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| 1 | Energy Loss Analysis of Novel Self-Priming Pump Based on the Entropy Production Theory显示文摘The conventional method cannot explicitly confirm the location and type of the energy loss, therefore this paper employs the entropy production theory to systematically analyze the category, magnitude and location of hydraulic loss under different blade thickness distribution. Based on the analysis, the turbulent entropy and viscosity entropy produced by the separation of boundary layer at the trialing edge are major factors leading to the hydraulic loss. In addition, the separation of the boundary layer can not only cause the energy loss, but also block the passage of the impeller and reduce the expelling coefficient of the blade. Therefore, the hydraulic performance of the blades with increment thickness distribution is obviously better than the decrement one. Further, the flow rate has different influence on the three types of entropy production. Meanwhile, the pressure pulsation on the working surface was investigated. It was concluded that with flow rates increasing, the amplitude of pressure pulsation firstly decreases and then smoothly improves, and reaches the minimum under design flow rate. Finally, the optimal blade was obtained, and the relevant hydraulic performance test was performed to benchmark the simulation result. This research can provide the theoretical reference for designing the reasonable thickness distribution of the blades. | CHANG Hao SHI Weidong LI Wei LIU Jianrui | 2019 | Journal of Thermal Science2019，28，2： | 6 |
| 2 | 双蜗壳离心泵泵腔轴向宽度与流动特性的关系显示文摘离心泵泵腔轴向宽度对泵腔液体流动特性具有较大影响,选取单级单吸半开式叶轮双蜗壳离心泵为研究对象,在6种不同泵腔轴向宽度条件下,对比分析泵腔压力场、速度场分布规律,得出泵腔压力在不同角度(0°,90°,180°,270°)沿径向变化特征,揭示泵腔压力与叶轮半径关联性,绘制切向速度、径向速度在不同角度沿轴向分布曲线。结果表明:当泵腔轴向宽度由23.9增大至43.9 mm时,同一径向位置的压力值逐渐增大,径向压差不断减小;同一泵腔轴向宽度下,压力均值沿径向近似呈抛物线且不断增加。不同角度方向的切向速度沿轴向分布差别较小,且湍流核心区无量纲切向速度均值随泵腔轴向宽度的增大逐渐由0.32减小到0.19;不同角度方向的径向速度沿轴向分布差别较大,0°和180°方向上存在涡流,但湍流核心区径向速度均值近似为0。该研究为离心泵水力设计、结构设计和准确计算轴向力提供了有力的依据。 | 董玮 何庆南 梁武科 魏清希 董言 孙健 | 2020 | 西北工业大学学报2020，38，6： | 5 |
| 3 | 后泵腔宽度对半开式叶轮离心泵性能与轴向力的影响显示文摘在XUY200-150-250单级单吸双蜗壳悬臂式半开叶轮离心泵性能数值模拟与实验测试结果基本吻合的基础上,选取后泵腔宽度S分别为0.23 Sd、0.49 Sd、0.74 Sd、Sd和1.26 Sd的五种条件,对流量0.79 Qd-1.32 Qd范围内的泵的性能及轴向力进行数值计算。研究后泵腔宽度对离心泵效率、扬程、轴功率和轴向力的影响,分析设计流量Qd工况下,五种不同宽度的泵腔压力分布情况。结果表明:设计流量Qd工况下,后泵腔宽度由0.23 Sd-1.26 Sd增加时,效率呈先增加后保持不变趋势,在后泵腔宽度为0.74 Sd时达到最大值,扬程和轴功率呈逐渐增加趋势变化;后泵腔宽度由0.23 Sd-1.26 Sd增加时,在流量0.79 Qd-1.05 Qd区间内,同一流量工况下,轴向力呈先减小后增大趋势,在后泵腔宽度为0.49 Sd时轴向力值最小;在流量1.16 Qd-1.32 Qd区间内,同一流量工况下,轴向力呈不断增大趋势;后泵腔宽度越大泵腔压力分布越均匀。该研究可以为单级单吸双蜗壳悬臂式半开叶轮离心泵优化性能及平衡轴向力提供依据。 | 梁武科 刘帆 董玮 吴子娟 魏清希 江伟 | 2020 | 水动力学研究与进展(A辑)2020，35，6： | 3 |
