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  • Title/Summary/Keyword: Fuel pressure control

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Experimental Study on Heat Release in a Lean Premixed Dump Combustor using OH Chemiluminescence Images (희박 예혼합 덤프 연소기에서 OH 자발광을 이용한 열 방출에 관한 실험적 연구)

  • Moon, Gun-Feel;Lee, Jong-Ho;Jeon, Chung-Hwan;Chang, Young-June
    • Proceedings of the KSME Conference
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    • 2004.11a
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    • pp.1146-1151
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    • 2004
  • Measurements of OH chemiluminescence in an atmospheric pressure, laboratory-scale dump combustor at equivalence ratios ranging from 0.63 to 0.89 were reported. The signal from the first electronically excited state of OH to ground state was detected through a band-pass filter with an ICCD. The objectives of this study are two: One is to see the effects of equivalence ratio on global heat release rate and local Rayleigh index distribution. To get the local Rayleigh index distribution, the line-of-sight images were inverted by tomographic method, such as Abel de-convolution. Another aim is to investigate the validity of using OH chemiluminescence acquired with an ICCD as a qualitative measure of local heat release. For constant inlet velocity and temperature, the overall intensities of OH emission acquired at different equivalence ratio showed periodic and higher value at high equivalence ratio. OH intensity averaged over one period of pressure increased exponentially with equivalence ratio. Local Rayleigh index distribution clearly showed the region of amplifying or damping the combustion instability as equivalence ratio increased. It could provide an information/insights on active control such as secondary fuel injection. Finally, local heat release rate derived from reconstructed OH images were presented for typical locations.

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Performance Dispersion Analysis and Applications of Gas Generator Cycle Liquid Rocket Engine (가스발생기 사이클 액체 로켓 엔진의 성능 분산 해석 및 활용)

  • Nam, Chang-Ho;Cho, Won-Kook;Seol, Woo-Seok
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2006.11a
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    • pp.191-195
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    • 2006
  • It is definitely required to control dispersion of the rocket engine performance in order to accomplish the mission of a launch vehicle successfully. A performance dispersion analysis was conducted for a gas generator cycle liquid rocket engine and the required pressure drops were estimated for engine tunning. As a result, the vacuum thrust dispersion of the engine was from +9.1% to -8.7% and the mixture ratio deviated from +9.7% to -9.6% from the nominal value due to the errors of components and the engine inlet condition of propellants. The required pressure drop in the LOx line to the combustor is higher than in the fuel line for same mixture ratio change.

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Development of Gasoline Direct Swirl Injector (직접분사식 가솔린 선회분사기 개발에 관한 연구)

  • Park, Yong-Guk;Lee, Chung-Won
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.25 no.1
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    • pp.78-86
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    • 2001
  • The Gasoline Direct Injection(GDI) system has been highlighted due to the improvement of fuel consumption and the control of exhaust emission from gasoline engines. The GDI system includes a high injection pressure, smaller mean diameter, good spray characteristics and stability. We were interested in the development for gasoline direct swirl injector(GDSI) in which the swirler is specially designed with an incident angle. Nymerical analysis was utilized to investigate the internal flow of GDSI with a goal to determine the swirl incident angle and needle lift. Accordingly, it describes characteristics of a GDSI in which the flowrate and spray characteristics are satisfied. especially the spray tip penetration decreases, compared with other type GDI, mean diameter of droplets is from 20{\mu}{\textrm}{m} to 25{\mu}{\textrm}{m} and spray angle ranges from 64to 66.

