Hydrogen-air, ethylene-air, and methane-air continuous rotating detonation in the hollow chamber

Peng, Haoyang; Liu, Weidong; Liu, Shijie; Zhang, Hailong; Jiang, Luxin

doi:10.1016/j.energy.2020.118598

Cited by 37 publications

(8 citation statements)

References 37 publications

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“…The effects of an empty bucket combustor and a concave chamber on the detonation propagation characteristics of a CRDE have also been studied. These results show that the RDW propagation velocity and stability for an empty bucket combustor are higher than those for other combustors 18–21 . Additionally, to experimentally observe the RDW propagation process, visualization techniques such as high‐speed photography have been used to observe the intensity and propagation direction of RDWs 22 .…”

Section: Introductionmentioning

confidence: 93%

“…These results show that the RDW propagation velocity and stability for an empty bucket combustor are higher than those for other combustors. [18][19][20][21] Additionally, to experimentally observe the RDW propagation process, visualization techniques such as high-speed photography have been used to observe the intensity and propagation direction of RDWs. 22 OH chemiluminescence imaging technology has been used to investigate the effects of nonideal combustion phenomena 23 such as parasitic combustion 24 on detonation wave propagation characteristics, as well as the effects of gas reflux on the performance and stable operation of CRDEs.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on the effect of injection pressure ratio on the propagation characteristics of hydrogen rotating detonation waves

Bai

Han

et al. 2022

Energy Science & Engineering

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This study aimed to evaluate the effects of the ratio of air injection pressure to hydrogen injection pressure (p R = p A /p H ) on the propagation characteristics of rotating detonation waves (RDWs) and the working range of continuous rotating detonation engines (CRDEs). To this end, experiments were conducted under different injection pressure ratios and air mass flow rates with hydrogen as the fuel and air as the oxidant. The results reveal that RDWs can propagate in a stable manner when the injection pressure ratio is 0.67-1.7; however, RDW propagation is unstable when the injection pressure ratio is 0.51-0.67 and 1.7-2.03. The formation of unstable detonation waves may be attributed to the long response times at low pressures and the poor mixing effect of hydrogen and air. Furthermore, under an injection pressure ratio of 2.08-3.09, CRDE initiation failed. As the air mass flow rate increased, the range of the injection pressure ratio increased and the CRDE operated in a stable manner. In addition, the RDW velocity first increased and then decreased as the injection pressure ratio increased. Notably, under an air injection pressure of 3.6 bar, the rotation direction of the RDW changed during propagation.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Experimental study on the effect of injection pressure ratio on the propagation characteristics of hydrogen rotating detonation waves

Bai

Han

et al. 2022

Energy Science & Engineering

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“…Therefore, many researchers have conducted in-depth analysis on the propagation mode and characteristics of RDW. Due to the high activity and easy initiation of gaseous fuels, a series of RDW experimental study using hydrogen, methane and other gases as fuels have been carried out [3][4][5], and single wave model [6][7][8], two-counter RDW model [9,10], single and double wave mixing model [11,12], multi wave mode [11][12][13] have been observed. In addition, there are a lot of numerical simulation work to conduct in-depth research on the flow field characteristics of RDW generated by gaseous fuel, and analyze in detail the change of flow field state from ignition to stabilization [14,15].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on propagation characteristics of rotating detonation wave of liquid kerosene with oxygen-enriched air

Han

Zheng

Huang

et al. 2023

J. Phys.: Conf. Ser.

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In order to study the propagation characteristics of rotating detonation wave (RDW) of liquid fuel, an experimental study was carried out with liquid kerosene at room temperature as fuel and oxygen-enriched air with oxygen volume fraction of 38.5% as oxidant in this paper. RDW with equivalence ratio in the range of 0.65~0.9 was successfully obtained by controlling kerosene mass flow, and a detailed analysis of propagation characteristics of RDW was carried out. The results show that with the increase of equivalence ratio, the propagation state of RDW gradually changes from the premature flameout of discontinuous detonation to the complete operation of continuous detonation. The flow blockage of the injectors will further worsen the mixing effect under low equivalence ratio conditions, resulting in the discontinuous detonation phenomenon of repeated flameout-initiation process in the combustion chamber. In this study, almost all detonation waves operate in two-counter RDW mode, except that there is a single wave mode in a short period after flameout-initiation process.

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“…Zhang et al [15] found that the CRD wave was more accessible to form in a hollow combustor than in an annular combustor. Peng et al [16] demonstrated the realization of hydrogen/air, ethylene/air, and methane/air CRD waves in a hollow combustor and demonstrated that the large combustor width and recirculation zone had a significant effect on the CRD realization. Yokoo et al [17] found that the combustor length did not have a great influence on the detonation wave propagation velocity and thrust performance in the hollow combustor.…”

Section: Introductionmentioning

confidence: 99%

“…In the rocket mode of the CRD engine, the interaction of the CRD wave with the inflow was discussed. Peng et al [16] found that the CRD wave propagated upstream through the oblique shock wave, and the angle of the oblique shock wave varied depending on the fuel type. Rankin et al [22] observed that the high-pressure detonation wave could inhibit the inflow of the fuel during the purging period.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of a Cylindrical Air-Breathing Continuous Rotating Detonation Engine with Different Nozzle Throat Diameters

et al. 2022

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A continuous detonation engine with various exhaust nozzles, analogous to typical scramjet cavity combustors with variable rear-wall heights, was adopted to perform a succession of cylindrical air-breathing continuous rotating detonation experiments fueled by a non-premixed ethylene/air mixture. The results show that the detonation combustion was observed to self-sustain in the combustor through simultaneous high-speed imaging covering the combustor and isolator. A long test, lasting more than three seconds, was performed in this unique configuration, indicating that the cylindrical isolator–combustor engine exhibits potential for practical applications. Three distinct combustion modes were revealed with varied equivalent ratios (hybrid mode, sawtooth wave mode, and deflagration mode). The diameter of the nozzle throat was critical in the formation of rotating detonation waves. When the nozzle throat diameter was larger than the specific value, the detonation wave could not form and self-sustain. The upstream boundary of the shock train was supposed to be close to the isolator entrance in conditions of a high equivalence ratio and small nozzle throat diameter. In addition, it was verified that periodic high-frequency pressure oscillation could cause substantial impacts on the incoming flow as compared with the steady deflagration with the same combustor pressure.

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Hydrogen-air, ethylene-air, and methane-air continuous rotating detonation in the hollow chamber

Cited by 37 publications

References 37 publications

Experimental study on the effect of injection pressure ratio on the propagation characteristics of hydrogen rotating detonation waves

Experimental study on the effect of injection pressure ratio on the propagation characteristics of hydrogen rotating detonation waves

Experimental study on propagation characteristics of rotating detonation wave of liquid kerosene with oxygen-enriched air

Experimental Investigation of a Cylindrical Air-Breathing Continuous Rotating Detonation Engine with Different Nozzle Throat Diameters

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