Hysteresis phenomenon of the oblique detonation wave

Yu, Lihua; Wang, Lan; Xiao, Baoguo; Yan, Zhihui; Wang, Chao

doi:10.1016/j.combustflame.2018.02.010

Cited by 37 publications

(5 citation statements)

References 31 publications

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“…By increasing or decreasing the incident flow angle abruptly, the evolution of ODWs is simulated to study the hysteresis phenomena of an ODW (Liu et al. 2018). Our recent study demonstrates a complicated wave transition, such as the isolated local explosion and distorted reactive front, when wedge angle changes abruptly (Zhang et al.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of wedge-induced oblique detonations in unsteady flow

Yang

Teng

2019

J. Fluid Mech.

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Oblique detonation waves (ODWs) have been studied widely to facilitate their employment in hypersonic propulsion, but the effects of continuous unsteady inflow have never been addressed so far. Thus, the present study investigates wedge-induced oblique detonations in unsteady flow via numerical simulations based on the reactive Euler equations with a two-step induction–reaction kinetic model. As a first step, the chemical and flow parameters are chosen for the simplest structure such that the ODW initiation occurs under a smooth transition with a curved shock. After a steady ODW with smooth initiation transition is established, the inflow is then subject to a continuous sinusoidal density/temperature disturbance. Cases with single-pulse inflow variation are also simulated to clarify whether the observed phenomena are derived solely from the continuous disturbance. Two aspects are analysed to investigate the features of ODWs in unsteady flow, namely, the formation of triple points on the surface, and the movement of the reactive front position. On the formation of triple points, the continuous disturbance generates at most one pair of triple points, less than or equal to the number of triple points in single-pulse cases. This indicates that the effects of continuous disturbance weaken the ability to generate the triple points, although there appear more triple points convected downstream on the surface at any given instant. On the movement of the reactive front, oscillatory behaviours are induced in either single-pulse or continuous disturbance cases. However, more complicated dynamic displacements and noticeable effects of unsteadiness are observed in the cases of continuous disturbance, and are found to be sensitive to the disturbance wavenumber, $N$. Increasing $N$ results in three regimes with distinct behaviours, which are quasi-steady, overshooting oscillation and unstable ODW. For the quasi-steady case with low $N$, the reactive front oscillates coherently with the inflow disturbance with slightly higher amplitude around the initiation region. The overshooting oscillation generates the most significant variation of downstream surface in the case of modest $N$, reflecting a resonance-like behaviour of unsteady ODW. In the case of high $N$, the disturbed ODW surface readjusts itself with local unstable features. It becomes more robust and the reactive front of the final unstable ODW structure is less susceptible to flow disturbance.

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Section: Introductionmentioning

confidence: 99%

Numerical study of wedge-induced oblique detonations in unsteady flow

Yang

Teng

2019

J. Fluid Mech.

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“…In this study, the Adaptive Mesh Refinement Object-oriented C++ (AMROC) [27][28][29] based on the Structured Adaptive Mesh Refinement (SAMR) solver was used with a detailed reaction model, which has been efficiently used for various shock-induced combustion studies and detonation-based simulation problems [15,30,31]. In various numerical studies, AMROC has been successfully used for ODW simulations with a two-step mechanism [32][33][34], as well as detailed chemical kinetics [15]. In the current study, the simulations are performed by solving two-dimensional time-dependent compressible reactive multi-species Euler equations with detailed chemical kinetics for various incoming flows.…”

Section: Methodsmentioning

confidence: 99%

Oblique Detonation Wave Control with O3 and H2O2 Sensitization in Hypersonic Flow

Vashishtha

Panigrahy²,

Campi³

et al. 2022

Energies

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This numerical study investigates the effects of adding a small amount of ignition promoters for controlling the wedge-induced oblique shock wave (OSW) to oblique detonation wave (ODW) transition in a premixed hydrogen–air mixture at hypersonic speeds. The time-dependent two-dimensional compressible Euler equations for multiple thermally perfect species with a reactive source term are solved using adaptive mesh refinement and detailed chemical kinetics. The wedge with a fixed angle of 26∘ exhibits abrupt to smooth transitions for freestream Mach numbers 7–9 (speeds 2.8–3.2 km/s) at a pressure of 20 kPa and a temperature of 300 K. The small amount (1000 PPM by vol.) of H2O2 and O3 is found to be effective at significantly reducing the initiation length for the oblique detonation transition for all Mach numbers, which suggests a practical approach to increase the operating flight range for oblique detonation wave engine with a finite length wedge. At Mach number 8, the abrupt OSW to ODW transition turns towards a smooth transition with a small amount of H2O2 and O3 addition. Comparatively, O3 addition was found to be effective in reducing the ODW initiation length by promoting reactivity behind even a weaker oblique shock at low Mach number 7, for abrupt transition, while H2O2 addition was more effective than O3 at high Mach numbers 8 and 9, during a smooth transition. The maximum 73% and 80% reduction in initiation length of ODW was observed with 10,000 PPM H2O2 and O3 addition, respectively, during an abrupt OSW to ODW transition at Mach 7.

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“…Recent studies (Fang et al 2017;Iwata, Nakaya & Tsue 2017) have found that the inflow inhomogeneity may distort the initiation region, generating a 'V-shaped' flame and changing the surface positions. Meanwhile, abrupt variations of inflow angle have been simulated to study the effects of unsteady inflow (Liu et al 2018), revealing the hysteresis of ODW structures. More recently, simulation of an ODW in a generalized unsteady inflow (Yang, Ng & Teng 2019a) modelled as a continuous harmonic disturbance has uncovered interesting wave dynamics such as overshooting of oscillation amplitude and suppression of triple-point generation.…”

Section: Introductionmentioning

confidence: 99%