...Vlad Hasmatuchi; Mohamed Farhat; Steven Roth; Francisco Botero; François Avellan An experimental investigation of the rotating stall in reduced scale model of a low specific speed radial pump-turbine at runaway and turbine brake conditions in generating mode is achieved. Measurements of wall...

...-dimensional solution of flow conditions through the turbine along the mean streamline. In this analysis, the changes of fluid and flow properties between different components of turboexpander have been considered. Overall, turbine geometry, pressure ratio, and mass flow rate are input information. The output...

...Soo-Yong Cho; Chong-Hyun Cho; Kook-Young Ahn; Young-Cheol Kim The partial admission technique is widely used to control the output power of turbines. In some cases, it has more merits than full admission. However, additional losses, such as expansion, mixing, or pumping, are generated in partial...

...M. Pau; G. Paniagua Ensuring an adequate life of high pressure turbines requires efficient cooling methods such as rim seal flow ejection from the stator-rotor wheel space cavity interface, which prevents hot gas ingress into the rotor disk. The present paper addresses the potential to improve...

...Bingwei Song; Hironori Horiguchi; Yumeto Nishiyama; Shinichiro Hata; Zhenyue Ma; Yoshinobu Tsujimoto The fundamental characteristics of rotordynamic fluid force moment on the backshroud of a Francis turbine runner in precession motion were studied using model tests and computations based on a bulk...

...Romeo Susan-Resiga; Sebastian Muntean; Vlad Hasmatuchi; Ioan Anton; François Avellan We perform a numerical analysis of the decelerated swirling flow into the discharge cone of a model Francis turbine operated at variable discharge and constant head, using an axisymmetric turbulent swirling flow...

...Jorge Arpe; Christophe Nicolet; François Avellan The complex three-dimensional unsteady flow developing in the draft tube of a Francis turbine is responsible for pressure fluctuations, which could prevent the whole hydropower plant from operating safely. Indeed, the Francis draft tube is subjected...

...M. Torresi; S. M. Camporeale; G. Pascazio This paper presents the results of the numerical simulations carried out to evaluate the performance of a high solidity Wells turbine designed for an oscillating water column wave energy conversion device. The Wells turbine has several favorable features...

...X. Q. Huang; L. He; David L. Bell This paper presents a combined experimental and computational study of unsteady flows in a linear turbine cascade oscillating in a three-dimensional bending/flapping mode. Detailed experimental data are obtained on a seven-bladed turbine cascade rig. The middle...

...Włodzimierz Wróblewski; Sławomir Dykas; Andrzej Gardzilewicz; Michal Kolovratnik This paper presents the experimental investigations of steam flow with condensation in the blading system of the low-pressure (LP) part of a 360 MW turbine. To this end, special probes were used, which provided flow...

...Shahram Derakhshan; Bijan Mohammadi; Ahmad Nourbakhsh Pumps as turbines have been successfully applied in a wide range of small hydrosites in the world. Since the overall efficiency of these machines is lower than the overall efficiency of conventional turbines, their application in larger...

...Jongwook Joo; Paul Durbin The cause of overprediction of cooling efficiency by unsteady Reynolds averaged simulations of turbine blade trailing edge cooling flow is investigated. This is due to the deficiency in the level of unsteady coherent energy very near to the wall. Farther from the wall...

...Ri-kui Zhang; Feng Mao; Jie-Zhi Wu; Shi-Yi Chen; Yu-Lin Wu; Shu-Hong Liu Under part-load conditions, a Francis turbine often suffers from very severe low-frequency and large-amplitude pressure fluctuation, which is caused by the unsteady motion of vortices (known as “vortex ropes”) in the draft...

... technology, which was spun to 330,000 rpm and produced 0.38 W of mechanical power. Modeling suggests a turbine adiabatic efficiency of 35% and Re = 266 at the maximum speed. The pressure distribution across the blade rows was measured and showed close agreement with the calculation results. Using the model...

...Andreas Gross; Hermann F. Fasel Laminar separation on the suction side of low-pressure turbine blades at low Reynolds number operating conditions deteriorates overall engine performance and has to be avoided. This requirement affects the blade design and poses a limitation on the maximum...

...U. Hampel; D. Hoppe; A. Bieberle; R. Kernchen; K.-H. Diele; E. Schleicher; M. J. da Silva; C. Zippe Gamma ray tomography has been used to visualize fluid distributions in a rotating fluid coupling in different operation points at a pump speed of 780 rpm and lower turbine speeds. The gamma ray...

...S. Sarkar The paper describes the flow structures on the suction surface of a highly cambered low-pressure turbine (LPT) blade (T106 profile) subjected to periodic convective wakes. A separation bubble on the rear half of the suction side of the blade was found to form under the operating condition...

...Donald P. Rizzetta; Miguel R. Visbal Recent numerical simulations have indicated the potential of plasma-based active flow control for improving the efficiency of highly loaded low-pressure turbines. The configuration considered in the current and earlier simulations correspond to previous...

... equations depending on appropriate physical assumptions. Due to the complexity of the two-phase phenomena, the model is presented and validated by exploring phase transition and droplet dynamics in a turbine cascade geometry. The influence of droplet inertia on localized homogeneous nucleation is examined...

...Sven König; Bernd Stoffel A comprehensive investigation was carried out using two different experimental setups: A 1.5-stage axial turbine and a simplified model, a “spoked-wheel” setup with a rotating wake generator consisting of cylindrical bars. The second stator of the turbine was designed...