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采用基于附加示踪变量法和数值求解三维Unsteady Reynolds-Averaged Navier-Stokes(URANs)和k-ω-SST紊流模型研究了涡轮轮缘密封的非定常燃气入侵和封严效率。通过与模型实验的轮缘密封封严效率的比较,表明非定常时均结果与实验数据吻合良好,同时验证了基于附加示踪变量法的非定常数值方法模拟轮缘密封封严特性的有效性。分析了轴向和双重轴向轮缘密封的非定常封严特性。研究结果表明:静叶尾迹和动叶前缘附近的压力势场的非定常干涉效应以及盘腔中非定常的压力分布会强化主流燃气入侵。与非定常计算时均结果相比,定常计算会低估轮缘密封的燃气入侵量以及燃气入侵对盘腔流场的影响。双重轴向轮缘密封相比于简单轴向轮缘密封可以显著提高涡轮盘腔的封严效率。
The Unsteady Reynolds-Averaged Navier-Stokes (URANs) and k-ω-SST turbulence models are used to study the unsteady gas invasion and sealing efficiency of the turbine rim seal based on the additional tracer variable method and numerical solution. The comparison between the experimental results and the experimental results shows that the unsteady time-averaged results are in good agreement with the experimental data, and the validity of the non-stationary numerical method based on the additional tracer variables . The unsteady seal characteristics of both axial and double axial flange seals were analyzed. The results show that the unsteady interference effect of the vortex trail and the pressure potential field near the leading edge of the bucket and the unsteady pressure distribution in the disk chamber will intensify the mainstream gas invasion. Compared with the unsteady time-averaged results, the steady-state calculation will underestimate the impact of the gas seal on the rim seal and the gas flow on the disk cavity. Dual axial flange seals can significantly improve turbo disk seal efficiency compared to simple axial flange seals.