Network analysis of a coolant flow performance for the combined impingement and film cooled first-stage of high pressure gas turbine nozzle guide vane

Kukutla, Pol Reddy; Prasad, B. V. S. S. S.

doi:10.1177/0954410018767290

Cited by 3 publications

(2 citation statements)

References 26 publications

(29 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In other aspects, some scholars employed a commercial 1D flow solver that has a library for SAS elements to model geometric details. For example, Alexiou 6 established models of SAS elements in PROOSIS ® that allow the creation of SAS configurations in a flexible manner; Kukutla et al 7 used Flownex ® to perform a thermo-fluid-dynamic network analysis of a typical turbine nozzle guide vane with combined impingement and film cooling technique.…”

Section: Introductionmentioning

confidence: 99%

Turbofan engine performance prediction methodology integrated high-fidelity secondary air system models

Yang

Jian

Dong

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

This research studies the performance of an ultra-high bypass ratio turbofan engine, and specifically its secondary air system (SAS). A co-simulation methodology is explored whereby a high-fidelity SAS model and an engine performance code featuring flexible modules can be coupled and interactively executed. The percentage of bleed flows and boundary conditions for the SAS are updated at each iteration step. For this purpose, a SAS model including different elements is developed. Furthermore, a commercial computational fluid dynamics (CFD) solver is adopted to capture the complex flow field in the pre-swirl system. The credibility of cycle calculation and SAS elements is validated by comparing with publicly available data. Subsequently, an elaborately designed SAS is modeled and co-simulated with the AGTF30 engine using a flow network simulation method. The coupling effect between the engine performance and the SAS is studied for eight different flight conditions. The correlation and prediction of engine performance due to seal clearance change is presented. The co-simulation approach clarifies the mutual interactions between the engine overall parameters and the SAS. The results reveal that the enhanced flow network model can improve the simulation accuracy of engine performance over a wide range of operating conditions.

show abstract

Section: Introductionmentioning

confidence: 99%

Turbofan engine performance prediction methodology integrated high-fidelity secondary air system models

Yang

Jian

Dong

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part G:

View full text Add to dashboard Cite

show abstract

“…Rubini [1] describes such a network methodology for combustor preliminary design and these methods continue to be used. With more complex cooling strategies in cooling tiles or turbine blades, similar approaches are used in cooling circuits, such as within turbine blades as in Kukutla and Prasad [2], for example, where several hundred discharge coefficients are required to determine the network flow solution. Even in the detailed design phases, the CFD model requires at least some validation because air admission ports present their own difficulties to performing accurate predictions with a wide range of flow scales that require capturing.…”

Section: Introductionmentioning

confidence: 99%

Discharge Coefficients of Ports with Stepped Inlets

Spencer

2018

Aerospace

View full text Add to dashboard Cite

Components of aeronautical gas turbines are increasingly being constructed from two layers, including a pressure containing skin, which is then protected by a thermal tile. Between them, pedestals and/or other heat transfer enhancing features are often employed. This results in air admission ports through the dual skin having a step feature at the inlet. Experimental data have been captured for stepped ports with a cross flow approach, which show a marked increase of 20% to 25% in discharge coefficient due to inlet step sizes typical of combustion chamber configurations. In this respect, the step behaves in a fashion comparable to ports with inlet chamfering or radiusing; the discharge coefficient is increased as a result of a reduction in the size of the vena contracta brought about by changes to the flow at inlet to the port. Radiused and chamfered ports have been the subject of previous studies, and empirical correlations exist to predict their discharge coefficient as used in many one-dimensional flow network tools. A method to predict the discharge coefficient change due to a step is suggested: converting the effect of the step into an equivalent radius to diameter ratio available in existing correlation approaches. An additional factor of eccentricity between the hole in the two skins is also considered. Eccentricity is shown to reduce discharge coefficient by up to 10% for some configurations, which is more pronounced at higher port mass flow ingestion fraction.

show abstract

Optimization of film hole row locations of a nozzle guide vane using network approach

Kukutla

Prasad

Tarigonda³

et al. 2020

J Therm Anal Calorim

View full text Add to dashboard Cite

Network analysis of a coolant flow performance for the combined impingement and film cooled first-stage of high pressure gas turbine nozzle guide vane

Cited by 3 publications

References 26 publications

Turbofan engine performance prediction methodology integrated high-fidelity secondary air system models

Turbofan engine performance prediction methodology integrated high-fidelity secondary air system models

Discharge Coefficients of Ports with Stepped Inlets

Optimization of film hole row locations of a nozzle guide vane using network approach

Contact Info

Product

Resources

About