Accession Number : AD1051275


Title :   Droplet-Wall/Film Impact in IC Engine Applications


Descriptive Note : Technical Report,01 Aug 2016,30 Apr 2017


Corporate Author : Princeton University Princeton United States


Personal Author(s) : Law, Chung K


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1051275.pdf


Report Date : 14 Aug 2017


Pagination or Media Count : 24


Abstract : Fuels sprayed inside IC-engines can impact the internal surfaces and thus obviates the purpose of atomization. Furthermore, the subsequent film gasification also constitutes a completely different mode of fuel gasification that could fundamentally affect the fuel/air mixing and combustion processes. The accumulation and growth of the film depends on the outcome of subsequent drop impact on the initially formed film, and as such controlling the outcome of the impact is critical for engine operation. In our recent study (Tang, et al., Soft Matter 2016), we presented a regime diagram based on the Weber number We (ratio of impact inertia and surface tension) and the film thickness, delineating the bouncing and merging operating conditions and providing scaling for the transition boundaries of a single liquid (C14 alkane).


Descriptors :   internal combustion engines , fuels , films , viscosity , drops


Subject Categories : Fuels
      Reciprocating and Rotating Engines
      Fluid Mechanics
      Physical Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE