On theory and methods for advanced detonation-driven hypervelocity shock tunnels

Abstract

This study describes theory and methods for developing detonation-driven shock tunnels in hypervelocity test facilities. The primary concept and equations for high-enthalpy shock tunnels are presented first to demonstrate the unique advantage of shock tubes for aerodynamic ground-based testing. Then, the difficulties in simulating flight conditions in hypervelocity shock tunnels are identified, and discussed in detail to address critical issues underlying these difficulties. Theory and methods for developing detonation drivers are proposed, and relevant progress that has advanced the state of the art in large-scale hypersonic test facilities is presented with experimental verifications. Finally, tailored conditions for detonation-driven shock tunnels are described, laying a solid foundation to achieve long test duration. This interface-matching key issue encountered in developing shock tunnels has been investigated for decades, but not solved for detonation drivers in engineering applications.

Influence of thermochemical nonequilibrium on expansion tube air test conditions: A numerical study

“…At present, large-scale facilities are the subject of significant interest, which is expected to further increase in the future. [33][34][35] Thus, the accelerator gas slug is initially 25 m long to model a 25 m acceleration tube corresponding to a large-scale ET like the LENS XX and X3. 9,22 The initial length of the test gas slug is 10 m, which is long enough to prevent the unsteady expansion fan head from reaching the moving wall during the time scales considered for the current work.…”

A multi-relaxation-time discrete Boltzmann model of compressible nonequilibrium reactive flows

“…hypervelocity flight vehicle, detonation, high temperature and pressure combustion, etc. [4,5]. At present, it is still an open issue to investigate the reactive flows that usually involve compressible effects, consist of spatiotemporal multiscale structures, and contain chemical, hydrodynamic and thermodynamic nonequilibrium processes [6][7][8].…”