Dynamic flow behavior during fuel-offloaded process in control valve for unit pump fuel system

Qiu, Tao; Dai, Houde; Lei, Yan; Xiao, Song; Cao, Chen; Lai, Ming Chia

doi:10.1016/j.applthermaleng.2016.05.171

Cited by 16 publications

(16 citation statements)

References 11 publications

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“…The effect of valve needle speed on cavitation characteristics Figure 3 shows the cavitation of different valve needle speeds under the condition of given needle lifts. For the definition of the relative cavitation intensity, it is similar to the relative brightness in Qiu et al 4 It shows that cavitation mainly locates in two regions. One is the conical region which is marked by a red box, and the other one is the downstream of the conical region.…”

Section: Results Discussionmentioning

confidence: 70%

“…Also, under the same needle lift, as the valve needle speed becomes larger, the cavitation in both the conical region and the downstream of the conical region becomes weaker. According to Qiu et al, 4 cavitation in the conical region is induced because the fluid velocity increases and the pressure dramatically drops, while cavitation in the downstream of the conical region is induced by the vortexes which are induced by fluid separation from the wall. Figure 4 shows the velocity streamline.…”

Section: Results Discussionmentioning

confidence: 99%

“…The optical test results, the grid independence analysis, and the model validation are shown in the author's previous published paper. 4…”

Section: Model Establishment and Validationmentioning

confidence: 99%

“…These characteristics cause the inner flow within the control valve to be extremely complicated, and there is great turbulence, forming strong vortex and inducing cavitation. [2][3][4] Initially, the inner flow of the control valve may cause great pressure fluctuations and noise, vibrations, efficiency loss, and erosion damage on surfaces of the mechanical components that will reduce valve reliability and control precision. 5 Compounding these factors, the inner flow can cause abnormal hydrodynamic force resulting in erratic movement of the valve.…”

Section: Introductionmentioning

confidence: 99%

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Effects of valve needle speed on flow characteristics in control valve for unit pump fuel system

Qiu

Dai

Lei

et al. 2018

Advances in Mechanical Engineering

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The control valve of a diesel unit pump fuel system adjusts the pressure of the high-pressure fuel line through rapid opening to achieve fuel cutoff control. Previous research shows that the inner flow of the control valve is a dynamic cavitation flow process, and both the inlet/outlet pressures and valve lift have great influence on this process. However, the effect of the valve needle speed on the flow characteristics is not clear. This study presents an investigation of the effect of the valve needle speed on the flow characteristics within the control valve region during the fuel offloading process of a diesel unit pump fuel system based on a homogenous two-phase unsteady flow numerical model. The results show that under the condition of same inlet/outlet pressures, as the valve needle speed increases, the cavitation intensities of both the conical region and the conical downstream region are weakened. The effects of the valve needle speed on the mass flow rate under the condition of small valve needle opening can be ignored; under the condition of large valve needle opening, the higher the valve needle speed is, the greater the mass flow rate is.

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Section: Results Discussionmentioning

confidence: 70%

Section: Results Discussionmentioning

confidence: 99%

“…The optical test results, the grid independence analysis, and the model validation are shown in the author's previous published paper. 4…”

Section: Model Establishment and Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of valve needle speed on flow characteristics in control valve for unit pump fuel system

Qiu

Dai

Lei

et al. 2018

Advances in Mechanical Engineering

Self Cite

View full text Add to dashboard Cite

show abstract

“…Wu et al [23] developed two CFD steady-state methods to obtain the flow-pressure characteristics of a pressure control valve and compared the results of both methods with the experimental data. Qiu et al [24] developed a twodimensional (2D) transient model of a control valve for studying the dynamic flow behavior. Li et al [25] used the dynamic mesh technique to simulate the movement of a solenoid valve, and conducted a transient CFD simulation to analyze the dynamic characteristics of the valve.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Dynamic Characteristics of Port Valves in a Diaphragm Pump for Exhaust Gas Treatment System by FSI Modeling

et al. 2019

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The motions of port valves are a primary aspect to consider in achieving superior reliability and performance of a diaphragm pump, and it is necessary to perform detailed analyses to stabilize the motions of port valves. A transient 3D fluid-structure interaction (FSI) model was proposed to simulate a complete working process of a diaphragm pump and the motions of port valves. The dynamic mesh technique was used, and the deformation of the diaphragm was considered. Detailed descriptions of the FSI model creation development and the simulation methodology for the diaphragm pump were provided. Based on the FSI model, the influences of the back pressure and pump speed on the dynamic characteristics of port valves were analyzed, and the flow rate of the prototype was tested under different conditions on a test rig. The simulation results indicate that an increase in the back pressure and pump speed can lead to a reduction in the flow rate. The motions of the port valves are dependent on the back pressure and pump speed, and the deformation of the diaphragm is only dependent on the back pressure. The opening lag angles of the port valves increase significantly as the back pressure increases, but they are independent of the pump speed. In addition, the opening velocities of the port valves increase with increasing back pressure and pump speed. Finally, the simulation results also show agreement with the experimental data, and the FSI simulation method can predict the dynamic characteristics of port valves in a diaphragm pump. INDEX TERMS Diaphragm pump, port valves, dynamic characteristics, fluid structure interaction (FSI), dynamic mesh technique.

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Experimental and numerical study on the effects of the solenoid valve motion on the fuel pressure fluctuations for electronic unit pump systems of diesel engines

et al. 2017

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Dynamic flow behavior during fuel-offloaded process in control valve for unit pump fuel system

Cited by 16 publications

References 11 publications

Effects of valve needle speed on flow characteristics in control valve for unit pump fuel system

Effects of valve needle speed on flow characteristics in control valve for unit pump fuel system

Investigation on the Dynamic Characteristics of Port Valves in a Diaphragm Pump for Exhaust Gas Treatment System by FSI Modeling

Experimental and numerical study on the effects of the solenoid valve motion on the fuel pressure fluctuations for electronic unit pump systems of diesel engines

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