Dynamic stability of atmospheric entry probes

Details Dynamic stability of atmospheric entry probes Dynamic stability of atmospheric entry probes

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.544..101k&link_type=abstract

In: Proceedings of the International Workshop Planetary Probe Atmospheric Entry and Descent Trajectory Analysis and Science, 6-9

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Planetary Atmospheres, Entry Probes

Scientific paper

Entry probes are known to become dynamically unstable at the end of their trajectories. Possible mechanisms to drive entry probes into dynamic instability are investigated in the present study. Flow field and surface pressure variations were characterized in incompressible subsonic flow regime around a representative probe geometry. Experimental studies identified two characteristics frequencies in the near wake. On the one hand, compared to the flight frequency of the vehicle derived from the governing equations of the atmospheric entry, these frequencies are found to be at least one order of magnitude different. Therefore, the near wake is hardly responsible for the dynamic instability. On the other hand, when the model is forced to oscillate at its non-dimensional flight frequency, although the mean flow characteristics remain similar, a hysteresis in the surface pressure between the stroke-up and stroke-down motion was observed. Expressed in mathematical form, these hysteresis led to a governing equation similar to those employed in the conventional approach. Comparison of damping terms obtained from flow field analysis to those determined from dynamic stability tests showed good agreement.

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