Numerical Studies of Mixing and Flame-Turbulence Interactions in Shear Coaxial Injector Flows Under Trans-Critical Conditions

Approach for simulating gas–liquid-like flows under supercritical pressures using a high-order central differencing scheme

“…For example, large-eddy simulations (LES) of supercritical spatially mixing flows were conducted by Oefelein and Yang [2], Meng and Yang [3], Zong et al [4], and Masquelet et al [5]. In addition, Bellan [6], Miller et al [7], and Okong'o and Bellan [8] employed direct numerical simulation (DNS) for simple temporal mixing layers under supercritical conditions using a high-order compact scheme.…”

Real gas CFD simulations of hydrogen/oxygen supercritical combustion

“…Further large eddy simulations of reacting and nonreacting supercritical jets were performed by Zong and Yang [14], Schmitt et al [1517] and Matsuyama et al [18] as well as by Jarczyk and P¦tzner [19], Petit et al [20] and the group around Menon [21]. The laminar §amelet model was used, e. g., by Matsuyama et al [18] to validate the simulation results against experimental test data obtained at the P8 combustor at the DLR for supercritical pressures.…”

Numerical simulations of mixing under supercritical pressures of a shear coaxial injector using a high-order method: effect of outer jet temperature

“…They revealed that, with increasing cham-that unsteady mixing is dominated by 3D helical instabilities (which is di¨erent from a gas jet with axisymmetric instabilities) and relatively small temperature §uctuations lead to large density §uctuations due to the strong thermodynamic gradients in the transcritical regime. Masquelet et al [12] made a comparison between experimental results [5] and those obtained using LES, and reasonable agreement was found in experimental time-averaged statistics and distribution of LOx core lengths. Schmitt et al [13] investigated the structure of transand supercritical nitrogen jets formed by a coaxial injector operating under high pressure using LES and compared their theoretical results with the experimental ones.…”

“…Following the discussion in [12], it is expected that the values in the range of 0.72 < ρ * < 0.86 are considered as the reference values for determining dense-core length because densities between 550 and 650 kg/m 3 correspond to the transcritical transition between liquid and supercritical §uid under 10 MPa.…”