Compact apparatus for experimental characterization of UAV propeller generated internal flow

UAV motor-propeller propulsion suites combine the key merits of component tunability, high flow rate generation, and portable power sources. These advantages have the potential to benefit a broad range of devices that require active air flow under power constraints, especially those operating at static pressure conditions exceeding the capabilities of small axial case fans. However, the use of UAV motor-propellers for closed systems and internal air delivery remains understudied. In this work, we present a compact apparatus optimized for characterizing the performance of small UAV motor-propeller in generating internal flow under various pressure conditions. Compact sensors are integrated to probe both the static and dynamic characteristics of the internal air flow. We also discuss a framework of theoretical calculations and CFD simulations used to both guide the design and validate the measurements of our proposed setup. Finally, our experimental results demonstrate that a small quadrotor motor and propeller can deliver close to 25 L/s while overcoming static pressure drop of over 70 Pa. These metrics match the challenging conditions imposed by complex interior airways. Overall, this work encompasses a holistic effort in understanding and harnessing the superior aerodynamic performance of UAV propellers for internal flow generation.