A VTOL-UAV inlet flow distortion reduction concept using a new flow control approach: Double-ducted-fan (DDF)

Cengiz Camci, Ali Aktürk

Research output: Contribution to conferencePaper

1 Citation (Scopus)

Abstract

This paper briefly describes a novel ducted fan inlet flow-conditioning concept that will significantly improve the performance and controllability of ducted fans operating at high angle of attack. High angle of attack operation of ducted fans is very common in VTOL (vertical takeoff and landing) UAV systems. The new concept that will significantly reduce the inlet lip separation related performance penalties in the edgewise/forward flight zone is named DOUBLE-DUCTED FAN (DDF). The current concept uses a secondary stationary duct system to control inlet lip separation related momentum deficit at the inlet of the fan rotor occurring at elevated edgewise flight velocities. The DDF is self-adjusting in a wide edgewise flight velocity range and its corrective aerodynamic effect becomes more pronounced with increasing flight velocity due to its inherent design properties. In this manuscript, after a comprehensive discussion of VTOL inlet flow distortion issues, a conventional baseline duct without any lip separation control feature is compared to two different double-ducted fans named DDF CASE-A and DDF CASE-B via 3D, viscous and turbulent flow computational analysis. Both hover and edgewise flight conditions are considered. Significant relative improvements from DDF CASE-A and DDF CASE-B are in the areas of vertical force (thrust) enhancement, nose-up pitching moment control and recovery of fan through-flow mass flow rate in a wide horizontal flight range.

Original languageEnglish (US)
StatePublished - Jan 1 2019
Event16th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC 2016 - Honolulu, United States
Duration: Apr 10 2016Apr 15 2016

Conference

Conference16th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC 2016
CountryUnited States
CityHonolulu
Period4/10/164/15/16

Fingerprint

Inlet flow
Takeoff
Unmanned aerial vehicles (UAV)
Landing
Flow control
Fans
Angle of attack
Ducts
Viscous flow
Controllability
Turbulent flow
Aerodynamics
Momentum
Rotors
Flow rate

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

Camci, C., & Aktürk, A. (2019). A VTOL-UAV inlet flow distortion reduction concept using a new flow control approach: Double-ducted-fan (DDF). Paper presented at 16th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC 2016, Honolulu, United States.
Camci, Cengiz ; Aktürk, Ali. / A VTOL-UAV inlet flow distortion reduction concept using a new flow control approach : Double-ducted-fan (DDF). Paper presented at 16th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC 2016, Honolulu, United States.
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Camci, C & Aktürk, A 2019, 'A VTOL-UAV inlet flow distortion reduction concept using a new flow control approach: Double-ducted-fan (DDF)' Paper presented at 16th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC 2016, Honolulu, United States, 4/10/16 - 4/15/16, .

A VTOL-UAV inlet flow distortion reduction concept using a new flow control approach : Double-ducted-fan (DDF). / Camci, Cengiz; Aktürk, Ali.

2019. Paper presented at 16th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC 2016, Honolulu, United States.

Research output: Contribution to conferencePaper

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Camci C, Aktürk A. A VTOL-UAV inlet flow distortion reduction concept using a new flow control approach: Double-ducted-fan (DDF). 2019. Paper presented at 16th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC 2016, Honolulu, United States.