Download or read book Analysis of Tip clearance Flow in Turbomachines written by Chung Hua Wu and published by . This book was released on 1954 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Similarity Analysis of Compressor Tip Clearance Flow Structure written by G. T. Chen and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new approach is presented for analyzing compressor tip clearance flow. The basic idea is that the clearance velocity field can be (approximately) decomposed into independent throughflow and crossflow, since chordwise pressure gradients are much smaller than normal pressure gradients in the clearance region. As in the slender body approximation in external aerodynamics, this description implies that the three-dimensional, steady, clearance flow can be viewed as a two-dimensional, unsteady flow. Using this approach, a similarity scaling for the crossflow in the clearance region is developed and a generalized description of the clearance vortex is derived. Calculations based on the similarity scaling agree well with a wide range of experimental data in regard to flow features such as crossflow velocity field, static pressure field, and tip clearance vortex trajectory. The scaling rules also provide a useful way of exploring the parametric dependence of the vortex trajectory and strength for a given blade row. The emphasis of the approach is on the vortical structure associated with the tip clearance because this appears to be a dominant feature of the endwall flow; it is also shown that this emphasis gives considerable physical insight into overall features seen in the data.
Download or read book Study of Tip Clearance Flow in a Turbomachinery Cascade Using Large Eddy Simulation written by Donghyun You and published by . This book was released on 2004 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Radial Flow Turbocompressors written by Michael Casey and published by Cambridge University Press. This book was released on 2021-06-10 with total page 789 pages. Available in PDF, EPUB and Kindle. Book excerpt: An introduction to the theory and engineering practice that underpins the component design and analysis of radial flow turbocompressors. Drawing upon an extensive theoretical background and years of practical experience, the authors provide descriptions of applications, concepts, component design, analysis tools, performance maps, flow stability, and structural integrity, with illustrative examples. Features wide coverage of all types of radial compressor over many applications unified by the consistent use of dimensional analysis. Discusses the methods needed to analyse the performance, flow, and mechanical integrity that underpin the design of efficient centrifugal compressors with good flow range and stability. Includes explanation of the design of all radial compressor components, including inlet guide vanes, impellers, diffusers, volutes, return channels, de-swirl vanes and side-streams. Suitable as a reference for advanced students of turbomachinery, and a perfect tool for practising mechanical and aerospace engineers already within the field and those just entering it.
Download or read book An experimental study of tip clearance flow in a radial inflow turbine ASME 98 GT 467 written by R. Dambach 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, Jun 2-Jun 5, 1998.
Download or read book Tip Clearance Effects in Axial Turbomachines written by and published by . This book was released on 1986 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Three dimensional Navier Stokes Analysis of the Tip Clearance Flow in Linear Turbine Cascades written by Jong-Shang Liu and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ASME 69 WA FE 26 written by B. Lakshminarayana and published by . This book was released on 1969 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tip Clearance Flow in Turbomachines written by Walter Scott Gearhart and published by . This book was released on 1964 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two forms of cavitation have been recorded and attributed to the tip clearance flow. Cavitation resulting from this flow in the clearance area between the blade end and guide wall has been termed 'gap cavitation'. A second form of cavitation originates from the interaction of the tipleakage flow and main flow in the blade passage. This form of cavitation termed the 'tip vortex cavitation' occurs initially as a small 'feather' of cavitation attached to the leading edge tip of the blade, and as the local pressure is further reduced, the feather grows into a distinct cavity which extends from the leading edge of the blade and diagonally across the blade passage. Both forms of cavitation are considered in this report but primary effort was directed towards a study of 'gap cavitation'. (Author).
Download or read book Analysis of Turbine Rotor Tip Clearance Losses and Parametric Optimization of Shroud written by William V. Banks (III) and published by . This book was released on 2019 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerodynamic losses due to tip leakage in a High Pressure Turbine (HPT) rotor setting are analyzed using the commercial CFD software Star-CCM+. The compressible RANS equations were solved over unstructured polyhedral grids of 11 to 17 million cells, with turbulence resolved using the k-w SST model. A study of 3 blade tip/casing configurations at tip clearances between 0% and 4% of blade span is performed, with resulting mass-flow Reynolds #'s of 2.4-2.7 million and levels of reaction of 0.13-0.17. A flat-tip blade experienced a linear correlation between tip clearance and efficiency. The same blade with recessed casing was more efficient for small clearances, but large shear losses were seen to nullify this advantage at high clearances. A shrouded blade was more efficient than both at all clearances, displaying asymptotic behavior at high clearances. Various pressure and velocity monitoring techniques are employed to evaluate leakage flow and loss. Location and strength of leakage vortices are discussed, as these are closely tied with efficiency. A parametric study was performed on the shroud geometry, examining seal angle, number of seals, seal wear, and shroud axial gap. Efficiencies were compared between each study point at clearances of 2% and 4% of blade span. Total pressure loss was tracked across the blade and split between the main flow path and tip gap to distinguish between Profile and Internal Gap Shear losses. Axial gap was seen to have the greatest impact on efficiency, as a narrower gap acts as additional tip flow blockage and increases efficiency. At lower clearances, seal wear produced a negative impact as well.
