Document
LOW DENSITY SUPERSONIC DECELERATOR (LDSD)
SUPERSONIC FLIGHT DYNAMICS TEST (SFDT)
PLUME INDUCED ENVIRONMENT MODELLING
1 2 3 4 5
B. L. Mobley , S. D. Smith , J. W. Van Norman , S. Muppidi and I. Clark
Objectives:
LDSD SFDT 1, 2 Trajectories
POWERED ASCENT RELEASE FROM BALLOON VEHICLE SPIN - DOWN
• Provide p lume induced heating (radiation & convection) predictions in support of the
6.0 65
LDSD thermal design (pre - flight SFDT - 1)
5.0 60
• Predict plume induced aerodynamics in support of flight dynamics, to achieve targeted
freestream conditions to test supersonic deceleration technologies (post - flight SFDT - 1, 4.0 55
pre - flight SFDT - 2)
3.0 50 VEHICLE SPIN - UP Approach: Altitude (km) Mach Number
• Star48 and Small Solid Nozzle Flow Fields – RAMP engineering code
2.0 45
• Star48 and Small Solid Plume Flow Fields – Loci/CHEM 3.3 CFD code
• Plume Radiation – Reverse Monte Carlo (RMC) radiation c ode
SPIN - UP MOTORS 1.0 40 (2 PAIRS)
• Reynolds Averaged Navier - Stokes (RANS) Simulations (varying fidelity, grids)
SPIN - DOWN MOTORS (2 PAIRS)
• Two - phase Flow (Gas + Al O particles)
2 3 0.0 35 0 10 20 30 40 50 60 70 80
• Two Gaseous Species (thermally perfect, equivalent air and plume, frozen chemistry)
ORBITAL - ATK STAR48 Time (Seconds) (20% OFFLOADED TO REDUCE BURN TIME) Aerospace Engineer, EV33 Aerosciences Branch, Marshall Space Flight Center, Huntsville, Alabama, 35811 Senior Aerospace Engineer, Plumetech , Huntsville, Alabama, 35811 SFDT-1 Trajectory, Altitude (km) SFDT-2 Trajectory, Altitude (km) Senior Project Engineer , Analytical Mechanics Associates, Hampton, Virginia, 23666 Research Scientist, ERC, Mountain View, California, 94035 SFDT-1 Trajectory, Mach Number SFDT-2 Trajectory, Mach Number LDSD Principal Investigator, Jet Propulsion Laboratory, Pasadena, California, 91109