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Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031004.
Published Online: July 14, 2011
... to the redesign of a single rotor row and two double-stage axial fans. The departure angles and work distributions in the inverse design were taken as design variables separately in optimizations of the single rotor and double-stage fans, and they were parametrically represented by means of Bézier curves, whose...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. March 2012, 134(2): 021009.
Published Online: June 23, 2011
...R. Srivastava; J. Panovsky; R. Kielb; L. Virgin; K. Ekici A new mechanism for fan stator vane failure in turbofan engines at high speed and high loading has been identified and reported in this paper. Highly destructive vane failures have been encountered at Honeywell in a development fan...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. January 2012, 134(1): 011002.
Published Online: May 24, 2011
... , R. , 2007 , “ Numerical Simulation of Counter-Rotating Fan Aeroacoustics ,” AIAA Paper No. 2007-3680. Stuermer , A. , and Yin , J. , 2009 , “ Low-Speed Aerodynamics and Aeroacoustics of CROR Propulsion Systems ,” AIAA Paper No. 2009-3134. Hanson , D. , and Parzych , D...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. October 2011, 133(4): 041029.
Published Online: April 27, 2011
...Mehdi Vahdati; George Simpson; Mehmet Imregun This paper describes a detailed wide-chord fan blade flutter analysis with emphasis on flutter bite. The same fan was used with three different intakes of increasing complexity to explain flutter mechanisms. Two types of flutter, namely, stall...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. October 2011, 133(4): 041024.
Published Online: April 26, 2011
... hole geometries: simple angled (axial angle of 30 deg) and compound angled (axial angle of 30 deg and compound angle of 45 deg) and cylindrical and fan-shaped film-cooling holes. Each plate considered has seven holes, each hole 4 mm in diameter. The plates with cylindrical holes have a spacing of 3...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. January 2011, 133(1): 011017.
Published Online: September 22, 2010
...Sébastien Lemire; Huu Duc Vo This paper proposes a new technique to reduce the noise generated by rotor-stator interaction (tonal noise) in fans and compressors. The method involves the use of single dielectric barrier discharge (plasma) actuators near the blade trailing edge to reduce blade wakes...
Journal Articles
Journal Articles
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. July 2010, 132(3): 031007.
Published Online: March 25, 2010
...Dilip Prasad; Wesley K. Lord The flow through a high-bypass ratio fan stage during engine-out conditions is investigated, with the objective of quantifying the internal losses when the rotor is at “windmill.” An analysis of altitude test data at various simulated flight Mach numbers shows...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. July 2010, 132(3): 031005.
Published Online: March 24, 2010
...Alessandro Corsini; Franco Rispoli; A. G. Sheard This paper reports on quantitative tests of passive techniques for rotor-tip noise control in low-speed axial flow fans, based on blade-tip modifications involving the addition of antivortex appendages as end-plates. The end-plate thickness chordwise...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. April 2010, 132(2): 021017.
Published Online: January 20, 2010
...Juan Du; Feng Lin; Hongwu Zhang; Jingyi Chen A numerical investigation on the self-induced unsteadiness in tip leakage flow is presented for a transonic fan rotor. NASA Rotor 67 is chosen as the computational model. It is found that under certain conditions the self-induced unsteadiness can...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. April 2010, 132(2): 021015.
Published Online: January 13, 2010
...Nobuyuki Yamaguchi; Masayuki Ogata; Yohei Kato An improved construction of air-separator device, which has radial-vanes embedded within its inlet circumferential opening with their leading-edges facing the moving tips of the fan rotor-blades so as to scoop the tip flow, was investigated...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. April 2010, 132(2): 021009.
Published Online: January 12, 2010
...Nobuyuki Yamaguchi; Masayuki Ogata; Yohei Kato The stall-prevention effect of air separators incorporating radial vanes in place of the existing axial vanes was investigated on a low-speed, single-stage, lightly loaded axial-flow fan for effective and compact air separators of a simplified...
Journal Articles
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. July 2009, 131(3): 031018.
Published Online: April 20, 2009
... to the design of a generic turbofan core compression system is introduced. It is shown that nearly one percentage point of the equivalent compressor adiabatic efficiency can be saved. 27 06 2008 25 07 2008 20 04 2009 aerodynamics compressors design engineering fans turbomachinery...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. October 2008, 130(4): 041020.
Published Online: August 4, 2008
...James S. Porter; Jane E. Sargison; Gregory J. Walker; Alan D. Henderson This study presents velocity and turbulence data measured experimentally in the near field of a round and a laterally expanded fan-shaped cooling hole. Both holes are fed by a plenum inlet, and interact with a turbulent...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. July 2008, 130(3): 031010.
Published Online: May 2, 2008
...A. R. Wadia; P. N. Szucs This paper reports on the numerical assessment of the differences in aerodynamic performance between part span shrouded and unshrouded fan blades generally found in the first stage of multistage fans in low bypass ratio aircraft engines. Rotor flow fields for both blade...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. July 2008, 130(3): 031001.
Published Online: April 1, 2008
...Markus Tremmel; Dale B. Taulbee Radial fans of the squirrel-cage type are used in various industrial applications. The analysis of such fans via computational fluid mechanics can provide the overall fan performance coefficients, as well as give insights into the detailed flow field. However...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Turbomach. April 2008, 130(2): 021004.
Published Online: February 12, 2008
...Jack L. Kerrebrock; Alan H. Epstein; Ali A. Merchant; Gerald R. Guenette; David Parker; Jean-Francois Onnee; Fritz Neumayer; John J. Adamczyk; Aamir Shabbir The design and test of a two-stage, vaneless, aspirated counter-rotating fan is presented in this paper. The fan nominal design objectives...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Turbomach. July 2007, 129(3): 479–487.
Published Online: July 23, 2006
..., will be quiet relative to current turbofans. To reduce the engine weight, a system with a gearbox, or some other form of shaft speed reduction device, is proposed. This is combined with a low-speed fan and a turbine with high gap-chord spacing to further reduce turbomachinery source noise. An engine...