To study the influence of plasma on scramjet nozzle performance, O radicals, H radicals, and OH radicals were added in scramjet nozzle inlet condition to simulate chemical effect of plasma. The 9-specice and19-step finite-rate chemical reaction models of H2/Air combustion, finite volume method with implicit scheme, and RNG k-ε turbulence models were adopted to calculate the chemical non-equilibrium flow in scramjet nozzle. The results show that the non-equilibrium effect can not be neglected in scramjet nozzle with hydrogen fuel working at the condition of Ma=11, h=40 km. Lift and thrust will be enhanced by 3.63% and 2.21% when mass fractions of O radicals, H radicals and OH radicals are increased by 0.64%, 0.15%, and 0.64%, respectively. Enhancement of scramjet nozzle performance is proportional to individually addition of O radicals, H radicals or OH radicals but accelerated with synthetically addition of these radicals, which proves that the performance of scramjet nozzle can be improved by chemical effect of plasma.
KEY WORDS :scramjet;nozzle;lift;thrust;radical;plasma;non-equilibrium reactive flow;
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