Detonation regimes of gases in capillaries

Manzhalei, V. I.

doi:10.1007/bf00749647

Cited by 23 publications

(7 citation statements)

References 7 publications

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“…1.8 mm) tube, the boundary layer is probably playing an influential role in stabilizing the wave. A theoretical model for this boundary layer stabilized quasi-detonation was given by Manzhalei [12] who studied detonation propagation in capillary tubes. Thus, boundary layer stabilized detonations should not be considered as normal detonations and the limit criterion for larger diameter tube may not be relevant to the 1.8 mm tube.…”

Section: Conditions Outside the Limitsmentioning

confidence: 99%

“…Dupré's results indicate that both velocity deficit and instability characterize the detonation limits. Manzhalei [12] studied the limits of galloping detonations in capillary tubes in an acetylene-oxygen mixture and demonstrated the existence of boundary layer stabilized steady waves at velocities as low as half the normal CJ value. Thus the low velocity phase of the galloping cycle can be ascribed to the effect of boundary layer.…”

Section: Introductionmentioning

confidence: 99%

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Propagation of near-limit gaseous detonations in small diameter tubes

Camargo

Chao

et al. 2010

Shock Waves

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In this study, detonation limits in very small diameter tubes are investigated to further the understanding of the near-limit detonation phenomenon. Three small diameter circular tubes of 1.8 mm, 6.3 mm, and 9.5 mm inner diameters, of 3m length, were used to permit the near-limit detonations to be observed over long distances of 300 to 1500 tube diameters. Mixtures with high argon dilution (stable) and without dilution (unstable) are used for the experiments. For stable mixtures highly diluted with argon for which instabilities are not important and where failure is due to losses only, the limit obtained experimentally is in good agreement in comparison to that computed by the quasi-steady ZND theory with flow divergence or curvature term modeling the boundary layer effects. For unstable detonations suppression of the instabilities of the cellular detonation due to boundary conditions is responsible for the failure of the detonation wave. Different near-limit propagation regimes are also observed, including the spinning and galloping mode. Based on the present experimental results, an attempt is made to study an operational criterion for the propagation limits of stable and unstable detonations.

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Section: Conditions Outside the Limitsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Propagation of near-limit gaseous detonations in small diameter tubes

Camargo

Chao

et al. 2010

Shock Waves

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show abstract

“…Manzhalei [17][18][19] studied the near-limiting propagation of detonation waves under reduced pressures in capillary tubes with inner diameters at around 1 mm using acetylene/oxygen mixtures. Detonation waves in the experiments were initiated in a larger tube before propagated into the capillary.…”

Section: Introductionmentioning

confidence: 99%

Reaction propagation modes in millimeter-scale tubes for ethylene/oxygen mixtures

Wang

2011

Proceedings of the Combustion Institute

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“…The galloping DW is a self-oscillatory process intermediate between the low-velocity and multifront detonation regimes, outside the ranges of their existence. The lowvelocity detonation can exist, for instance, in tubes with comparatively large obstacles or in narrow smooth tubes such as glass capillaries [106,107]. The formation of the wave structure of a low-velocity detonation is caused by transport processes near the flame surface rather than by accumulation of active spots in the induction zone behind the SW.…”

Section: Critical Size Of Experimental Equipment For Detonation LImentioning

confidence: 99%

Cell Size as the Main Geometric Parameter of a Multifront Detonation Wave

Васильев

2006

Journal of Propulsion and Power

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The concept of the cell size of multifront gaseous detonation proposed about 40 years ago is used widely to estimate other detonation parameters: the critical initiation energy and critical diameters. In this paper the review of all known models for calculation of the cell size as the main detonation parameter is presented. Models were analyzed on their physical basis and basic assumptions. All models were checked also on their correctness to estimate the cell size for different mixtures. The calculated values of cell size were compared with available experimental data. On the basis of such comparison only some models are recommended for engineering calculations in practical applications. The formulas for estimating important detonation parameters with the dimension of length are proposed. Nomenclature A = preexponential factor, sec mol=cm 3 a, b = transverse and longitudinal cell sizes, respectively c 1 , P 1 = sound velocity and pressure in the induction zone D 0 = Chapman-Jouguet detonation wave velocity (chemical equilibrium calculation) D 2 , D ? = velocities of shock wave and transverse wave at collision E = effective activation energy, kcal=mol E 0 = collision energy [f], [o], [in] = concentrations of fuel, oxidant, and inert; mol cm 3 M = Mach number (M D 0 =c 0 , M 2 D 2 =c 0 , M ? D ? =c 0 ) P 0 , c 0= initial pressure and sound speed Q = specific chemical heat release R; r = shock front radii from two neighboring microexplosions at a certain time instant (R 0 r 0 at collision moment) r = coordinate of shock front r 2 , t 2 = shock wave radius and instant of transverse wave collision r , t = shock wave radius and instant when the latest particle crosses the shock front, for the latest particle the ignition delay is over at instant of transverse wave collision T = temperature t = time u = particle velocity in the laboratory frame of reference x = r =b y = =2b = parameter of the model of a strong point explosion = parameter of the model of a detonation wave with instantaneous chemical reaction behind the shock front = adiabatic exponent of initial mixture e = equilibrium adiabatic exponent of detonation products " = E 0 =4 0 D 2 0 b 2 p = transverse wave size at collision moment ij = P i =P j 0 = initial mixture density = = 0 = ignition delay

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Detonation regimes of gases in capillaries

Cited by 23 publications

References 7 publications

Propagation of near-limit gaseous detonations in small diameter tubes

Propagation of near-limit gaseous detonations in small diameter tubes

Reaction propagation modes in millimeter-scale tubes for ethylene/oxygen mixtures

Cell Size as the Main Geometric Parameter of a Multifront Detonation Wave

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