Φ89涡轮钻具叶栅设计及性能预测

Cascade Design and Performance Prediction of the Φ89 Turbodrill

国内尚未有成熟可用外径89mm的涡轮钻具,因此急需研制该口径的涡轮钻具。涡轮钻具设计最关键的一环是叶栅设计,为此介绍了Φ89涡轮钻具叶栅的高度、叶片数、安装角以及进出口结构角等设计参数,并采用计算流体力学软件对不同转速下单级涡轮的性能进行了数值模拟,对定、转子流道内流场压力和流速分布进行了分析,并根据模拟结果预测了具有该种叶栅的涡轮节的输出性能。预测结果表明,以清水为流体介质,流量为6 L/s时,该规格的涡轮节最优转速为1750r/min,涡轮节制动扭矩约267Nm,最大功率可达32kW,满足要求,设计合理。

The mature and applicahle φ89 turhndrill has not emerged yet in China, so it is necessary to develop the φ89 lurhodrill. The cascade design is a critical part of this turhodrill. The turbine cascade height, leaf number, installation angle, inlet and outlet corners and other design parameters are presented in this paper. A computational fluid dynamic software is nsed to simulate of a single stage turbodrill performance with different rotation speeds. The pressure and velocity distributions in fluid passage are analyzed. And the output performance of the turbine section with the turbine cascade is predicted. Tht. resuhs indicate that when using 6L/s water as drilling tlnid, the turbodrill has the maximum optiannn rotation speed 1750r/min, braking torque 267Nm, and maximum power up to 32kW, which meet Ihe reqnirelnenls and mean a reasonable design.