Experimental and computational analysis of microscale shrouded coaxial rotor in hover

Han, Han; Chen, Xiang; Xu, Bugong; Yu, Yifeng

doi:10.1109/icuas.2017.7991413

Cited by 9 publications

(14 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are a variety of SR vehicles 10,11,[38][39][40][41] developed successfully in the laboratory. In our past work, 10 the test model is mounted vertically and reversely on a test bench (0.3 m 3 0.3 m 3 1.2 m) so that the air flows from bottom to top. In this work, a horizontal installation method that the rotational axis is fixed horizontally is shown in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

“…44 Therefore, the twisted blades with non-uniform chord are necessarily applied in the experiment. The past study 10 shows that large screw pitch is suitable for SR. Figure 3 illustrates the schematic of the experimental measurement system which includes the force and moment measurement system, the rotary speed measurement system, and the electric parameter measurement system. The force and moment measurement system is employed to measure the thrust and the torque of the rotor (T r , Q r ), and the thrust of the shroud (T s = T s1 +T s2 ).…”

Section: Sr Modelmentioning

confidence: 99%

“…The general thrust is then given in equation (12). It should be noted that equations (10)- (12) are true only for a onedimensional steady flow, and all terms related to the pressure forces are neglected in equation (10). Moreover, the recirculation around the shroud (close to a ground or a wall) will produce a shear stress that is not considered in equation 11T…”

Section: Ceiling Effectsmentioning

confidence: 99%

“…Compared with traditional rotorcrafts, shrouded rotor (SR) aircrafts have some advantages, for example, high maneuverability, low noise, and producing more thrust than open rotor (OR) at the same size and power consumption. [8][9][10] In addition, relative to OR, SR considerably decreases the safety area 11 required for flight so that SR can hover in closer proximity than OR to confined conditions. Furthermore, as an aerial manipulator, [12][13][14] SR aircrafts equipped with robotic arms can carry out operations in close proximity to objects.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Aerodynamic performance and analysis of a hovering micro-scale shrouded rotor in confined environment

Han

Chen

et al. 2019

Advances in Mechanical Engineering

Self Cite

View full text Add to dashboard Cite

The aerodynamic characteristics of open rotor hovering in confined environment are extensively studied, but few papers focus on shrouded rotor. In order to study aerodynamic performance and flowfield characteristics of micro-scale shrouded rotor hovering in confined environment, experimental measurements and computational fluid dynamic simulations are conducted in this article. Three cases of confined planes including ground, ceiling, and wall close to shrouded rotor are studied successively. Another case of no confined planes around shrouded rotor is also researched. Results show that both ground and ceiling improve the aerodynamic performance of shrouded rotor at distance below 1.5 rotor radii with the enhanced figure of merit, while wall plane influences flight stability because of the unbalanced moment. The experimental data reveal that the performance of shrouded rotor in-ground effect is more sensitive than that of shrouded rotor in-ceiling effect. However, for in-ground effect or in-ceiling effect, the performance of shrouded rotor is more sensitive than that of open rotor. Flowfield analysis by computational fluid dynamic shows the confined planes block airflow around shrouded rotor. Tip flow leakage and flow separation occur near shroud lip when shrouded rotor is hovering considerably close to ground or ceiling. Turbulent vortices and fluctuating velocities affect the flight stability of shrouded rotor.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Sr Modelmentioning

confidence: 99%

Section: Ceiling Effectsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Aerodynamic performance and analysis of a hovering micro-scale shrouded rotor in confined environment

Han

Chen

et al. 2019

Advances in Mechanical Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…Moreover, the total thrust of the counter-rotating ducted fan was significantly affected by the tip clearance of the rear rotor. Han et al [18] conducted experiments and simulations to investigate the aerodynamic performances of a counter-rotating fan with and without ducts for different blade pitch angles, rotor spacings, and tip clearances in hover mode. The results showed that the counter-rotating fan with a duct generated more thrust than the open counter-rotating fan because of the negative pressure region around the duct's leading edge created by the duct.…”

Section: Introductionmentioning

confidence: 99%

Effect of Rotor Spacing and Duct Diffusion Angle on the Aerodynamic Performances of a Counter-Rotating Ducted Fan in Hover Mode

2020

View full text Add to dashboard Cite

The aerodynamic performance of a counter-rotating ducted fan in hover mode is numerically analyzed for different rotor spacings and duct diffusion angles. The design of the counter-rotating fan is inspired by a custom-designed single rotor ducted fan used in a previous study. The numerical model to predict the aerodynamic performance of the counter-rotating ducted fan is developed by adopting the frozen rotor approach for steady-state incompressible flow conditions. The relative angle between the front and the rear rotor is examined due to the usage of the frozen rotor model. The results show that the variation of thrust for the different relative angles is extremely low. The aerodynamic performances are evaluated by comparing the thrust, thrust coefficient, power coefficient, and figure of merit (FOM). The thrust, thrust coefficient, and FOM slightly increase with increasing rotor spacing up to 200 mm, regardless of the duct diffusion angle, and reduce on further increase in the rotor spacing. The duct diffusion angle of 0° generates about 9% higher thrust and increases the FOM by 6.7%, compared with the 6° duct diffusion angle. The duct diffusion angle is highly effective in improving the thrust and FOM of the counter-rotating ducted fan, rather than the rotor spacing.

show abstract

Improving the performance of ducted fans for VTOL applications: A review

Qian

Luo

et al. 2022

Sci. China Technol. Sci.

View full text Add to dashboard Cite

Experimental and computational analysis of microscale shrouded coaxial rotor in hover

Cited by 9 publications

References 20 publications

Aerodynamic performance and analysis of a hovering micro-scale shrouded rotor in confined environment

Aerodynamic performance and analysis of a hovering micro-scale shrouded rotor in confined environment

Effect of Rotor Spacing and Duct Diffusion Angle on the Aerodynamic Performances of a Counter-Rotating Ducted Fan in Hover Mode

Improving the performance of ducted fans for VTOL applications: A review

Contact Info

Product

Resources

About