Experimental and three-dimensional numerical investigations on H2/air continuous rotating detonation wave

2012 ◽  
Vol 227 (2) ◽  
pp. 326-341 ◽  
Author(s):  
Shi-Jie Liu ◽  
Zhi-Yong Lin ◽  
Wei-Dong Liu ◽  
Wei Lin ◽  
Ming-Bo Sun
Keyword(s):  
Detonation Wave ◽  
Three Dimensional ◽  
Numerical Investigations ◽  
Rotating Detonation

scholarly journals Effects of Diverging Nozzle Downstream on Flow Field Parameters of Rotating Detonation Combustor

2019 ◽  
Vol 9 (20) ◽  
pp. 4259 ◽  
Author(s):  
Chengwen Sun ◽  
Hongtao Zheng ◽  
Zhiming Li ◽  
Ningbo Zhao ◽  
Lei Qi ◽  
...  
Keyword(s):  
Detonation Wave ◽  
Flow Field ◽  
Three Dimensional ◽  
Great Influence ◽  
Working Environment ◽  
Propagation Process ◽  
High Pressure And Temperature ◽  
Numerical Studies ◽  
Temperature Load ◽  
Rotating Detonation

In this study, three-dimensional numerical studies have been performed to investigate the performance of a rotating detonation combustor with a diverging nozzle downstream. The effects of a diverging nozzle on the formation and propagation process of a detonation wave and typical flow field parameters in a rotating detonation combustor are mainly discussed. The results indicate that the diverging nozzle downstream is an important factor affecting the performance and design of a rotating detonation combustor. The diverging nozzle does not affect the formation and propagation process of the rotating detonation wave, while the time of two key wave collisions are delayed during the formation process of the detonation wave. With increases of the diverging angle, the rotating detonation combustor with the diverging nozzle can still maintain a certain pressure gain performance. Both the diverging nozzle and diverging angle have great influence on the flow field parameters of the rotating detonation combustor, including reducing the high pressure and temperature load, making the distribution of the outlet parameters uniform, and changing the local supersonic flow at the outlet. Among them, the outlet static pressure is reduced by up to 88.32%, and the outlet static temperature is reduced by up to 32.12%. This evidently improves the working environment of the combustor while reducing the thermodynamic and aerodynamic loads at the outlet. In particular, the diverging nozzle does not affect the supersonic characteristics of the outlet airflow, and on this basis, the Mach number becomes coincident and enhanced.

scholarly journals The effect of wall temperature on three-dimensional rotating detonation wave

2021 ◽  
Vol 1786 (1) ◽  
pp. 012045
Author(s):  
Pengxin Liu ◽  
Chen Li ◽  
Dong Sun ◽  
Qilong Guo ◽  
Wei Zhao
Keyword(s):  
Detonation Wave ◽  
Wall Temperature ◽  
Three Dimensional ◽  
Rotating Detonation

Wall effect on the flow structures of three-dimensional rotating detonation wave

2020 ◽  
Vol 45 (53) ◽  
pp. 29546-29559 ◽  
Author(s):  
Pengxin Liu ◽  
Qilong Guo ◽  
Dong Sun ◽  
Chen Li ◽  
Hanxin Zhang
Keyword(s):  
Detonation Wave ◽  
Three Dimensional ◽  
Wall Effect ◽  
Flow Structures ◽  
Rotating Detonation

Numerical investigations of three-dimensional flows around a cylinder attaching with symmetric strips

2021 ◽  
Vol 33 (7) ◽  
pp. 075101
Author(s):  
Chunhui Ma ◽  
Weiwen Zhao ◽  
Decheng Wan
Keyword(s):  
Three Dimensional ◽  
Numerical Investigations

