Download or read book Influence of Purge Flow on Performance of an End Wall Profiled Turbine written by Peter Schüpbach and published by Sudwestdeutscher Verlag Fur Hochschulschriften AG. This book was released on 2010-03 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this study is the investigation of the promising secondary flow control technique of non-axisymmetric end wall profiling in a more engine representative environment. In this work end wall profiling is applied to the first stage of a high work, 1.5 stage, unshrouded turbine. Without purge flow non-axisymmetric end wall profiling has demonstrated a considerable increase of total-to-total efficiency. The two designs increased the total-to-total efficiency by 1% and 0.3% respectively relative to a baseline efficiency of already 91%. The first end wall design having the highest efficiency without purge flow shows the highest efficiency drop of 1.2% per injected massflow percent if purge flow is applied. The second end wall design and the baseline case show comparable sensitivities with -0.7%/% and -0.6%/% to purge flow. The reason for the increased sensitivity of the first design is an increased circumferential pressure gradient at the first vane rim compared to the baseline case and the second end wall design. Resulting in the strongest injection jets and therefore in more induced vorticity.
Download or read book Influence of Rim Seal Purge Flow on the Performance of an End Wall Profiled Axial Turbine written by Peter Schüpbach and published by . This book was released on 2009 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Asian Research on Thermal and Fluid Sciences written by Abhilash Suryan and published by Springer Nature. This book was released on 2020-02-18 with total page 693 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a collection of the best papers from the Seventh Asian Joint Workshop on Thermophysics and Fluid Science (AJWTF7 2018), which was held in Trivandrum, India, in November 2018. The papers highlight research outputs from India, China, Japan, Korea and Bangladesh, and many of them report on collaborative efforts by researchers from these countries. The topics covered include Aero-Acoustics, Aerodynamics, Aerospace Engineering, Bio-Fluidics, Combustion, Flow Measurement, Control and Instrumentation, Fluid Dynamics, Heat and Mass Transfer, Thermodynamics, Mixing and Chemically Reacting Flows, Multiphase Flows, Micro/Nano Flows, Noise/NOx/SOx Reduction, Propulsion, Transonic and Supersonic Flows, and Turbomachinery. The book is one of the first on the topic to gather contributions from some of the leading countries in Asia. Given its scope, it will benefit researchers and students working on research problems in the thermal and fluid sciences.
Download or read book Fluid Mechanics and Fluid Power Vol 1 written by Suvanjan Bhattacharyya and published by Springer Nature. This book was released on 2023-05-10 with total page 479 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the select proceedings of the 48th National Conference on Fluid Mechanics and Fluid Power (FMFP 2021) held at BITS Pilani in December 2021. It covers the topics such as fluid mechanics, measurement techniques in fluid flows, computational fluid dynamics, instability, transition and turbulence, fluid‐structure interaction, multiphase flows, micro- and nanoscale transport, bio-fluid mechanics, aerodynamics, turbomachinery, propulsion and power. The book will be useful for researchers and professionals interested in the broad field of mechanics.
Download or read book Interaction Mechanisms Between Rim Seal Purge Flow and Profiled End Walls in a Low pressure Turbine written by Philipp Jenny and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Combustor Exit Flow on Turbine Performance and Endwall Heat Transfer written by Gregor Schmid and published by . This book was released on 2014 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Impact of Unsteady Secondary Air Flow Interaction with Main Flow on Loss Generation in Axial Turbines written by David Madison Clifton and published by . This book was released on 2014 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: Secondary air, often called purge air, is injected through the endwall gap between stationary vanes and rotating rotors in axial turbines to prevent ingestion of the hot working gas into the endwall cavities. Three-dimensional flow computations, unsteady as well as steady, have been carried out to assess the role of vane-rotor stage induced flow unsteadiness on loss generation from purge flow interacting with main flow. Computational models of varying physical and geometry complexity that range from simple bladeless annulus configurations to vane-rotor stage configurations were used for identifying the specific flow features responsible for loss generation; these were also complemented by control volume analyses of simple two streams flow model. Computed results showed that the vane induced circumferentially non-uniform static pressure field, and to a much lesser extent rotor blade induced bow waves, significantly increases loss generation upon introduction of injected flow with and without swirl; any flow approximations that renders the pressure field imposed on the purge flow as circumferentially uniform would underestimate the loss due to purge flow-main flow interaction. Flow unsteadiness induced by vane-rotor interaction has marginal, if any, impact on loss generation from introducing purge flow into the main flow path. Judicious flow path modification such as endwall contouring that reduces or eliminates vane-induced static pressure circumferential non-uniformity imposed upon the purge flow has been shown to significantly reduce the purge flow driven loss. Computed results also show that loss generation increases linearly with injected mass flow rate ( 7.5% more loss per 1% purge flow) and decreases quadratically with purge flow swirl until it matches the main flow circumferential velocity ( 85% reduction in purge flow induced based loss at that point). Purge flow induced loss has a weak dependence on the width of the purge duct and angle of injection.
Download or read book Proceedings of the 1st International Conference on Fluid Thermal and Energy Systems written by Sudev Das and published by Springer Nature. This book was released on 2024-01-17 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises the proceedings of the 1st International Conference on Fluid, Thermal and Energy Systems. The contents of this book focus on phase change heat transfer, advanced energy systems, separated flows, turbulence and multi-phase modeling, computational fluid flow and heat transfer, thermal energy storage systems, integrated energy systems, nuclear thermal hydraulics, heat transfer in nanofluids, etc. This book serves as a useful reference to researchers, academicians, and students interested in the broad field of thermo-fluid science and engineering.
