The Experts below are selected from a list of 73290 Experts worldwide ranked by ideXlab platform
Fengchen Zhuang - One of the best experts on this subject based on the ideXlab platform.
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experimental study on Propagation Mode of h2 air continuously rotating detonation wave
International Journal of Hydrogen Energy, 2015Co-Authors: Jin Zhou, Fengchen ZhuangAbstract:Abstract The Propagation Mode of H2/Air continuously rotating detonation waves (CRDWs) has been experimentally studied in a rotating detonation engine (RDE) Model which injected gaseous H2 and Air in slit-orifice collision Mode. Experiments were conducted by varying injection conditions (different mass flow rates and equivalence ratio) at atmospheric backpressure, and thereby four typical detonation Propagation Modes were concluded. Moreover, the injection conditions, as well as the time domain and frequency domain characteristics for each Mode were detailedly analyzed. Results show that: for the test Model with an oxidizer injection throat of 0.4 mm wide, H2/Air CRDW usually propagated in an one-way Mode as the mass flow rate increased, which in sequence included three sorts of Mode: single wave Mode, single/dual-wave hybrid Mode, and dual-wave Mode. However, after the blow-off N2 was injected and the H2 flow began to decrease, the detonation was possible to be maintained in a special dual-wave collision Mode. This collision Mode was more likely to be observed in the test Model with a narrower oxidizer injection throat of 0.2 mm wide. At lower mass flow rate, CRDWs tended to show unstable dual-wave collision Mode, and the collision points slowly moved back and forth within a small azimuthal angle; with the mass flow rate increasing, the collision points remained stable and CRDWs propagated in stable dual-wave collision Mode.
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experimental study on Propagation Mode of h2 air continuously rotating detonation wave
International Journal of Hydrogen Energy, 2015Co-Authors: Wei Lin, Zhiyong Lin, Jin Zhou, Shijie Liu, Fengchen ZhuangAbstract:Abstract The Propagation Mode of H2/Air continuously rotating detonation waves (CRDWs) has been experimentally studied in a rotating detonation engine (RDE) Model which injected gaseous H2 and Air in slit-orifice collision Mode. Experiments were conducted by varying injection conditions (different mass flow rates and equivalence ratio) at atmospheric backpressure, and thereby four typical detonation Propagation Modes were concluded. Moreover, the injection conditions, as well as the time domain and frequency domain characteristics for each Mode were detailedly analyzed. Results show that: for the test Model with an oxidizer injection throat of 0.4 mm wide, H2/Air CRDW usually propagated in an one-way Mode as the mass flow rate increased, which in sequence included three sorts of Mode: single wave Mode, single/dual-wave hybrid Mode, and dual-wave Mode. However, after the blow-off N2 was injected and the H2 flow began to decrease, the detonation was possible to be maintained in a special dual-wave collision Mode. This collision Mode was more likely to be observed in the test Model with a narrower oxidizer injection throat of 0.2 mm wide. At lower mass flow rate, CRDWs tended to show unstable dual-wave collision Mode, and the collision points slowly moved back and forth within a small azimuthal angle; with the mass flow rate increasing, the collision points remained stable and CRDWs propagated in stable dual-wave collision Mode.
Changsheng Zhou - One of the best experts on this subject based on the ideXlab platform.
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Propagation process of h2 air rotating detonation wave and influence factors in plane radial structure
International Journal of Hydrogen Energy, 2018Co-Authors: Changfei Zhuo, Changsheng ZhouAbstract:Abstract The rotating detonation wave (RDW) Propagation processes and influence factors are simulated in the plane-radial structure. The effects of inner radii of curvature, domain widths and stagnation pressures on Propagation Mode are studied. The RDW is initiated, and two kinds of Propagation Mode are obtained and analyzed. The flow field structure, parameters variation and influence factors on unstable Propagation Mode are explored in depth, and the geometrical and injection conditions of the unstable Propagation are obtained. Results indicate that the decoupling and re-initiation occur repeatedly during the unstable Propagation Mode of the RDW, and the angular velocities of leading shock wave vary accordingly. When the domain width remains constant, the range of stagnation-pressure under unstable Propagation Mode increases as the inner radius increases. But the RDW propagates steadily when the inner radius increases to a certain value (Larger than 40 mm in this study). The effect of curvature radius and initial pressure ahead of detonation wave on the unstable Propagation Mode in this calculation Model is similar to that in a curved channel. When ri +0.464pa > 80.932 or ri ≥ 40 mm, the detonation wave can propagate steadily in the annular domain. When the curvature radius remains constant, the stagnation-pressure range of the unstable Propagation Mode decreases as the domain width increases.
