Experimental and numerical investigation of an 8-cm valveless pulsejet

Geng, Tao; Zheng, Fangyan; Kiker, Adam Paul; Кузнецов, А. В.; Roberts, William L.

doi:10.1016/j.expthermflusci.2006.06.005

Cited by 17 publications

(14 citation statements)

References 10 publications

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“…23 It is generally agreed upon that this coupling is based on a Rayleigh criterion-type combustion process where there is in-phase pressure increase and heat addition. [24][25][26][27] While the exact mechanism of the combustion is not yet deciphered, several possibilities such as conventional turbulent flame ignition, 23 autoignition from the heated wall, 25 and shockless explosion combustion 26 have been proposed. Similarly, there is some contention on the nature of the acoustic oscillations happening inside pulsejets.…”

Section: Pulsejetmentioning

confidence: 99%

A review of pollutants emissions in various pressure gain combustors

Anand

Gutmark

2019

International Journal of Spray and Combustion Dynamics

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Recent years have witnessed a significant growth in the advancement and study of various unsteady combustors because of the prospective stagnation pressure gain offered by them. The pressure gain combustion produced by this class of combustors is poised to produce a step-change increase in the thermodynamic efficiency of gas-turbine engines. The current manuscript is oriented toward presenting a review on the pollutant emission characteristics of these devices; specifically, studies done so far on wave rotor combustors, pulsejet combustors, pulse detonation combustors, and rotating detonation combustors are evaluated. Because of the inherent fluid dynamic unsteadiness peculiar to pressure gain combustion devices, their emissions behavior is not well understood, and is notably different from the more conventional, steady combustors. The global view provided herein is expected to further the understanding of pressure gain combustion systems and ascertain the practicality of implementing them in real-world applications.Â Time in mode hr ð ÞOf the above terms, the time of operation cannot be altered since it is mission specific. This implies that

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Section: Pulsejetmentioning

confidence: 99%

A review of pollutants emissions in various pressure gain combustors

Anand

Gutmark

2019

International Journal of Spray and Combustion Dynamics

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“…Research efforts ultimately dwindled in the 1960s due to a number of unresolved problems and also due to the much-faster paced development of the gas turbine engine. In recent times, interest in pulsejets has been renewed due to their potential as microengines [8].…”

Section: Table Of Contentsmentioning

confidence: 99%

“…Later versions incorporated 6 'Escopette' engines (Fig. [1][2][3][4][5][6][7][8][9][10][11]. (Adapted from ref.…”

Section: Post-war Developments In Francementioning

confidence: 99%

Acoustic Analysis of Valveless Pulsejet Engines

Maqbool

Cadou

2017

Journal of Propulsion and Power

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Valveless pulsejets are extremely simple aircraft engines; essentially cleverly designed tubes with no moving parts. These engines utilize pressure waves, instead of machinery, for thrust generation, and have demonstrated thrust-to-weight ratios over 8 and thrust specific fuel consumption levels below 1 lbm/lbf-hr -performance levels that can rival many gas turbines. Despite their simplicity and competitive performance, they have not seen widespread application due to extremely high noise and vibration levels, which have persisted as an unresolved challenge primarily due to a lack of fundamental insight into the operation of these engines. This thesis develops two theories for pulsejet operation (both based on electro-acoustic analogies) that predict measurements better than any previous theory reported in the literature, and then uses them to devise and experimentally validate effective noise reduction strategies.

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“…However, the idea of pressure gain combustion (i.e., combustion with gain in total pressure across the combustor as opposed to pressure-loss combustion experienced in constant pressure devices like conventional gas turbine combustors) is gaining popularity for propulsion devices [2]. Thus pulse combustors, which provide a practical way of achieving pressure combustion, have a good potential for use in propulsion devices, especially, small-sized devices like micro-unmanned air vehicles (micro-UAVs) [3]. However, the performance of pulse combustors strongly depends on the combustor dynamics.…”

Section: Introductionmentioning

confidence: 99%

Non-linear dynamics in pulse combustor: A review

2015

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The state of the art of non-linear dynamics applied to pulse combustor theoretically and experimentally is reviewed. Pulse combustors are a class of air-breathing engines in which pulsations in combustion are utilized to improve the performance. As no analytical solution can be obtained for most of the nonlinear systems, the whole set of solutions can be investigated with the help of dynamical system theory. Many studies have been carried out on pulse combustors whose dynamics include limit cycle behaviour, Hopf bifurcation and period-doubling bifurcation. The dynamic signature has also been used for early prediction of extinction.

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Experimental and numerical investigation of an 8-cm valveless pulsejet

Cited by 17 publications

References 10 publications

A review of pollutants emissions in various pressure gain combustors

A review of pollutants emissions in various pressure gain combustors

Acoustic Analysis of Valveless Pulsejet Engines

Non-linear dynamics in pulse combustor: A review

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