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Abstract
Hydrogen is the cleanest fuel available because its combustion product is water. The internal combustion engine can, in principle and without significant modifications, run on hydrogen to produce mechanical energy. Regarding the technological solution leading to compact engines, a question to ask is the following: Can combustion engine systems be lubricated with hydrogen? In general, since many applications such as in turbomachines, is it possible to use the surrounding gas as a lubricant? In this paper, journal bearings global parameters are calculated and compared for steady state and dynamic conditions for different gas constituents such as air, pentafluoropropane, helium and hydrogen. Such a bearing may be promising as an ecological alternative to liquid lubrication.
Highlights
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The hydrogen internal combustion engine could contribute to meeting the following double challenge already identified: remedying the scarcity of oil resources and reducing greenhouse gas emissions, provided, the hydrogen used is not made from fossil fuels
The pressure field in the bearings is obtained by solving the steady-state generalized Reynolds equation (GRE) (6) for turbulent, compressible fluids with variable viscosity across the film thickness
Summary
The hydrogen internal combustion engine could contribute to meeting the following double challenge already identified: remedying the scarcity of oil resources and reducing greenhouse gas emissions, provided, the hydrogen used is not made from fossil fuels. The use of a nonlinear EoS (equation of state) capable of describing the variation in density as a function of pressure and temperature, and of the vapor/liquid transition, is necessary. Noting that cmin is the minimal speed of sound in the vapor phase [13] calculated from pressure, density, and the adiabatic index γ for an ideal isentropic gas. The latter is assumed to be 7/5, as is the case for the diatomic molecules from the kinetic theory
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