Phase II Final Report - NASA's Institute for Advanced Concepts

Planetary Exploration Using Biomimetics
An Entomopter for Flight on Mars
0.165
0
Cm( acos( 0.75) , t)
0.2
− 0.235 0.4
0 0.1 0.2
0 t
0.167
Figure 3-122: Moment Coefficient vs. Time
3.892
5
Cp( acos( 0.75) , t)
0
− 1.648
5
0 0.1 0.2
0 t
Figure 3-123: Power Coefficient vs. Time
0.167
3.3.3.9 Validation of Results
Figure 3-124 gives the CFD results of the unblown case for the same baseline configuration.
Although the curve depicts the total value of lift and thrust force as a function of time, if normalized,
the C L values vary from approximately -2 to +4, which are bit higher than those obtained
by the analytical model. This is because the leading edge vortex has not been modeled in the
analytical model. Second, camber effects have been neglected, which will contribute to increase
the lift coefficient value, but it can be deduced that the analytical model though approximate,
gives the same shape of curve and the results are in the same range.
140
Phase II Final Report