• Title/Summary/Keyword: Turbocharger System

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Establishment of Multi-Stage Turbocharger Layout for HALE UAV Engine and Its Performance Assessment (고고도 장기체공 무인기 엔진용 다단 터보차저 구성 및 성능해석)

  • Kang, Young Seok;Lim, Byung Jun;Kim, Jong Kuk
    • The KSFM Journal of Fluid Machinery
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    • v.18 no.6
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    • pp.31-36
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    • 2015
  • A multi-stage turbocharger system has been constructed for HALE UAV internal combustion engine. To boost rarefied intake air up to sea level condition, the turbocharger system should consist of 3 stages including heat exchanger located after compressor outlet to drop compressed air temperature. One dimensional system analysis has been conducted by matching required power between compressor and turbine and adequate turbochargers have been searched for from commercially available models targeting for automobiles. By applying commercial automobile turbochargers to the multi-stage turbocharger system, it is expected that considerable amount of research resources will be saved.

Prediction of the Transient Performance of the Passenger Diesel Engine with Turbocharger using HIL (HIL을 이용한 터보과급기 승용 디젤 엔진의 과도 성능 예측)

  • Chung, Jin-Eun;Jin, Young-Wook;Jeong, Dong-Young;Chung, Jae-Woo
    • Transactions of the Korean Society of Automotive Engineers
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    • v.17 no.5
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    • pp.127-132
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    • 2009
  • The transient performance of the passenger diesel engine equipped with the variable geometry turbocharger was simulated using HIL(hardware-in-the-loop) system. The system consists of engine model as software, and the turbocharger test bench as hardware. The engine model is mean value model which is programmed by the Simulink of the Mathworks. The turbocharger test bench is composed of a blower, some sensors, and DAQ boards. A real time simulation is possible since the operating system based on the real time is included. The results show the good response for the transient characteristics. Therefore this HIL system can be used for development of the new turbocharger effectively.

Application of Main Engine Turbocharger Cut-Out System Onboard a Vessel (Main Engine Turbocharger Cut-Out System 실선 적용 사례)

  • Cho, In-Young;Lee, Dong-Yeub;Kim, Young-Keon
    • Special Issue of the Society of Naval Architects of Korea
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    • 2011.09a
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    • pp.36-38
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    • 2011
  • As the increase of the fuel oil price, the demand for saving of the ship running cost is growing. To meet the needs of the shipowners, the method for low load operation has been developed by engine licenser. As one of low load operation, the turbocharger cut-out system can be utilized flexibly both full and part load operation. It can be possible to optimize fuel consumption at both full and part load operation. Tests by engine licenser with 12K98MC engine have proven that the fuel oil consumption can be reduced approximately 5%. In this paper we will study the application of main engine turbocharger cut-out system onboard a vessel. One of four turbochargers with MAN Diesel & Turbo 12K98MC-C and 12K98ME-C engine is cut out with swing gate valve. The fuel oil consumption is measured during sea trial and engine shop test.

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A study on the reduction of the flow-induced noise in turbo-charger diesel engines (터보 차져 디젤 엔진에서의 기류음 감소를 위한 연구)

  • Kang, Woong;Kim, Hyung-Jin;Sung, Hyung-Jin
    • Proceedings of the KSME Conference
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    • 2007.05b
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    • pp.2913-2917
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    • 2007
  • Turbocharger has been widely used in many passenger cars in application with diesel engines because of high power and fuel efficiency. However, flow-induced noise (whoosh or hissing noise) which is generated within the compressor during its operation at marginal surge line can deteriorate noise characteristics. Hissing noise excitation was associated with the generation of turbulence within the turbocharger compressor and radiated through the transmission path in turbocharger system. In this study, a sharp-edged reactive-type muffler was devised and installed in the transmission path to reduce the hissing noise. Acoustic and fluid dynamic characteristics for the muffler were investigated which is related to the unsteadiness of turbulence and pressure in turbocharger system. A transfer matrix method was used to analyze the transmission loss of the muffler. Simple expansion muffler with extended tube of the reactive type is proposed for the reduction of high frequency component noise. Turbulence computation was carried out by a standard ${\kappa}-{\varepsilon}$ model. An optimal design condition of the muffler was obtained by extensive acoustic and fluid dynamic analysis on the engine dynamometer with anechoic chamber. A significant reduction of the hissing noise was achieved at the optimal design of the muffler as compared with the conventional turbocharger system.

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A Study on the Emission Reduction and Performance Improvement in a V8 Type TCI D.I. Diesel Engine (V8형 TCI 디젤기관의 배출가스저감 및 성능개선에 관한 연구)

  • Yoon Jun-Kyu;Lim Jong-Han
    • Journal of Advanced Marine Engineering and Technology
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    • v.29 no.4
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    • pp.443-452
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    • 2005
  • The purpose of this study is experimentally to analyze the effects of intake port swirl, injection system and turbocharger on the engine performance and the emission characteristics in a V8 type turbocharger intercooler D.I. diesel engine of the displacement 16.7L, and to suggest the improvement of engine performance. Generally to enhance engine power, TCI diesel engine is put to practically use turbocharged intercooler in order to increase volume efficiency which is cooled boost air. As results of considering the factors of the intake port of swirl ratio 2.25, compression ratio 17.5. re-entrant $8.5^{\circ}$ combustion bowl, nozzle hole diameter ${\phi}0.33{\ast}3+{\phi}0.35{\ast}2$. nozzle protrusion 3.18mm, injection timing BTDC $12^{\circ}CA$ and turbocharger(compressor 0.6A/R+46Trim. turbine 1.0 A/R+57Trim) is the best in the full load in the engine performance and the exhaust characteristics of NOx concentration. Therefore. their factors are appropriated as intake system, injection and turbocharger system.

