Jiangsu Zhenhua Pump Manufacturing Co.

Taizhou, China

Jiangsu Zhenhua Pump Manufacturing Co.

Taizhou, China
SEARCH FILTERS
Time filter
Source Type

Wang Y.,Jiangsu University | Wang Y.,Jiangsu Zhenhua Pump Manufacturing Co. | Liu H.,Jiangsu University | Yuan S.,Jiangsu University | And 2 more authors.
Paiguan Jixie Gongcheng Xuebao/Journal of Drainage and Irrigation Machinery Engineering | Year: 2013

In order to identify effects of vane wrap angle on the cavitation induced vibration and noise of centrifugal pumps, a single-stage, end-suction centrifugal pump was chosen as the experimental model, in which the vane wrap angles were 110°, 115°, 120° and 125°, respectively, while the rest geometric parameter of the pump kept unchanged. The cavitation induced vibration and noise signals of the pump with different vane wrap angles were measured under various net positive suction heads availa-ble by using a closed-loop centrifugal pump test rig, and then the signals were processed and analyzed. The experimental results showed that the vane wrap angle affects the pump cavitation performance without a clear regularity, but there exists an optimal angle indeed. With increasing wrap angle, the vibration intensities picked up at the four monitoring points don't show a consistent pattern; however, the lowest intensity is founded at the discharge nozzle flange where all the intensity is below 1.0 m/s2. With increasing wrap angle, the peak values of noise signal at shaft rotating frequency decrease, but those at the blade passing frequency change in complicated manner under non-cavitating condition. During both cavitation inception and development stage, the peak values of noise signal at the shaft rotating frequency always increase initially and then drop off. Furthermore, the peak values of the energy at 1750-2250 Hz also show the same pattern with exacerbation of cavitation.


Wang X.-L.,Jiangsu University | Yuan S.-Q.,Jiangsu University | Zhu R.-S.,Jiangsu University | Fu Q.,Jiangsu University | Wang J.-G.,Jiangsu Zhenhua Pump Manufacturing Co.
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2014

In order to decrease pressure fluctuation of the reactor coolant pump under different conditions, three different inlet diameters of short blade of the reactor coolant pump were compared using numerical simulation, and the results show that the change of flow or inlet diameter of short blade does not change the dominant frequency of impeller. The high frequency of the suction side of blade gradually decreases and the high frequency of the pressure face gradually increases with the increase of inlet diameter of short blade. The pressure fluctuation amplitude of different inlet diameters of short blade with small flow is large. The wave energy of each monitoring point in the low frequency region and the high frequency region on the suction side of blade is significantly larger than that of the pressure face in the design condition. The band width of the low frequency region and wave energy of the high frequency region of monitoring points near the suction side of blade significantly increase at large flow fluctuation. The fluctuation amplitude of monitoring points near the pressure face of the blade has a large increase. The pulsation amplitude of each monitoring point near the suction side of the short blade is significantly higher than that of the long blade. The comprehensive analysis shows that when the inlet diameter of the short blade is 0.72D2, the pressure fluctuation in a variety of conditions reaches minimum.


Wang X.-L.,Jiangsu University | Yuan S.-Q.,Jiangsu University | Zhu R.-S.,Jiangsu University | Fu Q.,Jiangsu University | Yu Z.-J.,Jiangsu Zhenhua Pump Manufacturing Co.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2012

For studying transient hydraulic characteristics and internal flow mechanism in a centrifugal pump from design conditions to non-design transition, a three-dimensional modeling for a centrifugal pump internal flow was done with three-dimensional software pro/E. Based on Reynolds-averaged Navier-Stokes equations with RNGk-ε turbulence model and SIMPLEC algorithm, using a full-cavitation model and considering effects of cavitations when gas did not dissolve in water, using the computational fluid dynamics software CFX, the numerical simulation calculation for transient flow characteristics under variable operating conditions in whole flow passage of a centrifugal pump was conducted. The cavitation characteristics of a centrifugal pump under the condition of inlet pressure continuously declining were analyzed with numerical simulation, and the results were compared with the experimental ones. It was shown that the numerical simulation results and the experimental ones have the same trend. The flow field analysis showed that under the condition of variable flow transition, the pressure around the impeller does not significantly increase, but the amplitude of the pressure increases with increase in flow; in the transition to large-volume, the increase in flow has little effect on the blade transient load, but in the transition to the low flow, the presence of secondary return and other factors have a great effect on the blade transient load; in the transition process from design conditions to cavitation conditions, at a critical NPSH, affected by bubble phases, the blade transient load varies greatly, especially, in the inlet, it varies more; the pressure and its amplitude have sharp declines; the radial force acting on the impeller also has sharp increases.