Download or read book Secondary Air Interaction with Main Flow in Axial Turbines written by Metodi Blagoev Zlatinov and published by . This book was released on 2011 with total page 157 pages. Available in PDF, EPUB and Kindle. Book excerpt: Secondary air, known as purge air, is injected through seals in the hub and shroud of axial turbines to prevent hot gas ingestion into the endwall cavities. An investigation into the interaction of purge ow with turbine main ow has been undertaken, to determine where losses are generated, how they are generated, and what are the most eective ways for reducing them. The eect of purge ow design on the system's susceptibility to ingestion was also studied. Tools developed for accomplishing these objectives include: a consistent framework for isolating entropy generated due to viscous effects, a procedure for factoring out individual loss categories, and a linear model for secondary air ow response to the main flow pressure field. These tools, applied to steady computations, elucidate four routes through which change in loss generation is brought about by purge air injection: a shear layer between purge and main streams, modification of the secondary ow through the blade passage, an increase in degree of reaction, and the potential for reducing tip clearance ow (for the case of purge ow injected from the shroud). It was further determined that purge air mass ow and swirl velocity are eective parameters for mitigating loss, with a potential for 70% reduction in purge ow losses. By contrast, purge slot axial inclination and gap width do not affect the loss characteristics of purge ow by more than 6%. The benet of pre-swirling purge ow can be negated by decreased sealing effectiveness, if ingestion is driven by the pressure non-uniformity associated with the rotor upstream in influence. However for a representative vane-rotor stage, in which the vane-induced circumferential pressure non-uniformity dominates in the intra vane-rotor gap, pre-swirling purge flow can be beneficial to deterring hot gas ingestion. Finally a framework has been formulated for assessing the time-averaged impact of unsteady vane-rotor interaction on purge ow-induced loss generation. Preliminary results suggest that ow unsteadiness can result in substantially higher losses associated with purge flow injection.
Download or read book Aerodynamic Influence of Rim Seal Purge Flow Injection on the Main Flow in a 1 5 Stage Axial Turbine with Non Axisymmetric End Wall Contouring written by Lukas Maximilian Schäflein and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 2023 Asia Pacific International Symposium on Aerospace Technology APISAT 2023 Proceedings written by Song Fu and published by Springer Nature. This book was released on with total page 1975 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Endwall Manufacturing Variations on Turbine Performance written by Robert Peter Grewe and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of End Wall Profiling in a Multi stage Reaction Turbine written by Simon Lundeberg and published by . This book was released on 1991 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Influence of Endwall Contouring on the Performance of a Turbine Nozzle Guide Vane written by Vincenzo Dossena and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented at the International Gas Turbine & Aeroengine Congress & Exhibition, Stockholm, Sweden, June 2 - June 5, 1998.
Download or read book 36th AIAA ASME SAE ASEE Joint Propulsion Conference Exhibit 2000 3350 2000 3399 written by and published by . This book was released on 2000 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Vane Trailing Edge Flow on Inter Stage Turbine Sealing written by Ivan Monge-Concepcion and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern gas turbine development is moving towards increased engine efficiency and decreased emissions driven, in part, by a continual increase of combustor exit temperatures. To thermally protect critical engine components from catastrophic component failure, a significant fraction of the compressor flow is bypassed around the combustor and used in secondary flow systems. Use of this secondary flow results in a reduced amount of work, which prompts engine designers to optimize the use of these secondary flows. Two applications of the secondary airflow system is a sealing flow for the inter-stage gap and as a cooling flow used in film cooling holes and vane trailing edge flow. The use of sealing flow in the inter-stage gap between the stator vane wall and the rotating disk wall has been widely studied by previous researchers. These studies have built a fundamental understanding of the flow physics involved in hot gas ingestion and is currently applied in the design of overlapping geometries, called rim seals, to deter ingestion. Vane trailing edge (VTE) flows are another type of cooling flow in the secondary airflow system whose main purpose is aimed at optimizing the aerodynamics of the rotor blades by filling in the lower pressure wake region downstream of the stationary vanes. Although there is a vast amount of research in the open literature on the optimal use of purge flows, there are no open studies on the impact of vane trailing edge flows on rim sealing performance. The research presented in this dissertation bridges the gap between the secondary flow used to seal the turbine rim cavity between turbine stages and the influence of vane trailing edge flow (VTE), which is the first presented in the open literature. The measured results confirm the presence of VTE flow in the turbine wheelspace cavity between the stationary vanes and rotating blades. Results show that VTE flow migrates from the main gas path and is entrained into the wheelspace cavity which improves rim cooling effectiveness in the wheelspace cavities. By using a tracer gas, this study found that a superposition relationship exists between the individual secondary flows. Flowfield data confirmed a significant migration of VTE flow occurred over a range of conditions. Through the use of fast-responding pressure transducers, low-pressure cells that did not correspond with the number airfoils were identified and did not change with the presence of the VTE flow. Results were compared with current ingestion prediction models to and found that current prediction models underpredict the entrainment of VTE flow into the rim seal cavity and consequently the cooling fluid potential of VTE flow. The potential of improving VTE flow prediction tools can potentially optimize the use of sealing and VTE flows to offset the detrimental effect of hot gas ingestion.
Download or read book Influence of Endwall Flow on Airfoil Suction Surface Mid height Boundary Layer Development in a Turbine Cascade written by O. P. Sharma and published by . This book was released on 1982 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the results of an analysis to assess the influence of cascade passage endwall flow on the airflow suction surface mid-height boundary layer development in a turbine cascade.
