Optimisation of molecular structure for traction fluids
According to the guidelines for the molecular design of traction base fluids obtained from a previous study, more than 100 chemical compounds have been synthesised. Employing 61 naphthenic compounds whose chemical structures have been clearly identified, the optimisation of molecular structure has been studied regarding the compatibility of high-temperature traction coefficient and low-temperature fluidity. As a result, the requirements for molecular structures for high-performance traction base fluids have been clarified.
A reconstruction method of soot volume fraction and temperature distribution based on back-projection of flame image dual-channel intensities was proposed.The cross-section contour profiles of ethylene/air non-premixed axisymmetric flame were reconstructed.The results show that the inner ethylene gas was not thoroughly ignited before the middle of the flame,where the maximum cross-section average temperature and volume fraction occurred.The maximum fraction occurs near flame edge and is vulnerable to temperature change or oxygen concentration variation.