Unsteady Flow Modeling Using Transient Rotor–Stator Interface

Izmaylov, R; Lopulalan, Henry D.; Norimarna, Gertruida S.

doi:10.1115/gt2013-95788

Cited by 2 publications

(2 citation statements)

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“…The inlet boundary condition was the flow inlet, the flow rate was set to 10.66 m 3 /s, the outlet boundary condition was the pressure outlet, the pressure value was set to 1 atm, the solid wall was a non-slip wall, and the convergence accuracy was set to 1.0 × 10 −5 . The interface between the calculation domain of the impeller and the calculation domain of the inlet channel and the calculation domain of the guide vane body was set as the dynamic and static interface, and the Transient Rotor Stator interface type was used for the unsteady calculation [14,19,20]. The interface of another computing domain was set as the static interface, and the None interface model was adopted.…”

Section: Calculation Methods and Boundary Conditionsmentioning

confidence: 99%

Numerical Study on Pressure Pulsation in a Slanted Axial-Flow Pump Device under Partial Loads

Yang

Chang

et al. 2021

Processes

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The 30° slanted axial-flow pump device is widely used in agricultural irrigation and urban drainage in plains areas of China. However, during the actual operation process, the 30° slanted axial-flow pump device is prone to vibration, noise, cracks in the blades, and other phenomena that affect the safe and stable operation of the pump device. In order to analyze the flow pressure pulsation characteristics of the 30° slanted axial-flow pump device under different flow conditions, the time–frequency domain analysis method was used to analyze the pressure pulsation of each flow structure of the 30° slanted axial-flow pump device. The results showed that the internal pulsation law of the elbow oblique inlet flow channel is similar. At the 1.2 Qbep condition, the amplitude fluctuation of the pressure pulsation was small, and the main frequency is 4 times the rotating frequency. The monitoring points at the outlet of the elbow oblique inlet flow channel were affected by the impeller rotation, and the pressure pulsation amplitude was larger than that inside the elbow oblique inlet flow channel. The pressure fluctuation of each monitoring point at the inlet surface of the impeller was affected by the number of blades. There were four peaks and four valleys, and the main frequency was 4 times the rotating frequency. The amplitude of pressure fluctuation increased gradually from the hub to the rim. The main frequency of pressure fluctuation at each monitoring point of the impeller outlet surface was 4 times of the rotating frequency, and the low frequency was rich. The amplitude of pressure fluctuation was significantly lower than that of the impeller inlet. With the increase of flow rate, the peak fluctuation of pressure coefficient decreased gradually, and the amplitude of pressure fluctuation tended to be stable. Under 0.8 Qbep and 1.0 Qbep conditions, the large fluctuation of the pressure fluctuation amplitude on the outlet surface of the guide vane was mainly affected by the low-frequency fluctuation. Under the 1.2 Qbep condition, the pressure fluctuation amplitude changed periodically.

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Section: Calculation Methods and Boundary Conditionsmentioning

confidence: 99%

Numerical Study on Pressure Pulsation in a Slanted Axial-Flow Pump Device under Partial Loads

Yang

Chang

et al. 2021

Processes

View full text Add to dashboard Cite

show abstract

“…The interfaces between impeller calculation domain and campaniform inlet conduit calculation domain and guide vane calculation domain are set as static and dynamic interface. Transient Rotor Stator interface type is used for unsteady calculation of pump device [19][20][21]. The interface between other calculation domains is set as static and static interface, and None interface model is used.…”

Section: Calculation Methods and Boundary Conditionsmentioning

confidence: 99%

Analysis of Timing Effect on Flow Field and Pulsation in Vertical Axial Flow Pump

Yang

Chang

Yuan

et al. 2021

JMSE

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Vertical axial flow pump device has the characteristics of large flow and low head, which is widely used in pumping station projects with head of 3–9 m. In order to study the influence of the timing effect of the impeller relative flow channel and guide vane on the flow field and pulsation in the axial flow pump device, the whole flow channel of the vertical axial flow pump device was taken as the research object. The reliability of the numerical simulation was verified by physical model test. The flow field characteristics and pressure pulsation characteristics of the inlet and outlet regions of the impeller, the guide vane and the campaniform inlet conduit at different timing positions of the impeller under different flow rates were analyzed. The results show that the pressure coefficient distribution of the impeller inlet of the vertical axial flow pump device presents four high-pressure areas and four low-pressure areas with the rotation of the impeller. The pressure pulsation at the inlet and outlet of the impeller is mainly affected by the rotation of the impeller, and the main frequency is 4 times the rotation frequency amplitude of pressure pulsation decreases with the increase of flow rate. When the flow rate increased from 0.8 Qbep to 1.2 Qbep, the average velocity circulation at the guide vane outlet decreased by 12%; there is an obvious negative value region of the internal regularized helicity of the guide vane. When the flow rate increases from 0.8 Qbep to 1.2 Qbep, the amplitude of the pressure pulsation coefficient at the outlet of the guide vane decreases gradually, with a decrease of 94%. When the flow rate is 1.2 Qbep, the main frequency and the secondary frequency of the pressure pulsation are both low-frequency, with obvious low-frequency pulsation characteristics. Under the small flow condition of 0.8 Qbep, the outlet flow fluctuation of seven guide vane was 18.9% on average, and the flow variation of each guide vane was large. Under the optimal flow condition of 1.0 Qbep and large flow condition of 1.2 Qbep, the outlet flow fluctuation of 7 guide vane is 4.7% and 0.56% on average, and the flow change of each guide vane is stable. The outlet flow of the guide vane is mainly concentrated in two guide vane slots of the guide vane, and the flow ratios are 30.56%, 30.14% and 29.16% under three flow conditions, respectively. The research results provide a scientific basis for the optimization design and stable operation of vertical axial flow pump device.

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Unsteady Flow Modeling Using Transient Rotor–Stator Interface

Cited by 2 publications

References 0 publications

Numerical Study on Pressure Pulsation in a Slanted Axial-Flow Pump Device under Partial Loads

Numerical Study on Pressure Pulsation in a Slanted Axial-Flow Pump Device under Partial Loads

Analysis of Timing Effect on Flow Field and Pulsation in Vertical Axial Flow Pump

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