Numerical results of gaseous ethylene and propane fuel preinjection in a hypersonic three-dimensional inlet and the attendant fuel–air mixing enhancement process are analyzed. Fuel is injected in the wake of thin swept pylons located on the inlet’s compression surface (installed normal to the wall), 1–2 injector diameters downstream of the pylons. Mixing in the near vicinity of the pylons is calculated using the Favre-averaged Navier–Stokes equations for three-dimensional, turbulent, multispecie, nonreacting ows, taking into account all of the jets. Calculations of the ow eld in the far mixing region of the inlet channel are based on solutions of the parabolized Navier–Stokes equations. It is shown that fuel–air mixing ef ciencies between 0.95 and 0.98 are possible for fuel–air equivalence ratios between 0.3 and 0.7 before exiting an inlet channel whose length is 0.65m.
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Guoskov et al. (2001) studied this question.
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