In this paper, a fluid-thermal coupled finite element model is established
according to the design parameters of dry type air core reactor. The
detailed temperature distribution can be achieved, the maximum error
coefficient of temperature rise is only 6% compared with the test results of
prototype, and the accuracy of finite element calculate method is verified.
Taking the equal height and heat flux design parameters of reactor as
research object, the natural convection cooling performance of reactor with
and without the rain cover is investigated. It can be found that the
temperature rise of reactor is significantly increased when adding the rain
cover, and the reasons are given by analyzing the fluid velocity
distribution of air dcuts between the encapsulation coils. In order to
reduce the temperature rise of the reactor with the rain cover, the
optimization method based on the orthogonal experiment design and finite
element method is proposed. The six factors of the double rain cover are
given, which mainly affect the temperature rise of reactor, and the five
levels are selected, the influence curve and contribution rate of each
factor on the temperature rise of reactor are analyzed. The results show
that the contribution ratio of the parameter H1, L1 and L2, are obviously
higher than the parameter H2, L3 and ?, so the more attention should be paid
in the design of double rain cover. Meanwhile, the optimal structural
parameters of rain cover are given based on the influence curves, and the
temperature rise is only 43.25?C. The results show that the optimization
method can reduce the temperature rise of reactor significantly. In
addition, the temperature distribution of inner encapsulations coils of
reactor are basically the same, the current carrying capacity of coils can
be fully utilized, which provides an important guidance for the optimization
design of reactor.
Thermal and Electromagnetic Combined Optimization Design of Dry Type Air Core Reactor