Investigating an annular nozzle on combustion products of hydrocarbon fuels

Левин, В. А.; Afonina, N. E.; Gromov, V. G.; Smekhov, G. D.; Khmelevsky, A. N.; Марков, В. В.

doi:10.1134/s0869864313030013

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…The resonator adopts a partial spherical configuration. Compared with the 70 mm diameter resonator in the literature [ 11 , 12 ], the diameter of the resonator selected in this paper is 90 mm and the depth is 23.6 mm, in order to provide a larger thrust wall area.…”

Section: Experimental Facility and Methodologymentioning

confidence: 99%

“…Compared with the traditional pulse detonation engine, the working frequency of this engine theoretically will not be limited by the ignitor and valve frequency, the structure is more compact, and it is not easy to be effected by the external environment [ 9 ]. For this type of shock wave focusing detonation combustor, Levin et al [ 10 , 11 , 12 ] also carried out a large number of experiments and numerical simulations on blow-down shock wave focusing combustion using the acetylene-air mixture as fuel. The flow field characteristics, thrust, and specific impulse characteristics inside the engine cavity, and the spectrum characteristics of shock wave focusing combustion under different structures were studied thoroughly.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Diagnosis on Combustion Characteristic of Shock Wave Focusing Initiation Engine

Song

Chen

et al. 2022

Entropy

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A shock wave focusing initiation engine was assembled and tested in an experimental program. The effective pyrolysis rate of the pre-combustor was evaluated over a range of supplementary fuel ratio in this paper. Results highlight two operational modes of the resonant cavity: (1) pulsating combustion mode, (2) stable combustion mode. The appearance of the two combustion modes is jointly affected by the flow and the structural characteristic value of the combustion chamber. This paper uses images, time-frequency analysis, and nonlinear time series analysis methods to identify and distinguish these two combustion modes. It is believed that the interaction between the combustion chamber and the supply plenum is the probable reason for different combustion modes. The experiment has found that structural parameters and import flow parameters have an impact on the initiation of the combustion chamber. Increasing the injection pressure can appropriately broaden the fuel-rich boundary of initiation. Low equivalence ratio and high injection pressure can also appropriately increase the combustion working frequency in a small range. From the perspective of pressure utilization, under the premise of ensuring successful initiation, injection pressure should not be too high.

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Section: Experimental Facility and Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Diagnosis on Combustion Characteristic of Shock Wave Focusing Initiation Engine

Song

Chen

et al. 2022

Entropy

View full text Add to dashboard Cite

show abstract

“…The use of high-performance computers made it possible to study multi-dimensional flows related to the detonation due to the energy of the combustible mixture motion and its interaction with moving boundaries (see [36][37][38][39][40][41][42][43][44][45][46]). New regimes of the propagation of chemical reaction waves, including the galloping layered detonation, were discovered.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of spinning detonation in circular section channels

Левин

Manuylovich

Марков

2016

Comput. Math. and Math. Phys.

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Numerical simulation of three-dimensional structures of gas detonation in circular section channels that emerge due to the instability when the one-dimensional flow is initiated by energy supply at the closed end of the channel is performed. It is found that in channels with a large diameter, an irregular three-dimensional cellular detonation structure is formed. Furthermore, it is found that in channels with a small diameter circular section, the initially plane detonation wave is spontaneously transformed into a spinning detonation wave, while passing through four phases. A critical value of the channel diameter that divides the regimes with the three-dimensional cellular detonation and spinning detonation is determined. The stability of the spinning detonation wave under perturbations occurring when the wave passes into a channel with a greater (a smaller) diameter is investigated. It is found that the spin is preserved if the diameter of the next channel (into which the wave passes) is smaller (respectively, greater) than a certain critical value. The computations were performed on the Lomonosov supercomputer using from 0.1 to 10 billions of computational cells. All the computations of the cellular and spinning detonation were performed in the whole long three-dimensional channel (up to 1 m long) rather than only in its part containing the detonation wave; this made it possible to adequately simulate and investigate the features of the transformation of the detonation structure in the process of its propagation. INTRODUCTIONThe study of detonation waves in gases is mainly stimulated by the desire to use them for practical purposes in impulse facilities and special energy systems designed for rockets and other flying vehicles. Large magnitudes of the gas dynamics parameters and the complex flow pattern behind the detonation wave front significantly complicate both the experimental and theoretical study of detonation. The main source of information about detonation waves is the experimental study. Among the experimenters, a special place is held by Soloukhin (see [1][2][3][4][5][6]). His works became handbooks for generations of researchers. A significant contribution to the study of detonation was made by his colleagues, disciples, and students. As experimental data were accumulated, theoretical detonation models were improved as well. For example, the two-stage model, which takes into account the ignition delay and a finite time of the subsequent heat emission, makes it possible to describe the nonstationary nonlinear wave structure of detonation (see [7]). In the framework of the infinitely thin detonation wave, the asymptotic nature of the transition of the plane wave to the Chapman-Jouguet regime was established; in the framework of the cylindrical and spherical model, it was found that this transition occurs at a finite distance from the point of the detonation wave formation (see [8,9]). Within the two-stage model, the initial phase of the flow initiated by a point explosion was analytically investigated...

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Influence of flow parameters on single shock-wave-focusing detonation and initial verification

Zhang

Chen

et al. 2021

AIP Advances

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As an advanced method for initiating detonation, shock-wave focusing (SWF) can do so directly without a separate igniter, and the distance of focusing initiation is much smaller than that of the deflagration-to-detonation transition, thereby greatly improving the performance of detonation engines. In this paper, the process of SWF detonation initiation with decane as the fuel is simulated, and it is found that the energy in the focusing region is high enough to initiate detonation directly. The total temperature and pressure of the incident flow are changed to study how the inlet parameters influence SWF. It is found that the total pressure of the incoming flow affects the SWF considerably whereas the influence of the total temperature can be ignored. The experimental results show that a kerosene–air detonation can be initiated successfully by SWF, thereby verifying the feasibility of SWF detonation with no pre-combustion chamber or igniter. The simulation and experimental results show that SWF detonation initiation has considerable advantages and potential.

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Investigating an annular nozzle on combustion products of hydrocarbon fuels

Cited by 4 publications

References 6 publications

Experimental Diagnosis on Combustion Characteristic of Shock Wave Focusing Initiation Engine

Experimental Diagnosis on Combustion Characteristic of Shock Wave Focusing Initiation Engine

Numerical simulation of spinning detonation in circular section channels

Influence of flow parameters on single shock-wave-focusing detonation and initial verification

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