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<p>The U.S. Navy's concern with steam-induced jet engine stall has become more pertinent with the introduction of the  F-35C. During take offs on aircraft carriers, steam from aging catapult systems can potentially seep onto the flight  deck. When ingested into jet engines, this steam may increase the engines' susceptibility to stall. The serpentine air  inlet ducts and single engine of the F-35C could make it especially vulnerable to this steam-induced stall during  takeoff. To better understand and predict steam-induced stall, this study created a computational fluid dynamics  (CFD) simulation of steam-induced stall on a single blade passage of a compressor rotor. A single blade passage of  the transonic Sanger rotor was generated using computer modeling software. This model was then used in the  ANSYS CFX computational fluid dynamics program to simulate steady-state and steam ingestion operations at 95%  and 100% rotor design speeds. These CFD simulations generated compressor maps and throttle and steam-induced  stall points. The CFD results were then compared to results from throttle-induced stall and steam-induced stall  experiments conducted on the Sanger rotor in the transonic compressor rig. This study verified that CFD can estimate  steam-induced stall operating margin reduction.
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<br>Subjects: Naval aviation; Steam; Jet engines</div>
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Hedges, Collin R.</div>
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