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EXPERIMENTAL STUDY ON THE EFFECTS OF AIR ENTRAINMENT ON A PLANE jet DIFFUSION IN A PLUNGE POOL

Journal of Hydrodynamics 1999年第2期11卷 32-37页

作者： Guo, Yakun Luo, Ming Sichuan univ Chengdu China

Laboratory experimental results about the effects of air entrainment on the jet diffusion in a plunge pool were presented. The results indicate that the air entrainment has little effect on the maximum mean impinging pressure generated by the jet at pool bottom. The maximum fluctuating pressure is increased with the increase of the air entrainment. Air entrainment also reduces jet spreading.

关键词： Air ejectors Energy dissipators jet engines jets Pressure effects Pressure measurement Velocity measurement

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HIGH TEMPERATURE COMPOSITES

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Acta Metallurgica Sinica(English Letters) 1995年第Z1期8卷 467-476页

作者： M. V. Nathal (NASA Lewis Research Center Cleveland OH. USA) NASA Lewis Research Center Cleveland United States

The purpose of this paper is to review the current state of development of new composite materials for advanced aircraft engines. The advantages and disadvantages of ***-base, and MoSi_2-base composites as replacements for today's Ni-base superalloys are discussed from the standpoint of key technical issues. current status, and future directions. Results describing progress in both improved understanding of the mechanisms of deformation and fracture, and improved material performance will be covered.

关键词： composites. Ti alloys Ti-aluminides NiAl MoSi_2-base jet engines

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Numerical simulation of a hydrocarbon fuelled valveless pulsejet

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Propulsion and Power Research 2014年第2期3卷 90-95页

作者： Joseph Kalyan Raj Isac Logu Mohanraj Enumula Srikar Sai Vijay Kumar Kannan CD-adapco India Private Limited BangaloreKarnataka 560066India Park College of Engineering and Technology CoimbatoreTamilnadu 641659India

jet propulsion technology has been limited to being identified largely with turbojets and turbo-machinery driven jet *** late there has been a renewed interest in pulsejet technology and it has once again caught the imagination of *** specific characteristics of the pulsejet,such as easy scalability,absence of moving parts,reduced combustion temperatures;lower NOX formation and the like make it possess varied capabilities for use in the field of jet propulsion and the most viable option for small-scale jet *** the current work,a numerical analysis encompassing feasibility and validation of a valveless pulsejet engine was attempted using CD-adapco's STAR-CCM+CFD *** to lack of comprehensive established mathematical laws to govern the working of a pulsejet,most experimental work being performed is done by trial and *** necessitates in-depth computational studies in order to shed more light on the understanding of valveless *** results have been encouraging and in agreement with observed experimental conclusions such as,i)changes in dimensions affect the working of a pulsejet,ii)presence of a flare enhances the working of a pulsejet,and the close agreement in the frequency of *** continuous study,an optimum initial condition was achieved which enabled the pulsejet to begin operation even before 0.05 s,thereby greatly reducing computational costs if a higher time-scale were to be used.

关键词： Pulsejet Pulsed-combustion jet engines Computational fluid dynamics Eddy-break up model Combustion modelling Propulsion STAR-CCM+

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