| 4 | Experimental Optimization of Jet Self-Priming Centrifugal Pump Based on Orthogonal Design and Grey-Correlational Method显示文摘The novel jet self-priming centrifugal pump,as important modern irrigation equipment,is widely used in large-scale irrigation,mine drainage and so on.In order to improve the profile streamline of blade,the inlet shape of impeller was designed as distorted and the outlet shape as cylindrical,which can not only improve the pump efficiency,but also shorten the self-priming time.Further,the novel jet self-priming system was proposed,by employing the jet nozzle and check valve to improve the velocity of self-priming.Meanwhile,nine different structure jet nozzles were designed based on the orthogonal design method,and the relevant self-priming experiments were performed on I level accuracy test bench in Jiangsu University.According to the greycorrelational analysis,the influence of the nozzle geometry parameters on the self-priming performance was obtained.The relationship between self-priming time and self-priming height was discussed.The test results showed that the hydraulic design of jet self-priming centrifugal pump was reasonable;all indicators met the Chinese national standard;the head reached 21.04 m and efficiency was 72.8%under the design flow condition.What is more,the self-priming performance was obviously improved by adjusting the geometrical parameters of nozzle.When the height of the self-priming process was 5.3 m,the self-priming time reached 62 s,which was much shorter than the national standard.Therefore,this research could provide reference for designing the structure of jet self-priming centrifugal pump. | CHANG Hao SHI Weidong LI Wei WANG Chuan ZHOU Ling LIU Jianrui YANG Yongfei RAMESH KAgarwal | 2020 | Journal of Thermal Science2020，29，1： | 3 |
| 5 | 低比转速离心泵压力脉动特性研究显示文摘为了降低压力脉动对低比转速离心泵产生的不利影响,在固液两相流条件下,对离心泵内的压力脉动(尤其是隔舌处的压力脉动)以及径向力进行了研究。首先,以一台n_(s)为66的低比转速离心泵为研究对象,利用软件构建了离心泵三维仿真模型,并对模型进行了网格划分;然后,选用了Mixture多相流模型和RNG k-ε湍流模型作为计算模型,在离心泵叶片、蜗壳以及隔舌处设置了监测点,并设置了计算方案;最后,采用ANSYS CFX软件,通过数值模拟的方法,对低比转速离心泵内部各监测点的压力脉动和径向力规律进行了研究,以得到离心泵内颗粒粒径、颗粒浓度和离心泵流量对离心泵压力脉动特性的影响规律。研究结果表明:当d=1.0%时,随着颗粒粒径增大,各监测点的压力脉动幅值减小,叶轮处径向力总体下降,蜗壳处径向力总体上升;当d=0.5 mm时,随着液体浓度增加,离心泵内压力脉动幅值整体呈上升趋势,但隔舌处略有减小,叶轮处所受径向力不断增加,蜗壳处径向力减小;离心泵隔舌处监测点的压力脉动主要出现在叶频及其倍频处,叶片监测点处的压力脉动主要出现在小频率区间内,因此,适当减小离心泵内颗粒粒径,增加颗粒浓度及流量可以降低隔舌处的压力脉动。 | 任蔼琳 宋文武 周月 | 2022 | 机电工程2022，39，12： | 2 |
| 6 | 电机转速变化对输油泵内部流场影响的仿真研究显示文摘旨在利用ANSYS Fluent研究电机转速对输油泵蜗壳内液体动力噪声特性的影响。以ZA150-4400输油泵为研究对象,采用RNGk-ε模型模拟不同转速下的流体静压分布和内部流场的流动瞬态特性。结果表明,电机转速是影响输油泵蜗壳内静压分布和流体瞬态特性的主要因素。不同粘度蜗壳内部流场呈现不同的分布状态,粘度越大,静压值越小,当原油粘度一定时,电机转速越低,蜗壳内的静压力波动越小。当电机转速下降到临界值时,蜗壳内壁上的静压力大致相等。 | 刘祥楼 曲晶 张雅茹 刘昭廷 | 2023 | 自动化与仪器仪表2023，，8： | 0 |
| 7 | 平衡孔特征参数对离心泵后泵腔压力及轴向力的影响显示文摘为研究平衡孔特征参数对离心泵轴向力的影响,将IS80-65-160单级单吸离心泵作为研究对象,在设计工况下运用ANSYS CFX软件对具有不同平衡孔直径、数量和位置等特征参数的27种离心泵模型的外特性、内流场进行数值计算,获取离心泵后泵腔压力、泄漏量及轴向力随平衡孔特征参数改变的变化规律;同时引入能综合体现平衡孔直径、个数、位置的面积比系数t来探究平衡轴向力效果。结果表明:在设计工况下,当平衡孔数量等于叶片数时平衡的轴向力最多,可平衡近53.82%;随着平衡孔直径的增加,轴向力呈先减小后趋于平缓的变化规律;后泵腔同一位置处的压力随平衡孔直径的增大而减小,但距离轴中心越远,压力的分布越趋向一致,且分布一致的起始位置约在平衡孔位置半径处;离心泵泵腔中被平衡的轴向力随面积比系数t的增大而近似呈抛物线变化规律,当t趋近于16.5%时,平衡轴向力效果最好,可平衡约50%的轴向力。 | 刘金武 袁一芳 孙峰 张政 王伟宁 董玮 | 2023 | 大电机技术2023，，6： | 0 |
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