• Title/Summary/Keyword: Heavy duty injector

Search Result 15, Processing Time 0.032 seconds

A Comprehensive Study on Fuel Injector Test Bench for Heavy Duty Engine

  • Das, Shubhra Kanti;Thongchai, Sakda;Lim, Ocktaeck
    • Journal of ILASS-Korea
    • /
    • v.20 no.3
    • /
    • pp.195-201
    • /
    • 2015
  • This study discusses a fuel injector test bench containing a mechanical type fuel supply system for heavy duty diesel engine. The main focus of this study was to evaluate the design stability of the test bench, which basically measures the injector durability of a multi-hole heavy duty injector by using pure diesel as a test fuel. In this experiment, diesel spray was controlled by a specially designed control box and all the experiments were carried out to measure e.g. fuel injection pressure and fuel injection quantity to understand the injection status which is interlinked with the stability factor of total test bench design. Also, the durability test was performed to understand the heavy duty operation lastingness of the designed system and the flow rate of the installed distributor pump in the fuel supply system of this studying test bench was compared with LO-1 and LO-2 pump. The results of the above mention tests revealed that the injector test bench design and control system can serve the purpose for heavy duty injector.

Development of High Flow MPI Gas Injector for Heavy Duty Natural Gas Engine (대형 천연가스 엔진의 고유량 MPI 분사기 개발)

  • Lee, Seok-Hwan;Lee, Jin-Wook;Jee, Kang-Hoon;Choi, Min-Ho;Roh, Yun-Hyun
    • Journal of the Korean Institute of Gas
    • /
    • v.13 no.1
    • /
    • pp.28-33
    • /
    • 2009
  • Natural gas is the world's most plentiful combustible fuel, abundantly acailable in all continent. A fuel injector designed specifically for low energy density gaseous fuels has been developed. The injector incorporates design features that are necessary to optimize the performance for fuels such as CNG, LNG. Gaseous fuel injectors have a decisive influence upon starting performance, driveability, fuel consumption and exhaust emissions. A gaseous fuel injector has been developed to cope with the considerably larger volume flow rates and the developed gaseous fuel injector could be used at heavy duty natural gas engine. The static flow of injectors at various inlet pressure was directly proportional and the controllability showed great performance.

  • PDF

Numerical Study on the Injector Shape and Location of Urea-SCR System of Heavy-duty Diesel Engine for Preventing $NH_3$ Slip (대형 디젤엔진용 SCR 시스템의 암모니아 슬립 억제를 위한 인젝터의 형상 및 위치에 관한 수치적 연구)

  • Jeong Soo-Jin;Lee Sang Jin;Kim Woo-Seung;Lee Chun Beom
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.14 no.1
    • /
    • pp.68-78
    • /
    • 2006
  • In the past few years, considerable efforts have been directed towards the further development of Urea-SCR(selective catalytic reduction) technique for diesel-driven vehicle. Although urea possesses considerable advantages over Ammonia$(NH_3)$ in terms of toxicity and handling, its necessary decomposition into Ammonia and carbon dioxide complicates the DeNOx process. Moreover, a mobile SCR system has only a short distance between engine exhaust and the catalyst entrance. Hence, this leads to not enough residence times of urea, and therefore evaporation and thermolysis cannot be completed at the catalyst entrance. This may cause high secondary emissions of Ammonia and isocyanic acid from the reducing agent and also leads to the fact that a considerable section of the catalyst may be misused for the purely thermal steps of water evaporation and thermolysis of urea. Hence the key factor to implementation of SCR technology on automobile is fast thermolysis, good mixing of Ammonia and gas, and reducing Ammonia slip. In this context, this study performs three-dimensional numerical simulation of urea injection of heavy-duty diesel engine under various injection pressure, injector locations and number of injector hole. This study employs Eulerian-Lagrangian approach to consider break-up, evaporation and heat and mass-transfer between droplet and exhaust gas with considering thermolysis and the turbulence dispersion effect of droplet. The SCR-monolith brick has been treated as porous medium. The effect of location and number of hole of urea injector on the uniformity of Ammonia concentration distribution and the amount of water at the entrance of SCR-monolith has been examined in detail under various injection pressures. The present results show useful guidelines for the optimum design of urea injector for reducing Ammonia slip and improving DeNOx performance.

