We quantify the sensitivity of turbine acoustic impedance to aerodynamic design parameters. Impedance boundary conditions are an influential yet uncertain parameter in predicting thermoacoustic stability gas combustors. extend semi-actuator disk model cambered blades, using non-linear time-domain computations vane and stage cascades with forcing for validation data. Discretising aerofoils into ...

The numerical simulation of unsteady flow in multi-stage turbomachinery is computationally expensive. A parallel code using message-passing interface libraries, which was developed to reduce the turnaround time and the cost of computation, is presented in this paper. The paper describes the details of the parallel algorithm, including the parallelization rationale, domain decomposition and proc...

Fouling is the most important performance degradation factor, so it is necessary to accurately predict the effect of fouling on engine performance. In the previous research, it is very difficult to accurately model the fouled axial flow compressor. This paper develops a new performance calculation method of fouled multistage axial flow compressor based on experiment result and operating data. F...

Dual turbocharger turbine is fed by an unequal out-of-phase mass flow charge almost all the time which have significant effects on its performance parameters and flow phenomena which are not well known. Besides fully understanding the flow behavior in the radial turbine suffers from lack of detailed information about the secondary flows. This article studies the secondary flow structure within ...

The article contains the results of validation of the numerical computational models of the uncooled turbines of gas turbine plants created in the software suite NUMECA. The findings of the study of impact of the computational mesh dimension, account of the pre-path cavities on the design characteristics of turbines by modeling are represented in this article. As a result, there have been devel...

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 a po...

Marine and hydrokinetic (MHK) technology performance testing in the laboratory and field supports the US Department of Energy’s MHK program goals to advance the technology readiness levels of MHK machines, to ensure environmentally responsible designs, to identify key cost drivers, and to reduce the cost of energy of MHK technologies. Laboratory testing results from scaled model machine testing...

In modern turbine rotors, tip-leakage flow is a common phenomenon that accounts for about 1/3 of the stage loss. Studies show as imposed load increases, shock wave appears in tip region, which causes significant interference on leakage vortex. present study, numerical simulations are carried out to investigate influence loss and breakdown The obtained results indicate with no effective control ...

The decision-making process behind the selection of a gas turbine engine (GT) is crucial and must be made in accordance with economic, environmental, technical requirements. This paper presents relevant exergoeconomic exergoenvironmental analyses for four GT engines different compressor configurations. configurations are identified according to type compressor: axial, axial-centrifugal, two-sta...