies is much lower than the spike off one. The drag reduction efficiency especially would be predominated by the scale of recirculation zone, which increases as both the spike length and the gap size of aerodisk increase. Hence, the performance of drag diminution will depend on the design parameters such as main body configurations, aerospike length, and tip geometric shapes.

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Experimental investigation on spiked body in hypersonic flow

Cited by 86 publications

References 14 publications

Drag Reduction Using Aerodisks for Hypersonic Hemispherical Bodies

Drag Reduction Using Aerodisks for Hypersonic Hemispherical Bodies

Hypersonic Flow over Hemispherical Blunt Body with Spikes

Drag Reduction Optimization for Hypersonic Blunt Body with Aerospikes

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