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Stability analyses of the mass abrasive projectile high-speed penetrating into concrete target. Part Ⅱ: Structural stability analyses

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Acta Mechanica Sinica 2014年第6期30卷 943-955页

作者： Hao Wu Xiao-Wei Chen Qin Fang Li-Lin He Institute of Systems Engineering China Academy of Engineering Physics State Key Laboratory for Disaster Prevention & Mitigation of Explosion & Impact PLA University of Science and Technology

The initial oblique and attacking angles as well as the asymmetrical nose abrasion may lead to bending or even fracture of a projectile,and the penetration efficiency decreases *** structural stability of a high-speed projectile non-normally penetrating into concrete and the parametric influences involved are analyzed with the mass abrasion taken into *** considering the symmetrical or asymmetrical nose abrasion as well as the initial oblique and attacking angles,both the axial and the transverse drag forces acting on the projectile are *** on the ideal elastic-plastic yield criterion,an approach is proposed for predicting the limit striking velocity（LSV）that is the highest velocity at which no yielding failure has occurred and the projectile can still maintain its integral structural ***,some particular penetration scenarios are separately discussed in *** on the engineering model for the mass loss and nose-blunting of ogive-nose projectiles established in Part I of this study,the above approach is validated by several high-speed penetration *** analysis on parametric influences indicates that the LSV is reduced with an increase in the asymmetrical nose abrasion,thelength-diameter-ratio,and the concrete strength,as well as the oblique and attacking ***,the LSV raises with an increase in the initial caliber-radius-head（CRH）and the dimensionless cartridge thickness of a projectile.

关键词： Projectile High-speed penetration Concrete oblique angle Attacking angle Asymmetrical nose abrasion

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The Impingement Heat Transfer Data of Inclined Jet in Cooling Applications: A Review

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Journal of Thermal Science 2020年第1期29卷 1-12页

作者： PAWAR Shashikant PATEL Devendra Kumar SMEC Vellore Institute of Technology

On the impingement heat transfer data,the experimental studies of air and liquid jets impingement to the flat surfaces were collected and critically *** oblique impingements of both single circular and planar slot jets were considered in *** review focused on the surface where the jet impingement cooling technique was *** nozzle exit Reynolds numbers based on the hydraulic diameter varied in the range of 1,500–52,*** oblique angles relative to the plane surface and the dimensionless jet-to-plate spacing vary in the range of 15°–90°and 2–12 *** review suggested that the magnitude of maximum heat transfer shifted more for air jets compared with the liquid *** drop in the inclination angle and the jet-to-plate separation led to the increase in the asymmetry of heat transfer *** displacement of maximum Nusselt number(heat transfer)locations was found to be sensitive to the inclination angle and the smaller jet-to-plate ***,the Nusselt number correlations proposed by various researchers were discussed and compared with the results of the cited references.

关键词： heat and fluid flow jet impingement Nusselt number oblique angle

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