Large-eddy simulation of methane direct injection using the full injector geometry
نویسندگان
چکیده
Understanding the mixing process of under-expanded gaseous-fuel jets from an outward opening injector is essential for developing Direct Injection (DI) internal combustion engines. This paper presents a Large-Eddy Simulation (LES) study DI methane into Constant Volume Chamber (CVC), considering full, geometry prototype injector. Four cases at conditions relevant to Compressed Natural Gas (CNG) engines are investigated, with as surrogate CNG. A new post-processing method permits 3D LES field be projected 2D density gradient that can compared schlieren image. The results then validated against high-speed, imaging experiments, demonstrating simulations able reproduce experimental trends. Three main regions external flow observed: recirculation zone just downstream tip, stagnation and far-mixing zone. location increases CVC pressure decreases, consistent theory presented in literature. modelling full leads determination losses. Once loss within considered, short version reasonably represent prediction flow.
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ژورنال
عنوان ژورنال: Fuel
سال: 2021
ISSN: ['0016-2361', '1873-7153']
DOI: https://doi.org/10.1016/j.fuel.2020.120019