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effects of a turbine guide vane on hydrogen air rotating detonation wave Propagation characteristics
International Journal of Hydrogen Energy, 2017Co-Authors: Shengbing Zhou, Shuai Li, Changsheng ZhouAbstract:Abstract The rotating detonation engine is a new machine that can generate thrust via continuous rotating detonation waves (RDWs). In this study, experiments were performed on a structure combining a rotating detonation combustor (RDC) and a turbine guide vane to investigate the Propagation characteristic of hydrogen-air RDW. The results showed that the velocity of detonation wave initially increased and then decreased with the increase of equivalence ratio, and it got a velocity of 84% Chapman-Jouguet value. The velocity of detonation wave generally rose by 4.31% comparing with the no guide vane tests, while the scope of steady-operation state became narrow. The oscillation pressure was reduced by 64% after passing through the guide vane, and the magnitude of pressure was only 0.4 bar at the guide vane exit. Meanwhile, part of the shock wave was reflected back to combustor resulting in some small pressure disturbances, and the Propagation Mode of reflected wave was related to the Propagation direction of RDW.
Xiang Zhang - One of the best experts on this subject based on the ideXlab platform.
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extraordinary optical transmission induced by excitation of a magnetic plasmon Propagation Mode in a diatomic chain of slit hole resonators
Physical Review B, 2009Co-Authors: Tao Li, Qianjin Wang, Shuming Wang, Jingning Li, Xiang ZhangAbstract:In this paper, we will propose that magnetic-resonance nanostructures in a metal surface could be used to realize extraordinary optical transmission EOT. Toward this goal, we designed and fabricated a onedimensional diatomic chain of slit-hole resonator SHR. Due to the strong exchange current interaction, a type of magnetic plasmon MP Propagation Mode with a broad frequency bandwidth was established in this system. Apparent EOT peaks induced by the MP Mode were observed in our measured spectra at infrared frequencies. The strongest EOT peak was obtained at 1.07 eV with an incident angle of 20°. The measured dependence of EOT peaks on the incident angle coincided with the theoretical results quite well. This proposed MP Propagation Mode in SHR structure has good potential applications in multifrequency nonlinear optical processes.
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Extraordinary optical transmission induced by excitation of a magnetic plasmon Propagation Mode in a diatomic chain of slit-hole resonators
Physical Review B, 2009Co-Authors: Hui Liu, Qianjin Wang, Zhi-an Zhu, S. M. Wang, Shining Zhu, Yunzhi Zhu, Xiang ZhangAbstract:In this paper, we will propose that magnetic-resonance nanostructures in a metal surface could be used to realize extraordinary optical transmission (EOT). Toward this goal, we designed and fabricated a one-dimensional diatomic chain of slit-hole resonator (SHR). Due to the strong exchange current interaction, a type of magnetic plasmon (MP) Propagation Mode with a broad frequency bandwidth was established in this system. Apparent EOT peaks induced by the MP Mode were observed in our measured spectra at infrared frequencies. The strongest EOT peak was obtained at 1.07 eV with an incident angle of $20\ifmMode^\circ\else\textdegree\fi{}$. The measured dependence of EOT peaks on the incident angle coincided with the theoretical results quite well. This proposed MP Propagation Mode in SHR structure has good potential applications in multifrequency nonlinear optical processes.
Jin Zhou - One of the best experts on this subject based on the ideXlab platform.
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experimental study on Propagation Mode of h2 air continuously rotating detonation wave
International Journal of Hydrogen Energy, 2015Co-Authors: Jin Zhou, Fengchen ZhuangAbstract:Abstract The Propagation Mode of H2/Air continuously rotating detonation waves (CRDWs) has been experimentally studied in a rotating detonation engine (RDE) Model which injected gaseous H2 and Air in slit-orifice collision Mode. Experiments were conducted by varying injection conditions (different mass flow rates and equivalence ratio) at atmospheric backpressure, and thereby four typical detonation Propagation Modes were concluded. Moreover, the injection conditions, as well as the time domain and frequency domain characteristics for each Mode were detailedly analyzed. Results show that: for the test Model with an oxidizer injection throat of 0.4 mm wide, H2/Air CRDW usually propagated in an one-way Mode as the mass flow rate increased, which in sequence included three sorts of Mode: single wave Mode, single/dual-wave hybrid Mode, and dual-wave Mode. However, after the blow-off N2 was injected and the H2 flow began to decrease, the detonation was possible to be maintained in a special dual-wave collision Mode. This collision Mode was more likely to be observed in the test Model with a narrower oxidizer injection throat of 0.2 mm wide. At lower mass flow rate, CRDWs tended to show unstable dual-wave collision Mode, and the collision points slowly moved back and forth within a small azimuthal angle; with the mass flow rate increasing, the collision points remained stable and CRDWs propagated in stable dual-wave collision Mode.
