Abstract
Hydrodynamics simulation results of dynamic compression experiments performed by extended two-stage Gas Gun (GG) driven graded density impactor (GDI) or functionally graded material (FGM) impact with high impedance material and subsequent hypervelocity generation are reported. Treating a recently published experiment as reference, possible ways of further enhancing flyer velocity has been explored and limitation of this conventional hypervelocity launcher (HVL) is brought out. We put forward a new configuration of HVL that has the potential to enhance both graded density and FGM flyer velocity to a great extent. It is shown that quadratic FGM serves best in the proposed HVL with velocity enhancement factor of 1.96 and 2.12 for thin and thicker flyers respectively, whereas maximum reported value till date is 1.6.Thermodynamic properties of target compressed by conventional and proposed HVL are investigated theoretically. Out of the two approaches of dynamic compression, we show that target compression follows quasi-isentropic path for proposed HVL, in contrast to shock loading for conventional HVL design. Signatures of isentropic compression are identified from applied pressure profile and target temperature rise.Further, our simulation study reveals that irrespective of thickness, flyer velocity amplification lies around 2.0 for a wide range of GG drive velocity, thereby demonstrating the scalability of proposed HVL. Maximum velocity enhancement factor of 2.6 for thin and 3.5 for relatively thicker flyers have been achieved for low drive velocity in the new configuration.
Published Version
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