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The Role of Large Scale Mixing and Radiation in the Scaling of NOx Emissions From Unconfined Flames
Newbold, Greg J.R.,Nathan, Graham J.,Nobes, David S.,Turns, Stephen R. The Korean Society of Combustion 2002 한국연소학회지 Vol.7 No.1
Measurements of global emissions, flame radiation and flame dimensions are presented for unconfined turbulent-jet and precessing-jet diffusion flames. Precessing jet flames are characterised by increases in global flame radiation and global flame residence time for methane and propane fuels, however a strong dependency of the NOx emission indices on the fuel type exists. The fuel type dependence is considered to be because soot radiation is more effective than gas-radiation at reducing global flame temperatures relative to adiabatic flame temperatures and reducing the NO production rate.
HYDRODYNAMIC THRUST BEARINGS WORKING IN SPECIAL CONDITIONS
TUAN, NGUYEN ANH,TURN, TRAN VIET ENGINEERING TRIBOLOGY RESEARCH INSTITUTE KYUNGPOOK 2000 INTERNATIONAL SYMPOSIUM ON HIGH PERFORMANCE OF TRI Vol.2000 No.-
This study modeled the real behavior of an hydrodynamic thrust bearing. A theory is developed to know the geometry of the contact and the start of the complete fluid film for each pad and at every time. Moreover the solution of the energy equation for the film and the heat transfer equation for the solids are used to calculated the temperature in every point of the thrust bearing. In the case of misalignment, the numerical procedure gives the working parameters for each pad. As the characteristics of the fluid going out one pad (leakage and temperature) influence the feeding conditions of the following pads, the lubricant recirculation at the inlet is taken into account. The results obtained for a misaligned hydrodynamic thrust bearing are presented. The influence of the degree of misalignment and the conditions of feeding is studied. The pressure field, the leakage, the temperature variations in the fluid film are presented. The operating characteristics of a thrust bearing are obtained by the simultaneous resolution of the Reynolds, the energy and heat transfer equations.