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Scalloped Leading Edge Vaned Diffuser Analysis For A Compact High Pressure Ratio Centrifugal Compressor
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Book Synopsis Scalloped Leading Edge Vaned Diffuser Analysis for a Compact High Pressure Ratio Centrifugal Compressor by : Vinod Poonamchand Gehlot
Download or read book Scalloped Leading Edge Vaned Diffuser Analysis for a Compact High Pressure Ratio Centrifugal Compressor written by Vinod Poonamchand Gehlot and published by . This book was released on 2015 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microturbines and small gas turbines are often an attractive option for turbo-hybryd application research in aviation due to their simple design and high power to weight ratio. However, the low operating pressure ratios of microturbines leads to low thermal efficiency, which results in very high fuel consumption. Higher operating pressure ratios in microturbines could vastly improve their current fuel efficiency. This thesis focuses on developing a compact, single stage 8:1 pressure ratio centrifugal compressor stage designed to meet the high-pressure ratio requirements of microturbines and small gas turbine engines in turbo hybrid-electric propulsion applications. The first stage vaned diffuser was modified to include a scalloped leading edge ridge to aid stage total-total compression efficiency improvement. A full 3D Navier-Strokes based CDF solver was used in estimating the delta increase in device total-total efficiency due to scalloped leading edge, from the baseline configuration. The solution obtained using CFD was also used to investigate the ameliorating effects of the scallop ridge.
Book Synopsis Design and Development of Advanced Vaned Diffusers for Centrifugal Compressors by : Naresh Kumar Amineni
Download or read book Design and Development of Advanced Vaned Diffusers for Centrifugal Compressors written by Naresh Kumar Amineni and published by . This book was released on 1996 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Development of Low Solidity Vaned Diffusers for Centrifugal Compressors by : Won Joong Kim
Download or read book Design and Development of Low Solidity Vaned Diffusers for Centrifugal Compressors written by Won Joong Kim and published by . This book was released on 1998 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance of a Low-pressure-ratio Centrifugal Compressor with Four Diffuser Designs by : Hugh A. Klassen
Download or read book Performance of a Low-pressure-ratio Centrifugal Compressor with Four Diffuser Designs written by Hugh A. Klassen and published by . This book was released on 1973 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Influence of Diffuser Vane Leading Edge Geometry on the Performance of a Centrifugal Compressor by : W. W. Clements
Download or read book The Influence of Diffuser Vane Leading Edge Geometry on the Performance of a Centrifugal Compressor written by W. W. Clements and published by . This book was released on 1989 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theoretical and Experimental Investigation of the Flow at the Inlet of the Vaned Diffuser by : G. Verdonk
Download or read book Theoretical and Experimental Investigation of the Flow at the Inlet of the Vaned Diffuser written by G. Verdonk and published by . This book was released on 1978 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance Assessment of Radial Vaneless Diffusers for Centrifugal Compressors by : Fahed A. N. AL-Awaidy
Download or read book Performance Assessment of Radial Vaneless Diffusers for Centrifugal Compressors written by Fahed A. N. AL-Awaidy and published by . This book was released on 1998 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of Exit-vaned Diffusers on Centrifugal-compressor Performance by : Frank Florian Szczesny
Download or read book The Effect of Exit-vaned Diffusers on Centrifugal-compressor Performance written by Frank Florian Szczesny and published by . This book was released on 1962 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of Diffuser Hub Injection to Improve Centrifugal Compressor Stability by : Gary J. Skoch
Download or read book Experimental Investigation of Diffuser Hub Injection to Improve Centrifugal Compressor Stability written by Gary J. Skoch and published by BiblioGov. This book was released on 2013-07 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results from a series of experiments to investigate whether centrifugal compressor stability could be improved by injecting air through the diffuser hub surface are reported. The research was conducted in a 4:1 pressure ratio centrifugal compressor configured with a vane-island diffuser. Injector nozzles were located just upstream of the leading edge of the diffuser vanes. Nozzle orientations were set to produce injected streams angled at 8, 0 and +8 degrees relative to the vane mean camber line. Several injection flow rates were tested using both an external air supply and recirculation from the diffuser exit. Compressor flow range did not improve at any injection flow rate that was tested. Compressor flow range did improve slightly at zero injection due to the flow resistance created by injector openings on the hub surface. Leading edge loading and semi-vaneless space diffusion showed trends similar to those reported earlier from shroud surface experiments that did improve compressor flow range. Opposite trends are seen for hub injection cases where compressor flow range decreased. The hub injection data further explain the range improvement provided by shroud-side injection and suggest that different hub-side techniques may produce range improvement in centrifugal compressors.
