Fuel and Combustion

Fuel and Combustion

Numerical Study of Trans/Supercritical Jets Mixing of Bi-Shear Injectors Under Excitation

Document Type : Original Article

Authors
Aerospace Engineering, Sharif University of Technology, Tehran, Iran
10.22034/jfnc.2024.450542.1385
Abstract
This investigation explores the mixing dynamics of transcritical and supercritical jets under excitation in cryogenic bi-shear coaxial injector. The study identifies dominant frequencies in the flow field and oscillates the inlet velocity of propellants, LN2 and GN2. Utilizing a 35-degree sector and applying Large Eddy Simulation (LES) alongside the Peng-Robinson equation of state and Chung method, enables the assessment of evaluate the thermodynamic and transport properties in real cryogenic fluids. Results show that oscillations enlarge Kelvin-Helmholtz instability-induced vortex structures, particularly in the supercritical gas jet, enhancing turbulent mixing and, the thermal-shield undergoes localized distortions, improving heat transfer, enhancing mixing, and shortening the jet core.
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