• Title/Summary/Keyword: Impulse Tumble Meter

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A Study on In-Cylinder Flow Motion of Swirl and Tumble in a 2- Valve Type Gasoline Engine (2밸브 가솔린엔진의 실린더내 스월 및 텀블유동연구)

  • Eom, Jong-Ho;Jeong, Dong-Su;Lee, Jin-Uk
    • 연구논문집
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    • s.23
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    • pp.63-71
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    • 1993
  • To improve flow in-cylinder flow in a 2-valve gasoline engine, various geometries of combustion chambers are modified. Air flow rate, swirl and tumble flow are measured and analyzed by swirl impulse meter and LDV in a steady state flow measuring rig. The results of LDV experiment are compared with the data of swirl impulse meter.

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CORRELATION STUDY OF THE MEASURED TUMBLE RATIOS USING THREE DIFFERENT METHODS: STEADY FLOW RIG; 2-DIMENSIONAL PIV; AND 3-DIMENSIONAL PTV WATER FLOW RIG

  • Kim, M.J.;Lee, S.H.;Kim, W.T.
    • International Journal of Automotive Technology
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    • v.7 no.4
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    • pp.441-448
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    • 2006
  • In-cylinder flows such as tumble and swirl play an important role on the engine combustion efficiencies and emission formations. The tumble flow, which is dominant in current high performance gasoline engines, is able to effect fuel consumptions and emissions under a partial load condition in addition to the volumetric efficiency under a wide open throttle condition. Therefore, it is important to optimize the tumble ratio of a gasoline engine for better fuel economy, lower emissions, and maximum volumetric efficiency. First step for optimizing a tumble ratio is to measure a tumble ratio accurately. For a tumble ratio measurement, many different methods have been developed and used such as steady flow rig, PIV, PTV, and LDV. However, it is not well known about the relations among the measured tumble ratios using different methods. The purpose of this research is to correlate the tumble ratios measured using three different methods and find out merits and demerits of each measurement method. In this research the tumble flow was measured, compared, and correlated using three different measurement methods at the same engine: steady flow rig; 2-dimensional PIV; and 3-dimensional PTV water flow rig.

A Study on Analysis of Intake Flow in a 5-valves Gasoline Engine by using a Two Color PIV System (이색 PIV를 이용한 5밸브 가솔린 엔진의 흡입 유동 해석)

  • Woo, Young-Wan;Park, Sang-Chan;Lee, Ki-Hyung;Lee, Chang-Sik
    • Proceedings of the KSME Conference
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    • 2001.06d
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    • pp.933-938
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    • 2001
  • A 5-valve(intake 3-valve) engine has been developed to increase engine performance. These vehicles have a high power caused by the decrease of inertia mass of an intake valve and the increase of intake effective area. In this study, velocity profiles at near intake valves were inspected by using a two-color PIV and laser sheet method with tumble control valve(TCV). In addition, steady flow tests were performed to quantify tumble ratio on flow-fields generated with a TCV. These experimental results show that the tendency of the tunble ratio in intake 3-valve engine is different from the one in intake 2-valve engine. From this results, the intake flow characteristics around intake valves were made clear.

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A Study on the Steady Flow of Intake Port in Single Cylinder Engine Head (단기통 엔진 헤드에서 흡기포트의 정상유동에 관한 연구)

  • Kim, Dae-Yeol;Choi, Soo-Kwang
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.16 no.4
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    • pp.13-21
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    • 2007
  • This paper presents characteristics of steady flow by variation of a combustion chamber and an intake port. Gas flow field inside a combustion chamber is the important factor in improving combustion stability and reduction of emission level. The flow characteristics such as flow coefficient, tumble ratio and swirl ratio are measured by the steady flow rig test with an impulse meter in this study. In the measuring, the valve lifts are varied between 1mm to 10mm. The three combustion chambers and two intake ports were applied to the steady flow apparatus in order to investigate the effect of swirl and tumble on the in-cylinder flow. As a result, tumble ratio were found to be different by variation of the combustion chambers and the intake ports. The data from the present study can be applied to design of a similar engine as basic data.

