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• W275405428 abstract "This work presents results from the STATICS 1 spray rig, an adjustable single-orifice laboratory spray with carefully designed inlet parameters, employed here to produce a steady non-cavitating spray. This spray system can be adjusted to achieve a range of conditions which are representative of liquid breakup near or within the high-pressure atomization regime common to fuel injection applications. By isolating the developing spray from cavitation disturbances, other factors which impact the form of the liquid breakup are more readily distinguished and experimental results can be generated under conditions which are readily accessible for numerical spray modeling efforts. A common feature observed in shadowgrams and ballistic images of pressure atomizing plain-orifice sprays is an apparent spreading of the liquid mass as it moves downstream. This can give the impression that the jet is growing even as some regions of the flow shed mass into the surrounding environment in the form of ligaments and droplets. However, in the case of the steady, unperturbed spray arrangement this characteristic spreading is virtually absent from the high-speed shadowgram results, indicating that some aspect of the flow which is significant to the spray formation may be missing from the tailored inlet conditions. Recent large eddy simulation (LES) results for interior flows in transient fuel sprays indicate that large vortices are created inside the injector body in response to turbulent upstream conditions. These coherent vortical structures are expected to break down as the fuel flow moves through the narrow geometry preceding the injector orifice. However, in most cases a non-zero mean rotational velocity persists in the bulk flow as it exits the nozzle, potentially generating significant changes in the character of the liquid breakup which can be observed in the spray morphology. The inlet conditions of the STATICS spray rig were adjusted to allow a comparative study of the effects of low-level swirl on the character of the spray. Here, the same spray conditions were run with a swirled inlet condition effected by adding a swirl trip upstream of the orifice. In addition, supplementary measurements of a single-hole, plain-orifice diesel fuel injection spray were undertaken to provide a qualitative comparison with a standard common-rail diesel fuel injection condition, which could be examined for evidence of similar swirl characteristics. In this case, high-speed shadowgraphy with front-lighting was used to visualize the spray edges and highlight salient surface texture which could then be correlated to estimate swirl imparted to the liquid jet." @default.
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• W275405428 date "2014-01-01" @default.
• W275405428 modified "2023-09-26" @default.
• W275405428 title "Visualization of low-level swirl effects in fuel injection sprays" @default.
• W275405428 hasPublicationYear "2014" @default.
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