Rotation Effect on Flow and Heat Transfer for High-Temperature Rotor Blade in a Heavy Gas Turbine
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https://doi.org/10.1007/s11630-020-1319-x
Article ID: 1003-2169(2020)00-0000-00
Rotation Effect on Flow and Heat Transfer for High-Temperature Rotor Blade in a Heavy Gas Turbine DONG Aihua1,2, YAN Peigang1*, QIAN Xiaoru1, HAN Wanjin1, WANG Qingchao1 1. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China 2. Harbin Turbine Company Limited, Harbin 150046, China © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: In this paper, the composite inner cooling structures of the rotating blade in the first stage heavy gas turbine were modeled and simulated by coupling heat transfer (CHT). The flow characteristics and heat transfer performances were comparatively analyzed under two operations of the stationary and the rotational states. The results show that the turbulence intensity, the flow resistance and the heat transfer level of the rotating coolant are significantly increased compared with the stationary state, which is considered to be obtained by the combined effects of the Coriolis force, the centrifugal force and their derived buoyancy forces. It is pointed out that the rotation leads to the non-uniform flow of film holes at the leading edge of the pressure surface along blade height. In addition, it increases the slope of the limiting streamline, which has a decisive influence on the heat transfer of both the pressure and suction surfaces. The paper provides guidance for the design of a rotating composite cooling structure based on the relations between the stationary and rotational conditions.
Keywords: heavy gas turbine, composite cooling structure, coupled heat transfer, rotation effect, simulation
1. Introduction One of the key parameters for the design of the high-performance gas turbine is the increase of turbine inlet temperature, which has reached up to 1800 K‒ 2050 K and seriously exceeds the limiting temperature of heat-resistant blade material. Therefore, efficient cooling technology is urgently needed to ensure the lifespan and safety of the high-temperature gas turbine. The Coriolis force, which is affected by the flow direction of the coolant and the direction of rotation, has different effects on the heat transfer for the radial inflow and the radial outflow channel [1, 2]. The rotation has stronger effects on the first passage than the second passage in a rotating two-pass channel [3]. Detailed analysis of the flow field characteristics and heat transfer performances of Received: Feb 27, 2019
AE: HEUY DONG Kim
rotational state contributes to optimizing the cooling structure of air-cooled turbine blades, thereby improving the performance of the turbine. In the real turbine blade, the internal cooling passage is composed of serpentine passage, with the turn of 180°, radially inward flow channel and radially outward flow channel. Chu et al. [4], Lei et al. [5], Chen et al. [6] and Chen et al. [7] investigated the effect of turning vane on heat transfer and flow in a multi-pa
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