Experimental investigation on spray and detonation initiation characteristics of premixed/non-premixed RDE

Hao, Lu; Song, Feilong; Jin, Di; Xu, Shaohui; Yang, Xingkui

doi:10.1016/j.fuel.2022.125949

Cited by 13 publications

(2 citation statements)

References 22 publications

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“…Since RDEs have attracted extensive attention as potential fuelers of aerospace and weapons, researchers are focusing on further enhancing the performance of RDEs, such as the propellant injection [3][4][5], combustor geometry [6][7][8][9], method of ignition [10][11][12], and formation mechanism of the rotating detonation wave (RDW) [10,13]. In addition, the rotating detonation rocket engines [14,15], scramjet engines [16][17][18], and turbine engines [19,20] have been built as experimental prototypes to promote engineering application, but the running time of RDEs is limited to seconds due to the harsh thermal environment.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Thermal Prediction and Heat Transfer Characteristics of Two-Phase RDE during Long-Duration Operation

Wang,

Song,

Chen

et al. 2024

Energies

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Accurately predicting the thermal characteristics and heat transfer distribution of the rotating detonation engine (RDE) and acquiring a clear understanding of the performance and mechanism of the rotating detonation are of great significance for achieving the safe and reliable long-duration operation of RDEs. Using RP-3 as fuel, a long-duration experimental study is performed on a 220 mm-diameter RDC to investigate the details with respect to the thermal environment. The heat flux at the typical location and the average heat flux of both the inner and outer cylinders are measured, respectively. Meanwhile, the peak pressure of the rotating detonation wave (RDW) and specific thrust are analyzed. When the ER is between 0.5 and 1 (oxidizer 2 kg/s), the stable rotating detonation mode is obtained, and the detonation duration is set as 40 s to accurately calculate the heat released by the detonation combustion. The heat flux in the upstream region of the RDW location ranges from 2.40 × 105 W/m2 to 3.17 × 105 W/m2, and the heat flux in the downstream area of the RDW location ranges from 1.05 × 106 W/m2 to 1.28 × 106 W/m2. The results demonstrate the important role of the detonation combustion zone, and the thrust performance of RDC can be improved by making the RDW move forward along the RDC axis, which is the optimal direction of detonation combustion. Through a comparison of average heat flux under different conditions, it is found that the heat released by the RDC is directly related to its thrust. In addition, the average heat flux of the inner cylinder is about three times that of the outer cylinder for the two-phase RDC with a Tesla valve intake structure, indicating that the high-temperature combustion product is closer to the inner wall. Therefore, more thermal protection should be allocated to the inner cylinder, and a more systematic analysis of the two-phase flow field distribution in the annular combustion chamber should be carried out to improve the thrust performance. In this paper, the average heat flux of the inner and outer cylinders of the RDC as well as the typical local heat flux of the outer cylinders is quantitatively measured by means of experiments, which not only deepens the understanding of RDC flow field distribution, but also provides quantitative boundary conditions for the thermal protection design of RDCs.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Thermal Prediction and Heat Transfer Characteristics of Two-Phase RDE during Long-Duration Operation

Wang,

Song,

Chen

et al. 2024

Energies

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“…15 The advancement of aviation and aerospace technology has significantly expanded the study of explosive combustion, as evidenced by the "Buzz-Bomb" from World War II and the valuable pressure-gain device, 16 the rotating detonation engine (RDE). 17 Nevertheless, the conversion of coal fuel in detonation engines remains a substantial technical challenge that demands immediate attention.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Application Prospects of Coal Dust/Methane/Oxygen Pulse Detonation Performance: Coal Dust Equivalence Ratio and Types

Guo,

Ge,

Guo

et al. 2024

ACS Omega

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In order to achieve reliable application of coal in pulse detonation combustion chambers, this study explored the influence mechanism of equivalence ratio and coal type (lignite, anthracite) on the detonation characteristics of coal/methane/ oxygen methane-solid two-phase fuel. A high-energy ignition device was used to ignite the preblast methane fuel, and the hightemperature and high-pressure energy generated directly initiated the detonation of coal/methane/oxygen methane-solid two-phase fuel. The experimental results are as follows: (1) The maximum detonation pressure of coal/methane/air fuel is positively correlated with the initial pressure. With the increase of the φ global , the maximum detonation pressure of the two types of coal gradually increases. To be specific, when the φ global rises from 0.5 to 1.6, the sensitivity of lignite and anthracite to the maximum detonation pressure with respect to the initial pressure increases from 4.56 to 6.11 and 5.48, respectively; (2) In terms of detonation flame and maximum pressure wave velocity, anthracite shows better dynamic performance than lignite. The maximum velocity of detonation flame and pressure wave is achieved when the φ global is 1.4.(3) In terms of detonation thrust performance, as the φ global increases from 0.5 to 1.6, the rate of increase in average thrust of the two types of coal first increases and then decreases. Compared with lignite, anthracite has a wider time domain and higher peak value in the average thrust curve and the generated detonation wave displays a greater impulse. The experimental data and conclusions obtained in this study are of practical significance for realizing the engineering application of pulverized coal detonator power generation.

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Polymer/nanodiamond nanocomposites: Fundamentals, fabrication and characteristics

Kausar

2024

Polymer/Nanodiamond Nanocomposites

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Experimental investigation on spray and detonation initiation characteristics of premixed/non-premixed RDE

Cited by 13 publications

References 22 publications

Experimental Investigation of Thermal Prediction and Heat Transfer Characteristics of Two-Phase RDE during Long-Duration Operation

Experimental Investigation of Thermal Prediction and Heat Transfer Characteristics of Two-Phase RDE during Long-Duration Operation

Experimental Study and Application Prospects of Coal Dust/Methane/Oxygen Pulse Detonation Performance: Coal Dust Equivalence Ratio and Types

Polymer/nanodiamond nanocomposites: Fundamentals, fabrication and characteristics

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