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experimental study on Propagation Mode of h2 air continuously rotating detonation wave
International Journal of Hydrogen Energy, 2015Co-Authors: Wei Lin, Zhiyong Lin, Jin Zhou, Shijie Liu, Fengchen ZhuangAbstract:Abstract The Propagation Mode of H2/Air continuously rotating detonation waves (CRDWs) has been experimentally studied in a rotating detonation engine (RDE) Model which injected gaseous H2 and Air in slit-orifice collision Mode. Experiments were conducted by varying injection conditions (different mass flow rates and equivalence ratio) at atmospheric backpressure, and thereby four typical detonation Propagation Modes were concluded. Moreover, the injection conditions, as well as the time domain and frequency domain characteristics for each Mode were detailedly analyzed. Results show that: for the test Model with an oxidizer injection throat of 0.4 mm wide, H2/Air CRDW usually propagated in an one-way Mode as the mass flow rate increased, which in sequence included three sorts of Mode: single wave Mode, single/dual-wave hybrid Mode, and dual-wave Mode. However, after the blow-off N2 was injected and the H2 flow began to decrease, the detonation was possible to be maintained in a special dual-wave collision Mode. This collision Mode was more likely to be observed in the test Model with a narrower oxidizer injection throat of 0.2 mm wide. At lower mass flow rate, CRDWs tended to show unstable dual-wave collision Mode, and the collision points slowly moved back and forth within a small azimuthal angle; with the mass flow rate increasing, the collision points remained stable and CRDWs propagated in stable dual-wave collision Mode.
Shijie Liu - One of the best experts on this subject based on the ideXlab platform.
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The effect of cavity on ethylene-air Continuous Rotating Detonation in the annular combustor
International Journal of Hydrogen Energy, 2019Co-Authors: Hao-yang Peng, Shijie Liu, Weidong Liu, Hai-long ZhangAbstract:Abstract The realization and stable operating of Continuous Rotating Detonation (CRD) Engine fueled by hydrocarbon and air is still a problem deserving to be settled. In order to optimize the detonation combustion organization in the annular combustor, an especial cavity structure in the inner cylinder is firstly proposed in this paper. Series of experiments have been conducted for investigating the effect of cavity structure. The results show that ethylene-air CRD has been realized in the annular combustor with cavity. CRD waves propagate steadily with higher pressure and Propagation velocity in the larger operating range. The cavity contributes to the Propagation Mode transformation from two-waves in hetero-rotating Mode to two-waves in homo-rotating Mode. In the cavity combustor, the Propagation velocity is 1228.68 m/s on stoichiometric equivalence ratio (ER) accounting for 67.4% of the corresponding CJ velocity. The permanent flame stabilized in re-circulation zone works as the pilot flame, which has been verified by high-speed photograph images.
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experimental study on Propagation Mode of h2 air continuously rotating detonation wave
International Journal of Hydrogen Energy, 2015Co-Authors: Wei Lin, Zhiyong Lin, Jin Zhou, Shijie Liu, Fengchen ZhuangAbstract:Abstract The Propagation Mode of H2/Air continuously rotating detonation waves (CRDWs) has been experimentally studied in a rotating detonation engine (RDE) Model which injected gaseous H2 and Air in slit-orifice collision Mode. Experiments were conducted by varying injection conditions (different mass flow rates and equivalence ratio) at atmospheric backpressure, and thereby four typical detonation Propagation Modes were concluded. Moreover, the injection conditions, as well as the time domain and frequency domain characteristics for each Mode were detailedly analyzed. Results show that: for the test Model with an oxidizer injection throat of 0.4 mm wide, H2/Air CRDW usually propagated in an one-way Mode as the mass flow rate increased, which in sequence included three sorts of Mode: single wave Mode, single/dual-wave hybrid Mode, and dual-wave Mode. However, after the blow-off N2 was injected and the H2 flow began to decrease, the detonation was possible to be maintained in a special dual-wave collision Mode. This collision Mode was more likely to be observed in the test Model with a narrower oxidizer injection throat of 0.2 mm wide. At lower mass flow rate, CRDWs tended to show unstable dual-wave collision Mode, and the collision points slowly moved back and forth within a small azimuthal angle; with the mass flow rate increasing, the collision points remained stable and CRDWs propagated in stable dual-wave collision Mode.
