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本文通过构建由一级动静叶组成的外流影响下的轮缘密封问题的实验和数值模型,针对燃气轮机透平转静轮盘间隙的封严与入侵问题开展了研究。其中第一部分主要关注燃气入侵的主要影响因素,入侵气体在腔室内部的分布规律和最小封严流量。结果表明:静叶尾缘的压力分布是造成燃气入侵的主要原因,即在主流的压力大于密封腔室内压力的区域会出现燃气侵入腔室,造成局部温度过高;主流压力小于腔室内部的压力区域,密封气体能够较好的封严转静间隙。入侵气体和封严气体的掺混主要发生在腔内高半径处并在高速旋转的动盘引发的夹带作用下深入腔室内部低半径处。因此在轮缘密封的结构设计中需要全面的考虑这些因素的影响。
In this paper, a series of experimental and numerical models of the wheel rim seal problem under the influence of outflow from the first stage of moving and stationary leaves are constructed to study the sealing and invading of the turbine rotating wheel and disk gap of the gas turbine. The first part focuses on the main influencing factors of gas invasion, the distribution of invaded gas inside the chamber and the minimum seal flow. The results show that the pressure distribution at the trailing edge of the stator vane is the main reason for the gas invasion. That is, gas will enter the chamber in the area where the pressure in the mainstream is greater than the pressure in the sealed chamber, causing the local temperature to be too high. Pressure area, sealing gas can better seal the static clearance. Intrusion of gas and seal gas mixture occurs mainly in the cavity at a high radius and the high-speed rotation of the disk-driven entrainment into the chamber at a low radius. Therefore, the structural design of the wheel rim seal needs full consideration of the impact of these factors.