Browsing by Author "Yang, Yimin"

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    Gas turbine engine transient performance and heat transfer effect modelling: a comprehensive review, research challenges, and exploring the future
    (Elsevier, 2023-09-12) Yang, Yimin; Nikolaidis, Theoklis; Jafari, Soheil; Pilidis, Pericles
    Gas turbine transient simulation is an important tool in analysing engine performance during changes in operating conditions. This paper provides a comprehensive review of the development of gas turbine transient simulation, heat transfer effect on transient performance and transient simulation platforms over the past 70 years. The paper highlights the various methods used for gas turbine overall transient simulation, including white box approach, black box approach and numerical approach, and the development of models for heat transfer effects, including heat soakage, tip clearance, and component characteristic changes. Besides, the development of gas turbine transient simulation platforms has been included. Challenges that need to be addressed to achieve more accurate simulations are identified. For white and black box approaches, complex engine dynamics phenomena and heat transfer effects urge the development of methodologies. For the numerical approach, the high computational and geometry demand for the full-size gas turbine transient model slows the CFD application in gas turbine overall transient simulation. For heat transfer effect simulation, the increasing complexity of engine structures and cooling techniques urges the development of a more realistic heat soakage model. The paper suggests that the white box approach can benefit from a method that accurately models several thermal dynamics. The black box methodologies should consider the heat transfer effect during the modelling and training. And more attention should be paid to the full-size gas turbine transient model development. Additionally, the paper recommends the development of a more complete heat transfer model that includes axial clearance effects, detailed combustor heat transfer models, and advanced component maps.
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    Quasi-2D thermal network based heat soakage model for gas turbine transient performance modification
    (Elsevier, 2024-01-09) Yang, Yimin; Nikolaidis, Theoklis; Pilidis, Pericles
    To overcome the limitations of traditional heat soakage analysis, a novel quasi-2D thermal network based heat soakage model is established with the consideration of component internal thermal resistance, combustor temperature profile, cooling technologies and thermal barrier coating. The method has been integrated into Turbomatch, a gas turbine performance software developed by Cranfield University, to offer a more realistic estimation of the heat soakage effect during the gas turbine transient manoeuvre. The accuracy of the heat soakage model has been validated against results obtained from GasTurb. Furthermore, a parametric analysis has been conducted to evaluate the effects of combustor temperature profile, cooling technologies, and thermal barrier coating. It is found that the combustor temperature profile will cause a significant increase in heat flow rate, which is approximately four times the conventional lumped parameter method based model. The implementation of cooling technologies and thermal barrier coating will reduce the heat flow rate by 48.97%. More importantly, the change in heat flow rate causes a further delay in engine transient response. Corrected rotational speed was decreased by 0.89%, and thrust was reduced by 2.24%. Moreover, a delay of 8s (233% increase) in the transient acceleration time was found when comparing the quasi-2D thermal network based heat soakage model with the traditional lumped parameter method based model. These highlight the significance of accurately evaluating the heat soakage effects during gas turbine transient simulation.