Experimental Study on DDT Characteristics in Spiral Configuration Pulse Detonation Engines

Wang, Wei; Qiu, Hua; Fan, Wei; Xiong, Cha

doi:10.1515/tjj-2013-0028

Cited by 11 publications

(13 citation statements)

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“…For the current SPDTs without obstacles, the DDT distance is longer than those of the straight tube with obstacles although the axial length of the spiral tube would be shorter. Some studies 24 have shown that DDT distance would also be shorter for the tube with a spiral shape than the same tube with a straight shape. Therefore the SPDT with obstacles would have potential advantages for PDE application, which need to be investigated.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the concepts of spiral pulse detonation tubes (SPDT) were proposed. [12][13][14][15][16] Although the L DDT of the SPDT still exists and may be comparable to that of a straight detonation tube, the axial length of the detonation chamber is greatly reduced due to its helical or curved configuration. However, there is currently very little research on the DDT process in curved tubes.…”

Section: Introductionmentioning

confidence: 99%

“…Other related work was carried out in a single-shot firing mode. By deforming the same metal hose, Wang et al 24 compared the DDT characteristics of the eight spiral detonation tubes and the straight detonation tube with pressure measurement data. Gasoline and air are used as fuel and oxidant.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation on multi-cycle two-phase spiral pulse detonation tube of two configurations

Qiu

Zheng²,

Xiong

2018

Proceedings of the Institution of Mechanical Engineers, Part G:

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The spiral tube structure is an effective method to shorten the axial length of the pulse detonation chamber. In this article, spiral pulsed detonation tube with two kinds of spiral configuration was experimentally investigated. Liquid gasoline and air were used as fuel and oxidant, respectively, and equivalence ratios were controlled to about 1.0. Based on the transient pressure along the tube, the propagation characteristics of the pressure waves in the multi-cycle spiral pulsed detonation tubes, such as pressure peaks, wave velocities and propagation process, were analyzed. Results showed that propagation of double compression waves was the common feature during the process of deflagration to detonation transition in the presented spiral tubes, and the onset of detonation was initiated by a local explosion in the second compression wave. The deflagration to detonation transition characteristics with detonation initiation and combustion characteristics without initiation in the spiral sections were both related to the dimensionless distance. Propagation characteristics of the pressure waves were influenced by the use of different spiral configuration. And some interesting phenomena were also found.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental investigation on multi-cycle two-phase spiral pulse detonation tube of two configurations

Qiu

Zheng²,

Xiong

2018

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…In these studies shorter length configurations and highest blockage ratio were successful and sustained DDT was achieved. Wang et al [22] performed the numbers of experiments on spiral configuration in pulse detonation engine. Their analysis provided the design data for deflagration to detonation transition rule in curved detonation chamber.…”

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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“…Over the last few decades, even well-designed laboratoryscale experimental and numerical studies were concentrated on the most common approach for detonation onset, deflagration to detonation transition (DDT), [1][2][3][4][5][6][7][8][9][10][11] testing a wide range of initial and boundary conditions (with spiral or other obstacles, etc. [1][2][3][4][5][6][7][8][9][10][11] ).…”

Section: Introductionmentioning

confidence: 99%

Critical deflagration waves leading to detonation onset under different boundary conditions

Lin¹,

Zhang²,

Fan³

et al. 2015

Chinese Phys. B

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High-speed turbulent critical deflagration waves before detonation onset in H 2 -air mixture propagated into a square cross section channel, which was assembled of optional rigid rough, rigid smooth, or flexible walls. The corresponding propagation characteristic and the influence of the wall boundaries on the propagation were investigated via high-speed shadowgraph and a high-frequency pressure sampling system. As a comprehensive supplement to the different walls effect investigation, the effect of porous absorbing walls on the detonation propagation was also investigated via smoke foils and the high-frequency pressure sampling system. Results are as follows. In the critical deflagration stage, the leading shock and the closely following turbulent flame front travel at a speed of nearly half the CJ detonation velocity. In the preheated zone, a zonary flame arises from the overlapping part of the boundary layer and the pressure waves, and then merges into the mainstream flame. Among these wall boundary conditions, the rigid rough wall plays a most positive role in the formation of the zonary flame and thus accelerates the transition of the deflagration to detonation (DDT), which is due to the boost of the boundary layer growth and the pressure wave reflection. Even though the flexible wall is not conducive to the pressure wave reflection, it brings out a faster boundary layer growth, which plays a more significant role in the zonary flame formation. Additionally, the porous absorbing wall absorbs the transverse wave and yields detonation decay and velocity deficit. After the absorbing wall, below some low initial pressure conditions, no re-initiation occurs and the deflagration propagates in critical deflagration for a relatively long distance.

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Experimental Study on DDT Characteristics in Spiral Configuration Pulse Detonation Engines

Cited by 11 publications

References 0 publications

Experimental investigation on multi-cycle two-phase spiral pulse detonation tube of two configurations

Experimental investigation on multi-cycle two-phase spiral pulse detonation tube of two configurations

Review on Recent Advances in Pulse Detonation Engines

Critical deflagration waves leading to detonation onset under different boundary conditions

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