**Nomenclature**

This ratio is precisely the inverse of this presented in **Figure 15** and it represents

The Mars 2020 rover aerodynamics plays a fundamental role in the operation of rover wind sensors. A set of hot film sensors have been specially designed to be installed over two booms located perpendicular to camera mast of rover. This kind of sensors are based on the heat transfer from sensors to environment around the

Reynolds number is the fundamental parameter to establish the physical similarity

Finally, the calibration factor equation was indicated as the main way to correct flow velocity from the adverse effects produced by the rover vehicle over wind

This investigation was funded by Spanish Ministry of Defense under the program "IGB 99001 Termofluidodinámica" of INTA (National Institute for Aerospace

between real flow in Mars and this investigated in Earth by wind tunnel testing. Potential flow provides a first approximation to study the longitudinal and transversal flows over booms where wind sensors will be installed. Limitations of the potential model are evidenced by detachment flow in the wake of booms with transversal flow and the presence of the boundary layer where viscous effects are of the same order of inertial effects. Due to these limitations, a more intensive experimental investigation is necessary. Global information about the flow pattern around the rover vehicle was obtained by smoke visualization. Qualitative techniques as Particle Image Velocimetry (PIV) and Laser Doppler Anemometry (LDA) were used to get insight about the velocity field. The effects of rover vehicle over the flow coming to the sensors booms were studied, and not valid regions of each

sensors, but physical properties of Earth atmosphere are very different to these present in Mars atmosphere where sensors will operate during Mars 2020

the effect of rover vehicle over the booms.

*Forbidden circular sectors for wind sensors measurements.*

*Mars Exploration - A Step Forward*

**8. Conclusions**

**Figure 16.**

mission.

sensor were determined.

sensors measurements.

**Acknowledgements**

Technology of Spain).

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