Abstract
The effects of the fuel temperature on diesel nozzle internal flow and the subsequent atomization were analyzed experimentally. Flow visualization was studied using a 10-times scaled-up transparent acrylic model nozzle with different geometries. A high-speed digital camera was used to capture the flow pattern in the region of the sac chamber and the nozzle. The energy loss in the occurrence of the hydraulic flip was also analyzed. In addition, cavitation images obtained in the multi-hole tapered nozzle with different fuel temperatures had revealed that although the conical shape of the converging tapered holes suppresses formation of geometry-induced cavitation, string cavitation has been clearly observed anyway. Afterward, the experimental method was used to analyze the effects of the nozzle sac volume structure on the cavitation flow inside the nozzle and subsequent spray. It was found that the in-nozzle flow stage and spray formation were sensitive to the fuel temperature. The visual experiment is helpful to understand the nozzle flow and optimize the diesel injectors eventually.
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