Principle study on the bidirectional detonation driving technique for dual-state synchronous-running shock tunnels
Detonation-driven shock tunnels are ground-based test facilities used to generate hypersonic and high-enthalpy test flows.They are usually divided into forward detonation-driven(FDD)shock tunnel and backward detonation-driven(BDD)shock tunnel.Aiming at avoiding the deficiency of the driving mode,either FDD or BDD,a new bidirectional detonation driving(BiDD)technique is proposed in this paper.Two test flows of medium enthalpy and high enthalpy are realized at the same time in one running of BiDD by synchronously using the high-energy wave front and the steady section following the end of Taylor expansion wave of a detonation.In this paper,the key wave dynamic processes in a BiDD shock tunnel are simulated and analyzed by using the numerical algorithms for high-temperature thermos-chemically reacting flow.The numerical results indicate that the proposed BiDD driving technique is feasible.In addition,the state adjustments of the BDD and FDD subsections are relatively independent,which can cover the cross-flow-regime test capacity of total enthalpies between medium and high levels.
high-enthalpy test flowbidirectional detonation drivershock tunnelthermo-chemically reactive flowtailored interface condition
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维普