Simulation Study for the Performance Improvement of the Injector Module for Heavy-duty CNG Engines (대형 CNG 엔진용 인젝터 모듈의 성능 개선을 위한 연구)

  • Kim, Yong-Rae;Park, Won-A;Kim, Chang-Gi;Lee, Jang-Hee
    • Journal of the Korean Institute of Gas
    • /
    • v.20 no.4
    • /
    • pp.1-6
    • /
    • 2016
  • A fuel supply system of heavy-duty CNG engine is composed as a module structure which is integrated by about 6 injectors. There are only one input and output passage for gas fuel supply in this injector module. The response performance for transient operation of an CNG engine is very poor because only one output fuel supply line is connected to the intake pipe after a throttle valve. In this study, a new guideline and internal flow design for the CNG injector module is suggested for the improvement of response performance by fluid dynamic simulations. As a result, the response performance of gas fuel supply can be improved by decreasing the total volume of internal flow passages and a same distance design from each injector to the exit of module shows good response performance and acquirement of linearity of fuel supply. But the injection order has little influence to injection performances.

Spray characteristics and performance of pressure swirl simplex injector for heavy duty industrial gas turbines (대형가스터빈용 단일 압력 선회식 연료분사기의 분무 특성 및 성능 평가)

  • Seok, Jungmin;Jeong, Hanjin;Choi, Inchan;Kim, Jaiho;Lee, Sanghoon
    • Proceedings of the Korean Society of Propulsion Engineers Conference
    • /
    • 2017.05a
    • /
    • pp.892-895
    • /
    • 2017
  • As a component development of heavy duty industrial gas turbine combustor development program, pressure swirl simplex injector was designed and tested to figure out spray characteristics and performance. Injector flow rate as a function of pressure drop was measured and compared to the design target. Also spray shape was analyzed qualitatively and spray cone angle was measured from spray visualization image using shadowgraph. The flow test result showed that the injector was designed and manufactured correctly according to the design target and spray cone angle was measured from shadowgraph result. As a next step, PDA (Phase Doppler Anemometry) measurement is planned to figure out more specific spray performance and characterization.

  • PDF

Combustion Characteristics of Common Rail System by Using a Heavy Duty Transparent Engine (Common Rail을 이용한 대형 디젤 가시화엔진에서의 연소특성)

  • Kim, Y.M.;Lee, J.H.;Kim, S.H.;Lee, W.G.;Hong, C.H.;Choi, B.C.
    • Proceedings of the KSME Conference
    • /
    • 2001.06d
    • /
    • pp.896-902
    • /
    • 2001
  • To meet strict emission regulation while improving engine performances, common rail injection system which is suitable for electronic control, and capable of controlling injection quantity, timing, rate and pressure individually as well as realizing high pressure has been developed. At present study, a 8L DI diesel engine was converted to a single-cylinder experimental engine allowing optical access through an extended piston and a prototype of common rail injector in progress was applied to the engine. The combustion characteristics of the engine were analysed by using direct images and characteristics of the injector were analysed. We can not say that the results are always the same to general common rail injection system but that they are just characteristics of specific prototype injector.

  • PDF

Optimization of Heavy-Duty Diesel Engine Operating Parameters Using Micro-Genetic Algorithms (유전알고리즘을 이용한 대형 디젤 엔진 운전 조건 최적화)

  • Kim, Man-Shik;Liechty, Mike P.;Reitz, Rolf D.
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.13 no.2
    • /
    • pp.101-107
    • /
    • 2005
  • In this paper, optimized operating parameters were found using multi-dimensional engine simulation software (KIVA-3V) and micro-genetic algorithm for heavy duty diesel engine. The engine operating condition considered was at 1,737 rev/min and 57 % load. Engine simulation model was validated using an engine equipped with a high pressure electronic unit injector (HEUI) system. Three important parameters were used for the optimization - boost pressure, EGR rate and start of injection timing. Numerical optimization identified HCCI-like combustion characteristics showing significant improvements for the soot and $NO_X$ emissions. The optimized soot and $NO_X$ emissions were reduced to 0.005 g/kW-hr and 1.33 g/kW-hr, respectively. Moreover, the optimum results met EPA 2007 mandates at the operating point considered.

