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Titolo:
Direct method for optimization of a centrifugal compressor vaneless diffuser
Autore:
Lee, YT; Luo, L; Bein, TW;
Indirizzi:
USN, Surface Warfare Ctr, Carderock Div, W Bethesda, MD 20817 USA USN W Bethesda MD USA 20817 Ctr, Carderock Div, W Bethesda, MD 20817 USA Penn State Univ, University Pk, PA 16801 USA Penn State Univ University Pk PA USA 16801 v, University Pk, PA 16801 USA USN, Surface Warfare Ctr, Annapolis Detachment, Annapolis, MD 21402 USA USN Annapolis MD USA 21402 Annapolis Detachment, Annapolis, MD 21402 USA
Titolo Testata:
JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME
fascicolo: 1, volume: 123, anno: 2001,
pagine: 73 - 79
SICI:
0889-504X(200101)123:1<73:DMFOOA>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
15
Recensione:
Indirizzi per estratti:
Indirizzo: Lee, YT USN, Surface Warfare Ctr, Carderock Div, W Bethesda, MD 20817 USA USN W Bethesda MD USA 20817 rderock Div, W Bethesda, MD 20817 USA
Citazione:
Y.T. Lee et al., "Direct method for optimization of a centrifugal compressor vaneless diffuser", J TURBOMACH, 123(1), 2001, pp. 73-79

Abstract

A Direct Method for Optimization (DMO) is developed for investigating pressure rise and energy loss in a vaneless diffuser of a generic compressor used in shipboard air-conditioning systems. The scheme uses Reynolds-AveragedNavier-Stokes (RANS) results and evaluates gradients of a predetermined objective function. The current Direct Method for Optimization differs from the popular Inverse Design Method in the process of obtaining final configurations and in the final configurations obtained. The Direct Method for Optimization achieves a final shape from maximizing/minimizing a nonlinear function, i.e., the objective function. Both gradient and nongradient Direct Methods for Optimization are compared with respect to accuracy and efficiency. The coupled DMO/RANS optimization code is benchmarked using a plane turbulent diffuser also investigated by Zhang et al. using an adjoint method. The benchmark indicates that ifa global optimum exists, the result should be independent of the methodologies or design parameters used. The DMO/RANS method is applied to redesign a three-dimensional centrifugal vaneless diffuser used in a modem generic compressor. The objective function is a composite function of the diffuser's pressure rise and total energy loss. The new optimum diffuser has a minimum width at a location far beyond the conventional diffuser pinch point. The new diffuser also provides an efficient section for pressure recovery, which takes place after the minimum width location. Test data for the new diffuser validate the current approach at the design condition. Furthermore, improved performance is also recorded experimentally at off-design conditions for the optimized diffuser.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 17:25:43