Author :North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development Publisher : ISBN 13 : Total Pages :312 pages Book Rating :4.0/5 ( download)
Book Synopsis Advanced Compressors by : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development
Download or read book Advanced Compressors written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1970 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of Channel Vaned Diffuser of Centrifugal Compressor Under Variable Conditions by : N. N. Bukharin
Download or read book Investigation of Channel Vaned Diffuser of Centrifugal Compressor Under Variable Conditions written by N. N. Bukharin and published by . This book was released on 1967 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: In centrifugal high-pressure compressors, considerable losses occur in the vaned or ducted diffusor for transforming kinetic into potential energy which is located directly behind the impeller. These losses considerably lower diffusor efficiency. Analysis of the effect of the diffusor geometry on its efficiency was made. It was concluded that minimum losses in the ducts of a vaned diffusor occur at minimum flow rates, while minimum losses in the flow through the impeller occur at maximum flow rates. The diffusor should therefore be designed to minimize the overall losses in both elements. (Author).
Book Synopsis Radial Flow Turbocompressors by : Michael Casey
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.
Book Synopsis Numerical Flow Analysis in a Subsonic Vaned Radial Diffuser with Leading Edge Redesign by : E. Casartelli
Download or read book Numerical Flow Analysis in a Subsonic Vaned Radial Diffuser with Leading Edge Redesign written by E. Casartelli and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented at the International Gas Turbine & Aeroengine Congress & Exhibition, Orlando, FL, Jun 2 - Jun 5, 1997.
Book Synopsis Test Evaluation of Stationary and Rotating Diffusers for a High Pressure Ratio Radial Compressor by : Colin Rodgers
Download or read book Test Evaluation of Stationary and Rotating Diffusers for a High Pressure Ratio Radial Compressor written by Colin Rodgers and published by . This book was released on 1977 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design of a free rotating vaneless/vaned diffuser (F.R.D.) for a nominal 1.9 pps, high pressure ratio, single stage radial compressor was completed, together with a comparative conventional stationary vaneless/vaned optimum channel diffuser. Both types of diffuser were subsequently fabricated and individually installed in an existing turbodrive compressor rig for comparative performance evaluation. At 100% corrected design impeller speed, equal to 62,000 rpm, the peak pressure ratio and adiabatic efficiency for the stationary and F.R.D. systems were 7.91 and 72.6% compared to 7.43 and 70%, respectively. Impeller efficiency was not repeatable and reduced 3.8% at design speed with the F.R.D. installed, probably as a result of different radial clearance settings. Overall peak vaneless/vaned diffuser static pressure recovery was essentially the same (0.61) at design speed with either the stationary or F.R.D. systems. (Author).
Book Synopsis Investigation of Stall Inception in Centrifugal Compressors Using Isolated Diffuser Simulations by : Jonathan Neil Everitt
Download or read book Investigation of Stall Inception in Centrifugal Compressors Using Isolated Diffuser Simulations written by Jonathan Neil Everitt and published by . This book was released on 2010 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: In compression systems the range of stable operating is limited by rotating stall and/or surge. Two distinct types of stall precursors can be observed prior to these phenomena: the development of long-wavelength modal waves or a short-wavelength, three-dimensional ow breakdown which is typically known as a "spike". The cause of the latter is not well understood; in axial machines it has been suggested that over-tip spillage ow has a significant role, but spikes can also occur in shrouded vaned diffusers of centrifugal compressors, where these flows are not present, suggesting an alternative mechanism may be at play. Unsteady Reynold's Averaged Navier-Stokes simulations are performed for an isolated vaned radial diffusers from a highly loaded centrifugal compressor. Key to their success is the definition of pitchwise "mixed out" averaged inlet conditions derived from the impeller exit flow field from separate single passage stage calculations. This guarantees the relevant flow features are carried into the diffuser model, particularly the spanwise profile of flow angle and total pressure. It is shown that the isolated diffuser model compares well with experimental data and time-averaged, unsteady, full wheel simulations. The stability of the flow is tested via numerical forced response experiments whereby the inlet conditions are perturbed by a total pressure forcing small in temporal and spatial extent. An unstable rotating stall precursor is observed at low diffuser inlet corrected flow, due to the spanwise non-uniform flow angle and total pressure at the diffuser inlet. The radial pressure gradient imposed by the highly swirling bulk flow leads to flow angles in excess of 90 in the shroud endwall flow. This results in shroud-side separation at the diffuser vane leading edge and a region of recirculating ow in the vaneless space. Vorticity shed from the diffuser vane leading edge convects back to the vaneless space and joins the vortical structures within the recirculating flow. This is suggested to lead to spike stall inception.
Author :North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development Publisher : ISBN 13 : Total Pages : pages Book Rating :4.3/5 (126 download)
Book Synopsis AGARD Lecture Series by : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development
Download or read book AGARD Lecture Series written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Paper written by and published by . This book was released on 1968 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:
