INTRODUCTION Cross-flow turbines present several advantages over axial flow types for power generation from moving water. First, the rectangular form factor is well suited to take advantage of the hydrokinetic energy often concentrated in shallow channels. This form factor presents an opportunity to construct arrays with high blockage (ratio of swept area to channel cross-sectional area), poten...

A four-blade-passage numerical model was developed for a two-stage axial-flow compressor with an inlet guide vane (IGV) the purpose of studying steady and dynamic characteristics approaching its stability limit. The flow-field information indicated that tip-leakage flow decreased more rapidly from blade’s leading edge to trailing edge, decreasing rate. leakage verified be driven via blade load ...

The efficiency of a gas turbine largely depends on the aerodynamics and pressure recovery capacity diffuser. For reliable numerical simulation flow in diffuser, model must be validated basis experimental data structure. An study stage diffuser system was carried out. results this investigation are as follows: area applicability method for assessing determined; recommendations preparing transfer...

in this paper, the fluid-structure interaction phenomenon and the research history are described. then due to the complex and specific working conditions of a turbine blade, we have investigated the phenomenon on this subject. the fluid-structure interaction on a turbine blade model has been simulated by using structural and fluid flow section of ansys software. a model of turbine blade with ai...

Significance of the Problem Control of blade-tip clearance in the compressor and turbine sections of gas turbine engines can improve efficiency, minimize leakage flow, and shorten engine development time. Tip clearance varies throughout different operating conditions (e.g., start-up, idle, full power, shut-down) because of different radial forces and different thermal expansion coefficients and...

Prefilming air-blast atomizers are widely used in modern gas turbine combustors. Due to insufficient awareness of the coupling mechanism multi-stage swirling flow turbines, there is a lack effective methods for field optimization combustor. In this study, effect some critical parameters on prefilming atomizer was analyzed with CFD. The include angle and number first swirler blades, second blade...

The use of a shroud around the rotor of a wind turbine has been known to augment the airflow through the rotor plane and hence result in improved performance. This work uses Computational Fluid Dynamics (CFD) to assess the validity of several simple theories which attempt to extend Betz theory to shrouded turbines. Two CFD models are employed and compared to predictions of previously published ...

The need of a continuous improvement in gas turbine efficiency for propulsion and power generation, as well as the more demanding operating conditions and power control required to these machines, still ask for great efforts in the design and analysis of the high pressure section of the turbo-expander. To get detailed insights and improve the comprehension of the flow physics, a wide experiment...

In the current work, different methods for optimization of turbine blade internal cooling are investigated, to achieve higher cyclic efficiency and output power for a typical gas turbine. A simple two-dimensional model of C3X blade is simulated and validated with available experimental data. The optimization process is performed on this model with two different methods. The first method is ...