Full conjugate heat transfer modelling for steam turbines in transient operations
Full conjugate heat transfer modelling for steam turbines in transient operations
复制标题
瞬态运行中汽轮机的全共轭传热建模
DOI:
10.1016/j.ijthermalsci.2017.10.025
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发表时间:
2018
影响因子:
4.5
通讯作者:
Fadl M
中科院分区:
文献类型:
--
作者:
Fadl M
Steam turbines are increasingly required to operate more flexibly, leading to a need for more detailed calculations and design considerations of the thermal conditions during transient operations. A major challenge in transient thermal designs is the time scale disparity. For the natural cooling of a turbine, the physical process is typically in hours or tens of hours, but on the other hand, the time step sizes typically usable tend to be very small, in seconds or sub-seconds, due to the numerical stability requirement for natural convection as often encountered.The present paper reports a validation and demonstration study of a new loosely coupled conjugate heat transfer (CHT) approach developed for efficient and accurate simulations of steam turbine transient operations (Shut-down/Natural cooling). The verification and validation have been carried out for a complex 3D geometry configuration with attributes of realistic but geometrically simplified full-scale steam turbines and compared with a well-established simplified working method backed up by experimental data. Further comparisons are made against a direct baseline CHT method. The present results demonstrate a generally good agreement with the simplified working method. The new loosely coupled method is shown to give a marked speed-up (by a factor of 240) compared to the baseline directly coupled method with the same accuracy. It thus offers the potential for significant improvement in predicting the long-duration transient natural convection conjugate heat transfer problems of steam turbines in terms of computational efficiency and accuracy.
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DOI:
10.1115/gt2012-68703
发表时间:
2012
期刊:
Procedia Engineering
影响因子:
--
作者:
W. Mohr;P. Ruffino
通讯作者:
P. Ruffino
DOI:
10.1115/1.4031643
发表时间:
2015
影响因子:
1.5
作者:
Monika Topel;M. Jöcker;Sayantan Paul;Björn Laumert
通讯作者:
Björn Laumert
DOI:
10.1115/gt2012-68759
发表时间:
2012
期刊:
Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy
影响因子:
--
作者:
G. Marinescu;A. Ehrsam
通讯作者:
A. Ehrsam
DOI:
10.1115/1.4030411
发表时间:
2015
影响因子:
1.5
作者:
G. Marinescu;P. Stein;M. Sell
通讯作者:
M. Sell
DOI:
10.1115/1.4025556
发表时间:
2014
影响因子:
1.5
作者:
G. Marinescu;W. Mohr;A. Ehrsam;P. Ruffino;M. Sell
通讯作者:
M. Sell