A Study on Regenerative Braking for a Parallel Hybrid Electric Vehicle

  • Jang, Seong-Uk;Ye, Hun;Kim, Cheol-Su;Kim, Hyeon-Su
    • Journal of Mechanical Science and Technology
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    • v.15 no.11
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    • pp.1490-1498
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    • 2001
  • In this paper, a regenerative braking algorithm is presented and performance of a hybrid electric vehicle (HEV) is investigated. The regenerative braking algorithm calculates the available regenera tive braking torque by considering the motor characteristics, the battery SOC and the CVT speed ratio. When the regenerative braking and the friction braking are applied simultaneously, the friction braking torque corresponding to the regenerative braking should be reduced by decreasing the hydraulic pressure at the front wheel. To implement the regenerative braking algorithm, a hydraulic braking module is designed. In addition, the HEV powertrain models including the internal combustion engine, electric motor, battery, CVT and the regenerative braking system are obtained using AMESim, and the regenerative braking performance is investigated by the simulation. Simulation results show that the proposed regenerative braking algorithm contributes to increasing the battery SOC which results in the improved fuel economy. To verify the regenerative braking algorithm, an experimental study is performed. It is found from the experimental results that the regenerative braking hydraulic module developed in this study generates the desired front wheel hydraulic pressure specified by the regenerative braking control algorithm.

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Design of a Cylinder Valve Solenoid for a CNG Vehicle using Electromagnetic Field Analysis (전자기장 해석을 이용한 CNG 차량 용기용 밸브 솔레노이드의 설계)

  • Lee, Hyo-Ryeol;Ahn, Jung-Hwan;Shin, Jin-Oh;Kim, Hwa-Young
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.15 no.2
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    • pp.89-96
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    • 2016
  • Growing concerns regarding environmental pollution have increased the demand for green vehicles. Green vehicles include electric vehicles, compressed natural gas vehicles, fuel cell vehicles, and vehicles running on fuels such as bio diesel or an ethanol blend. CNG vehicles are equipped with a cylinder valve installed in a high-pressure vessel to control the CNG flow. For this purpose, the optimum design of cylinder valve solenoid is necessary to secure at driving a CNG vehicle. In this study, electromagnetic field analysis to ensure the reliable operation of the solenoid was conducted by using a Maxwell V15. The electromagnetic field analysis was performed by magnetostatic technique according to distance between magnetic poles in order to predict the attraction force. Finally, the attraction force was validated through comparison between the Maxwell results and the measurement results. From the results, the error of attraction force was found to be 2.85 N to 6.5 N under the testing conditions.

Effect of Surface Roughness on Weld-bonding Process using Heterogeneous Materials (델타스폿용접을 이용한 이종소재 웰드본딩공정 시 표면 거칠기 부여 가공방법의 영향)

  • Kim, Young-Hyun;Kim, Jaewoong;Kim, Jisun;Kim, Young-Gon;Pyo, Changmin
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.19 no.11
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    • pp.102-108
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    • 2020
  • The demand for lightweight materials and high-strength steel has rapidly increased to help reduce the weight of a vehicle body; it improves the fuel efficiency of automobiles and provides passenger safety. Additionally, as the material becomes thinner, the demand for its resistance against corrosion becomes higher. Hence, the application of the surface-treated steel sheet has surged rapidly. In this study, a weld bonding experiment using a delta spot welding machine is performed on a thin sheet of a different material (Al6061-T6/GA440). The thickness of the material was kept at 1 mm to reduce the weight of the automobile body parts. Additionally, the purpose of this study is to control the heat input by applying the welding conditions of a multi-stage pressure pattern to improve corrosion resistance shear strength. The analysis of nugget diameter measurement, shear tensile test, and salt spray test was performed to achieve the aim.

A Study on the Modeling of Fueling Hydrogen Tank in Vehicle Using Dispenser (디스펜서를 이용한 차량용 연료 탱크 수소 충전 모델링에 관한 연구)

  • Choi, Ji Ah;Ji, Sang Won;Jang, Ji Seong
    • Journal of Drive and Control
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    • v.19 no.2
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    • pp.36-44
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    • 2022
  • Hydrogen energy as an alternative source of energy has been receiving tremendous support around the world, and research is being actively conducted accordingly. However, most of the studies focus on hydrogen storage tanks and only are few studies on interpreting the hydrogen filling system itself. In this study, with reference to SAE J2601, a hydrogen fueling protocol, a simulation model was developed that can confirm the behavior of the vehicle's internal tank during hydrogen fueling. With respect to factors such as fuel supply temperature, ambient temperature, and pressure increase rate, the developed model can check the change of temperature and pressure in the tank and the state of hydrogen charging during hydrogen fueling. The validity of the developed simulation model was confirmed by comparing the simulation results with the experimental results presented in SAE J2601.