Experimental and Numerical Study of Mixing in a Hot-Water Storage Tank

2009 ◽  
Vol 131 (1) ◽  
Author(s):  
A. Aviv ◽  
Y. Blyakhman ◽  
O. Beeri ◽  
G. Ziskind ◽  
R. Letan
Keyword(s):  
Numerical Model ◽  
Storage Tank ◽  
Numerical Study ◽  
Tap Water ◽  
Three Dimensional ◽  
Hot Water ◽  
Software Validation ◽  
Water Storage Tank ◽  
Thermal Mixing ◽  
Numerical Investigations

Thermal mixing and stratification are explored numerically and experimentally in a cylindrical tank, which simulates a storage of water heated by a solar collector. The tank is 70cm in height and 24cm in diameter. The inlet and outlet are vertical and located off the centerline of the tank. The study is conducted in a transient mode, namely, the tank is filled with hot water, and as the hot water is being withdrawn, the tap water replaces it in a stratified way or by mixing. The flowrates of 2l∕min, 3l∕min, 5l∕min and 7l∕min, which correspond to superficial velocities of 4.35cm∕min, 6.52cm∕min, 10.87cm∕min, and 15.2cm∕min, are explored. Temperature of hot water ranges within 40–50°C, while the tap water is about 25–27°C. Installation of one and two horizontal baffles above the inlet is examined. Simultaneous experimental and numerical investigations are performed. In the experiment, both flow visualization and temperature measurements are used. Three-dimensional transient numerical simulations are done using the FLUENT 6 software. Validation of the numerical model is achieved by comparison with the experimental results. Then, the numerical model is applied to a study of various possible changes in the system. The results show that at low flowrates, up to a superficial velocity of about 11cm∕min through the tank, the baffles have no effect on tap water mixing with the stored hot water. At higher flowrates, a single horizontal baffle prevents the mixing and preserves the desired stratified temperature distribution in the storage tank.

scholarly journals Characteristics of a Non-Premixed Rotating Detonation Combustor Using Natural Gas-Hydrogen Blend at Elevated Air-Preheat Temperature and Backpressure

2018 ◽  
Author(s):  
Arnab Roy ◽  
Donald Ferguson ◽  
Todd Sidwell ◽  
Peter Strakey
Keyword(s):  
Experimental Study ◽  
Natural Gas ◽  
Detonation Wave ◽  
Inlet Temperature ◽  
Operational Mode ◽  
Atmospheric Conditions ◽  
Theoretical Understanding ◽  
Air Inlet ◽  
Continuous Detonation ◽  
Rotating Detonation

Operational characteristics of an air breathing Rotating Detonation Combustor (RDC) fueled by natural gas-hydrogen blends are discussed in this paper. Experiments were performed on a 152 mm diameter uncooled RDC with a combustor to inlet area ratio of 0.2 at elevated inlet temperature and combustor pressure while varying the fuel split between natural gas and hydrogen over a range of equivalence ratios. Experimental data from short-duration (∼6sec) tests are presented with an emphasis on identifying detonability limits and exploring detonation stability with the addition of natural gas. Although the nominal combustor used in this experiment was not specifically designed for natural gas-air mixtures, significant advances in understanding conditions necessary for sustaining a stable, continuous detonation wave in a natural gas-hydrogen blended fuel were achieved. Data from the experimental study suggests that at elevated combustor pressures (2–3bar), only a small amount of natural gas added to the hydrogen is needed to alter the detonation wave operational mode. Additional observations indicate that an increase in air inlet temperature (up to 204°C) at atmospheric conditions significantly affects RDC performance by increasing deflagration losses through an increase in the number of combustion (detonation/Deflagration) regions present in the combustor. At higher backpressure levels the RDC exhibited the ability to achieve stable detonation with increasing concentrations of natural gas (with natural gas / hydrogen-air blend). However, losses tend to increase at intermediate air preheat levels (∼120°C). It was observed that combustor pressure had a first order influence on RDC stability in the presence of natural gas. Combining the results from this limited experimental study with our theoretical understanding of detonation wave fundamentals provides a pathway for developing an advanced combustor capable of replacing conventional constant pressure combustors typical of most power generation processes with one that produces a pressure gain.

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