Viability of Cross-Flow Fan with Helical Blades for Vertical Take-off and Landing Aircraft
Kwek, Howe Leng
Hobson, Garth V.
Gannon, Anthony J.
MetadataShow full item record
The cross-flow fan (CFF) is a lifting and propulsion device that retains the advantages of a fixed-wing aircraft by using a ducted lift fan. There is no upper limit to the rotor length-to-diameter ratio of a CFF, allowing the device to be installed along the length of the wing or lifting device. The CFF discharged vector can be easily rotated about the fan axis since the fan has no angular requirements, further allowing the capability of vertical take-off and landing (VTOL) by thrust vectoring. CFF possess the potential to propel an airframe to flight; however adequate thrust must be produced by the CFF in order for it to realize VTOL. Conventional CFFs designs with straight blades produce unacceptable noise levels for personal air vehicle operation. It is believed that helical blades could solve the sound pressure level problem and produce more thrust to aid VTOL. Using computational fluid dynamics (CFD) software, ANSYS-CFX, a three-dimensional (3-D) straight-bladed model was validated against previous studys experimental results. A 3-D model with helical blades was constructed to investigate the performance. The analytical results have shown that helical blades could increase the thrust performance of a CFF, and could possibly realize VTOL.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. As such, it is in the public domain, and under the provisions of Title 17, United States Code, Section 105, is not copyrighted in the U.S.
Showing items related by title, author, creator and subject.
Waterman, Timothy J. (Monterey, California: Naval Postgraduate School, 2016-06);This study determined the optimum blade stagger angle for a cross-flow fan rotor and evaluated the performance of a 3D printed rotor. Using ANSYS-CFX and SolidWorks, the cross-flow fan was modeled computationally and tested ...
Martin, Michael J. (Monterey, California: Naval Postgraduate School, 2013-06);This study determined the optimum number of blades on a 4-inch diameter cross-flow fan rotor such that the rotor produced a thrust-to-weight ratio over one, which will make vertical take-off possible. The commercial ...
Givens, Todd Williams; LeMoine, John A. (Monterey, California. Naval Postgraduate School, 1984-12); NPS67-84-019The most accurate method for measuring turbojet/turbofan thrust is mechanical. A more practical method is often desired , however, since a mechanical device is costly and non-portable. An investigation was conducted ...