Large Eddy Simulation of diesel injector opening with a two phase cavitation model

[摘要] In the current paper, indicative results of the flow simulation during the opening phase of a Diesel injector are presented. In order to capture the complex flow field and cavitation structures forming in the injector, Large Eddy Simulation has been employed, whereas compressibility of the liquid was included. For taking into account cavitation effects, a two phase homogenous mixture model was employed. The mass transfer rate of the mixture model was adjusted to limit as much as possible the occurrence of negative pressures. During the simulation, pressure peaks have been found in areas of vapour collapse, with magnitude beyond 4000bar, which is higher that the yield stress of common materials. The locations of such pressure peaks corresponds well with the actual erosion location as found from X ray scans.

[发布机构] City University London, Northampton Square, EC1V 0HB, United Kingdom^1;Caterpillar Inc., Mossville; IL; 61602, United States^2

[关键词] Cavitation effect;Cavitation model;Cavitation structure;Common materials;Complex flow field;Homogenous mixtures;Mass transfer rate;Negative pressures