Computational Fluid Dynamics Validation of a Single, Central Nozzle Supersonic Retropropulsion ConfigurationReportar como inadecuado


Computational Fluid Dynamics Validation of a Single, Central Nozzle Supersonic Retropropulsion Configuration


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Supersonic retropropulsion provides an option that can potentially enhance drag characteristics ofhigh mass entry, descent, and landing systems. Preliminary flow field and vehicle aerodynamiccharacteristics have been found in wind tunnel experiments; however, these only cover specificvehicle configurations and freestream conditions. In order to generate useful aerodynamic data thatcan be used in a trajectory simulation, a quicker method of determining vehicle aerodynamics isrequired to model supersonic retropropulsion effects. Using computational fluid dynamics, flowsolutions can be determined which yield the desired aerodynamic information. The flow fieldgenerated in a supersonic retropropulsion scenario is complex, which increases the difficulty ofgenerating an accurate computational solution. By validating the computational solutions againstavailable wind tunnel data, the confidence in accurately capturing the flow field is increased, andmethods to reduce the time required to generate a solution can be determined. Fun3D, acomputational fluid dynamics code developed at NASA Langley Research Center, is capable ofmodeling the flow field structure and vehicle aerodynamics seen in previous wind tunnelexperiments. Axial locations of the jet terminal shock, stagnation point, and bow shock show thesame trends which were found in the wind tunnel, and the surface pressure distribution and dragcoefficient are also consistent with available data. The flow solution is dependent on thecomputational grid used, where a grid which is too coarse does not resolve all of the flow featurescorrectly. Refining the grid will increase the fidelity of the solution; however, the calculations willtake longer if there are more cells in the computational grid.



Space Systems Design Lab Technical Papers -



Autor: Cordell, Christopher E., Jr. - Braun, Robert D. - -

Fuente: https://smartech.gatech.edu/







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