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仪器网/ 行业应用/ 解决方案/ 多台阶通道中的爆震衍射

多台阶通道中的爆震衍射

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This research investigated multiple detonation diffraction events in order to better
understand the limits and benefits of diffraction strategies with respect to pulse
detonation engine design. Hydrogen/air detonations were generated using swept
ramp obstacles in a 1.27 m long channel with a cross section of 25.4 mm by 88.9
mm and were diffracted into various multiple-stepped openings. This allowed the
detonation wave diffraction transmission limits to be determined for hydrogen/air
mixtures and to better understand reinitiating mechanisms throughout the
diffraction process. Tests were conducted for area ratios ranging from 2.002.60
with varying equivalence ratios from 0.51.5.
Computational methods were used to better understand the diffraction
phenomenon using a series of sensitivity studies for different chemistry sets,
computational cell size and equivalence ratio. Experimental tests used combined
optical shadowgraph and particle image velocimetry imaging systems to provide
shock wave detail and velocity information. The images were observed through
a newly designed explosive proof optical section and split flow detonation
channel. It was found that area ratios of 2.0 could survive single and double
diffraction events over a range an equivalence ratio range of 0.8 to 1.14 Area
ratios of 2.3 survived the primary diffraction event for equivalence ratios near
stoichiometric for the given step length. Detonation diffraction for area ratios of
2.6 did not survive the primary diffraction event for any equivalence ratio and
were unable to transmit to a larger combustor. 德国LaVision PIV/PLIF粒子成像测速场仪
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