Tip clearance investigation of a ducted fan used in VTOL UAVs part 1: Baseline experiments and computational validation

Ali Akturk, Cengiz Camci

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Scopus citations

Abstract

Ducted fans that are popular choices in vertical take-off and landing (VTOL) unmanned aerial vehicles (UAV) offer a higher static thrust/power ratio for a given diameter than open propellers. Although ducted fans provide high performance in many VTOL applications, there are still unresolved problems associated with these systems. Fan rotor tip leakage flow is a significant source of aerodynamic loss for ducted fan VTOL UAVs and adversely affects the general aerodynamic performance of these vehicles. The present study utilized experimental and computational techniques in a 22" diameter ducted fan test system that has been custom designed and manufactured. Experimental investigation consisted of total pressure measurements using Kiel total pressure probes and real time six-component force and torque measurements. The computational technique used in this study included a 3D Reynolds-Averaged Navier Stokes (RANS) based CFD model of the ducted fan test system. RANS simulations of the flow around rotor blades and duct geometry in the rotating frame of reference provided a comprehensive description of the tip leakage and passage flow. The experimental and computational analysis performed for various tip clearances were utilized in understanding the effect of the tip leakage flow on aerodynamic performance of ducted fans used in VTOL UAVs. The aerodynamic measurements and results of the RANS simulations showed good agreement especially near the tip region.

Original languageEnglish (US)
Title of host publicationASME 2011 Turbo Expo
Subtitle of host publicationTurbine Technical Conference and Exposition, GT2011
Pages331-344
Number of pages14
EditionPARTS A, B, AND C
DOIs
StatePublished - Dec 1 2011
EventASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, GT2011 - Vancouver, BC, Canada
Duration: Jun 6 2011Jun 10 2011

Publication series

NameProceedings of the ASME Turbo Expo
NumberPARTS A, B, AND C
Volume7

Other

OtherASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, GT2011
CountryCanada
CityVancouver, BC
Period6/6/116/10/11

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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    Akturk, A., & Camci, C. (2011). Tip clearance investigation of a ducted fan used in VTOL UAVs part 1: Baseline experiments and computational validation. In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, GT2011 (PARTS A, B, AND C ed., pp. 331-344). (Proceedings of the ASME Turbo Expo; Vol. 7, No. PARTS A, B, AND C). https://doi.org/10.1115/GT2011-46356