Reduction of wave drag on parameterized blunt bodies using spikes with varied tip geometries

Mohandas, Suhaas; Siddharth, R. Krishna; John, Bibin

doi:10.1016/j.actaastro.2019.04.017

Cited by 12 publications

(5 citation statements)

References 14 publications

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“…Even without using an aerodisk, modifying the tip of a plain spike was proved to have a strong impact on its performance [64] and can reduce flow instability [65,66]. It is also confirmed that the forebody configuration impacts the device effectiveness [33,55,67,68]. In the context of a design optimization study [69], spike length is found to be responsible for about 50%, 20%, and 30% of drag, aeroheating, and flow stability, respectively.…”

Section: Factors Controlling the Mechanical Spike Effectiveness And Fmentioning

confidence: 93%

Forebody shock control devices for drag and aero-heating reduction: A comprehensive survey with a practical perspective

Ahmed

Qin

2020

Progress in Aerospace Sciences

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One key feature that distinguishes the flowfield around vehicles flying in supersonic and hypersonic regimes is the bow shock wave ahead of forebody. The severe drag and aeroheating impacting these vehicles can be significantly reduced if the bow shock wave ahead of the vehicles forebodies is controlled to yield weaker system of oblique shocks. Benefits of forebody shock control include increasing flight ranges, economizing fuel consumption, reducing dead weights, and thermally protecting forebody structure and onboard equipment. Forebody shock control that has been widely studied since the early 1900s is achievable in numerous techniques that vary according to the mechanism of control. While some of these techniques have already been implemented in real systems, other techniques involve serious complications and tough trade-offs. The present paper is intended to serve as the first comprehensive survey on the field of forebody shock control devices. The objectives of the present paper are multifold. The paper categorizes the various forebody shock control devices in a physics-based manner, explains the underlying physics for each device, and surveys the key studies and state-of-the-art knowledge. The paper also addresses the existing gaps in knowledge, highlights the existing systems implementing these devices, and discusses the associated practical implementation issues and design-tradeoffs. 2. Structural devices, the mechanical spikes: 2.1. Principle of operation of mechanical spikes Drag and Aeroheating Reduction Devices Fluidic Devices Opposing jets Structural Devices Mechanical spikes Energetic Devices Energy deposition Basic devices Structural-Fluidic Devices Structural-Energetic Devices Hybrid devices

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Section: Factors Controlling the Mechanical Spike Effectiveness And Fmentioning

confidence: 93%

Forebody shock control devices for drag and aero-heating reduction: A comprehensive survey with a practical perspective

Ahmed

Qin

2020

Progress in Aerospace Sciences

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“…These factors in turn influence the total drag and surface heat flux of the blunt-body and spike arrangement. The blunt body simulations researched by Mohandas et al [13] was recreated in our study as well and the results are as shown in Figure 4a. The drag values from this initial study is tabulated in Table 2a.…”

Section: Analysis Of Blunt Bodies With Aero Disk Spikementioning

confidence: 96%

“…The base blunt-body configurations are taken from Brooks and Trescot [14]. Three such models have been already identified by Mohandas et al [13] based on their drag efficiency. The blunt body specification from Brooks and Trescot [14] varied based on their nose bluntness factor,(K), fineness ratio (λ), half cone angle (θ), and base shape.…”

Section: Geometrymentioning

confidence: 99%

“…[12] and Mohandas et.al. [13] The inflow and outflow conditions have also been obtained from the same literature. The far-field inflow velocity and the static pressure imposed are 626.09m/s (Mach 2) and 40800Pa.…”

Section: Computational Setupmentioning

confidence: 99%

“…The research related to parametric effect of spike length and different spike geometries at different speeds was conducted by many scholars in the past [10,11]. Hemispherical blunt bodies were extensively researched at hypersonic speeds but Sahoo et al and Mohandas et al [12,13] were an exception wherein the flow was at supersonic (Mach = 2) speeds. Sahoo et al experimentally studied three spike designs at Mach 2.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Investigation of Supersonic Flow over Aero-Disk Spiked Ballistic Bodies

Sundarraj¹,

Porwal²,

Raj³

et al. 2020

Australasian Fluid Mechanics Conference (AFMC)

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Computational Fluid Dynamics (CFD) analysis has been carried out on ballistic bodies with a hemispherical aero-disk spike. This research involves the presence and absence of a blunt tip to understand the flow behavior on these bodies under two scenarios namely zero-degree angle of attack and at supersonic speed (Mach 2.0). The aerodynamic drag and thermal heat transfer effects of these spikes on three different blunt-body configurations have been studied. The flow patterns on these configurations were threedimensionally visualized through Schlieren images. It was observed that the usage of an aero-disk spike reduced the aerodynamic drag by 50%-60%. Additionally, peak surface heat flux reduced significantly. Similar drag reduction trends were noticed with the usage of the blunt tip version as well, but with further reduction in peak surface heat flux. In conclusion, the usage of blunt tip aero-disk spike on the configuration labeled 3221 has significantly improved the drag and surface heat flux effects.

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Mechanical techniques (spike)

Gerdroodbary¹

2023

Aerodynamic Heating in Supersonic and Hypersonic Flows

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Reduction of wave drag on parameterized blunt bodies using spikes with varied tip geometries

Cited by 12 publications

References 14 publications

Forebody shock control devices for drag and aero-heating reduction: A comprehensive survey with a practical perspective

Forebody shock control devices for drag and aero-heating reduction: A comprehensive survey with a practical perspective

Numerical Investigation of Supersonic Flow over Aero-Disk Spiked Ballistic Bodies

Mechanical techniques (spike)

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