Investigation of the end-gas autoignition process in natural gas engines and evaluation of the methane number index

Bestel, Diego; Bayliff, Scott; Xu, Hongtao; Marchese, Anthony J.; Olsen, Daniel B.; Windom, Bret

doi:10.1016/j.proci.2020.07.106

Cited by 9 publications

(1 citation statement)

References 5 publications

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“…Similar to Szybist et al, 6 Pal et al 20 also showed that along with the RON and MON, laminar burning velocity has a significant influence on the knocking phenomena as well. However, the effects of HoV on knocking was not investigated by Pal et al 17,20 Bestel et al 21 performed experiments and 3-D CFD modeling of CFR engine, adapting the realistic CFR engine model from Pal et al 17 The end gas auto ignition was compared between pipeline natural gas and reference methane/hydrogen blends. The 3-D CFD results in this work 21 revealed that (a) the end gas temperature is higher for methane/hydrogen blend and (b) the turbulent flame velocity is similar for both pipeline natural gas and reference methane/hydrogen blends.…”

Section: Introductionmentioning

confidence: 99%

Fuel-air mixing in motored CFR engine at research octane number (RON) relevant condition

Bhattacharya,

Keskinen,

Larmi

et al. 2023

International Journal of Engine Research

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This paper presents a three-dimensional (3-D) computational fluid dynamics (CFD) study of a motored cooperative fuel research (CFR) engine at research octane number (RON) relevant condition. The boundary conditions for 3-D simulations were generated with a one-dimensional GT-Power model. For the first time in literature, a carburetor was added to a virtual CFR engine model with 3-D CFD. Therefore, the proposed setup can simulate the fuel and thermal stratifications inside the engine cylinder with realistic detail. The transient simulations in this work were performed within the Reynolds-averaged Navier-Stokes (RANS) framework with a Realizable k-ε turbulence model. Major conclusions from the present work are: (1) The in-cylinder flow of the CFR engine is swirl-dominated due to the existence of the intake valve shroud. (2) There is a significant amount of liquid droplets entering the cylinder during the intake stroke. The maximum instantaneous amount of liquid for 50% PRF 87 (containing 87% iso-octane and 13% n-heptane (v/v)) and 50% ethanol mixture is indicated to be around 26% of total injected fuel mass. (3) The heat of vaporization (HoV) of the fuel is responsible for creating both temperature and charge stratification inside the cylinder.

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