Supersonic mixing in airbreathing propulsion systems for hypersonic flights

Huang, Wei; Du, Zhao-bo; Yan, Li; Xia, Zhixun

doi:10.1016/j.paerosci.2019.05.005

Cited by 175 publications

(16 citation statements)

References 166 publications

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“…In general, engineers are inclined to employ four different ways to predict the aerodynamic force and heating loads of the hypersonic airliners, including flight test [ 10 ], empirical estimation methods [ 11 ], wind tunnel experiments [ 12 , 13 ], and Computational Fluid Dynamics (CFD) method [ 14 – 17 ]. Among these technologies, the empirical estimation method can not be applied to complex flows.…”

Section: Introductionmentioning

confidence: 99%

A Review of Riemann Solvers for Hypersonic Flows

Sun

Liu

et al. 2021

Arch Computat Methods Eng

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In the design of the hypersonic airliner which can greatly shorten the flight time and conduct space travel, it is of great significance for a Riemann solver to accurately simulate hypersonic flows. In this survey, the research process on the Riemann solver for hypersonic flows is reviewed, including the constructions of the traditional Riemann solvers, improvements of the traditional Riemann solvers for the shock anomaly, and the importance of the all-speed Riemann solver for hypersonic flows. Moreover, constructions and applications of the all-speed Riemann solvers are presented. It is obvious that the Riemann solver should be capable of obtaining physical solutions at low speeds and be robust against shock anomaly near strong shocks at the same time in simulating hypersonic flows.

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Section: Introductionmentioning

confidence: 99%

A Review of Riemann Solvers for Hypersonic Flows

Sun

Liu

et al. 2021

Arch Computat Methods Eng

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“…Since there are several factors for the evaluation of the model, extensive researches are required for the investigation of different aspects of fuel injection systems. [29][30][31] The main methodology of the current researches in this topic is both computational and experimental. Due to the high cost of empirical examinations, it is not feasible to apply this approach for the evaluation of different injection systems.…”

Section: Introductionmentioning

confidence: 99%

“…The evaluation of thermal factor, pressure recovery, and recirculation parameters are done to reveal the main characteristics of these techniques. Since there are several factors for the evaluation of the model, extensive researches are required for the investigation of different aspects of fuel injection systems 29‐31 …”

Section: Introductionmentioning

confidence: 99%

Computational investigation of multi hydrogen jets at inclined supersonic flow

2020

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Summary Scramjet design is directly associated with the fuel mixing inside the combustor. In this study, the influences of the free stream angle on the fuel mixing zone of eight microjets are fully investigated. This study mainly tries to disclose the importance of the fuel jet interaction with a supersonic free stream on penetration and distribution of hydrogen jets. The effects of jet paces and different free stream angles are fully examined in this work. For the computational study, CFD numerical method is applied to obtain the fuel jet structure at supersonic cross‐flow. RANS equations with SST turbulence scheme is employed for the simulation of our model. Our simulations show that a positive angle of supersonic incoming flow is effective for the uniform expansion of the fuel mixing zone inside the combustor. According to our findings, increasing the angles of the free stream declines the mixing zone when the fuel jet interaction of the last jets with main stream decreases. Our results indicate that mixing efficiency of ‐20° is about 30% more than other angles.

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“…Scramjet is one of the most popular engine technologies that achieve hypersonic flight, and its further development requires optimization of the overall performance. The mixing process, which is substantially affected by the geometric configurations and injection strategy, is a key factor in determining the combustion process [1][2][3]. Therefore, additional structures are introduced to enhance the mixing of the normal jets on the flat wall, and the backward-facing step (BFS) is one of the common structures in engineering.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Backward Facing Step on a Transverse Jet in Supersonic Crossflow

Zhang¹,

Wang²,

Sun³

et al. 2020

Energies

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A transverse jet in the supersonic crossflow is one of the most promising injection schemes in scramjet, where the control or enhancement of jet mixing is a critical issue. In this paper, the effect of the backward facing step on the characteristics of jet mixing was investigated by three-dimensional large eddy simulation (LES). The simulation in the flat plate configuration (step height of 0) was performed as the baseline case to verify the computation framework. The distribution of the velocity and pressure obtained by the LES agreed well with the experiment, which shows the reliability of the LES code. Then, two steps with a height of 1.0D and 1.58D (D is the injector diameter) were numerically compared to the non-step baseline case. The comparison of the three cases illustrates the effect of the large-scale recirculation region on the variable distribution, and shock and vortex structures in the flow field. In the windward region, the shear layers become thicker, and the convection velocity of the shear vortexes reduces. In the leeward region, the wake vortices almost disappear while the counterrotating vortex pairs (CVPs) expand in the spanwise direction. In the area upstream of the jet, the separation bubble works with the upstream large-scale recirculation zone to entrain the jet into the upstream near-wall zone. At last, a comparison of the overall mixing performance of the three cases revealed that the penetration depth and mixing efficiency increased with the step height increasing.

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Supersonic mixing in airbreathing propulsion systems for hypersonic flights

Cited by 175 publications

References 166 publications

A Review of Riemann Solvers for Hypersonic Flows

A Review of Riemann Solvers for Hypersonic Flows

Computational investigation of multi hydrogen jets at inclined supersonic flow

Effect of the Backward Facing Step on a Transverse Jet in Supersonic Crossflow

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