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Cavity flow in doublelayer multiholes diesel injector nozzle |
School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract In diesel engines,the cavity flow in nozzles not only greatly affects the characteristics of fuel atomization, but also has great influence on the subsequent combustion and exhaust emissions. However, the changing of detail structure of diesel nozzle tip greatly affects the flow characteristics in the nozzle hole. Taking a certain type of nozzle as research object, the simulative calculation model of multiphases flow in the engine nozzle hole with highpressure injection was established by AVL FIRE software. The effects of different orifice position and injection pressure on the characteristics of twophase flow were investigated. The results show that when the injection pressure is fixed, the happened moment, the distribution region and the intension of cavitation in nozzle are affected by nozzle position, and the distribution of pressure, the turbulence velocity and the liquid turbulence energy are also different. When the injection pressure changes, the intension of the cavitation phenomena is promoted by the increase of injection pressure.
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Received: 09 June 2014
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