Subsynchronous Vibration Behavior of Turbocharger Supported by Semi Floating Ring Bearing (세미 플로팅 링 베어링으로 지지된 터보차저의 Subsynchronous 진동 특성)

  • Lee, Donghyun;Kim, Youngcheol;Kim, Byungok;Ahn, Kookyoung;Lee, Youngduk
    • The KSFM Journal of Fluid Machinery
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    • v.20 no.1
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    • pp.15-20
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    • 2017
  • The small turbocharger for the automotive application is designed to operate up to 200,000 rpm to increase system efficiency. Because of high rotation speed of turbocharger, floating ring bearing are widely adopted due to its low friction loss and high rotordynamic stability. This paper presents a linear and nonlinear analysis model for a turbocharger rotor supported by a semi-floating ring bearing. The rotordynamic model for the turbocharger rotor was constructed based on the finite element method and fluid film forces were calculated based on the infinitely short bearing assumption. In linear analysis, we considered fluid film force as stiffness and damping element and in nonlinear analysis, the fluid film force was calculated by solving the time dependent Reynolds equation. We verified the developed theoretical model by comparing to modal test results of test rotors. The analysis results show that there are two unstable modes, which are conical and cylindrical modes. These unstable modes appear as sub-synchronous vibrations in nonlinear analysis. In nonlinear analysis, frequency jump phenomenon demonstrated when vibration mode is changed from conical mode to cylindrical one. This jump phenomenon was also demonstrated in the test. However, the natural frequency measured in the test differs from those obtained using nonlinear analysis.

Thermal stress analysis of the turbocharger housing using finite element method (유한요소법에 의한 터보차져 하우징의 열응력 해석)

  • Choi, B.L.;Bang, I.W.
    • Journal of Power System Engineering
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    • v.15 no.6
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    • pp.5-10
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    • 2011
  • A turbocharger is subjected to rapid temperature changes during thermal cyclic loads. In order to predict the thermo-mechanical failures, it's very important to estimate temperature distributions under the thermal shock test. This paper suggest the finite element techniques with the temperature histories, a constitutive material model and the mechanical constraints to calculate the thermal stresses and plastic strain distributions for the turbine housing. The first step was to develop a simple coupon approach to represent the failure mechanism of the classical design shapes and secondly applied the actual turbocharger to predict and validate the weak locations under the physical engine test.

Study of Failure Examples Involved in Turbocharger System of the Diesel Engine a Vehicle (디젤 엔진 자동차의 터보차저 시스템과 관련된 고장사례 연구)

  • Lee, IL Kwon;Lee, Jeong Ho
    • Journal of the Korean Institute of Gas
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    • v.21 no.2
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    • pp.26-31
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    • 2017
  • The purpose of this paper is to study for turbocharger system in a vehicle of diesel engine. The first example, it certified the fact that a car engine is not to accelerate by clogged the exhaust tube as the turbine was damaged because of turbine wheel broken. The a vehicle with turbocharger must to stop engine operation after maintaining the appropriate idle revolution as it can be the sticking phenomenon if the operator immediately stop the engine being high revolution. The second example, it knew the phenomenon of acceleration faulty that the rod of VGT actuator that operating the turbocharger adhered with the bracket of VGT. The third example, it confirmed the power insufficiency phenomenon when driving by of alternator resistor and fan intercooler fan relay connector mistaken assembly. Therefore, the operator have to scrutinize manage no the failure of turbocharger system.

A Comparative Study on Engine Performance and Exhaust Emission Characteristics of Response Power 150HP & 240HP Turbocharged Marine Diesel Engine (대응출력 150마력 및 240마력 터보차저 선박용 디젤기관의 동력성능 및 배출특성 비교에 관한 연구)

  • Kim, Tae-Hyun;Lee, Chi-Woo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.12 no.1
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    • pp.43-51
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    • 2013
  • This is a thesis about the experiment of comparison characteristic of power and exhaust gas in the same condition between diesel engine that is equipped turbocharger different from response power to increase effectiveness of the engine which is recently used in a lot of industry which requires high power. Resulting of the experiment with natural aspiration diesel engine and turbocharger diesel engine, difference in low speed is not significant, but in high speed, effectiveness of turbocharger diesel engine is much higher than the other one. In other hand, in exhaust gas experiment, turbocharger model exhausts more $NO_X$ and $O_2$, but it doesn't significantly affect the result when it comes with decreasing of $CO_2$ and effectiveness of increased power characteristic. As a result, the turbocharger diesel engine is economically effective comparing with the natural aspiration diesel engine.

A Study on Engine Performance and Exhaust Emission Characteristics of Response Power 150HP Turbocharged Diesel engine (대응출력 150마력 터보차저 디젤기관의 동력성능 및 배출특성에 관한 연구)

  • Kim, Tae-Hyun;Lee, Chi-Woo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.6
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    • pp.100-106
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    • 2012
  • This is a thesis about the experiment of comparison characteristic of power and exhaust gas in the same condition between diesel engine that is equipped turbocharger to increase effectiveness of the engine which is recently used in a lot of industry which requires high power. Resulting of the experiment with natural aspiration diesel engine and turbocharger diesel engine, difference in low speed is not significant, but in high speed, effectiveness of turbocharger diesel engine is much higher than the other one. In other hand, in exhaust gas experiment, turbocharger model exhausts more NOX and $O_2$, but it doesn't significantly affect the result when it comes with decreasing of $CO_2$ and effectiveness of increased power characteristic. As a result, the turbocharger diesel engine is economically effective comparing with the natural aspiration diesel engine.