TY - JOUR
T1 - Comparative study on steady and unsteady flow characteristics in control valve for the unit pump
AU - Qiu, Tao
AU - Dai, He Fei
AU - Lei, Yan
AU - Cao, Chun Lei
N1 - Publisher Copyright:
© 2016, Editorial Office of the Transaction of CSICE. All right reserved.
PY - 2016/11/25
Y1 - 2016/11/25
N2 - Control valve is one critical component of electronic unit pump fuel system. Control valve controls the pressure build-up within the high-pressure fuel line through rapid opening, which is a dynamic process. On the basis of theoretical analysis, there are two key reasons for the unsteady flow within the control valve:one is the acceleration of fuel which is induced by the valve needle's dynamic movement, and another is the acceleration of fuel flow due to the change of the inlet/outlet pressure, and this acceleration of fuel flow enhances the inertia force. Comparison of the flow field characteristics of the control valve are made under both steady and dynamic conditions by simulation. Results show that with the increase of valve opening, the cavitation becomes stronger under the unsteady condition but cavitation declines under the steady condition. There are significant differences between steady and unsteady conditions on the flow velocity during the whole opening process. In small valve needle opening, the flow capacity of steady condition is higher than that of unsteady condition;however, with the increase of valve opening, the flow capacity of unsteady become greater than that of steady flow.
AB - Control valve is one critical component of electronic unit pump fuel system. Control valve controls the pressure build-up within the high-pressure fuel line through rapid opening, which is a dynamic process. On the basis of theoretical analysis, there are two key reasons for the unsteady flow within the control valve:one is the acceleration of fuel which is induced by the valve needle's dynamic movement, and another is the acceleration of fuel flow due to the change of the inlet/outlet pressure, and this acceleration of fuel flow enhances the inertia force. Comparison of the flow field characteristics of the control valve are made under both steady and dynamic conditions by simulation. Results show that with the increase of valve opening, the cavitation becomes stronger under the unsteady condition but cavitation declines under the steady condition. There are significant differences between steady and unsteady conditions on the flow velocity during the whole opening process. In small valve needle opening, the flow capacity of steady condition is higher than that of unsteady condition;however, with the increase of valve opening, the flow capacity of unsteady become greater than that of steady flow.
KW - Cavitation
KW - Electronic unit pump
KW - Hydraulic balance valve
KW - Unsteady flow
UR - https://www.scopus.com/pages/publications/85002560027
U2 - 10.16236/j.cnki.nrjxb.201606077
DO - 10.16236/j.cnki.nrjxb.201606077
M3 - Article
AN - SCOPUS:85002560027
SN - 1000-0909
VL - 34
SP - 556
EP - 561
JO - Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines)
JF - Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines)
IS - 6
ER -