Wang X.-L.,Jiangsu University | Yuan S.-Q.,Jiangsu University | Zhu R.-S.,Jiangsu University | Fu Q.,Jiangsu University | Wang J.-G.,Jiangsu Zhen Hua Pump Manufacturing Co.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2014

To study the effect of number of blades and guide vanes on a reactor coolant pump's radial force under variable flow transition conditions, the computational fluid dynamics software CFX was applied in the numerical simulation and test for the radial force variation law with number of blades or guide vanes changed. Compared the numerical simulation results with the experimental ones, both of them were within the error control range. The results showed that with flow rate increasing, the radial force of the reactor coolant pump impeller increases with increase in number of blades, and reaches the maximum value with the blade number of 7, the periodicity of the radial force tends to regularity, the radial force balance tends to the optimum working condition; with flow rate decreasing, the position of the impeller radial force offsets and rotates regularly in its rotating cycle, and the variation gradients of offset and rotation are different; the variation gradients of the impeller radial force offset and rotation are obviously greater than those corresponding to a larger flow increasing. Through the comprehensive comparison, it was shown that when the number of blades is five and the guide vanes is 11, the radial force on the impeller is the minimum. ©, 2014, Chinese Vibration Engineering Society. All right reserved.


Wang X.,Jiangsu University | Yuan S.,Jiangsu University | Zhu R.,Jiangsu University | Fu Q.,Jiangsu University | Yu Z.,Jiangsu Zhenhua Pump Manufacturing Co.
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2012

In order to study internal flow variation when centrifugal pump cavitations occur, three-dimensional modeling was used for centrifugal pumps internal flow through three-dimensional software Pro/E. Based on the Reynolds-averaged N-S equations with the RNG k-ε turbulence model and SIMPLEC algorithm, the full-cavitation model was used considering effects on cavitations when the gas was not dissolved in the water. By using the computational fluid dynamics software CFX, the numerical simulation calculation of vapor-liquid two-phase turbulence within whole flow passage of centrifugal pump was conducted and the laws of the unsteady flow when centrifugal pump cavitations occur were analyzed. The results show that within this range from the newborn to the critical cavitations NPSH, the gas volume fraction mainly begins from dimensionless radial position 0.2, and the gas volume fraction density correspondingly increases with the lower of NPSH. Affected by asymmetry distribution under the effect of the impeller and volute coupling, in the newborn of cavitations, impeller pressure fluctuations were sinusoidal periodic variation. With the lower of NPSH and gas volume fraction increasing, impeller pressure is changing irregularly. From the beginning of the tongue, along the impeller rotating direction, pressure fluctuation gradually declines.


Wang X.,Jiangsu University | Zhu R.,Jiangsu University | Su B.,Jiangsu University | Yu Z.,Jiangsu Zhenhua Pump Manufacturing Co.
Nongye Jixie Xuebao/Transactions of the Chinese Society of Agricultural Machinery | Year: 2012

The optimization design of vortex pump impeller parameter was done by using the orthogonal design method. Orthogonal scheme of five factors and two levels was designed, and the influence of geometrical parameters on the characteristics was studied. Reynolds averaged Navier-Stokes method was adopted to simulate every set of parameters obtained by the orthogonal design method. Optimal scheme of the characteristics was found by analyzing the contrast of performance curves. The influence orders of geometrical parameters to the characteristics were obtained with range analysis. The optimization parameter combination was obtained with comprehensive balance analysis and comparison to the data result. Meanwhile, the optimized design scheme was determined, and corresponding test was carried out. It demonstrated that the experimental purpose was reached, the design method was reasonable, and it had the property of both high efficiency and non-overload.


Wang X.,Jiangsu University | Yuan S.,Jiangsu University | Zhu R.,Jiangsu University | Yu Z.,Jiangsu Zhenhua Pump Manufacturing Co. | Zhuang W.,Jiangsu Zhenhua Pump Manufacturing Co.
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2012

To improve the cavitations performance of centrifugal pumps, using the combination of CFD numerical simulation and experimental study on the long blade and short blade centrifugal pump and vapor-liquid two-phase rules inside the impeller were analyzed in different NPSH, and the effect of three different short blades in different cavitations conditions on the impeller internal flow and performance was analysed. It is concluded: the selection of reasonable import diameter can improve the performance of anti-cavitation, while the NPSH fell to some degree, and centrifugal pump import diameter is 0.65D 2, whirlpool cavitation zone appears on the back of long blade and short blade; while centrifugal pump import diameter is 0.75D 2, there are two whirlpool cavitation zones on the back of long blade and short blade;it has worked best with anti-cavitation performance that the centrifugal pump import diameter is 0.85D 2.


