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International journal of heat and mass transfer v.121, 2018년, pp.952 - 966   SCI SCIE
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

Effects of the swirling coolant jet from the upstream slot on the vane endwall cooling and the vane suction side phantom cooling

Du, Kun (Institute of Turbomachinery, Xi'an Jiaotong University, Xi'an 710049, China ) ; Li, Zhigang (Institute of Turbomachinery, Xi'an Jiaotong University, Xi'an 710049, China ) ; Li, Jun (Institute of Turbomachinery, Xi'an Jiaotong University, Xi'an 710049, China ) ; Sunden, Bengt (Division of Heat Transfer, Department of Energy Sciences, Lund University, Lund SE-22 100, Sweden ) ;
  • 초록  

    Abstract In order to obtain a higher thermal efficiency, the inlet temperature of gas turbines is gradually increased. However, this increases the thermal load on the first stage vane endwall surface. Therefore, an advanced cooling technique must be implemented for the endwall cooling to ensure that the gas turbine operates safely. In the current study, effects of swirling coolant flow from the upstream slot on the endwall cooling and vane suction side surface phantom cooling were numerically investigated on basis of a validated numerical method. Three-dimensional (3D) Reynolds-averaged Navier–Stokes (RANS) equations combined with the shear stress transport (SST) k - ω turbulence model were solved in the numerical simulations. The results indicate that the endwall cooling and the phantom cooling are significantly influenced by introducing a swirling coolant jet from the upstream slot relative to the baseline. Compared with the baseline case and the negative swirling coolant jet angle, the positive swirling coolant jet angle contributes to increase the overall uniformity of the endwall cooling effectiveness and reduce the hot region along the pressure side, especially for the case with α = 20°. However, it obtains a relatively low level of the phantom cooling effectiveness on the vane suction side. In contrast, the negative swirling coolant jet angle attains a higher level of phantom cooling effectiveness on the vane suction side relative to the positive swirling coolant jet angle. The case with α = −20° obtains the largest phantom cooling effectiveness on the vane suction side. In addition, the aerodynamic loss is increased within a small range. The largest total pressure loss coefficient is 5% for the case with α = −30° among all investigated cases. Highlights The swirling coolant jet are introduced to the upstream slot. Effects of the swirling coolant jet are numerically investigated. Swirling coolant jet enhances overall cooling effectiveness. A large coolant swirling ratio reduces the suction side phantom cooling. The most uniform coolant coverage is obtained for the case α = 20°.


  • 주제어

    Endwall cooling .   Swirling coolant jet .   Phantom cooling .   Aerodynamic loss .   Numerical simulation.  

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