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Keywords: engines
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Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041015.
Published Online: July 21, 2011
... to diameter ratio. All tests have been performed over a wide range of engine typical blowing ratios ( M = 0.5 – 3.0 ) . The hot gas Reynolds number and the coolant to hot gas density ratio have been kept constant close to engine realistic conditions. The results, presented in terms of contour plots of related...
Journal Articles
Article Type: Research Papers
J. Turbomach. July 2012, 134(4): 041008.
Published Online: July 20, 2011
...Yogi Sheoran; Bruce Bouldin; P. Murali Krishnan Inlet swirl distortion has become a major area of concern in the gas turbine engine community. Gas turbine engines are increasingly installed with more complicated and tortuous inlet systems such as those found on embedded installations on unmanned...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031011.
Published Online: July 15, 2011
... input conditions are well documented and do not produce large changes in the heat-flux. It provides insight into the flow physics of an actual engine and guidelines about proper normalization of variables for a cooled turbine stage, supporting further development of computational heat-flux modeling...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031013.
Published Online: July 15, 2011
... asymptote is quantified, and it is suggested how the orifice model could be used to extrapolate the effectiveness data obtained from an experimental rig to engine-operating conditions. 14 07 2010 22 07 2010 15 07 2011 15 07 2011 engines orifices (mechanical) swirling flow...
Journal Articles
Article Type: Research Papers
J. Turbomach. May 2012, 134(3): 031006.
Published Online: July 14, 2011
...Diganta P. Narzary; Kuo-Chun Liu; Akhilesh P. Rallabandi; Je-Chin Han Adiabatic film-cooling effectiveness is examined on a high-pressure turbine blade by varying three critical engine parameters, viz., coolant blowing ratio, coolant-to-mainstream density ratio, and freestream turbulence intensity...
Journal Articles
Article Type: Research Papers
J. Turbomach. March 2012, 134(2): 021022.
Published Online: June 30, 2011
... deficit attributable to unequal admission, the steady flow conditions introduced in one inlet were varied with respect to the other. The results from these tests were then compared with unsteady, in-phase and out-of-phase pulsed flows most representative of the actual engine operating condition...
Journal Articles
Article Type: Research Papers
J. Turbomach. March 2012, 134(2): 021014.
Published Online: June 28, 2011
... and a reference new vane were made. Coordinates for the three airfoil profiles were obtained from the nozzle guide vanes of refurbished turboshaft engines using 3D optical scanning and digital modeling. The repaired profiles showed differences in geometry in comparison with the new vane, particularly near...
Journal Articles
Article Type: Research Papers
J. Turbomach. March 2012, 134(2): 021007.
Published Online: June 22, 2011
... have historically been predicted by correlations based on global flow parameters, such as blade loading, inlet boundary layer skew, etc., and thus ignoring small deviations such as those highlighted above. In this paper it is shown that this may not be the case and that certain, engine representative...
Journal Articles
Article Type: Research Papers
J. Turbomach. March 2012, 134(2): 021001.
Published Online: June 21, 2011
...Md. Hamidur Rahman; Sung In Kim; Ibrahim Hassan High thermal load appears at the blade tip and casing of a gas turbine engine. It becomes a significant design challenge to protect the turbine materials from this severe situation. As a result of geometric complexity and experimental limitations...
Journal Articles
Article Type: Research Papers
J. Turbomach. January 2012, 134(1): 011016.
Published Online: May 27, 2011
... of an operational engine as it is reproduced in a laboratory setting. The experiment upon which these computations are based includes realistic complications such as one-dimensional and two-dimensional inlet temperature profiles, a heavily film-cooled vane, and purge cooling. While the ultimate goal...
Journal Articles
Article Type: Research Papers
J. Turbomach. January 2012, 134(1): 011006.
Published Online: May 25, 2011
...R. M. Mathison; C. W. Haldeman; M. G. Dunn As controlled laboratory experiments using full-stage turbines are expanded to replicate more of the complicated flow features associated with real engines, it is important to understand the influence of the vane inlet temperature profile on the high...
Journal Articles
Article Type: Research Papers
J. Turbomach. October 2011, 133(4): 041022.
Published Online: April 26, 2011
...Michela Massini; Robert J. Miller; Howard P. Hodson This paper presents the design, manufacture, and testing of a new probe for the measurement of temperature and pressure in engine environments. The probe consists of a choked nozzle located in the flow and a system downstream including a cooler...
Journal Articles
Article Type: Research Papers
J. Turbomach. October 2011, 133(4): 041023.
Published Online: April 26, 2011
... 2011 cooling engines gas turbines jets painting turbulence velocimeters As the demand for power continues to rise around the world, gas turbine engines are required to ease this demand as efficiently as possible. To meet the growing demand for power, the turbine inlet temperatures...
Journal Articles
Article Type: Research Papers
J. Turbomach. October 2011, 133(4): 041026.
Published Online: April 26, 2011
..., the thermal-mechanical constraints on increasing the rotational speed of shrouded blades have driven the desire of many engine manufacturers to move to using unshrouded blades. However, unshrouded blades require a tip clearance to avoid striking the casing. The overtip leakage (OTL) flow has high velocity...
Journal Articles
Article Type: Research Papers
J. Turbomach. October 2011, 133(4): 041006.
Published Online: April 20, 2011
... edge model in an atmospheric open loop wind tunnel, which has been used in several earlier studies. An infrared thermographic measurement technique is employed, which allows for the application of engine-realistic density ratios around 1.6 by increasing the main flow temperature. The effects...
Journal Articles
Article Type: Research Papers
J. Turbomach. April 2011, 133(2): 021019.
Published Online: October 25, 2010
... and Reynolds numbers at engine relevant levels and of coolant mass flows. The results for steady and periodic unsteady inflows with highly turbulent wakes created by cylindrical bars moving upstream in a plane parallel to the cascade are compared as two-dimensional surface plots, laterally averaged film...
Journal Articles
Article Type: Research Papers
J. Turbomach. April 2011, 133(2): 021020.
Published Online: October 25, 2010
...Riccardo Da Soghe; Bruno Facchini; Luca Innocenti; Mirko Micio Reliable design of a secondary air system is one of the main tasks for the safety and unfailing performance of gas turbine engines. To meet the increasing demands of gas turbine designs, improved tools in the prediction of secondary air...
Journal Articles
Article Type: Research Papers
J. Turbomach. April 2011, 133(2): 021012.
Published Online: October 21, 2010
... of the approach, a transient computational fluid mechanics analysis is performed based on the compressible inviscid Euler equations covering an entire engine cycle. The resulting harmonic orders of aerodynamic excitation are imposed in a forced response analysis of the respective eigenvector to determine...
Journal Articles
Article Type: Research Papers
J. Turbomach. January 2011, 133(1): 011024.
Published Online: September 24, 2010
...Satoshi Hada; Karen A. Thole Turbines are designed to operate with high inlet temperatures to improve engine performance. To reduce NO x resulting from combustion, designs for combustors attempt to achieve flat pattern factors that results in high levels of heat transfer to the endwall of the first...
Journal Articles
Article Type: Research Papers
J. Turbomach. January 2011, 133(1): 011019.
Published Online: September 23, 2010
... the moderate amount of three-dimensionality did not affect the camera focus. 06 07 2009 25 07 2009 23 09 2010 23 09 2010 blades engines flow visualisation gas turbines heat transfer vortices A fundamental issue in the design of gas turbine engines is the detrimental...