Download or read book Investigation of Tip Clearance Flow Fields and Methods of Desensitizing Tip Clearance Effects in Turbines written by and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental and computational investigation was carried out during this reporting period to derive the flow field information at various axial and radial locations from the leading to the trailing edge in the tip clearance region of the rotor, and the casing static pressure was measured to derive the trajectory of the leakage vortex and the horseshoe vortex. The data provided here indicates that the tip leakage flow originates at approximately 50% of the chord and is confined to the tip clearance region due to the relative motion between the blade and the wall, as well as the secondary flow in the tip region. Both of these effects are responsible for keeping the tip vortex closer to the suction surface corner of the tip. The leakage flow losses are high, but are confined to an extremely small region near the tip of the suction surface as opposed to the secondary flow, which tends to increase the losses spread over a substantial portion of the passage. Therefore, the information provided here is substantially different from that derived on the basis of cascades testing. Numerical investigation of the flow field in the Penn State rotor based on the utilization of the Navier-Stokes solver has been carried out to gain a better understanding of the secondary and the tip leakage flow development. Analysis of the leakage flow development shows that the relative motion of the blade and the casing wall reduces the propagation of the leakage flow into the mainflow. The tip leakage vortex is confined to the suction surface corner of the casing. Most of the leakage losses are due to the mixing of the tip leakage vortex downstream of the trailing edge.
Download or read book Analysis of Three Dimensional Viscous Flow Including Tip Clearance Phenomena in Axial Turbines written by G. Billonet and published by . This book was released on 1992 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Combined Flow field temperature field Study of the Impact of Blade Tip Clearance on Turbomachinery type Blading written by Bonnie D. Marini and published by . This book was released on 2000 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: The presence of a clearance gap in a juncture flow results in several modifications to the endwall surface heat transfer, including: (1) an increase of roughly 25% in the local peak surface heat transfer, (2) a reduction in the extent of the endwall region which experiences elevated surface heat transfer, and (3) a dislocation of the region of highest heat transfer from upstream of the juncture comer to within the leading edge of the clearance gap.
Download or read book Comparative Study of Tip Clearance Effects in Compressors and Turbines written by Massachusetts Institute of Technology. Gas Turbine Laboratory and published by . This book was released on 1961 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Internal Flow written by E. M. Greitzer and published by Cambridge University Press. This book was released on 2007-02-26 with total page 739 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the analysis and behaviour of internal flows encountered in propulsion systems, fluid machinery (compressors, turbines and pumps) and ducts (diffusers, nozzles and combustion chambers). The focus is on phenomena that are important in setting the performance of a broad range of fluid devices. The authors show that even for complex processes one can learn a great deal about the behaviour of such devices from a clear understanding and rigorous use of basic principles. Throughout the book they illustrate theoretical principles by reference to technological applications. The strong emphasis on fundamentals, however, means that the ideas presented can be applied beyond internal flow to other types of fluid motion. The book equips students and practising engineers with a range of new analytical tools. These tools offer enhanced interpretation and application of both experimental measurements and the computational procedures that characterize modern fluids engineering.
Download or read book Methods of Desensitizing Tip Clearance Effects in Turbines written by and published by . This book was released on 2000 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study is an attempt to reduce the effect of the leakage vortex in axial flow turbines. A 3D Navier-Stokes CFD solver with two equation turbulence modeling was used to compute the flow through an axial flow turbine with modified blade tip designs. The three modified blade tip designs each involved adding a chamfer to the tip of the blade, in an attempt to diffuse the leakage flow through the gap and obstruct the leakage flow with the outer casing's shear layer. A baseline flat tip case and three modified tip cases were simulated and the leakage flow and vortex for each was analyzed in detail. By chamfering the blade tip near the trailing edge of the gap, the leakage flow inside the gap was turned toward the direction of the blade's camber. This turning resulted in a decrease in the size and strength of the leakage vortex and its subsequent losses, while at the same time, did not reduce the blade loading by an appreciable amount.
Download or read book A Correlation of Tip clearance efficiency Measurements on Mixed flow and Axial flow Turbomachines written by J. E. Hesselgreaves and published by . This book was released on 1969 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
