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흡기관 분사 방식 연료 레일의 압력 맥동 저감을 위한 연료 레일 형상 최적화
이상철(Sangcheol Lee),정재엽(Jaeyoup Jung),김홍기(Honggi Kim) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Fuel Line Hammer is defined as the audible noise heard in the vehicle passenger compartment resulting from fuel pressure pulsations in the fuel subsystem. The pressure pulsations are a result of injector-firing events and fuel line dynamics. The pressure pulsations consist of a multiple frequencies. Low frequency pulsations are the result of injector firing. High frequency pulsations are a result of line dynamics. Line dynamics are impacted by line diameter, length and stiffness of the fuel system components. Since the fuel feed line diameter and length are typically set by vehicle architecture, the stiffness (or compliance) of the fuel subsystem components is one of the few fuel system design variables available for effecting the pressure pulsations. Some kind of designs for fuel rails have been developed and introduced to reduce fuel pulsation for MPI (intake manifold port injection) system such as fuel rails with external damper or internal damper or integrated damping effect (called as self-damped fuel rail) in accordance with engine room design and noise requirements. Fuel rails integrated with internal dampers are introduced to reduce fuel pulsation effectively now a days instead of self-damped fuel rails even though they lead cost increase significantly. However some papers have introduced that the fuel rails with integrated damping effect (self-damped fuel rail) can reduce fuel pulsation effectively. This study focused on finding key parameter on fuel rail design with integrated damping effect to reduce fuel pulsation experimentally. It was found that the shape and volume are key factor to reduce fuel pulsation and the shape of fuel rail is more effective than the volume of fuel rail. : Static response, minimum the best, was characterized as parameter design.
신준 한국기계기술학회 2020 한국기계기술학회지 Vol.22 No.1
This paper is one of basic studies for development of fuel rail to secure strength of GDI system. The fuel rail supports high pressure of 200~250bar and stores fuel while reducing pulsation during injection. Therefore, the structural characteristics of the conventional fuel rail was investigated with respect to stress and displacement. Then, the study focused on reducing stress concentration on fuel rail design to enhance the strength of each components. It was found that the maximum stress was not affected to the dimensions of taper lengths and angles of holes for fuel pipe. Also, it was found that the shape of holes for fuel pipe was key factor to reduce maximum stress, and the bridge between injector and mounting holder was effective structure to reduce the stress of injectors and displacement of the fuel rail system.
Fuel Rail의 설계 인자별 압력맥동 특성에 관한 연구
허형석(Hyungseok Heo),배석정(Sukjung Bae),이헌균(Heonkyun Lee),송경석(Kyungsuk Song),박시우(Seewoo Park),김보겸(Bokyoum Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In general, pulsation damper is installed in fuel rail for conventional MPI engine to decrease undesirable cabin noise. However, pulsation damper is so expensive that there are prevailing studies to reduce fuel pressure pulsations with integrated damping effect. This paper is one of basic studies for development of fuel rail to abate pulsations with self-damping effect. Primarily, the pressure pulsation characteristics was investigated with aspect ratio of cross section, wall thickness, and materials of fuel rail. A high aspect ratio or thin wall was found to absorb the pressure pulsations effectively. But volume effects on the fuel pressure pulsation reductions were not especially significant than cross section effects because volume increment rate is larger than pressure pulsation reduction rate. The fuel rail made of aluminum is effective for reduction of pressure pulsation than that of low-carbon steel. Pressure change period increases on the basis of same lengths of supply line and fuel rail as the volume is enlarged and/or the thickness of wall is thinned.
유체-구조 연성해석과 유체해석의 비교를 통한 연료레일에서의 맥동저감 특성 연구
심정연(Jeong-Yeon Shim),김동현(Dong-Hyun Kim),조윤태(Yun-Tae Cho) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
Complex pressure pulsation phenomenon in fuel rails is generated by rapid opening and closing of injectors and it commonly causes undesirable noise. In the previous study, fluid-structure interaction analyses based on FEM had been conducted to examine the pulsation damping characteristics for different shapes of fuel rails. The results showed that the fuel rail with a high aspect ratio rectangular cross section seems to be best in order to reduce the pressure pulsations as shown in the previous experimental test by Mizuno, K. et al. In this study, CFD analyses (the fuel rail is regarded as a rigid structure.) have been performed to compare with the fluid-structure interaction analyses. And also the modal analyses for the fuel rails are performed to examine the correlation between the structural behavior and pressure pulsation.
