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Numerical simulation of a hydrocarbon fuelled valveless pulsejet

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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Non-invasive optical characterization and estimation of Zn porosity in gas tungsten arc welding of Fe–Al joints using CR model and OES measurements

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Plasma Science and Technology 2023年第11期25卷 133-141页

作者： sai srikar Tinku KUMAR Degala Venkata KIRAN Reetesh Kumar GANGWAR Department of Physics&CAMOST Indian Institute of Technology TirupatiYerpedu 517619India Department of Mechanical Engineering Indian Institute of Technology TirupatiYerpedu 517619India

In this study,we employed a non-invasive approach based on the collisional radiative(CR)model and optical emission spectroscopy(OES)measurements for the characterization of gas tungsten arc welding(GTAW)discharge and quantification of Zn-induced porosity during the GTAW process of Fe–Al *** OES measurements were recorded as a function of weld current,welding speed,and input *** OES measurements revealed significant line emissions from Zn-I in 460–640 nm and Ar-I in 680–800 nm wavelength ranges in all experimental *** OES coupled CR model approach for Zn-I line emission enabled the simultaneous determination of both essential discharge parameters *** temperature and electron ***,these predictions were used to estimate the Zn-induced porosity using OES-actinometry on Zn-I emission lines using Ar as actinometer *** OES-actinometry results were in good agreement with porosity data derived from an independent approach,i.e.x-ray radiography *** current study shows that OES-based techniques can provide an efficient route for real-time monitoring of weld quality and estimate porosity during the GTAW process of dissimilar metal joints.

关键词： optical emission spectroscopy collisional radiative model actinometry GTAW Fe Al joints Zn vapor porosity radiographic imaging(Some figures may appear in colour only in the online journal)

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