科研之友
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摘要
A novel heated-tip multihole spark-ignition direct-injection injector was designed and manufactured to investigate its coupling mechanism of the multiphysical fields and comprehensive performances. The coupling relationship and formation among the electromagnetic, thermal, fluid flow, and spray fields was analyzed based on coupling theories. A data information interface platform was established based on the commercial software, which was used to explore how the key parameters impact the novel spark-ignition direct-injection injector. According to the relationship among the different physical fields, coupling models were established based on the finite element method, and the comprehensive performances of the spark-ignition direct-injection injector were analyzed systematically. Systematic experiments were used to validate and verify the coupling mechanism and the accuracy of the simulation model. The comparisons of the conventional spark-ignition direct-injection injector and novel heated-tip multihole injector indicated that the novel heated-tip spark-ignition direct-injection injector has the ability to heat the fuel to a high temperature in a short time. The high temperature is the key factor that changes the electromagnetic characteristics, dynamic response, cavitation structure, and spray characteristics.
