Axial Turbine Performance Evaluation. Part B—Optimization With and Without ConstraintsSource: Journal of Engineering for Gas Turbines and Power:;1968:;volume( 090 ):;issue: 004::page 349DOI: 10.1115/1.3609212Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The maximum obtainable efficiency and associated geometry have been calculated based on the use of generalized loss correlations from Part A and are presented for full and partial admission turbines over a wide range of specific speeds. The calculated effects of varying values of Reynolds number, tip clearance, and trailing edge thickness on turbine performance are presented. Because of the anticipated difficulty in fabricating some of the optimum geometries calculated, the effects of using nonoptimum values of geometric parameters on attainable efficiency have also been investigated. The derating factor for machine Reynolds number is shown to be a strong function of specific speed, varying from 0.96 at a specific speed of 100, to 0.6 at a specific speed of 3, when Reynolds number is 105 compared to a reference value of 106 . The derating factor for tip clearance is shown to be similar to what would be expected if the clearance area were considered as a leakage area. The use of blade heights, blade numbers, rotor exit angles, and degrees of reaction varying from the optimum by 25 percent produce maximum derating factors of 0.99, 0.98, 0.985, and 0.97, respectively, when compared to full optimum values.
keyword(s): Optimization , Turbines , Performance evaluation , Reynolds number , Clearances (Engineering) , Blades , Geometry , Thickness , Leakage , Rotors AND Machinery ,
|
Show full item record
contributor author | O. E. Baljé | |
contributor author | R. L. Binsley | |
date accessioned | 2017-05-09T00:05:40Z | |
date available | 2017-05-09T00:05:40Z | |
date copyright | October, 1968 | |
date issued | 1968 | |
identifier issn | 1528-8919 | |
identifier other | JETPEZ-26671#349_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/125689 | |
description abstract | The maximum obtainable efficiency and associated geometry have been calculated based on the use of generalized loss correlations from Part A and are presented for full and partial admission turbines over a wide range of specific speeds. The calculated effects of varying values of Reynolds number, tip clearance, and trailing edge thickness on turbine performance are presented. Because of the anticipated difficulty in fabricating some of the optimum geometries calculated, the effects of using nonoptimum values of geometric parameters on attainable efficiency have also been investigated. The derating factor for machine Reynolds number is shown to be a strong function of specific speed, varying from 0.96 at a specific speed of 100, to 0.6 at a specific speed of 3, when Reynolds number is 105 compared to a reference value of 106 . The derating factor for tip clearance is shown to be similar to what would be expected if the clearance area were considered as a leakage area. The use of blade heights, blade numbers, rotor exit angles, and degrees of reaction varying from the optimum by 25 percent produce maximum derating factors of 0.99, 0.98, 0.985, and 0.97, respectively, when compared to full optimum values. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Axial Turbine Performance Evaluation. Part B—Optimization With and Without Constraints | |
type | Journal Paper | |
journal volume | 90 | |
journal issue | 4 | |
journal title | Journal of Engineering for Gas Turbines and Power | |
identifier doi | 10.1115/1.3609212 | |
journal fristpage | 349 | |
journal lastpage | 359 | |
identifier eissn | 0742-4795 | |
keywords | Optimization | |
keywords | Turbines | |
keywords | Performance evaluation | |
keywords | Reynolds number | |
keywords | Clearances (Engineering) | |
keywords | Blades | |
keywords | Geometry | |
keywords | Thickness | |
keywords | Leakage | |
keywords | Rotors AND Machinery | |
tree | Journal of Engineering for Gas Turbines and Power:;1968:;volume( 090 ):;issue: 004 | |
contenttype | Fulltext |