A Study on the Tumble Flow Test Rig Used to Developing Engine Induction System (엔진 흡기시스템 개발 시 사용하는 텀블유동 시험장치의 고찰)

  • Yun, Jeong-Eui;Kim, Myung-Hwan;Nam, Hyeon-Sik;Min, Sun-Ki;Sim, Dae-Gon;Park, Pyeong-Wan
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.6
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    • pp.184-189
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    • 2006
  • Tumble flow test rig has been used as the useful tool in the developing intake system because major flow pattern induced by intake port of DOHC engine is tumble. Angular momentum of in-cylinder tumble flow can not be directly measured by impulse torque meter in the test rig like that of in-cylinder swirl flow due to rotational axis of the flow. Therefore the adaptor to transform tumble to swirl flow must be adapted in the test rig. In this study, using the commercial CFD code STAR-CD, we studied the effects on measured results due to the variation of the major design variables in the adaptor, tube length(L), tube diameter(D) and cylinder height(H). The effect of the attached angle($\theta$) of the test head to the adaptor also was simulated.

Investigation on the In-Cylinder Flow of 5-Valve Gasoline Engine by Using Two Color PIV Method (이색 PIV 기술을 이용한 5밸브 가솔린엔진 연소실 내의 유동특성 분석)

  • Lee, Gi-Hyeong;U, Yeong-Wan;Park, Sang-Chan;Lee, Chang-Sik
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.26 no.2
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    • pp.238-244
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    • 2002
  • A 5-valve(intake 3-valve) engine has been developed to increase engine performance. These engines have a high power caused by the decrease of inertia mass of an intake valve and the increase of intake effective area. In this study, in-cylinder flow patterns were visualized with laser sheet method and velocity profiles at near intake valves were inspected by using a two-color PIV. In addition, steady flow tests were performed to quantify tumble ratio of flow-fields generated by a tumble control valve(TCV). Experimental results of steady flow test show that the cure of tumble ratio in intake 3-valve engine farmed as a S shape with valve lift changes. This tendency is different from the one in intake 2-valve engine. Using laser sheet method and two color PIV method, we can find that the intake flow through upper valve increases and the velocity gradient also slightly increases as valve lift increases. From this study, the in-cylinder flow characteristics around intake valves were made clearly.

Intake Flow Characteristics with SCV Open Ratio in a 4-Valve Direct Diesel Engine (4밸브 직분식 디젤엔진의 SCV 개구율에 따른 흡입유동특성)

  • 최승환;전충환;장영준;이진욱
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.7
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    • pp.66-75
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    • 1999
  • Many researchers have developed the measurement technique of in-cylinder flow. Recently, there are lots of studies on steady flow with different SCV geometries. In this study the flow characteristics of four-valve cylinder head were examined in a steady test rig for different SCV open ratios. Each swirl ratio of several SCV angle was quantified by swirl impulse meter and 2D-LDV measurement. The results showed that the swirl ratio was controlled between 2.3 and 3.8 based on SCV angles. The velocity distributions of in-cylinder flow field were measured by 2-D LDV test and visualized swirl and tumble flow pattern at different positions. In this engine , we found out that the swirl was dominant flow.

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Optimal Gas-Flow Conditions for Stabilization of Lean-Burn Combustion (희박연소 안정화를 위한 가스유동장 조건에 관한 연구)

  • 이기형;이창식
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.3
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    • pp.763-770
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    • 1995
  • Gas flow characteristics within the cylinder is important factors in impoving lean combustion stability. This paper shows the effects of various flow fields generated by a swirl control valve(SCV) on combustion process in a 4-valve spark ignition engine. An impulse swirl/tumble meter was used to elucidation the steady-state flow characteristics, and a rotating grating type LDV was developed to measure the mean velocity and tunbulence intensity in relation to the crank angle. These methodologies were applied to clarify the correlation between gas flow characteristics and combustion stability at a lean air fuel ratio. An analysis of the correlation revealed the gas flow conditions required to optimize a lean-burn system.

Lean burn Combustion Characteristics of Direct Injection Gasoline Engine with Swirl Control Valve (스월 제어 밸브를 적용한 직접분사식 가솔린 엔진의 희박연소 특성)

  • Lee, Min-Ho;Moon, Hak-Hoon;Cha, Kyung-Ok
    • Journal of ILASS-Korea
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    • v.9 no.2
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    • pp.9-17
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    • 2004
  • The performance characteristics of lean burn system in gasoline engine are mainly affected by the air-fuel mixture in cylinder, gas exchange process of manifold system, exhaust emission of engine, and the electronic engine control system. In order to obtain the effect of performance factors on the optimum conditions of lean burn engine, this study deal with the behavior of mixture formation, gas flow characteristics of air, flow and evaporation analysis of spray droplet in cylinder, vaporization and burning characteristics of lean mixture in the engine, and the control performance of electronic engine control system. The optimum flow conditions were investigated with the swirl and tumble flows in the combustion chamber with swirl control valve. The performance characteristics and optimum condition of flow field in intake system were analyzed by the investigation of inlet flow of air and combustion stabilization on cylinder.

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