Wang X.-L.,Jiangsu University | Yuan S.-Q.,Jiangsu University | Zhu R.-S.,Jiangsu University | Fu Q.,Jiangsu University | Tang X.-C.,Jiangsu Zhenhua Pump Manufacturing Co.
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2013

For the study of the transient hydrodynamics of nuclear reactor coolant pump during stopping period, Pro/E software for 3-D modeling, CFX software based on Reynolds N-S equation and RNG k-ε equation were used to simulate the transient characteristics of nuclear reactor coolant pump impeller flow path during stopping period. The vortex in the impeller outlet is less than that in the impeller inlet. The vortex of the impeller outlet influenced by the static interference between the impeller and guide vane shows the periodic substantial fluctuations. The vortex in the junction between the pump body and outlet pipe is large, and the vortex in the opposite direction of the guide vane is the largest. The radial force of linear turning down model shows a periodic fluctuation and gradual decrease. Turning down model with the idler wheel has the same tendency as the linear turning down model though the change amplitude is less than that of radial force for linear turning down model. Especially while the parameter t/T is 0.6-1, the radial force is close to 0. The radial force of regular turning down model shows an irregular change. When the parameter t/T is 0.25, its radial force is the largest, which has great influence on the reliability of nuclear reactor coolant pump.


Wang X.-L.,Jiangsu University | Yuan S.-Q.,Jiangsu University | Zhu R.-S.,Jiangsu University | Fu Q.,Jiangsu University | Yu Z.-J.,Jiangsu Zhenhua Pump Manufacturing Co.
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2013

For the study on the transient hydraulic characteristics and internal flow mechanism of the nuclear reactor coolant pump in the transient process from design operation conditions to off-design conditions, the variable flow transient characteristics of centrifugal pump impeller passageway were simulated by using CFX software. The results show that during the variable flow transition, the distribution of pressure pulsation of the nuclear reactor coolant pump along the circumference direction is non-uniform. The pressure pulsation trends to rise gradually to reach the maximum value and then fall, basically following a sine-shape changing law. The times of transient pressure fluctuation change are equal to the times of rotor-stator interference between the vane and the guide vane. The closer monitoring point to the intersection surface between the vane and the guide blade is, the greater the pressure fluctuation is. Because of the attack angle, the speed of the impeller passageway first falls and then rises. The guide vane not only transfers the kinetic energy to pressure energy, but also effectively reduces the pressure pulsation amplitude. During the transition to small flow, flow reducing causes the secondary backflow to occur near the outlet of impeller and in turn leads the amplitude of flow velocity variation in the flow channel of impeller to increase with flow decrease.


Wang X.-L.,Jiangsu University | Yuan S.-Q.,Jiangsu University | Zhu R.-S.,Jiangsu University | Yu Z.-J.,Jiangsu Zhenhua Pump Manufacturing Co.
Hedongli Gongcheng/Nuclear Power Engineering | Year: 2013

The numerical simulation calculation of the transient flow characteristics of nuclear reactor coolant pump in the recessive cavitation transition process in the nuclear reactor coolant pump impeller passage is conducted by CFX, and the transient flow characteristics of nuclear reactor coolant pump in the transition process from reducing the inlet pressure at cavitation-born conditions to NPSHc condition is studied and analyzed. The flow field analysis shows that, in the recessive cavitation transition process, the speed diversification at the inlet is relative to the bubble increasing, and makes the speed near the blade entrance increase when the bubble phase region becomes larger. The bubble generation and collapse will affect the the speed fluctuation near the entrance. The vorticity close to the blade entrance gradually increasing is influenced by the bubble phase, and the collapse of bubble generated by cavitation will reduce the vorticity from the collapse to impeller outlet. Pump asymmetric structure causes the asymmetry of the flow, velocity and outlet pressure distribution within every impeller flow passage, which cause the asymmetry of the transient radial force. From the dimensionless t/T=0.6, the bubble phase starts to have impact on the impeller transient radial force, and results in the irregular fluctuations.

Loading Jiangsu Zhenhua Pump Manufacturing Co. collaborators
Loading Jiangsu Zhenhua Pump Manufacturing Co. collaborators