TY - JOUR
T1 - Deformation of nozzle, needle, and control plunger of solenoid fuel injector under high injection pressure
AU - Wu, Dong Wei
AU - Sun, Bai Gang
AU - Xu, Dan
N1 - Publisher Copyright:
© IMechE 2018.
PY - 2019/6/1
Y1 - 2019/6/1
N2 - Future diesel engines require the use of solenoid fuel injection system with the ultra-high pressure of more than 2000 bars. The nozzle, needle, and control plunger of the solenoid injector deform under high pressure. This deformation affects the movement characteristics of the needle, thereby influencing the precise control of fuel injection. A test rig is set up to investigate the structural deformation and influencing factors of the solenoid injector under high pressure. The structural deformation of nozzle, needle, and control plunger under different pressures can be obtained by measuring the displacement of the upper end of the control plunger in the axial direction. The experimental longitudinal deformation of nozzle, needle, and control plunger of the solenoid injector, which was selected for the study, reaches 0.109 mm under the pressure of 1600 bars. This value is close to 40% of the maximum needle lift, which is 0.3 mm. Thus, the deformation can no longer be ignored. In view of the solenoid injector deformation under high injection pressure, a three-dimensional calculation model is established. The calculated results are compared with the experimental data. The calculation total longitudinal deformation of nozzle, needle, control plunger, and contact surface reaches 0.238 mm under the pressure of 2500 bars. The structure deformation of solenoid injector with different materials or geometric parameters is calculated under the pressure of 100–2500 bars. The deformation with new materials is 0.198 mm and the deformation with new geometric parameters is 0.0333 mm under the pressure of 2500 bar. These calculations show that the use of shorter control plungers, shorter needles, and larger wall thickness nozzles can effectively reduce injector deformation under high pressure. The results of the study can provide guidance on injector design, which can work with high injection pressure and much accurate injection.
AB - Future diesel engines require the use of solenoid fuel injection system with the ultra-high pressure of more than 2000 bars. The nozzle, needle, and control plunger of the solenoid injector deform under high pressure. This deformation affects the movement characteristics of the needle, thereby influencing the precise control of fuel injection. A test rig is set up to investigate the structural deformation and influencing factors of the solenoid injector under high pressure. The structural deformation of nozzle, needle, and control plunger under different pressures can be obtained by measuring the displacement of the upper end of the control plunger in the axial direction. The experimental longitudinal deformation of nozzle, needle, and control plunger of the solenoid injector, which was selected for the study, reaches 0.109 mm under the pressure of 1600 bars. This value is close to 40% of the maximum needle lift, which is 0.3 mm. Thus, the deformation can no longer be ignored. In view of the solenoid injector deformation under high injection pressure, a three-dimensional calculation model is established. The calculated results are compared with the experimental data. The calculation total longitudinal deformation of nozzle, needle, control plunger, and contact surface reaches 0.238 mm under the pressure of 2500 bars. The structure deformation of solenoid injector with different materials or geometric parameters is calculated under the pressure of 100–2500 bars. The deformation with new materials is 0.198 mm and the deformation with new geometric parameters is 0.0333 mm under the pressure of 2500 bar. These calculations show that the use of shorter control plungers, shorter needles, and larger wall thickness nozzles can effectively reduce injector deformation under high pressure. The results of the study can provide guidance on injector design, which can work with high injection pressure and much accurate injection.
KW - Diesel engine
KW - accurate injection
KW - deformation
KW - fluid-structure interaction
KW - solenoid injector
KW - ultra-high pressure
UR - http://www.scopus.com/inward/record.url?scp=85049865248&partnerID=8YFLogxK
U2 - 10.1177/0954407018786354
DO - 10.1177/0954407018786354
M3 - Article
AN - SCOPUS:85049865248
SN - 0954-4070
VL - 233
SP - 1767
EP - 1782
JO - Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
JF - Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering
IS - 7
ER -
