Experimental study on the excitation of thermoacoustic instability of hydrogen-methane/air premixed flames under atmospheric and elevated pressure conditions

2019 ◽  
Vol 44 (39) ◽  
pp. 21324-21335 ◽  
Author(s):  
Jianan Zhang ◽  
Albert Ratner
Keyword(s):  
Experimental Study ◽  
Premixed Flames ◽  
Elevated Pressure ◽  
Thermoacoustic Instability

scholarly journals Factors Contributing to Increased Blast Overpressure Inside Modern Ballistic Helmets

2020 ◽  
Vol 10 (20) ◽  
pp. 7193
Author(s):  
Maciej Skotak ◽  
Jonathan Salib ◽  
Anthony Misistia ◽  
Arturo Cardenas ◽  
Eren Alay ◽  
...  
Keyword(s):  
Experimental Study ◽  
Shock Tube ◽  
Principle Component Analysis ◽  
Hot Spots ◽  
Shape Factor ◽  
Elevated Pressure ◽  
Focal Points ◽  
Parietal Region ◽  
Blast Overpressure ◽  
Pressure Fields

This study demonstrates the orientation and the "shape factor" have pronounced effects on the development of the localized pressure fields inside of the helmet. We used anatomically accurate headform to evaluate four modern combat helmets under blast loading conditions in the shock tube. The Advanced Combat Helmet (ACH) is used to capture the effect of the orientation on pressure under the helmet. The three modern combat helmets: Enhanced Combat Helmet (ECH), Ops-Core, and Airframe, were tested in frontal orientation to determine the effect of helmet geometry. Using the unhelmeted headform data as a reference, we characterized pressure distribution inside each helmet and identified pressure focal points. The nature of these localized “hot spots” is different than the elevated pressure in the parietal region of the headform under the helmet widely recognized as the under-wash effect also observed in our tests. It is the first experimental study which indicates that the helmet presence increased the pressure experienced by the eyes and the forehead (glabella). Pressure fingerprinting using an array of sensors combined with the application of principle component analysis (PCA) helped elucidate the subtle differences between helmets.

scholarly journals Experimental study of the influence of hydrogen as a fuel additive on the formation of soot precursors and particles in atmospheric laminar premixed flames of methane

Fuel ◽  
2021 ◽  
Vol 287 ◽  
pp. 119517
Author(s):  
Hong-Quan Do ◽  
Luc-Sy Tran ◽  
Laurent Gasnot ◽  
Xavier Mercier ◽  
Abderrahman El Bakali
Keyword(s):  
Experimental Study ◽  
Premixed Flames ◽  
Fuel Additive ◽  
Soot Precursors

Experimental study on cellular instabilities in hydrocarbon/hydrogen/carbon monoxide–air premixed flames

2011 ◽  
Vol 36 (11) ◽  
pp. 6914-6924 ◽  
Author(s):  
Tran Manh Vu ◽  
Jeong Park ◽  
Jeong Soo Kim ◽  
Oh Boong Kwon ◽  
Jin Han Yun ◽  
...  
Keyword(s):  
Experimental Study ◽  
Carbon Monoxide ◽  
Premixed Flames

330 Experimental Study of Effects of Air Dilution on Wall Impingement Premixed Flames

2014 ◽  
Vol 2014.63 (0) ◽  
pp. _330-1_-_330-2_
Author(s):  
Yoshitaka Nakao ◽  
Tsuneyoshi Matsuoka ◽  
Susumu Noda
Keyword(s):  
Experimental Study ◽  
Premixed Flames ◽  
Wall Impingement
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