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fuel Property effects on Liquid and Vapor Penetrations of Evaporating Sprays

Journal of Shanghai Jiaotong university(Science) 2018年第1期23卷 33-37页

作者：赵博林陈谦斌 University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong University

The purpose of this study is to investigate the effect of fuel properties on liquid and vapor penetrations in evaporating spray systems. A recently developed model, which can simultaneously account for the finite thermal conductivity, finite mass diffusivity and turbulence effects within atomizing multi-component liquid fuel sprays, is utilized for the numerical predictions. Two different multi-component fuels with different boiling temperatures,densities and other thermal properties are implemented in the KIVA-3V computational fluid dynamics(CFD)code to study the evaporation behaviors. A six-component surrogate fuel is used to emulate the relevant volatility property of the real diesel fuel, and a second bi-component fuel is chosen to represent a low boiling-temperature fuel. The numerical results are compared with the experimental data, and the representative results are *** a lower density and lower boiling temperature fuel, the liquid penetration length is shorter. However, the vapor penetration lengths are not affected by the fuel type in terms of fuel volatility. Available experimental data are used for validation and appraisal of the multi-component evaporation model.

关键词： evaporating spray multi-component fuel fuel effects liquid length vapor penetration

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Experimental study on impacts of fuel type on thermo-acoustic instability in a gas turbine model combustor

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Science China(Technological Sciences) 2021年第6期64卷 1345-1358页

作者： RUAN Can CHEN FeiEr YU Tao CAI WeiWei HE ZhuoYao MAO YeBing LI XinLing LU XingCai School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

effects of liquid fuel composition variations on characteristics of self-excited thermo-acoustic instabilities in a lean premixed,pre-vaporized gas turbine model combustor were experimentally *** fuels included practical RP-3 jet fuel and its blending with iso-octane and n-dodecane,which were branched and linear alkanes *** the test conditions,dynamic pressure measurements indicated that the dominant instability frequency was highest for RP-3 flame,while RP-3/ndodecane flame exhibited the strongest instability strength.A further analysis showed that the instability frequency correlated well with the profiles of adiabatic flame temperature,and the strength of the instability highly depended on the ignition delay times of the *** of the flame structure and flow field with OH*chemiluminescence (CL) imaging and twodimensional particle image velocimetry (PIV) techniques indicated that changes in the fuel composition did not alter the unstable modes and general sequences of flame-flow structure *** power spectra and proper orthogonal decomposition(POD) analysis suggested that axial oscillations along with precessing vortex core (PVC) induced helical motion predominated periodic flame structure and flow field oscillations.

关键词： combustion gas turbine engine fuel effects thermo-acoustic instability PIV

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