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国家自然科学基金(51009072)

作品数:35 被引量:381H指数:12
相关作者:袁寿其张金凤黄茜袁建平周建佳更多>>
相关机构:江苏大学西华大学更多>>
发文基金:国家自然科学基金江苏省自然科学基金国家科技支撑计划更多>>
相关领域:机械工程农业科学水利工程金属学及工艺更多>>

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35 条 记 录,以下是 1-10
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Dynamic Stress Analysis of Sewage Centrifugal Pump Impeller Based on Two-way Coupling Method被引量:8
2014年
Current research on the operational reliability of centrifugal pumps has mainly focused on hydrodynamic instability. However, the interaction between the fluid and structure has not been sufficiently considered; this interaction can cause vibration and dynamic stress, which can affect the reliability. In this study, the dynamic stresses in a single-blade centrifugal pump impeller are analysed under different operating conditions; the two-way coupling method is used to calculate the fluid-structure interaction. Three-dimensional unsteady Reynolds-averaged Navier-Stokes equations are solved with the SST k-o9 turbulence model for the fluid in the whole flow passage, while transient structure dynamic analysis is used with the finite element method for the structure side. The dynamic stresses in the rotor system are computed according to the fourth strength theory. The stress results show that the highest stress is near the loose bearing and that the equivalent stress increases with the flow rate because the dynamic stresses are closely related to the pressure load. The stress distributions on the blade pressure side, suction side, leading edge, and trailing edge are each analysed for different flow rates; the highest stress distribution is found on the pressure side. On the blade pressure side, a relatively large stress is found near the trailing edge and hub side. Based on these results, a stress distribution prediction method is proposed for centrifugal pumps, which considers the interaction between the fluid and structuxe. The method can be used to check the dynamic stress at different flow rates when optimising the pump design to increase the pump reliability.
PEI JiYUAN ShouqiYUAN Jianping
Static stress and modal analysis on the impeller of screw centrifugal pump
The modeling of the screw centrifugal pump was set up with Pro/E,the meshing of the fluid domain and the impel...
S Q Yuan
基于PIV的低比转数离心泵网格无关性被引量:17
2016年
针对小流量工况采用计算流体动力学(CFD)对离心泵的性能进行数值模拟的精度问题,以一低比转数离心泵为例对其进行整体结构化网格划分,采用ANSYS CFX 14.5软件对模型离心泵的进口管路流道、叶轮流道以及蜗壳流道组成的流场进行定常数值计算.从改变整体网络数量与叶轮网格数量的角度分别进行网格无关性验证对0.6及1.0倍设计流量下的模拟精度进行比较研究.准确性评价指标采用外部特性扬程值及PIV得到的叶轮和蜗壳内部分区域的绝对速度,具有较强的说服性.分析表明:对总体网格数增加的方法进行的无关性分析即可满足要求;网格数量的增加对叶轮内绝对速度影响较大,而对蜗壳内绝对速度影响很小;在设计工况下,蜗壳和叶轮内部绝对速度的预测精度都比0.6Q_d工况下的高,因而在进一步小流量流动特性分析时,需要更精密的网格.通过对外特性和内流场速度的对比,最终选择网格模型为网格IGD.
张金凤黄茜袁寿其冒杰云王业芳
关键词:离心泵小流量PIV数值模拟
Numerical and Experimental Study on Flow-induced Noise at Blade-passing Frequency in Centrifugal Pumps被引量:16
2014年
With the increasing noise pollution, low noise optimization of centrifugal pimps has become a hot topic. However, experimental study on this problem is unacceptable for industrial applications due to unsustainable cost. A hybrid method that couples computational fluid dynamics (CFD) with computational aeroacoustic software is used to predict the flow-induced noise of pumps in order to minimize the noise of centrifugal pumps in actual projects. Under Langthjem's assumption that the blade surface pressure is the main flow-induced acoustic source in centrifugal pumps, the blade surface pressure pulsation is considered in terms of the acoustical sources and simulated using CFX software. The pressure pulsation and noise distribution in the near-cutoff region are examined for the blade-passing frequency (BPF) noise, and the sound pressure level (SPL) reached peaks near the cutoff that corresponded with the pressure pulsation in this region. An experiment is performed to validate this prediction. Four hydrophones are fixed to the inlet and outlet ports of the test pump to measure the flow-induced noise from the four-port model. The simulation results for the noise are analyzed and compared with the experimental results. The variation in the calculated noise with changes in the flow agreed well with the experimental results. When the flow rate was increased, the SPL first decreased and reached the minimum near the best efficient point (BEP); it then increased when the flow rate was further increased. The numerical and experimental results confirmed that the BPF noise generated by a blade-rotating dipole roughly reflects the acoustic features of centrifugal pumps. The noise simulation method in current study has a good feasibility and suitability, which could be adopted in engineering design to predict and optimize the hydroacoustic behavior of centrifugal pumps.
