Due to the influence of the marine environment, marine gas turbine lubricants
are required to have good thermal conductivity. However, the current
research on marine gas turbine lubricants mainly focuses on its corrosion
resistance. Therefore, a real-time numerical simulation of thermal
conductivity of marine gas turbine lubricating oil under complex sea
conditions is proposed. In this paper, the turbulent kinetic energy
equation and the loss transport equation are obtained by introducing the
turbulent column and the k-e model. The Nusselt number in the k-e model can
be regarded as the ratio of convective heat transfer between fluid and
solid wall and internal heat transfer of fluid. According to the equations,
the transient heat transfer model of vertical moving contact parts is
established, and the heat transfer relationship between lubricating oil and
plug group is obtained. The experimental results show that the area of low
temperature in this scheme is larger than that in the traditional scheme,
which means that the efficiency of impingement cooling is improved after the
introduction of the pin structure in the impingement cooling design. The
heat transfer process on the suction surface is stronger than that on the
pressure surface, and the heat transfer coefficient of the blade increases
continuously, reaching the local maximum value at about X/L = 0.65.
A design of microstrip array antenna for ETC (Electronic Toll Collection) applications is presented. The antenna is designed and realized at the center frequency of 5.835 GHz, and consists of 32 microstrip patches (4×8). Furthermore, the proposed antenna is series-fed, so it is easy to manufacture and the cost is relatively low. The simulated and measured results agree very well.
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