The Measurement of Silicon, Tin, and Titanium in Jet-Engine Oil
A wear metal profile is often prepared for each engine. Typically an early wear-in period of high metals concentration is observed, followed by a plateau of low metals concentration [2]. Impending component failure will be indicated by a rapid increase in wear metal concentration, or the sudden appearance of a metal. The metal type and concentration may also indicate to the analyst and engineers which part of an engine is failing. A change in the concentration of sodium for example, may indicate an antifreeze leakage, the increased presence of lead may indicate the wear of bearings in a diesel engine [3].
Quantitative multielement determination of metallic wear species in lubricating oils and hydraulic fluids
An analytical method for the particle size independent determination of Al, Cr, Cu, Fe, Mg, Mo, Ni, Pb, Si, Sn, Ti, and Zn in lubricating oils and hydraulic fluids by atomic emission spectrometry and atomic absorption spectrophotometry is presented. Improved analyses of Ag, Cd, and Na were also accomplished. Metal powder suspensions in hydraulic fluids and lubricating oils were reacted with a small amount of an acid mixture containing hydrofluoric, nitric, and hydrochloric acids and analyzed by a DCP emission specrometer. The recoveries of Al, Cr, Cu, Fe, Mg, Mo, Ni, Pb, Si, Sn, Ti, and Zn ranged from 89% to 102% with relative standard devlations from 2% to 12%. In addition to the metal powder suspensions, aircraft, automobile, and diesel truck engine oils and aircraft hydraulic fluids were analyzed by atomic emission spectrometry and flame atomic absorption spectrophotometry. 4 figures, 6 tables.
Research on velocity distribution in semi-dry flue gas desulfurization tower
As an accurate high-quality instantaneous measurement technology, particle image velocimetry (PIV in acronym) has applied widely in single-phase flow and multiphase flow. The velocity distribution in semi-dry FGD tower directly influences gas-solid mix and contact situation. In base of the tower, gas-solid two-phase flow field is more complex, and has the quite tremendous influence to the overall system desulphurization efficiency. This paper utilized PIV to study velocity distribution in Semi-dry flue gas desulfurization tower and obtained velocity distribution.