The influence of flow restrictor parameters on pressure fluctuation characteristics at injector inlet
ZHANG Ziwei
ZHANG Weimin
YANG Guichun
Abstract：Taking a certain type of diesel engine's high flow common rail system as the research object,a one-dimensional hydraulic simulation model of the common rail system with integrated flow restrictor is constructed using AMESim software,and the influence of flow restrictor structural parameters on pressure fluctuation characteristics at injector inlet is simulated and studied.The simulation results show that increasing the diameter of flow restrictor valve core can reduce the injection rate and the amplitude of fluctuations.In addition,increasing the diameter of throttle hole,the inner diameter of valve body,and the clearance between the valve cores of flow restrictor can increase the injection rate and the amplitude of pressure fluctuations at the inlet of injector.In the design process of flow restrictor and under the premise of meeting the fuel injection characteristics,the diameter of flow restrictor valve core should be appropriately increased,the diameter of throttle hole,the inner diameter of valve body,and the clearance between the valve cores should be reduced to reduce the pressure fluctuation at the inlet of fuel injector and stabilize the pressure propagation inside common rail system.
Keywords：flow restrictorstructural parameterpressure fluctuationscommon rail
Publication Date：2025-01-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 9-15 )