YANG JunYUAN ShouqiYUAN JianpingSI QiaoruiPEI Ji
Numerical prediction of 3-D periodic flow unsteadiness in a centrifugal pump under part-load condition被引量:9
2014年
Numerical simulation and 3-D periodic flow unsteadiness analysis for a centrifugal pump with volute are carried out in whole flow passage, including the impeller with twisted blades, the volute and the side chamber channels under a part-load condition. The pressure fluctuation intensity coefficient (PFIC) based on the standard deviation method, the time-averaged velocity unsteadiness intensity coefficient (VUIC) and the time-averaged turbulence intensity coefficient (TIC) are defined by averaging the results at each grid node for an entire impeller revolution period. Therefore, the strength distributions of the periodic flow unsteadiness based on the unsteady Reynolds-averaged Navier-Stokes (URANS) equations can be analyzed directly and in detail. It is shown that under the 0.6Qd~. condition, the pressure fluctuation intensity is larger near the blade pressure side than near the suction side, and a high fluctuation intensity can be observed at the beginning section of the spiral of the volute. The flow velocity unsteadiness intensity is larger near the blade suction side than near the pressure side. A strong turbulence intensity can be found near the blade suction side, the impeller shroud side as well as in the side chamber. The leakage flow has a significant effect on the inflow of the impeller, and can increase both the flow velocity unsteadiness intensity and the turbulence intensity near the wall. The accumulative flow unstea- diness results of an impeller revolution can be an important aspect to be considered in the centrifugal pump optimum design for obtaining a more stable inner flow of the pump and reducing the flow-induced vibration and noise in certain components.
裴吉袁寿其李晓俊袁建平
ZJ-200-25型螺旋离心泵转子静力学分析被引量:4
2012年
为研究螺旋离心泵叶轮与转轴工作时的振动特性,以ZJ-200-25型双叶片螺旋离心泵为研究对象,建立了螺旋离心泵内部流场三维模型,并对其设计工况进行了数值模拟.建立转子部分的有限元模型,根据泵腔内流场压力分布,对转子进行了有预应力的静力学分析和模态分析,获得了转子的对载荷的响应信息、固有频率和对应的振型.结果表明:转子强度满足设计要求,应力最大的点位于叶片根部及轴肩处;转子为刚性,但其在工作时的叶片通过频率与前两阶固有频率比较接近,这说明转子的转速不尽合理,工作时产生共振的可能性较高.因此需要对螺旋离心泵转子结构进行优化设计,可通过更改轴承位置、重新设计轴向和径向尺寸以及更换轴的材料来实现.从而改变转子的固有频率,使固有频率能够避开泵内流动的激励频率,避免发生共振.
