摘要
为研究混流泵启动过程的瞬态特性,以试验测试转速与流量作为求解边界条件,建立了混流泵瞬态流动求解模型与方法.通过准稳态、瞬态数值方法求解的计算扬程与试验扬程的对比,验证了数值方法的可靠性,进而分析了混流泵启动过程中瞬态流场的演化以及启动加速度对内部流场的影响规律.研究结果表明:所采用的数值计算方法可较准确地反映启动过程的瞬态特性,瞬态扬程呈现明显瞬态效应;准稳态方法存在较大误差,基于相似定律的准稳态方法在瞬态性能研究中并不适用;受角加速度效应与流体惯性的影响,加速过程中叶片工作面的进口压力梯度比较明显,轮缘间隙处和叶片出口边尾缘处产生明显旋涡,并由此带来不同于准稳态工况的瞬态外特性;启动加速度对冲击扬程的影响较大,加速度大小决定着冲击扬程的峰值,流量滞后性也呈现明显区别.
To study the transient characteristics of the start-up process of a mixed-flow pump,a model and method for solving the transient flow of a mixed-flow pump was developed by using the experimental test speed and flow rate as the solution boundary conditions.The comparison between the head obtained by quasi-steady state and transient numerical methods and the experimental head was used to verify the accuracy of the numerical methods.The evolution of the transient flow field during the start-up process of the mixed flow pump and the effect of the start-up acceleration on the internal flow field were analyzed.It is found that the used numerical calculation method is more accurate in reflecting the transient characteristics of the start-up process and the transient head presents significant transient effects.The quasi-steady state method has large errors,and the quasi-steady state method based on similarity law is not applicable in transient performance studies.Due to the effect of angular acceleration and fluid inertia,the inlet pressure gradient at the blade working surface is more pronounced during acceleration,and significant vortices are generated at the blade tip and the trailing edge of the blade outlet side.It leads to transient hydraulic characteristics different from that under quasi-steady state conditions.The start-up acceleration has a greater impact on the impact head,the acceleration magnitude determines the peak of the impact head,and the flow lag is also significantly different.
作者
赵文斌
李伟
王行元
马凌凌
季磊磊
ZHAO Wenbin;LI Wei;WANG Xingyuan;MA Lingling;JI Leilei(School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China;National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China;Kunming Branch of 705 Research Institute of China Shipping Heavy Industry Group Co. Ltd., Kunming, Yunnan 650101, China)
出处
《排灌机械工程学报》
CSCD
北大核心
2022年第1期1-7,共7页
Journal of Drainage and Irrigation Machinery Engineering
基金
江苏省“一带一路”创新合作项目(BZ2020068)
江苏省农业科技自主创新资金资助项目(CX(20)2037)
江苏省第五期“333高层次人才培养工程”科研资助项目
江苏高校“青蓝工程”资助项目
江苏高校优势学科建设工程项目。
关键词
混流泵
启动过程
瞬态特性
内部流动
启动加速度
mixed-flow pump
start-up process
transient characteristics
internal flow
start-up acceleration