An Experiment Study on the Combustion Characteristics with BD20 according to Ultrasonic Energy Irradiation Duration and Injection Delay in a Diesel Engine (초음파 에너지 조사 시간과 분사지연에 따른 BD20의 디젤기관 연소특성에 관한 실험 연구)

  • Im, Seok-Yeon;Lee, Ho-Gil;Ryu, Jeong-In
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.4
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    • pp.38-46
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    • 2008
  • An object of this study is to understand the correlation between the characteristics of an engine performance and combustion characteristics, applying BD20 fuel reformed by ultrasonic energy irradiation to diesel engines. Before conducting the main experiment, an experiment was performed to determine the optimum injection timimg of reformed BD20 by ultrasonic energy irradiation. To control the duration of the ultrasonic energy irradiation, the capacity of an ultrasonic energy fuel supply system was tested with 550cc and 1100cc chambers. As the result of the analysis of the regular BD20 and reformed BD20 by ultrasonic energy irradiation, the BSFC and the Power of the reformed BD20 was improved 3% and 6%, respectively compared to those of non-irradiated BD20. When the fuel injection timing was delayed by 5, the engine power was improved by 3%, and the BSFC was improved by 2%. The maximum cylinder pressure of reformed BD20 was improved by a maximum of 6% in comparison to that of regular BD20, and demonstrated a synergistic effect of 3% by delaying the injection timing 5.

Experimental Study on Reduction of Emissions for Marine Diesel Engines with a Double Post Injection (선박용 디젤엔진에서 이단지연분사에 따른 배기 배출물 저감에 관한 실험 연구)

  • Lee, Won-Ju;Choi, Jae-Hyuk;Cho, Kwon-Hae
    • Journal of Advanced Marine Engineering and Technology
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    • v.39 no.4
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    • pp.418-424
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    • 2015
  • Marine Environment Protection Committee of the International Maritime Organization has decided to reinforce the NOx emission standards for ships passing an ECA(Emission Control Area) with Tier III standards from January 1, 2016. In this study, real-time measurements of the exhaust gas, cylinder pressure and fuel consumption were conducted at each load of a T/S Hanbada main engine of Korea Maritime and Ocean University, which is controlled by single injection and double post injection for reducing NOx emissions. The results showed that the quantity of CO2 and NOx increased in proportion to the engine load, whereas the CO concentration was inversely proportional to the engine load. In addition, double post injection decreased 10 % of P-max and reduced 25~30 % of the NOx emissions compared to single injection, whereas there was a trade-off relation, such as increase 3~5 % of SFOC (Specific Fuel Oil Consumption).

A Study on Buzz Margin and Thrust Control of Supersonic Engine using PI Controller (PI 제어기를 이용한 초음속 엔진 버즈마진 및 추력제어에 관한 연구)

  • Kong, Chang-Duk;Ki, Ja-Young;Kho, Seong-Hee
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2009.11a
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    • pp.573-577
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    • 2009
  • Dynamic behavior simulation of supersonic engine was performed and PI control algorithm was studied for the buzz control in the inlet and the thrust control. Firstly, required thrust was tracked according to the fuel flow control and then inlet pressure was regulated through the nozzle throat area control so that the buzz margin has the positive all the time. The control was performed according to the change of flight Mach number, altitude and angle of attack. The proportional gain and the integral gain for regulating the buzz margin was induced and simulated. In the results, it was confirmed and satisfied that control target in the operating area was changed the angle of attack from 0 to 10 at the flight Mach number of 2.1~3.0.

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