Experimental Study on Lifted Flames Operated with Liquid Kerosene at Elevated Pressure and Stabilized by Outer Recirculation

2013 ◽  
Vol 90 (3) ◽  
pp. 605-619 ◽  
Author(s):  
P. Kasabov ◽  
N. Zarzalis ◽  
P. Habisreuther
Keyword(s):  
Experimental Study ◽  
Elevated Pressure ◽  
Lifted Flames

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 An experimental study of turbulent lifted flames at elevated pressures

2019 ◽  
Vol 203 ◽  
pp. 301-312 ◽  
Author(s):  
Thibault F. Guiberti ◽  
Wesley R. Boyette ◽  
Assaad R. Masri ◽  
William L. Roberts
Keyword(s):  
Experimental Study ◽  
Elevated Pressures ◽  
Lifted Flames

Effects of Flame Lift-Off on the Differences Between the Diffusion Flames From Circular and Elliptic Burners

1998 ◽  
Vol 120 (2) ◽  
pp. 161-166 ◽  
Author(s):  
S. R. Gollahalli
Keyword(s):  
Experimental Study ◽  
Combustion Product ◽  
Axial Velocity ◽  
Diffusion Flames ◽  
Air Entrainment ◽  
Lifted Flames ◽  
The Mean ◽  
Lift Off ◽  
Product Species

An experimental study conducted to determine the effects of lifting the flame base off the burner rim on the differences between the flame characteristics of diffusion flames from circular and elliptic burners is presented. The in-flame profiles of temperature, concentrations of fuel and combustion product species, and the mean and fluctuating components of axial velocity are presented. This study has shown that the effects of burner geometry in turbulent lifted flames are considerable only in the near-burner region. In the midflame and far-burner regions, the effects traceable to burner geometry are much weaker, contrary to those observed in the attached flame configuration. The observations are attributed to the turbulence and additional air entrainment into the jet prior to the flame base accompanying the lift-off process, which mitigate the effects of burner geometry.

Modeling and experimental study of CO2 corrosion on carbon steel at elevated pressure and temperature

2015 ◽  
Vol 27 ◽  
pp. 1620-1629 ◽  
Author(s):  
Rida Elgaddafi ◽  
Adarsh Naidu ◽  
Ramadan Ahmed ◽  
Subhash Shah ◽  
Shokrollah Hassani ◽  
...  
Keyword(s):  
Experimental Study ◽  
Carbon Steel ◽  
Elevated Pressure ◽  
Co2 Corrosion

Experimental Study of Large Scale Fluidized Beds at Elevated Pressure

2011 ◽  
Vol 51 (4) ◽  
pp. 1962-1969 ◽  
Author(s):  
Willem Godlieb ◽  
Sander Gorter ◽  
Niels G. Deen ◽  
J. A. M. Kuipers
Keyword(s):  
Experimental Study ◽  
Fluidized Beds ◽  
Large Scale ◽  
Elevated Pressure

scholarly journals Experimental Study of Hydraulic Sealability and Shear Bond Strength of Cementitious Barrier Materials

2021 ◽  
Author(s):  
Mohammadreza Kamali ◽  
Mahmoud Khalifeh ◽  
Elsayed Eid ◽  
Arild Saasen
Keyword(s):  
Experimental Study ◽  
Bond Strength ◽  
Shear Bond Strength ◽  
Elevated Pressure ◽  
Cementitious Materials ◽  
Barrier Materials ◽  
Naturally Occurring ◽  
Bottom Hole ◽  
Slurry Preparation ◽  
Push Out

Abstract In this experimental study, two different cementitious materials including (i) a class of expansive cement that is currently used for P&A operations, and (ii) a non-cement-based naturally occurring rock, known as geopolymer are selected to examine the hydraulic bond strength and shear bond strength. Clean machined steel and rusty corroded steel were selected to represent the casing. The test samples were cured at 90 °C, which is considered as bottom-hole static temperature (BHST), and under elevated pressure of 17.2 MPa for one week. The hydraulic sealability of the barrier materials tested up to 3.4 MPa of differential pressure. The results indicated that additives used in slurry preparation have an impact on the hydraulic sealability of the material. Additionally, the rusty corroded streel provided a better hydraulic sealability comparing to the clean machined steel for the same cementitious material. The shear bond strength test was performed by running the push-out test. According to the present test observations, no correlation was found between the shear bond and hydraulic bond strength of different barrier materials. The geopolymer showed the lowest shear bond strength, while it provided the highest hydraulic sealability.

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