Fuel Injection Systems

A numerical study on the effect of cavitation erosion in a diesel injector

“…The injection operation point selection, and in particular the pressure level, is then a main design trade-off between reducing engine emissions and increasing the risk of incurring in cavitation erosion. Simulation tools that allow to predict the cavitation erosion risk are then of great interest to the injector manufacturers, that could use them in the design process to create geometries less prone to cavitation erosion also at high pressure levels [1,2,3].…”

Effect of submillimeter size holes on the fatigue limit of a high strength tool steel

“…Diesel fuel injection is a particular application where design against fatigue in the presence of small holes or orifices in the very high cycle regime is relevant. Repeated high pressure pulses generate cyclic loading in diesel fuel injectors . Fuel injectors are fabricated from hardened high strength tool steel materials.…”

“…A potential challenge for evaluating materials for their response to high pressure pulses is to develop a specimen design and testing methodology that introduces cyclic stress fields similar to those at the tip of a diesel fuel injector. The fuel injector tip experiences high frequency cyclic stresses that are concentrated by the geometry of multiple fuel injection orifices . In the present investigation, a two pronged stress life and fracture mechanics approach was developed and implemented on a generic tool steel material.…”

“…Repeated high pressure pulses generate cyclic loading in diesel fuel injectors. 6 Fuel injectors are fabricated from hardened high strength tool steel materials. As shown in Fig.…”

“…The fuel injector tip experiences high frequency cyclic stresses that are concentrated by the geometry of multiple fuel injection orifices. 6 In the present investigation, a two pronged stress life and fracture mechanics approach was developed and implemented on a generic tool steel material. Stress life or S-N tests were performed in the very high cycle regime on smooth specimens without any additional stress concentrators to identify the weakest links in the microstructure.…”