... with the periodic sweeping jets. Will they move synchronously with the fluid or asynchronously with a phase lag? How would the interaction between the droplets and the sweeping jets affect the film cooling effectiveness? To answer these questions, Part II of this paper specifically focuses on investigating...

...Ramy Abdelmaksoud; Ting Wang The sweeping jet can be a promising candidate in film cooling applications since it has a large lateral jet spreading which can be considered an advantage when compared to the regular steady jet film cooling. Fluidic oscillators can generate a sweeping jet without...

... row will form combined-hole units. The kidney–vortex pairs in the combined-hole unit will interact with each other and get weakened, finally enhancing film cooling performance. Compared to the original two rows of staggered holes, the coolant mass flowrate will be reduced by 25% for the new hole...

...Bo Bai; Zhigang Li; Jun Li; Shuo Mao; Wing F. Ng In this paper, the endwall film cooling and vane pressure side surface phantom cooling performances of a first nozzle guide vane (NGV) with endwall contouring, similar to an industry gas turbine, were experimentally and numerically evaluated...

...Ting Wang; Lei Zhao; Ramy Abdelmaksoud Film cooling is a cooling technique widely used in high-performance gas turbines to protect the turbine airfoils from being damaged by hot flue gases. Motivated by the need to further improve the turbine hot section cooling performance, a mist/air film cooling...

...Ramy Abdelmaksoud; Ting Wang; Lei Zhao In this Part II of the paper, a numerical study has been performed to validate the multiphase computational fluid dynamics (CFD) model by comparing its results to the experimental data of an air/mist film cooling study presented in Part I . The complete...

...Rui Zhu; Shulei Li; Gongnan Xie Internal cooling and film cooling, as two main cooling methods in modern gas turbines, work together to protect the high-temperature components of gas turbines. This paper presents the results of a computational study on cooling performance for a flat plate with both...

...Spencer J. Sperling; Randal M. Mathison Gas turbine film cooling creates complicated and highly unsteady flow structures. This study seeks to examine the unsteady characteristics created by different cooling hole inlet geometries using a fast-response pressure-sensitive paint (PSP) technique able...

... of the cooling hole to investigate incoming turbulent boundary layer effect on the film cooling flow behavior. Without the trip, horseshoe vortex generated by laminar boundary layer induced laterally discharging cooling flow in the lateral direction. Meanwhile, the induced cooling flow formed high film cooling...

... was 500,000 with an inlet turbulence intensity of 15%. The film cooling effectiveness and heat transfer coefficient distribution were obtained by the transient liquid crystal (TLC) technology, three mass flow ratios (MFRs = 7.0%, 9.9%, 11%) and two density ratios (DRs = 1.0, 1.5) were tested. The results show...

.... The present study experimentally investigates the effects of leakage flow through the slot between the gas turbine vane and blade rows on the film cooling effectiveness of the forward region of the shroud ring segment. The experiment is carried out in a linear cascade with five blades. Instead of the vane...

... of the micro-scale surface structures is demonstrated by using well-validated numerical simulations. Overall film cooling performance and total thermodynamic loss are examined to comprehensively evaluate the feasibility of the micro-scale surface patterns for three cavity air flowrates. Detailed thermal fields...

...Ashutosh Kumar Singh; Kuldeep Singh; Dushyant Singh; Niranjan Sahoo The large eddy simulations (LES) are performed to access the film cooling performance of cylindrical and reverse shaped hole for forward and reverse injection configurations. In the case of reverse/backward injection, the secondary...

...Mallikarjuna Rao Pabbisetty; B. V. S. S. S. Prasad A novel mist-assisted air film cooling scheme is proposed by Li and Wang (2006, “Simulation of Film Cooling Enhancement With Mist Injection,” ASME J. Heat Transfer, 128 , pp. 509–519) to increase the film cooling effectiveness of a gas turbine...

... of the air/mist fluid flow inside and outside the blades as well as the heat conduction through the blade body. The complete 3D blade with internal cooling passages and external film cooling holes on the surface and blade tip is simulated in a rotating, periodic sector of the blade. The discrete phase model...

...Bo-lun Zhang; Hui-ren Zhu; Cun-liang Liu; Jian-sheng Wei The film cooling characteristics of the transverse trench (TT) and the double-wave trench (DWT) were numerically studied by using Reynolds-averaged Navier–Stokes simulations with realizable k–ɛ turbulence model and enhanced wall treatment...

...Ting Wang; Reda Ragab This paper presents a numerical study to investigate the feasibility of transporting water mist to the rotating blades of a high-pressure turbine. The idea of using mist film cooling to enhance conventional air cooling has been proven to be a feasible technique under...

...Xiao-Ming Tan; Jing-Zhou Zhang; Qing-Zhi Cai Experimental and numerical research is performed to illustrate the effects of pin-fin shapes on mesh-fed slot film cooling performance on a flat-plate model. Three types of pin-fin shapes (such as circular, elliptical, and drop-shaped) with the same...

...E. Kannan; Seralathan Sivamani; D. G. Roychowdhury; T. Micha Premkumar; V. Hariram Three-dimensional Reynolds-averaged Navier–Stokes equations with shear stress transport turbulence model are used to analyze the film cooling effectiveness on a flat plate having single row of film hole involving...

...Chang Han; Zhongran Chi; Jing Ren; Hongde Jiang The classical kidney vortexes produced in a round-hole film cooling system are the most important factor adversely influencing on the film cooling effectiveness. It is a good way to overcome the kidney vortexes and improve the film cooling effect...