Volume 7: Turbomachinery, Parts A, B, and C 2010
DOI: 10.1115/gt2010-23604
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Computational Study of Geometric Parameter Influence on Aggressive Inter-Turbine Duct Performance

Abstract: Modern direct-drive turbofan engines typically have the fan turbine designed at significantly higher diameter than the gas producer turbine. Furthermore, the gas turbine industry is being pushed to shorten engine length with the goal of reducing weight. This results in a need to design very aggressive inter-turbine-ducts (ITD’s) that have high endwall slopes. The gas turbine design cycle typically begins with conceptual design where many engine configuration iterations are made. During conceptual design, there… Show more

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Cited by 10 publications
(3 citation statements)
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“…They carried out detailed experimental research on three types of linear diffusers, and uncovered the relationship between the inlet-to-outlet area ratio and length to height ratio in order to maximum the static pressure lift. However, (Couey et al, 2010) pointed out that the design scope of ITD today is quite different from the experimental data of (Sovran and Klomp, 1967), and supplemented the influence of mean rise angle on aggressive ITD performance.…”
Section: Introductionmentioning
confidence: 99%
“…They carried out detailed experimental research on three types of linear diffusers, and uncovered the relationship between the inlet-to-outlet area ratio and length to height ratio in order to maximum the static pressure lift. However, (Couey et al, 2010) pointed out that the design scope of ITD today is quite different from the experimental data of (Sovran and Klomp, 1967), and supplemented the influence of mean rise angle on aggressive ITD performance.…”
Section: Introductionmentioning
confidence: 99%
“…This adverse pressure gradient is caused by a combination of flow diffusion and flow turning [15,16]. Based on this understanding, researchers have summarized two global parameters, area ratio (AR) and length-to-offset ratio (LOR), which are the key contributing factors that affect the flow separation features in the S-shaped diffuser [17]. The AR, which is the ratio of the outlet to inlet areas, is the contributing factor of flow diffusion.…”
Section: Introductionmentioning
confidence: 99%
“…After being investigated for years, the flow mechanisms of the aggressive intermediate turbine duct (AITD) have been described systematically. 13 Complicated pressure gradients along stream-wise and span-wise, as well as upstream flow characteristics, for example, geometry, 4,5 swirl angle, 68 produce complicated flow field in the duct. In addition to that, an important feature is the rotor-blade tip-leakage flow.…”
Section: Introductionmentioning
confidence: 99%