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← ScienceWhich outcome reduces the efficiency of a liquid rocket engine when extremely hot gas jets pass the nozzle throat?
A)Increased boundary layer flow separation✓
B)Reynold's lamina transitions remain constant
C)Improved combustion chamber pressure stability
D)Enhanced heat transfer near injector
💡 Explanation
Increased boundary layer flow separation results from high Reynolds numbers promoting turbulence in hot gas because rapid flow causes increased frictional losses and decreased thrust efficiency. Therefore, the correct answer is flow separation, rather than pressure increases, since turbulence disrupts ideal expansion.
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