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Controlled accelerated cooling of R350HT head
hardened rail joints immediately after their welding is critical in
order to secure that these joints have similar mechanical
properties with the rest of the rail. In practice this accelerated
cooling can be achieved by sending forced air through an
apparatus placed over the welded area of the rail joint just after
welding operation. The apparatus should be designed in a way to
create homogenous and effective cooling around the railhead. For
this purpose, airflow and cooling simulations were performed in
order to optimize the design of such apparatus. Number and
diameter of air nozzles, their positions, nozzle-to-rail surface
distance and airflow rate were employed as the main input
parameters for the simulations performed using ANSYS 15
(thermal and fluid flow). The main focus was on finding the design
and operation parameters that give homogenous air flow around
the rail head which in turn would produce uniform cooling. In this
publication, the results of the simulations run under various
conditions will be compared and an optimum set of design and
operating parameters will be offered.
International Iron & Steel Symposium
UDCS
Nizar Ramadan
Kazım Tur
Erkan Konca