矿用对旋式主通风机缝-槽耦合机匣处理扩稳性能研究  

Stability expansion performance of slots-groove coupled casing treatment for coal mine contra-rotating main fan

作　　者：陈庆光[1] 刘海秀 王钦昌 林先来 CHEN Qingguang;LIU Haixiu;WANG Qinchang;LIN Xianlai(College of Mechanical and Electronic Engineering,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]山东科技大学机械电子工程学院,山东青岛266590

出　　处：《煤炭工程》2025年第3期165-171,共7页Coal Engineering

基　　金：山东省自然科学基金项目(ZR2021ME242)。

摘　　要：以扩稳性能良好的逆角向缝机匣处理为基础,通过在缝的不同轴向位置增设周向槽,得到三种逆角向缝-周向槽耦合机匣处理,并将其应用于FBCDZ-No20型矿用对旋式主通风机。通过数值模拟,对比分析了逆角向缝和三种缝-槽耦合机匣处理对风机扩稳性能的影响。结果表明:逆角向缝机匣处理可有效提高对旋风机的稳定裕度,采用三种逆角向缝-周向槽耦合机匣处理,都可进一步提高风机的稳定裕度,但也会引起峰值效率不同程度的降低。其中,当周向槽位于逆角向缝的前端时,扩稳效果最好,但效率损失也最大。随着周向槽向缝的尾端移动,扩稳能力逐渐减弱。实施缝-槽耦合机匣处理后,前级叶片吸力面与压力面之间压差的显著变化使得叶顶泄漏流的驱动力增大,而且由于对前级叶顶通道内气流的抽吸和喷射作用,吹除了叶顶通道内的低速气流,减轻了流动堵塞,增大了叶顶泄漏流的轴向速度,改善了叶顶区域流场,延缓了失速的发生,因而提高了风机的稳定裕度。然而,气流在缝-槽耦合机匣处理内部产生的流动损失,以及由机匣处理产生的射流与叶顶通道内气流之间的掺混所引起的流动损失,都导致风机峰值效率降低。Based on a reversed blade angle slots casing treatment with good stability expansion performance,three schemes of reversed blade angle slots-circumferential groove coupling casing treatment were obtained by adding a circumferential groove at different axial positions of the reversed blade angle slots,which were applied to the FBCDZ-No20 coal mine contra-rotating main fan.The influence of the reversed blade angle slots casing treatment and the three schemes of slots-groove coupling casing treatment on the stability expansion performance of the fan were compared and analyzed numerically.The results show that the reversed blade angle slots casing treatment effectively improves the stability margin of the contra-rotating fan.The implementation of the three schemes of slots-groove coupling casing treatment further improves the stability margin of the fan,but they also result in varying degrees of reduction in peak efficiency.Among them,when the circumferential groove is located at the front end of the reversed blade angle slots,the stability expansion effect is the best,but the efficiency loss is also the largest.As the circumferential groove moves towards the trailing end of the slots,the stability expansion capacity gradually weakens.After a slots-groove coupling casing treatment is implemented,the driving force of the blade tip leakage flow increases due to the considerable change of the pressure difference between the suction surface and pressure surface of the front stage blade.In addition,with the suction and injection effects of the airflow in the blade tip channel of the front stage,the low-speed air flow in the blade tip channel is blown away,reducing flow blockage,increasing the axial velocity of the blade tip leakage flow,improving the flow situation in the blade tip region,delaying the occurrence of stall,and thereby improving the stability margin of the fan.However,the flow losses generated by the airflow inside the slots-groove coupled casing treatment,as well as the flow losses caused by the mixing betw

关 键 词：对旋风机 逆角向缝 缝-槽耦合机匣处理 稳定裕度 扩稳机理 

分 类 号：TD441[矿业工程—矿山机电]