NDLI: Numerical Study on Influencing Factors of Film Cooling on Turbine Blade Leading Edge Under Rotating State

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Numerical Study on Influencing Factors of Film Cooling on Turbine Blade Leading Edge Under Rotating State

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Ma, Yiwen Li, Haiwang Yang, Meisong Wu, Min Zhou, Huimin
Copyright Year	2018
Abstract	Engine turbine blades operate at a high speed of rotation and are subjected to high temperature and pressure prevailing gas from the combustion chamber, making the working condition very harsh. In particular, the leading edge of the blade, which is directly subjected to high-temperature gas impacts, is the hottest part of the turbine. Therefore, it is of great importance to improve the protection of the blade leading edge and enhance the understanding of this part of the flow field and temperature field. This paper will focus on the phenomenon of wake deflection and study the film cooling characteristics of the turbine blade under rotating condition. The characteristics of pressure surface and suction surface of the blade are verified by numerical simulation. The contents cover the influence of the film hole diameter, pitch, blowing ratio, rotation number and the development process, the film cooling efficiency on the outflow of coolant film. The result shows that Coriolis force, centrifugal force and secondary flow induced by rotation will change the mainstream flow along the blade, which will lead to changes of pattern concerning the development of the film on the blade surface. In the process of wake development, deflection occurs in different directions at different positions, and the greater the rotation number is, the more obvious the degree of deflection will be. Studying the model with film holes on the leading edge of the blade, these phenomena can be observed along the downstream on the pressure and suction surfaces. Also, models with film holes independently set on the pressure and suction surfaces can be used as proof of these features. At the same time, this paper studies the flow and heat transfer characteristics of the leading-edge gas film under rotating condition and focuses on the influence of rotation on the outflow and the development processes of the wake. The gas film cooling models in rotating state of different film hole diameters and film hole radial spacing will also be compared to further understand the flow and heat transfer characteristics of film cooling on the leading edge of the blade.
File Format	PDF
ISBN	9780791852125
DOI	10.1115/IMECE2018-87258
Volume Number	Volume 8B: Heat Transfer and Thermal Engineering
Conference Proceedings	ASME 2018 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2018-11-09
Publisher Place	Pittsburgh, Pennsylvania, USA
Access Restriction	Subscribed
Subject Keyword	Suction Temperature Turbine blades Blades Deflection Computer simulation Coriolis force High temperature Flow (dynamics) Rotation Pressure Engines Wakes Outflow Centrifugal force Coolants Film cooling Combustion chambers Heat transfer Turbines
Content Type	Text
Resource Type	Article

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