Theoretical approach and experimental verification of the role of diffusive transport under binary scaling conditions

Integration of Arc-jet in Impulse Facility for Hypervelocity Aerothermal Testing with Ablation

“…This demands a higher performance in the expansion tube to drive a stronger shock through denser shock/expansion tubes. Also, a subscale model requires a much higher freestream density to retain density-length and binary scaling [39,40]. Hence, new expansion tube conditions were designed and tested to replicate the key representative trajectory points in flight.…”

“…The smaller size of the model is advantageous with smaller nose radius 𝑅 will reach higher 𝑇 𝑤 for ablation. For density-length scaling, however, a smaller size requires a much higher freestream density (𝜌 ∞ ) to properly match binary scaling in expansion tube flows [39,40]. The density is limited by the performance of the impulse facility.…”

Aerospace Flight Modeling and Experimental Testing

“…In that case, the binary scaling parameter ρ L must be reproduced in order to obtain the correct Da [16]. One could note that the diffusion phenomena is also considered in this analysis, as the diffusion term in the equation scale with ρ L [5]. With this approach, the high-enthalpy facilities are designed to reproduce the real flight velocities (V ∞ ) and to allow for an operation considering the ρ L parameter as they can be represented in the graph of Fig.…”