Journal of Turbomachinery: Recent submissions
Now showing items 801-820 of 4519
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Flow in a Simulated Turbine Blade Cooling Channel With Spatially Varying Roughness Caused by Additive Manufacturing Orientation
(The American Society of Mechanical Engineers (ASME), 2021)Because of the effects of gravity acting on the melt region created during the laser sintering process, additively manufactured surfaces that are pointed upward have been shown to exhibit roughness characteristics different ... -
Experimental and Computational Analysis of Additive Manufactured Augmented Backside Liner Cooling Surfaces for Use in Micro-Gas Turbines
(The American Society of Mechanical Engineers (ASME), 2021)Augmented backside cooling refers to the enhancement of the backside convection of a combustor liner using extended heat transfer surfaces to fully utilize the cooling air by maximizing the heat transfer to pumping ratio ... -
The Effect of Blade Count on Body Force Model Performance for Axial Fans
(The American Society of Mechanical Engineers (ASME), 2021)Body force models enable inexpensive numerical simulations of turbomachinery. The approach replaces the blades with sources of momentum/energy. Such models capture a “smeared out” version of the blades’ effect on the flow, ... -
Single and Multiple Circumferential Casing Groove for Stall Margin Improvement in a Transonic Axial Compressor
(The American Society of Mechanical Engineers (ASME), 2021)The stability limit of a tip-stalling axial compressor is sensitive to the magnitude of the near-casing blockage. In transonic compressors, the presence of the passage shock could be a major cause for the blockage. ... -
Experimental Study of Outflow Effects in a Rotating Turbulated Channel
(The American Society of Mechanical Engineers (ASME), 2021)The three-pass turbulated serpentine channel has many applications in internal turbine blade systems. However, the studies on the effects of the outflow ratio are lacking, which decreases the thermal analysis accuracy in ... -
Design, Testing, and Performance Impact of Exhaust Diffusers in Aero-Derivative Gas Turbines for Mechanical Drive Applications
(The American Society of Mechanical Engineers (ASME), 2021)The growing penetration of renewables calls for power generation and mechanical drive gas turbine (GT) capable of quickly adjusting production and operate at part load. Aero-derivative engine architectures leverage the ... -
Super Aggressive S-Ducts for Air Breathing Rocket Engines
(The American Society of Mechanical Engineers (ASME), 2021)Air breathing rocket engines require turbomachinery and ducting that is substantially lighter than that used in ground-based or aerospace gas turbines. In order to reduce the weight of the axial compressor, the design of ... -
Experiment-Based Preliminary Design Guidelines for Consideration of Profile Vortex Shedding From Low-Speed Axial Fan Blades
(The American Society of Mechanical Engineers (ASME), 2021)This paper presents hot-wire measurements in a wind tunnel, close downstream of basic models of blade sections being representative for low-speed, low-Reynolds number axial fans, in order to explore the signatures of vortex ... -
Effect of Surface Roughness and Inlet Turbulence Intensity on a Turbine Nozzle Guide Vane External Heat Transfer: Experimental Investigation on a Literature Test Case
(The American Society of Mechanical Engineers (ASME), 2021)Surface roughness is well known to significantly influence turbine aerodynamics and heat transfer; different studies have been undertaken in the last decades, in order to precisely characterize its effects and pursue a ... -
Scalar Diffusion Equation-Based Model to Predict 2-Dimensional Film Cooling Effectiveness of a Shaped Hole
(The American Society of Mechanical Engineers (ASME), 2021)One-dimensional laterally averaged adiabatic film cooling effectiveness η¯lat-based correlations have been widely employed in the cooling design of the modern gas turbine and aero-engine; however, the flow field of the ... -
The Effect of Thermal Barrier Coating Surface Temperature on the Adhesion Behavior of CMAS Deposits
(The American Society of Mechanical Engineers (ASME), 2021)The interaction of thermal barrier coating’s surface temperature with calcium magnesium aluminosilicate (CMAS) like deposits in gas turbine hot flowpath hardware is investigated. Small Hastelloy X coupons were coated in ... -
Effects of Attack Angle and Relative Thickness of Novel Wing-Shaped Turbulators on Turbulent Hydrothermal Performance in a Two-Pass Square Channel
(The American Society of Mechanical Engineers (ASME), 2021)This work aims to combine the effects of the near-wall and core flow disturbance by proposing novel wing-shaped turbulators. The new turbulators are fabricated with the fused deposition modeling (3D printing) technology. ... -
Numerical Assessment of Density Ratio and Mainstream Turbulence Effects on Leading-Edge Film Cooling: Heat and Mass Transfer Methods
(The American Society of Mechanical Engineers (ASME), 2021)Within the context of leading-edge film cooling in a high-pressure turbine vane, the present study is a step forward toward modeling showerhead performance for a baseline geometry (namely four staggered rows of cylindrical ... -
The Effects of Reynolds Number on the Stall and Pre-Stall Behavior of Compact Axial Compressors
(The American Society of Mechanical Engineers (ASME), 2021)Compact axial compression systems are of interest to the domestic appliance industry. The associated low Reynolds number leads to high losses compared to large-scale compressors due to a transitional flow field with large ... -
Metamodel-Driven Data Mining Model to Support Three-Dimensional Design of Centrifugal Compressor Stage
(The American Society of Mechanical Engineers (ASME), 2021)The advanced design of a centrifugal compressor with high efficiency and wide operating range is a challenging task due to the complex flow field arising from the three-dimensional geometry, especially for the high-speed, ... -
Analysis of Transonic Bladerows With Non-Uniform Geometry Using the Spectral Method
(The American Society of Mechanical Engineers (ASME), 2021)Turbomachinery blade rows can have non-uniform geometries due to design intent, manufacture errors or wear. When predictions are sought for the effect of such non-uniformities, it is generally the case that whole assembly ... -
Aero-Thermal Aspects of Film Cooled Nozzle Guide Vane Endwall—Part 2: Thermal Measurements
(The American Society of Mechanical Engineers (ASME), 2021)Flow over gas turbine endwalls is complex and highly three-dimensional. As boundaries for modern engine designs are pushed, this already-complex flow is affected by aggressive application of film cooling flows that actively ... -
Aero-Thermal Aspects of Film Cooled Nozzle Guide Vane Endwall—Part 1: Aerodynamics
(The American Society of Mechanical Engineers (ASME), 2021)The first-stage turbine of a modern gas turbine is subjected to high thermal loads which lead to a need for aggressive cooling schemes to protect its components from melting. Endwalls are particularly challenging to cool ... -
Non-Dimensional Parameters for Comparing Conventional and Counter-Rotating Turbomachines
(The American Society of Mechanical Engineers (ASME), 2021)Counter-rotating turbomachines have the potential to be high efficiency, high power density devices. Comparisons between conventional and counter-rotating turbomachines in the literature make multiple and often contradicting ... -
A Comparison of Volume of Fluid and Euler–Euler Approaches in Computational Fluid Dynamics Modeling of Two-Phase Flows With a Sharp Interface
(The American Society of Mechanical Engineers (ASME), 2021)In aero-engines, it is important to predict the behavior of shear flows in the different parts such as bearing chambers or gearboxes. In bearing chambers, the thickness distribution of wavy films is well studied as two-phase ...