Reduction of Exhaust Emissions Using Various Injector Configurations in Low Temperature Diesel Combustion (분사기 형상 변경을 통한 저온 디젤 연소의 배기 배출물 저감)

  • Jung, Yong-Jin;Jang, Jin-Young;Park, Jung-Seo;Bae, Choong-Sik;Kim, Duk-Sang
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.19 no.4
    • /
    • pp.16-23
    • /
    • 2011
  • Low temperature combustion is one of the advanced combustion technology in an internal combustion engine to reduce soot and nitrogen oxides simultaneously. In present experiment three kinds of injector were used to investigate the influence of injection angle and number of nozzle holes on the low temperature combustion in a heavy duty diesel engine. Low temperature diesel combustion is realized from the exhaust gas recirculation rate of 60%. Indicated mean effective pressure of low temperature combustion corresponds to the 70% level of conventional diesel engine combustion. Reduction of hydrocarbon and carbon monoxide, which are produced in low temperature combustion because of the low combustion temperature and a deficit of oxygen, was achieved by using various injector configuration. The result of experiment with $100^{\circ}$ injection angle and 8 holes showed that reductions in hydrocarbon and carbon monoxide could be achieved 58% and 27% respectively maintaining the 7% increased indicated mean effective pressure in low temperature diesel combustion compared with conventional injector.

A Study on the Injection Characteristics of Urea Solution to Improve deNOx Performance of Urea-SCR Catalyst in a Heavy Duty Diesel Engine (대형 디젤 엔진용 요소분사 SCR촉매의 deNOx 성능향상을 위한 요소수용액의 분사특성 연구)

  • Jeong, Soo-Jin;Lee, Chun-Hwan
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.16 no.4
    • /
    • pp.165-172
    • /
    • 2008
  • Urea-SCR, the selective catalytic reduction using urea as reducing agent, has been investigated for about 10 years in detail and today is a well established technique for deNOx of stationary diesel engines. In the case of the SCR-catalyst a non-uniform velocity and $NH_3$ profile will cause an inhomogeneous conversion of the reducing agent $NH_3$, resulting in a local breakthrough of $NH_3$ or increasing NOx emissions. Therefore, this work investigates the effect of flow and $NH_3$ non-uniformities on the deNOx performance and $NH_3$ slip in a Urea-SCR exhaust system. From the results of this study, it is found that flow and $NH_3$ distribution within SCR monolith is strongly related with deNOx performance of SCR catalyst. It is also found that multi-hole injector shows better $NH_3$ uniformity at the face of SCR monolith face than one hole injector.

An Optimization of the Combustion Parameters for Reducing Exhaust Emissions in a Direct Injection Diesel Engine (직접분사식 디젤기관 배기배출물 저감을 위한 연소인자의 최적화)

  • 주봉철;노병준;김규철;이삼구
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.8 no.5
    • /
    • pp.78-85
    • /
    • 2000
  • This study is to develop the diesel engine which has 6 cylinder natural aspiration direct injection type of 7.4$\ell$ with high performance, low emissions and low fuel consumption Finally the developed engine meets Korean `98 exhaust emission regulation for the city bus of heavy duty diesel engine by optimizing the various combustion parameters affecting performance and exhaust emissions. Combustion parameters are the swirl ratio of intake ports, the profile of injection pump`s cam affecting injection pressure, the design features of piston bowl of injection pump`s cam affecting injection pressure, the design features of piston bowl of combustion chamber and injector`s hole size. Through experimental analysis, various combustion parameters are optimized and the results are as follows; the swirl ratio is 2.20, the profile of injection pump`s cam is concave and re-entrant ratio, inner diameter of piston bowl and hole diameter of injector is 0.88,$\psi$64.0mm and $\psi$0.25mm respectively.

  • PDF