특성 방법을 이용한 Fuel Rail 압력맥동 특성 해석 프로그램 개발
배석정(Sukjung Bae),허형석(Hyungseok Heo),이헌균(Heonkyun Lee),송경석(Kyungsuk Song),박시우(Seewoo Park),김보겸(Bokyoum Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In the return less fuel rail system of MPI engine, pulsation damper is commonly mounted for the purpose of diminution of pressure pulsations and jarring noise. But, pulsation damper is too expensive for all the advantage. Therefore, the studies are on the increase to develop fuel rail to diminish pulsations with integrated damping effect. This paper deals with numerical approach using method of characteristics to design fuel rail to reduce pulsations with self-damping effect. Primarily, the pressure pulsation characteristics is investigated with aspect ratio of cross section, wall thickness, and materials of fuel rail. Secondarily, sweep test simulation of fuel rail for in-line engine is performed as engine speed increases to find out certain engine speed where pressure pulsation peak is observed. A high aspect ratio or thin wall is found to absorb the pressure pulsations effectively. The fuel rail made of aluminum is effective for reduction of pressure pulsation than that of low-carbon steel. Pressure pulsation peak is observed at the vicinity of certain engine speed where single-injector oil hammer simulation predicts that resonance would occur.
COUPLED SIMULATION OF COMMON RAIL FUEL INJECTION AND COMBUSTION IN A HSDI DIESEL ENGINE
Sukyoung Lee(이석영) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
In this study, the coupled simulation of fuel injection model and three-dimensional KIVA-3V code was tried to develop of the algorism for predicting the effects of varying fuel injection parameter on the characteristic analysis of fuel injection and emissions. The numerical analysis was done by STAR-CD code in order to calculate the intake air flow, and the combustion characteristics is examined by KIV A-3V code including the conditional moment closure (CMC) model to predict turbulent mean reaction rate. Parametric investigation with respect to twelve relevant injection parameters shows that there is a significant advantage in varying control chamber orifice diameter, needle valve spring constant and nozzle chamber orifice diameter with respect to minimizing the NOx and soot emissions. Consequently, in order to design the fuel injection system for reducing the specific emissions, it seems reasonable to suppose to be optimized the fuel injection system.
정적연소기에서 분위기 압력에 따른 Diesel-DME 혼합연료의 분무 특성에 관한 연구
양지웅(Jiwoong Yang),이세준(Sejun Lee),임옥택(Ocktaeck Lim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
The aim of this study was compared the spray characteristics of a typical fuel(100% Diesel,DME) and Diesel-DME blended fuel in Constant Volume Combustion Chamber(CVCC). typical fuel(100% Diesel,DME) and Diesel-DME blended fuel spray characteristics were investigated about varied ambient pressure and fuel injection pressure using the common rail fuel injection system when the fuel mixture ratio is varied. The fuel injection quantity and spray characteristics were measured. the spray characteristic research parameters were spray shape, penetration length, and spray angle at seven nozzle hole injector. common types of injectors were used(bosch). Three types of blended fuel by the mole fraction was used. The typical fuel(100% Diesel,DME) and The blended fuel by mixture ratio 95:5, 90:10 (Diesel,DME) were used. The ambient pressure was varied by 5MPa from 35 to 70MPa when the ambient Pressure was varied 0,2.5 and 5MPa. The result of using Diesel-DME blended fuel. It can be confirmed from the experiment on spray characteristics of Diesel-DME blended fuels that the increased Diessel blending ratio induced the increase of the spray penetration length. The spray angle slightly increased by the blending of DME fuel. In the experiment on atomization characteristics, the DME blending caused the improvement of the diesel atomization performance.