Coupled investigation on drag reduction and thermal protection mechanism induced by a novel combinational spike and multi-jet strategy in hypersonic flows

Zhu, Liang; Li, Yingkun; Gong, Lunkun; Chen, Xiong; Xu, Jie

doi:10.1016/j.ijheatmasstransfer.2018.11.119

Cited by 50 publications

(5 citation statements)

References 57 publications

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“…As shown in Figure 5, it is assumed that the surface of the absorption layer is flat and smooth, according to Maxwell's equation and matter equation [17]. Propagation vector K and electric vector E have an admittance formula as follows:…”

Section: Calculation Methods Of Ink Absorption Layer Structurementioning

confidence: 99%

The Silver Ion and Nanocrystalline Pattern in the Glass Substrate, the Electric Field-Induced Thermal Transfer and Ink Absorption Layer Structure and Printing Performance

Dong

2022

Advances in Materials Science and Engineering

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People’s research on nanocrystals is getting more in-depth with the development of science and technology, and the patterned arrangement of nanocrystals can greatly improve the performance of our equipment in related fields, allowing people to control the patterning of nanocrystals. Research on thermal transfer is also increasing. Glass materials doped with patterned metal nanocrystals have great application potential, and the search for a simple and efficient patterned preparation method has attracted great attention of many researchers. Using the directional induced migration effect of the high temperature and high voltage DC electric field, combined with the subsequent heat treatment process, the distribution of silver nanocrystals corresponding to the surface silver film pattern can be formed in the silicate glass substrate, to realize the electric field-induced thermal transfer of the nanocrystal pattern print. This article aims to study the patterned thermal transfer of silver ions and nanocrystals on the glass substrate by applying an electric field to induce and analyze the ink absorption layer structure and printing performance. On this basis, an electron beam-induced thermal transfer method and Maxwell’s equation are proposed to investigate and calculate the structure of the ink absorption layer. The experimental structure shows that using this method increases the success rate of the preparation of silver ions and nanocrystal patterns on the glass substrate by 30%, which improves the ink absorption layer and printing performance to different degrees.

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Section: Calculation Methods Of Ink Absorption Layer Structurementioning

confidence: 99%

The Silver Ion and Nanocrystalline Pattern in the Glass Substrate, the Electric Field-Induced Thermal Transfer and Ink Absorption Layer Structure and Printing Performance

Dong

2022

Advances in Materials Science and Engineering

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“…By this augmentation, a jet can compensate short spikes while a spike can compensate low pressure jets [309]. Nonetheless, the benefits of the hybrid device diminish for longer spikes, higher jet pressures, and flow rate [307,321,328]. As for practical implementation of this hybrid device, the same concerns of the conventional opposing jet can be raised namely, space and power demands and source of jet.…”

Section: Comments On Structural-fluidic Devicesmentioning

confidence: 99%

“…This is because a lateral jet is directed towards zones with much lower pressure. Hence, for a given effect, lateral jets require much lower pressure and mass flow rates than tip jets with no thrust penalty [328]. It was even suggested that evaporating water (used as a spike coolant) can be adequate as a source for lateral jet [306].…”

Section: Comments On Structural-fluidic Devicesmentioning

confidence: 99%

“…In addition, concerns can be raised regarding the credibility of some reported conclusions in the numerical simulation studies so far. Due to the lack of experimental database, some simulation studies used experiments on isolated spikes, conventional opposing jets, or even plain blunt forebodies [314][315][316][317]328] to validate simulation techniques. Other simulation studies did not include any validation with experiments at all [313,314,323,324,329].…”

Section: Comments On Structural-fluidic Devicesmentioning

confidence: 99%

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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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“…Qin and Xu (26) introduced a cooling jet on the aerodome and double-aerodome concepts, and over 45% heat flux reduction was obtained by introducing a cooling jet on the double-aerodome concept. The conjugate heat transfer approach was employed by Zhu et al (27) to study the drag and heat reduction induced by the combinational lateral jet and spike concept, and they further investigated the drag reduction and thermal protection mechanism induced by a novel combinational spike and multi-jet strategy (28) . Gerdroodbary et al (29,30) studied the heat flux reduction induced by an opposing jet issuing from the root of the spike in detail.…”

Section: Introductionmentioning

confidence: 99%

Influences of lateral jet location and its number on the drag reduction of a blunted body in supersonic flows

Liao

et al. 2020

Aeronaut. j.

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The analysis of the aerodynamic environment of the re-entry vehicle attaches great importance to the design of the novel drag reduction strategies, and the combinational spike and jet concept has shown promising application for the drag reduction in supersonic flows. In this paper, the drag force reduction mechanism induced by the combinational spike and lateral jet concept with the freestream Mach number being 5.9332 has been investigated numerically by means of the two-dimensional axisymmetric Navier-Stokes equations coupled with the shear stress transport (SST) k-ω turbulence model, and the effects of the lateral jet location and its number on the drag reduction of the blunt body have been evaluated. The obtained results show that the drag force of the blunt body can be reduced more profoundly when employing the dual lateral jets, and its maximum percentage is 38.81%, with the locations of the first and second lateral jets arranged suitably. The interaction between the leading shock wave and the first lateral jet has a great impact on the drag force reduction. The drag force reduction is more evident when the interaction is stronger. Due to the inclusion of the lateral jet, the pressure intensity at the reattachment point of the blunt body decreases sharply, as well as the temperature near the walls of the spike and the blunt body, and this implies that the multi-lateral jet is beneficial for the drag reduction.

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Coupled investigation on drag reduction and thermal protection mechanism induced by a novel combinational spike and multi-jet strategy in hypersonic flows

Cited by 50 publications

References 57 publications

The Silver Ion and Nanocrystalline Pattern in the Glass Substrate, the Electric Field-Induced Thermal Transfer and Ink Absorption Layer Structure and Printing Performance

The Silver Ion and Nanocrystalline Pattern in the Glass Substrate, the Electric Field-Induced Thermal Transfer and Ink Absorption Layer Structure and Printing Performance

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

Influences of lateral jet location and its number on the drag reduction of a blunted body in supersonic flows

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