Numerical and Experimental Investigation of Detonation Initiation in Profiled Tubes

Semenov, I. V.; Utkin, P. S.; Марков, В. В.; Фролов, С. М.; Aksenov, V. S.

doi:10.1080/00102202.2010.497404

Cited by 6 publications

(2 citation statements)

References 11 publications

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“…The simulation results demonstrated a considerable effect of U-bend tube on detonation initiation. Semenov et al [46] proposed the parabolic contraction and conical expansion for detonation initiation in a tube. The shine shaped wall is proposed for optimized geometry of conical expansion.…”

Section: Reviews On Experimental Analysismentioning

confidence: 99%

Review on Recent Advances in Pulse Detonation Engines

Pandey

Debnath

2016

Journal of Combustion

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Pulse detonation engines (PDEs) are new exciting propulsion technologies for future propulsion applications. The operating cycles of PDE consist of fuel-air mixture, combustion, blowdown, and purging. The combustion process in pulse detonation engine is the most important phenomenon as it produces reliable and repeatable detonation waves. The detonation wave initiation in detonation tube in practical system is a combination of multistage combustion phenomena. Detonation combustion causes rapid burning of fuel-air mixture, which is a thousand times faster than deflagration mode of combustion process. PDE utilizes repetitive detonation wave to produce propulsion thrust. In the present paper, detailed review of various experimental studies and computational analysis addressing the detonation mode of combustion in pulse detonation engines are discussed. The effect of different parameters on the improvement of propulsion performance of pulse detonation engine has been presented in detail in this research paper. It is observed that the design of detonation wave flow path in detonation tube, ejectors at exit section of detonation tube, and operating parameters such as Mach numbers are mainly responsible for improving the propulsion performance of PDE. In the present review work, further scope of research in this area has also been suggested.

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Section: Reviews On Experimental Analysismentioning

confidence: 99%

Review on Recent Advances in Pulse Detonation Engines

Pandey

Debnath

2016

Journal of Combustion

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“…16 The shock wave in these investigations was generated via a bursting diaphragm. Semenov et al 17 showed that sinusoidal conic expansion can lead to detonation initiation close to wall for failure of SDT inside the nozzle. When a suitably reactive gaseous mixture (e.g.…”

Section: Introductionmentioning

confidence: 99%

Detonation initiation by shock focusing at elevated pressure conditions in a pulse detonation combustor

Habicht

Yücel

Gray

et al. 2020

International Journal of Spray and Combustion Dynamics

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This work contains experimental investigations on the correlation of the detonation initiation process via a shock-focusing device with various initial pressures and mass flow rates. A pulse detonation combustor is operated with stoichiometric hydrogen--air--oxygen mixtures in single cycle operation. A rotationally symmetric shock-focusing geometry evokes the onset of a detonation by the focusing of the reflected leading shock wave, while a blockage plate at the rear end of the test rig is applied to induce an elevated initial pressure. The results show that the reactivity has a major influence on the success rate of detonation initiation. However, measurements with different blockage plates suggest that the mass flow rate has to be considered as well when predicting the success rate. Three main statements can be drawn from the results. (1) An increase in the mean flow velocity induces higher velocity fluctuations which result in a stronger leading shock ahead of the accelerating deflagration front. (2) An increase in the initial static pressure reduces the critical shock strength that must be exceeded to ensure successful detonation initiation by shock focusing. (3) Since the initial pressure is directly linked to the mass flow rate, these contrary trends can cancel each other out, which could be observed for 40% vol. of oxygen in the oxidizer. High-speed images were taken, which confirm that the detonation is initiated in the center of the converging--diverging nozzle due to focusing of the leading shock.

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Adjoint-based optimisation of detonation initiation by a focusing shock wave

et al. 2021

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An optimisation study of a shock-wave-focusing geometry is presented in this work. The configuration serves as a reliable and deterministic detonation initiator in a pulsed detonation engine. The combustion chamber consists of a circular pipe with one convergent–divergent axisymmetric nozzle, acting as a focusing device for an incoming shock wave. Geometrical changes are proposed to reduce the minimum shock wave strength necessary for a successful detonation initiation. For that purpose, the adjoint approach is applied. The sensitivity of the initiation to flow variations delivered by this method is used to reshape the obstacle’s form. The thermodynamics is described by a higher-order temperature-dependent polynomial, avoiding the large errors of the constant adiabatic exponent assumption. The chemical reaction of stoichiometric premixed hydrogen-air is modelled by means of a one-step kinetics with a variable pre-exponential factor. This factor is adapted to reproduce the induction time of a complex kinetics model. The optimisation results in a 5% decrease of the incident shock wave threshold for the successful detonation initiation.

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Numerical and Experimental Investigation of Detonation Initiation in Profiled Tubes

Cited by 6 publications

References 11 publications

Review on Recent Advances in Pulse Detonation Engines

Review on Recent Advances in Pulse Detonation Engines

Detonation initiation by shock focusing at elevated pressure conditions in a pulse detonation combustor

Adjoint-based optimisation of detonation initiation by a focusing shock wave

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