为了研究气流在涡轮枞树型叶根间隙内的流动特性，以及校核与优化现有叶根间隙流量计算关联式。以某型地面燃气轮机涡轮一级转子枞树型叶根间隙为对象，对其进行了流量试验与三维数值模拟研究。测量了进出口压比范围为1~2工况下通过叶根间隙的流量值，该流量值对应的流动雷诺数范围为1 700~16 500。并在ANSYS/CFX中对相同模型及进出口边界条件下叶根间隙内的流动进行数值模拟，获得叶根间隙截面流动结构，同时计算了长径比39~118范围内，不同压比工况下通过叶根间隙的流量。研究表明：随着压比增大，流过叶根间隙的流量增大趋势逐渐减小；随着长径比增大，流过叶根间隙流量逐渐减小；文献\[10-11\]提供的叶根间隙流量计算关联式的计算结果与试验测量值平均误差16.3%；与关联式流量计算值随压比变化趋势不同，试验测量值分布曲线随压比增大无明显转折；两端宽、中间窄的叶根间隙通道结构使得流道内层流与湍流共存，从而造成了上述偏差；针对上述偏差，根据试验与三维数值模拟结果拟合了新的叶根间隙流量计算关联式。

In order to study the flow characteristics of the air flow in the turbine firtree blade root clearance, and to check and optimize the existing calculation correlation of the blade root clearance flow, taking the firststage rotor firtree blade root clearance of a ground gas turbine unit as an example, the flow test and threedimensional numerical simulation for it were carried out. The flow through the blade root clearance was measured under the pressure ratio of 1 to 2 at the inlet and outlet, and the corresponding Reynolds number was ranged from 1 700 to 16 500. The flow in the blade root clearance was numerically simulated in ANSYS/CFX for the same model under the same inlet and outlet boundary condition. The flow structure on the blade root clearance section was obtained, meanwhile the flow under different pressure ratios was calculated with the lengthtodiameter ratio ranged from 39 to 118. The research results show that with the increase of pressure ratio, the increasing trend of flow through the blade root clearance decreases gradually; with the increase of the lengthtodiameter ratio, the flow through the blade root clearance decreases; the average error between the calculated value using the flow calculation correlation in the blade root clearance provided in literature 10 to 11 and the test measured value is 16.3%; different from the variation trend of flow calculated value vs. pressure ratio, the distribution curve of test measured value has no obvious turning point with the increase of pressure ratio; the channel structure of blade root clearance with two wide ends and a narrow middle makes the layer flow and turbulence coexist, which causes the above deviation. In view of the above deviation, a new calculation correlation of flow in blade root clearance is fitted according to the experimental and 3D numerical simulation results.

TK221

浙江省“领雁”研发攻关计划项目(2022C011118)