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研究涡轮级封严内流动和主流的相互作用、相互影响,进一步认识盘腔内燃气入侵等非定常现象,急需流场实验数据验证。针对轮缘封严内空间狭窄、光路安排困难等问题,本文发展了一种用于测量涡轮级轮缘封严内非定常流场的准三维LDV技术,即测量分两步,首先在机匣上安置二维测速系统用符合方式测出径向、切向速度及湍流度,再在轮毂内安置一维探头重复测量,从两次测量数据中计算出轴向速度;该技术借助锁相采样等技术能测出不同动静叶相对位置情况下封严及盘腔内的周期性非定常流场细节,本文给出了部分典型的动态流场测量结果。
To study the interaction and interaction between the flow and the mainstream in the turbine seal, and to further understand the unsteady phenomena such as the gas intrusion in the disk chamber, the experimental data verification of the flow field is urgently needed. Aiming at the problems such as the narrow space in the rim seal and the difficulty in arranging the optical path, a quasi-three-dimensional LDV technique for measuring the unsteady flow field in the turbine-level rim seal has been developed. In this method, On the placement of two-dimensional speed measurement system in line with the measured radial, tangential velocity and turbulence, and then placed in the hub one-dimensional probe repeated measurements from two measurements to calculate the axial velocity; the technology with phase-locked sampling And other techniques can measure the relative position of the static and dynamic leaf seal and the disc cavity periodic unsteady flow field details, this paper gives some typical dynamic flow field measurement results.