... compared with a uniform one can lead to better diffuser performance and that a moderate residual swirl can improve the performance as well. In the second part of this paper, the minimization of exhaust losses in heavy-duty gas turbines is discussed and illustrated by two practical examples. 17 10...

...Weiguo Ai; Thomas H. Fletcher Numerical computations were conducted to simulate flash deposition experiments on gas turbine disk samples with internal impingement and film cooling using a computational fluid dynamics (CFD) code ( FLUENT ). The standard k- ω turbulence model and Reynolds-averaged...

... 2011 cooling fly ash gas turbines thermal barrier coatings Increasing the inlet temperature and replacing natural gas with low grade fuels have become two trends in advancing modern gas turbine technology. Since inlet temperatures have exceeded the allowable material temperature...

... are coal, biomass, and oil residue-petcoke. In a combined-cycle power plant (e.g., IGCC), filtered syngas that is generated from these “dirty” fuels in a gasifier still contains small amounts of entrained particulate, which is then introduced with the combustion products into the gas turbine. Metal...

... turbines heat transfer surface roughness In modern gas turbines, high efficiency is not only reached by increasing the thermodynamic efficiency with higher turbine inlet temperature and engine pressure ratio. Increasing stage load demands a consecutive improvement of component efficiency. Hence...

...Yogi Sheoran; Bruce Bouldin; P. Murali Krishnan Inlet swirl distortion has become a major area of concern in the gas turbine engine community. Gas turbine engines are increasingly installed with more complicated and tortuous inlet systems such as those found on embedded installations on unmanned...

...Valerio Lallini; Jan Janikovic; Pericles Pilidis; Riti Singh; Panagiotis Laskaridis A tool to evaluate the turbine cooling air schedule during the flight path is presented. The method is suitable for complex gas turbine engine models where accurate calculation of thermodynamic parameters...

...J. Michael Owen; Kunyuan Zhou; Oliver Pountney; Mike Wilson; Gary Lock Rotationally induced (RI) ingress is caused by the negative pressure (relative to the external air) inside the wheel-space of a gas turbine; this negative pressure, which is created by the rotating flow in the wheel-space...

... jets, each impinging on a different adjacent wall. The ribs are aligned with the inclined jet axes, have the same pitch, and are staggered to the impinging jets. The flow exhausts through two staggered rows of holes opposing the impingement wall. The passage geometry is related to a modern gas turbine...

... was key to producing the most effective separation control. Evidence suggests that flow control using vortex generator jets (VGJs) will be effective in the highly unsteady low pressure turbine environment of an operating gas turbine, provided the VGJ location and amplitude are adapted for the specific...

...Budimir Rosic; John D. Denton; John H. Horlock; Sumiu Uchida This paper numerically investigates the interaction between multiple can combustors and the first vane in an industrial gas turbine with 16 can combustors and 32 vanes in order to find ways of reducing the overall cooling requirements...

... and the vortex structures clearly, and overpredict film cooling effectiveness on the partial surface. 28 06 2010 23 07 2010 14 07 2011 14 07 2011 blades computational fluid dynamics convection cooling durability flow simulation gas turbines turbulence Application...

... Coriolis force finite volume methods flow simulation gas turbines heat transfer Navier-Stokes equations vortices Gas turbines are widely used for power generation as well as aircraft propulsion. The continuous demand for increased overall efficiency and higher specific power output...

...L. He Gas turbine performance improvement requires efficient and accurate prediction tools for film-cooling of high pressure turbine blades. Use of computational fluid dynamics in the cooling design faces a challenge due to a wide range of length scales to be resolved. The difficulty is also...

...A. Hirschmann; S. Volkmer; M. Schatz; C. Finzel; M. Casey; M. Montgomery Large industrial gas turbines for combined heat and power generation normally have axial diffusers leading to the heat recovery steam generator. The diffusers operate with high inlet axial Mach number (0.6...

...Ting Wang; T. S. Dhanasekaran Internal mist/steam blade cooling technology is proposed for advanced gas turbine systems that use the closed-loop steam cooling scheme. Previous experiments on mist/steam heat transfer with a 2D slot jet impingement onto a concave surface showed cooling enhancement...

... 06 2011 28 06 2011 aerodynamics blades boundary layers computational fluid dynamics engines gas turbines nozzles transonic flow wakes The performance of the turbine section in a gas turbine engine plays a major role in the overall efficiency of the engine. They depend...

...Arne Vorreiter; Susanne Fischer; Horst Saathoff; Rolf Radespiel; Joerg R. Seume Airfoil active flow control has been attempted in the past in order to increase the permissible loading of boundary layers in gas turbine components. The present paper presents a stator with active flow control...

...Md. Hamidur Rahman; Sung In Kim; Ibrahim Hassan High thermal load appears at the blade tip and casing of a gas turbine engine. It becomes a significant design challenge to protect the turbine materials from this severe situation. As a result of geometric complexity and experimental limitations...

.... cooling gas turbines heat transfer jets numerical analysis turbulence vortices film cooling waist-shaped slot hole converging slot hole transient liquid crystal measurement numerical simulation Many studies show that employing shaped holes is an effective way to improve the film...