College of Mechanical and Electronic Engineering,Shandong University of Science and Technology

为了提高对旋风机的稳定裕度,采用数值模拟方法,将周向单槽机匣处理技术应用于FBCDZ-No20型对旋风机的扩稳,探究了周向槽的轴向位置对风机气动性能和扩稳能力的影响。研究表明:对前级叶轮进行周向单槽机匣处理,可以提高对旋风机的稳定裕度,且周向单槽的轴向位置对风机的气动性能和扩稳能力均具有影响;当周向单槽位于前级叶片的前缘和25%叶顶轴向弦长时,风机可以获得可观的稳定裕度提高量,但峰值效率损失较大;当周向单槽分别位于50%、75%的叶顶轴向弦长和尾缘时,扩稳效果逐渐减弱,相应的效率损失也逐渐减小。周向槽是通过抽吸叶片压力面前缘的低能流体,并将其沿周向输运至叶片吸力面的前缘喷出,从而增大了前级叶轮进口相对气流角及叶顶泄漏流的轴向动量,改变了叶顶泄漏流的轨迹,抑制了前缘溢流与尾缘处的边界层分离,进而减轻叶片通道内的流动堵塞,推迟了失速的发生而实现扩稳。采用前级周向单槽机匣处理并未改变对旋风机的最先失速级和失速起始类型。

In order to improve the stability margin of the fan,the stability improvement mechanism of the fan by applying the single circumferential groove treatment to a FBCDZ-No20 contra-rotating fan is numerically investigated,and the influence of the axial position of the circumferential groove on the aerodynamic performance and stability improvement ability of the fan was explored. The results show that the single circumferential groove casing treatment of the front impeller can improve the stability margin of the fan,and the axial position of the single circumferential groove has an impact on the aerodynamic performance and stability improvement of the fan. When the single circumferential groove is located at the leading edge of the front blade and 25% of the axial chord length of the blade tip, considerable stability margin improvement can be achieved with a higher peak efficiency loss. When the single circumferential groove is located at 50%,75% of the axial chord length of the blade tip and the trailing edge,respectively,the stability improvement effect gradually weakens,and the corresponding efficiency loss also gradually decreases. The circumferential groove increases the axial momentum of the leakage flow at the blade tip and increasing the relative airflow angle at the inlet of front impeller through the extraction of the low-energy fluid from the front edge of the blade pressure side,transporting it along the circumferential direction to and ejecting at the leading edge of the blade suction side, changing the trajectory of the leakage flow at the blade tip, suppressing leading edge overflow and boundary layer separation at the trailing edge, thus reducing blockage in the blade channel and delaying Mining Safety & Environmental stall inception,achieving stability improvement. Neither the stage where the stall first occurred in the contra-rotating fan nor the stall inception type is changed after the application of the single circumferential groove casing treatment.

山东省自然科学基金项目(ZR2021ME242)

陈庆光,石晓杰,李凯伦,等.矿用对旋主通风机周向槽机匣处理扩稳机理研究[J].矿业安全与环保,2024,51(5):105-111.

CHEN Qingguang,SHI Xiaojie,LI Kailun,et al. Study on stability improvement mechanism for a coal mine contra-rotating main fan with circumferential groove casing treatment[J]. Mining Safety & Environmental Protection,2024,51(5):105-111.