徐宇平袁寿其张金凤周建佳李彤
关键词:螺旋离心泵转子静力学分析流固耦合模态
分流叶片离心泵非定常流动及动力学特性分析被引量:15
2014年
为了研究在流固耦合作用下分流叶片对低比转数离心泵内部非定流动及结构动力特性的影响,以高温熔盐泵为研究对象,采用计算流体力学软件ANSYS CFX12.1和有限元软件ANSYS Workbench对有/无分流叶片的两种方案高温熔盐泵,进行了考虑泵内部流场和结构场的相互作用的双向流固耦合求解。对比分析了两种方案对泵非定常流动及结构动力特性的影响,结果表明:流固耦合作用使得各监测点的压力脉动和径向力脉动规律和幅值均发生了明显变化,说明在该类泵的流场模拟中,流固耦合作用较明显,不可忽视;分流叶片的添置减小了流场内压力脉动及径向力脉动幅值;带分流叶片转子的变形量变化梯度、等效应力变化梯度、最大变形量及最大应力值均小于不带分流叶片转子,且带分流叶片转子等效应力随时间的变化也明显小于不带分流叶片转子。即分流叶片的添置不仅有利于提高转子的承载能力,而且还有利于改善转子的变形和受力,从而提高转子的抗疲劳能力。
张金凤王文杰方玉建叶丽婷袁寿其
关键词:非定常流动结构动力特性
离心泵进口回流流场及其控制方法的数值模拟被引量:37
2012年
在小流量工况下运行时离心泵叶轮进口会产生进口回流现象.采用标准k-ε湍流模型,应用ANSYS CFX软件对不同工况下低比转速离心泵进口处的三维湍流场进行了数值模拟,分析了流场内的速度分布.为减小进口回流的危害,提出了在离心泵进口加注高压水的回流控制方案.对注入不同压力的高压水后,数值分析了进口流场的速度分布和回流漩涡的形态变化,并对比分析了回流控制效果以及离心泵扬程和效率.结果表明:在进口处注入高压水能有效改善回流发生时的流场速度分布,减弱回流强度,降低回流发生的关键流量点;但高压水的注入在设计流量和大流量范围内还会降低泵的扬程和效率;综合考虑各种因素后选择在该叶轮进口处注入0.10 MPa的高压水作为本模型泵的回流控制方案.
张金凤梁赟袁建平袁寿其
关键词:离心泵数值模拟叶轮
流固耦合作用对螺旋离心泵流场影响的数值分析被引量:27
2013年
为研究流固耦合作用对螺旋离心泵内部流场的影响,以ZJ200-25型螺旋离心泵为研究对象,应用计算流体力学软件CFX12.1和有限元软件ANSYS Workbench对螺旋离心泵进行了考虑内部流场和结构相互作用的两场交替联合求解,并以相同的设置对不考虑流固耦合作用的内部流场进行了计算。对比分析两种计算方法得到的流场发现,考虑流固耦合作用后:泵进口处的压力波动加剧,出口压力波动强度降低,进出口波动频率不变,但相位有改变;速度分布满足共同的规律,但在小流量工况下差别最大,同时在叶片与隔舌处于相干位置时,隔舌附近流动也受到明显影响;径向力大小随时间变化规律一致,但波动范围减小;考虑流固耦合作用后叶轮流道内流动更加不对称。
袁寿其徐宇平张金凤裴吉周建佳
关键词:螺旋离心泵双叶片
低比转数离心泵驼峰工况附近内部流动特性分析被引量:10
2015年
为了揭示驼峰的产生机理,采用CFD数值预报对低比转数离心泵驼峰工况附近内部流动特性进行了深入分析,建立了扬程与内部流动特性之间的关系.在0.1~1.6倍设计流量下扬程的模拟值与试验值的相对误差在3.62%以内,且预报驼峰所在工况与实测结果基本一致.对驼峰附近工况0.2,0.3,0.4倍设计流量下的内部流动进行了分析,预报结果表明:泵进口管道存在大量回流,造成叶轮进口预旋,诱发驼峰;各叶轮流道内均存在不同程度大小的旋涡,在0.2和0.3倍工况甚至堵塞了整个流道;存在旋涡的叶轮流道出口相对速度值较大,而绝对速度值较小.结合泵基本方程进一步分析,发现出口相对流速的增大使得扬程降低,引发驼峰.对比叶轮出口R/R2=0.9处绝对速度,小流量下波动更加严重,且其圆周分量下降非常明显,直接降低了这些工况下的扬程值;叶轮进口的预旋及出口回流是诱发驼峰的原因,消除或者减小这些非稳态现象可作为抑制驼峰的出发点.
冒杰云袁寿其张金凤李亚林王业芳
关键词:离心泵低比转数驼峰小流量
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