NDLI: Flow development through HP & LP turbines, Part II: Effects of the hub endwall secondary sealing air flow on the turbine’s mainstream flow

Content Provider	Springer Nature Link
Author	Hu, Jialin Du, Qiang Liu, Jun Wang, Pei Liu, Guang Liu, Hongrui Du, Meimei
Copyright Year	2017
Abstract	Although many literatures have been focused on the underneath flow and loss mechanism, very few experiments and simulations have been done under the engines’ representative working conditions or considering the real cavity structure as a whole. This paper aims at realizing the goal of design of efficient turbine and scrutinizing the velocity distribution in the vicinity of the rim seal. With the aid of numerical method, a numerical model describing the flow pattern both in the purge flow spot and within the mainstream flow path is established, fluid migration and its accompanied flow mechanism within the realistic cavity structure (with rim seal structure and considering mainstream & secondary air flow’s interaction) is used to evaluate both the flow pattern and the underneath flow mechanism within the inward rotating cavity. Meanwhile, the underneath flow and loss mechanism are also studied in the current paper. The computational results show that the sealing air flow’s ingestion and ejection are highly interwound with each other in both upstream and downstream flow of the rim seal. Both the down-stream blades’ potential effects as well as the upstream blades’ wake trajectory can bring about the ingestion of the hot gas flow within the cavity, abrupt increase of the static pressure is believed to be the main reason. Also, the results indicate that sealing air flow ejected through the rear cavity will cause unexpected loss near the outlet section of the blades in the downstream of the HP rotor passages.
Starting Page	308
Ending Page	315
Page Count	8
File Format	PDF
ISSN	10032169
Journal	Journal of Thermal Science
Volume Number	26
Issue Number	4
e-ISSN	1993033X
Language	English
Publisher	Science Press
Publisher Date	2017-07-19
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Turbines Sealing air Flow pattern Classical and Continuum Physics Engineering Fluid Dynamics Engineering Thermodynamics, Heat and Mass Transfer
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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