Journal of Engineering for Gas Turbines and Power: Recent submissions
Now showing items 2001-2020 of 9564
-
Influence of Turbocharger Turbine Blade Geometry on Vibratory Blade Stresses
(The American Society of Mechanical Engineers (ASME), 2019)In this paper, a method to influence the vibratory blade stresses of mixed flow turbocharger turbine blade by varying the local blade thickness in spanwise direction is presented. Such variations have an influence on both ... -
Effects of Control Valve's Structure Parameters on the Circulation Characteristics for an Electronic Unit Pump
(The American Society of Mechanical Engineers (ASME), 2019)The control valve is an essential component of electronic unit pump (EUP) fuel injection systems; it controls the flow rate with high-precision electrical signals. Thus, high precision and flexibility are required in the ... -
The Sensitivity of Inner Nozzle Flow in Gasoline Direct Injection Injector to the Nozzle Geometry Parameters
(The American Society of Mechanical Engineers (ASME), 2019)The inner-flow of gasoline direct injection (GDI) injector nozzles plays an important role in the process of spray, and affects the mixture process in gasoline engine cylinder. The nozzle structure also affects the inner-flow ... -
Blackbox Optimization for Aircraft Engine Blades With Contact Interfaces
(The American Society of Mechanical Engineers (ASME), 2019)In modern aircraft engines, reduced operating clearances between rotating blade tips and the surrounding casing increase the risk of blade/casing structural contacts, which may lead to high blade vibration levels. Therefore, ... -
Process Optimization of Wire-Based Laser Metal Deposition of Titanium
(The American Society of Mechanical Engineers (ASME), 2019)Titanium alloys are used instead of steel and nickel-based alloys to lower the weight of turbines whenever it is applicable. Due to the high manufacturing costs of titanium, near-net-shape processes like laser metal ... -
A Method and Apparatus for Direct Enthalpy Rise Measurement for Gas Compression
(The American Society of Mechanical Engineers (ASME), 2019)Gas property prediction is necessary for proper design of compressors. Equations of state are utilized to predict the thermo-physical gas properties needed for such calculations. These are semi-empirical models that allow ... -
The Impact of Inlet Distortion and Reduced Frequency on the Performance of Centrifugal Compressors
(The American Society of Mechanical Engineers (ASME), 2019)This paper discusses the impact of inlet flow distortions on centrifugal compressors based upon a large experimental data base in which the performance of several impellers in a range of corrected flows and corrected speeds ... -
Measurements Versus Predictions for a Hybrid (Hydrostatic Plus Hydrodynamic) Thrust Bearing for a Range of Orifice Diameters
(The American Society of Mechanical Engineers (ASME), 2019)A fixed-geometry hybrid thrust bearing is investigated with three different supply orifice diameters, (1.63, 1.80, and 1.93 mm). The test rig uses a face-to-face thrust-bearing design, with the test bearing acting as the ... -
A Method for Matching Two-Stage Turbocharger System and Its Influence on Engine Performance
(The American Society of Mechanical Engineers (ASME), 2019)Matching of a two-stage turbocharging system is important for high efficiency engines because the turbocharger is the most effective method of exhaust heat recovery. In this study, we propose a method to match a two-stage ... -
Planning for Successful Transients and Trips in a 1 MWe-Scale High-Temperature sCO2 Test Loop
(The American Society of Mechanical Engineers (ASME), 2019)Supercritical CO2 power cycles incorporate a unique combination of high fluid pressure, temperature, and density as well as limited component availability (e.g., high-temperature trip valves) that can result in operational ... -
Effects of the Interaction Point of Multi-Passage Swirlers on the Swirling Flow Field
(The American Society of Mechanical Engineers (ASME), 2019)An experimental study is conducted to understand the mean and instantaneous behavior of the swirling flow issued from a triple swirler influenced by a single critical geometrical parameter, termed as the passage length. ... -
Quasi-Static Thermal Modeling of Multiscale Sliding Contact for Unlubricated Brush Seal Materials
(The American Society of Mechanical Engineers (ASME), 2019)Prediction of contact temperature between two materials in high-speed rubbing contact is essential to model wear during unlubricated contact. Conventionally, assumptions of either a steady or an annular heat source are ... -
Classification and Modeling of Fluid Dynamic Loss in Aeroengine Transmission Gears
(The American Society of Mechanical Engineers (ASME), 2019)Reducing the fluid dynamic power loss for increasing speed is critical for the development of highly efficient high-speed aircraft engine gearing. In this study, the fluid dynamic loss was experimentally performed using a ... -
Experimental Validation of a Wide-Range Centrifugal Compressor Stage for Supercritical CO2 Power Cycles
(The American Society of Mechanical Engineers (ASME), 2019)Successful implementation of sCO2 power cycles requires high compressor efficiency at both the design-point and over a wide operating range in order to maximize cycle power output and maintain stable operation over a wide ... -
Investigation of In-Cylinder Engine Flow Quadruple Decomposition Dynamical Behavior Using Proper Orthogonal Decomposition and Dynamic Mode Decomposition Methods
(The American Society of Mechanical Engineers (ASME), 2019)In order to study the in-cylinder flow characteristics, one hundred consecutive cycles of velocity flow fields were investigated numerically by large eddy simulation, and the proper orthogonal decomposition (POD) algorithm ... -
Influence of Upstream Exhaust Manifold on Pulsatile Turbocharger Turbine Performance
(The American Society of Mechanical Engineers (ASME), 2019)This research was primary motivated by limited efforts to understand the effects of secondary flow and flow unsteadiness on the heat transfer and the performance of a turbocharger turbine subjected to pulsatile flow. In ... -
Investigations on the Sealing Effectiveness and Unsteady Flow Field of 1.5-Stage Turbine Rim Seal
(The American Society of Mechanical Engineers (ASME), 2019)This paper presents a numerical investigation on the sealing effectiveness and unsteady flow field of a 1.5-stage turbine with the front and aft wheel-space cavities. The sealing effectiveness and flow structure are studied ... -
Steady RANS of Flow and Heat Transfer in a Smooth and Pin-Finned U-Duct With a Trapezoidal Cross Section
(The American Society of Mechanical Engineers (ASME), 2019)Steady Reynolds-averaged Navier--Stokes (RANS) simulations were performed to examine the ability of four turbulence models—realizable k–ε (k–ε), shear-stress transport (SST), Reynolds stress model with linear pressure ... -
Attempts on the Reduction of Leakage Flow Through the Stator Well in an Axial Compressor
(The American Society of Mechanical Engineers (ASME), 2019)As performance improvements of compressors become more difficult to obtain, the optimization of stator well structure to control the reverse leakage flow is a more important research subject. Normally, the stator well can ... -
Continuous-Scan Phased Array Measurement Methods for Turbofan Engine Acoustic Testing
(The American Society of Mechanical Engineers (ASME), 2019)Imaging of aeroacoustic noise sources is routinely accomplished with geometrically fixed phased arrays of microphones. Several decades of research have gone into improvement and optimization of sensor layouts, selection ...