...Koichi Yonezawa; Tomoki Kagayama; Masahiro Takayasu; Genki Nakai; Kazuyasu Sugiyama; Katsuhiko Sugita; Shuichi Umezawa Deteriorations of nozzle guide vanes (NGVs) and rotor blades of a steam turbine through a long-time operation usually decrease a thermal efficiency and a power output...

...Wen Li; Xing Wang; Xuehui Zhang; Xinjing Zhang; Yangli Zhu; Haisheng Chen It is a common practice to use closed impeller in radial inflow turbine against the flow leakage from tip clearance of impellers, especially in small volume flow condition. It utilizes labyrinths between the shroud...

... turbochargers (TC) are especially susceptible to this dynamic and are often equipped with variable geometry turbines (VGT) to mitigate some of this effect. Assisted boosting techniques that add power directly to the TC shaft from a power source that is independent of the engine have been shown to significantly...

...Soo Young Kang; Jeong Jin Lee; Tong Seop Kim; Seong Jin Park; Gi Won Hong This study analyzes the fluid dynamic characteristics of an ultrasupercritical (USC) high-pressure turbine with additional steam supplied through an overload valve between the second and third stages. The mixing between...

.... Editor: David Wisler. 24 07 2017 17 08 2017 Acoustic emission Environmental Gas turbine technology Turbines Figure 7 depicts a P th dependence on P el . There is a vast difference in thermal input power ( P th ) for load points with and without bleed air usage...

... and deposition processes. The aim of this study is to analyze the influence of roughness on the aerodynamics of the low-pressure turbine (LPT) of a midsized high bypass turbofan. In order to gain a better insight into the operational roughness structures, a sample of new, used, cleaned, and reworked turbine...

...Tomomi Nakajima; Kiyoshi Segawa; Hiromichi Kitahara; Akimitsu Seo; Yutaka Yamashita; Takeshi Kudo All turbine blades have mistuned structures caused by manufacturing variations within the manufacturing tolerance, such as the geometrical deviations and variance of material properties. The mistuning...

.... Editor: David Wisler. 20 05 2017 14 06 2017 Cooling Engines Experimental Gas turbine technology Heat transfer Turbines In the quest for ever-increasing gas turbine performance, the firing temperature of these machines has increased steadily to the point where...

... and interconnecting ducting, all subject to tight packaging constraints. This paper considers the aerodynamic optimization of the exhaust side of a two-stage air system for a Caterpillar 4.4 l heavy-duty diesel engine, focusing on the high pressure turbine (HPT) wheel and interstage duct (ISD). Using current...

...: David Wisler. 03 07 2017 08 08 2017 Experimental Turbines Vibration Power dense turbomachinery is often faced with rotordynamic challenges typically resulting from destabilizing fluid forces between the rotating assembly and stationary frame. These challenges have been...

... amplitude in turbine blades. The experimental data collected with these test rigs do not increase the knowledge about the damper dynamics, and therefore, the uncertainty on the damper behavior remains a big issue. In this paper, a different approach to evaluate the damper–blade interaction has been put...

...Pietro Rossi; Asad Raheem; Reza S. Abhari Formation of thin liquid films on steam turbine airfoils, particularly in last stages of low-pressure (LP) steam turbines, and their breakup into coarse droplets is of paramount importance to assess erosion of last stage rotor blades given by the impact...

.... , 126 (12), pp. 1216 – 1223 . 10.1061/(ASCE)0733-9399(2000)126:12(1216) [6] Chen , W. J. , 1997 , “ Energy Analysis to the Design of Rotor-Bearing Systems ,” ASME J. Eng. Gas Turbines Power , 119 ( 2 ), pp. 411 – 417 . 10.1115/1.2815590 [7] Chen , W. J. , and Gunter , E. J...

...Leonid Moroz; Glenn Doerksen; Fernando Romero; Roman Kochurov; Boris Frolov In order to achieve the highest power plant efficiency, original equipment manufacturers continuously increase turbine working parameters (steam temperatures and pressures), improve components design, and modify start-up...

...Mario Schinnerl; Jan Ehrhard; Mathias Bogner; Joerg Seume The measured performance maps of turbochargers (TCs), which are commonly used for the matching process with a combustion engine, are influenced by heat transfer and friction phenomena. Internal heat transfer from the hot turbine side...

... have to operate in significantly degraded environments consisting of sand, dust, ash, and other particulates. Marine gas turbine engines are subjected to salt spray, while the coal-burning industrial power generation turbines are subjected to fly ash. The presence of solid particles in the working...

... in a rotating turbine facility. This paper specifically focuses on the challenges related with the design, verification, and monitoring of the running tip clearance during a turbine experiment. In the large-scale turbine facility of the von Karman Institute, a rainbow rotor was mounted for simultaneous...

... of compression system erosion and material deposition in the combustor and on the high-pressure turbine (HPT) inlet vanes (and rotor blade complications) whereas the older engines (P/W TF-33 and J-57) experienced primarily an erosion problem as a result of the lower turbine inlet temperatures (TIT). As part...

...James A. Scobie; Carl M. Sangan; J. Michael Owen; Gary D. Lock This review summarizes research concerned with the ingress of hot mainstream gas through the rim seals of gas turbines. It includes experimental, theoretical, and computational studies conducted by many institutions, and the ingress...

... are in progress for commercially rolled foil with widths over 39 cm. The first trial completed 3000 hrs in a microturbine recuperator with an elevated turbine inlet temperature and showed limited degradation. A longer microturbine trial is in progress. A third exposure in a larger turbine has passed 16,000 hrs...