.... 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...

.... 16 . Unlike the measured fluctuating pressure, LES shows periodic fluctuations of the pressure. In the numerical analysis, noise, system vibration, and the fluid structure interaction are not present; therefore, LES shows a more accurate sinusoidal pattern of the corresponding frequencies than...

... NGINEERING FOR G AS T URBINES AND P OWER . Manuscript received September 14, 2017; final manuscript received October 22, 2017; published online June 25, 2018. Editor: David Wisler. 14 09 2017 22 10 2017 Aerodynamics Droplet Engines Film Fluids Fouling Friction Multiphase flows...

... and NO concentration in the CO 2 turbine exhaust gas) is the contacting time of the working fluid and cooling water within the DCC. Liquid residence time and vapor–liquid contact time can be controlled by variable speed control on an external pump-around or by holdups within the contacting media, as well as column...

... 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...

..., 2017. Assoc. Editor: Klaus Brun. 30 05 2017 10 07 2017 Aeronautical propulsion Aerospace applications Design optimization Droplet Experimental Film Fluids Gas turbine technology Multiphase flows Separated Shear Flows Turbulent Two-phase Unsteady Aerospace Propulsion...

... 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...

... Burners Combustion Combustors Experimental Flame Fluids Fuels Gas turbine technology Jets Multiphase flows Nonintrusive diagnostics Sprays Swirling Thermodynamics Turbulence Turbulent Two-phase Vaporization Visualization Combustion Ignition in aeronautical engines is a vital...

... and the reliability against mechanical failure should also be taken into account. In order to enable ejector design, one-dimensional tools were created. For ejectors using an incompressible fluid as primary medium, the method described in Refs. [ 1 ] and [ 2 ] is recommended. For compressible primary media...

... 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...

... for Fixed-Exit Exhaust Nozzles ,” AIAA Paper No. 97-3148. 10.2514/6.1997-3148 [7] Tian , C. , and Lu , Y. , 2013 , “ Turbulence Models of Separated Flow in Shockwave Thrust Vector Nozzle ,” Eng. Appl. Comput. Fluid Mech. , 7 ( 2 ), pp. 182 – 192 . 10.1080/19942060.2013.11015463 [8...