.... In Part II, five cases of geometry with different axial distances between the swirl breaker and the rotor shroud, which covered a range for the stage axial distance of actual high and intermediate pressure (HIP) steam turbines, were investigated using a single-rotor computational fluid dynamics (CFD...

... aerodynamic loss due to mixing with the mainstream flow. In order to reduce this mixing loss, two distinct ideas for rotor shroud exit cavity geometries were investigated using computational fluid dynamics (CFD) analyses and experimental tests. One idea was an axial fin placed from the shroud downstream...

...Bradley R. Nichols; Roger L. Fittro; Christopher P. Goyne Reduced oil supply flow rates in fluid film bearings can cause cavitation, or lack of a fully developed hydrodynamic film layer, at the leading edge of the bearing pads. Reduced oil flow has the well-documented effects of higher bearing...

.... , 2016 , “ A Numerical Study of Francis Turbine Operation at No-Load Condition ,” ASME J. Fluids Eng. , 139 ( 1 ), p. 011104 . 10.1115/1.4034422 [22] Mende , C. , Weber , W. , and Seidel , U. , 2016 , “ Progress in Load Prediction for Speed-No-Load Operation in Francis Turbines...

.... , 31 ( 1 ), pp. 35 – 41 . https://www.energy.siemens.com/hq/pool/hq/energy-topics/technical-papers/Fast%20cycling%20and%20rapid%20start-up.pdf [2] Cohen , L. S. , and Hanratty , T. J. , 1968 , “ Effect of Waves at a Gas-Liquid Interface on a Turbulent Air Flow ,” J. Fluid Mech. , 31...

... Combustion Cooling Environmental Experimental Fluids Fossil power generation Fuel combustion Fuels Gas turbine technology Gaseous Heat transfer Mass Transfer Mixed Process Natural gas technology Packed Beds Participating Media Phase change Power systems Reliability Coupled behavior...

... to measure inlet pressure, outlet pressure, rotational speed, and barrier fluid flow rate acquiring flow-head characteristic curves. Moreover, empirical generalized characteristic curves are deduced from experimental observations obtained from the present study and previous companion work. The generalized...

... fluids and for seals with complex geometries. This results in much uncertainty in the estimation of the dynamic seal forces, which often leads to unexpected system behavior. This paper presents the results of a method suitable for on-site identification of uncertain dynamic annular seal forces...

... glycol (PAG) oil with low concentration of CO 2 (<30%). A three-dimensional (3D) computational fluid dynamic (CFD) model of the bearing was developed and validated against the experimental data. The mixture composition and the resultant mixture viscosity were calculated as a function of pressure...

... external journal bearing oil flow, an approach to decompose an actual journal bearing into simplified models is proposed. Preliminary modeling considerations are discussed. The findings and conclusions are used to create a three-dimensional (3D), two-component computational fluid dynamics (CFD) sector...

.... The curvature of the housing is varied in the Y–Z plane until rub or close-to-wall rub is expected. The curvature needed for a rub with a 1X 1cP fluid is 7.5 deg of curvature. Curvature has little impact on stability. With both 1X 30cP and 3X 30cP, the maximum curvature for a static rub is over 25 deg...

... (FFS) and Rayleigh step designs are known to produce positive fluid stiffness. However, there is very limited modeling or experimental data available on the hydrostatic fluid forces generated from either design. A quasi-one-dimensional (1D) method has been developed to describe both designs...

... as possible. However, setting the scavenge ratio to one may risk flooding as air bubbles in the fluid are inevitable. Therefore, the scavenge ratio is always set to higher than one (scavenge ratio of four is a typical value for an aero-engine at cruise). With increased scavenge ratio, more air is ingested...

... of attack. Regions were defined on suction-side x-pressure force plots using the validated computational fluid dynamics (CFD) data-set that showed where and how much drag could be reduced. At 20 deg angle of attack, there was a potential to reduce up to 20% drag contained within the separated flow region...

... OWER . Manuscript received August 24, 2016; final manuscript received July 17, 2017; published online October 3, 2017. Assoc. Editor: Stani Bohac. 24 08 2016 17 07 2017 Design optimization Engines Fluids China has been the world's largest light duty engine market since...

... AS T URBINES AND P OWER . Manuscript received July 7, 2017; final manuscript received July 12, 2017; published online October 3, 2017. Editor: David Wisler. 07 07 2017 12 07 2017 Burners Combustion Combustors Experimental Flame Fluids Fuels Gas turbine technology Jets...

... Fluidmechanische Untersuchung Eines Zwei- Phasen-Ejektors Fuer Flugtriebwerke ” Diploma Thesis (Design and Fluid Mechanical Investigation of a Two-Phase Flow Ejector for Aero Engines), Lehrstuhl Fuer Thermodynamik (Department of Thermo-Dynamics), Munich Technical University, Munich, Germany. [14] Menter , F...

... of the difficulties in the multiple injections is to control fuel-spray behaviors during opening and closing of valve; flow rate and spray penetration which are changed due to slow velocity of fluid during opening and closing of valve cause nonuniformity of air/fuel mixture that results in the increase of PM. Fuel...

... load and fluid stiffness. In this study, two groove types are investigated—Rayleigh step and inclined groove. The study uses a design of experiments approach and a Reynolds equation solver to explore the design space. Key parameters have been identified that can be used to optimize a seal design...

... NGINEERING FOR G AS T URBINES AND P OWER . Manuscript received October 7, 2016; final manuscript received December 29, 2016; published online March 28, 2017. Editor: David Wisler. 07 10 2016 29 12 2016 Aeronautical propulsion Computational fluid dynamics Engines Fluids Gas turbine...