The effect of Intake Manifold Runners Length on the Volumetric Efficiency by 3-D CFD Model

Maftouni, Negin; Ebrahimi, Reza; pour, Siamac Hossein

doi:10.4271/2006-32-0118

Cited by 12 publications

(4 citation statements)

References 4 publications

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“…More accurately, they revealed that an improvement of 9% was obtained in volumetric efficiency when the intake pipes length adopted the quarter-wave method. Applying the resonator technique, Maftouni, et al [26] investigated the intake manifold runner length effect on the volumetric engine efficiency. Their analysis was performed using CFD simulation for different engine operating conditions.…”

Section: Introductionmentioning

confidence: 99%

Effects of intake manifold geometry in H2 & CNG fueled engine combustion

SAAIDIA,

GHRISS,

KÖTEN

et al. 2024

Journal of Thermal Engineering

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This study attempted to identify the effect of optimized intake manifold geometry on the behaviors and emission level of hydrogen compressed natural gas (H2CNG) fueled engine. For this purpose, a commercial Hyundai Sonata spark ignition engine (SIE) is modified to operate with CNG and hydrogen blend. The optimal intake pipe length was predicted using an analytical acoustic method. A new intake manifold is designed and implemented utilizing natural supercharging managed by over-pressure waves acoustic propagation. Several tests are conducted on the engine using the new manifold with a speed range from 1000 to 5000 rpm. Based on various engine speeds, the variation of brake torque (BT), in-cylinder pressure, NOx and CO emissions investigated by using gasoline, CNG and hydrogen CNG blend (HCNG) fueled engines via external mixtures. The first finding of the study is that the novel geometry improves the in-cylinder pressure by 10% at 3500 rpm. However, high engine speeds show a reduction of 14% in NOx and 40% in HC while speeds below 2000 rpm reduce CO by 40%. The second finding is that the new optimized geometry serves to get rid of both the auto-igni-tion and the backfire for high ratio of hydrogen in the blend.

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Section: Introductionmentioning

confidence: 99%

Effects of intake manifold geometry in H2 & CNG fueled engine combustion

SAAIDIA,

GHRISS,

KÖTEN

et al. 2024

Journal of Thermal Engineering

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show abstract

“…An analysis study of the effect of intake manifold runners length on the engine volumetric efficiency was proposed by Maftouni et al. 15 Analyses were performed using CFD simulation at different engine speeds. They observed that using the manifold configuration with 20% extended runners, the engine volumetric efficiency enhances considerably.…”

Section: Introductionmentioning

confidence: 99%

Variable intake manifold geometry influence on volumetric efficiency enhancement at gaseous engine starting speeds

Jemni

Hadjkacem

Ammar

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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This paper studied the effect of variable intake length manifold on filling and volumetric efficiency at starting engine speeds using numerical and experimental process. The investigation is based on acoustic supercharging phenomenon. For this purpose, 1-D engine gas-flow model was developed and optimum intake lengths for several low engine speeds were determined using acoustic theory based-resolution. Using the method of characteristics, pressure waves were predicted at the end of intake line length (intake valve level) in order to test the dynamic inertial supercharging phenomena. The quarter-wave resonator technique was taken into consideration to explore the inlet pressure pulsations. Simulations of pressure wave propagation were achieved during intake stroke and intake valve closed phase. Simulation predictions confirmed the analytically calculated optimum intake length. Numerical investigations were carried out on five in-cylinder flow moving through intake system; air, air-gasoline, air-LPG, air-H2 and air-LPG-H2 blend. The percentages of supplied hydrogen with LPG were 0%, 5%, 10%, 15% and 20% in volume. To experimentally validate the analytical founded lengths, an instrumented cold-flow four cylinder Ford SI engine test bench was prepared. Flow through variable intake length manifold was analyzed. Geometry variation was performed on the plenum length. Three engine low speeds are tested; 500 rpm, 750 rpm and 1000 rpm. The experiment results showed an in-cylinder velocity increase by about 60%, 58% and 48% using the optimal intake length at 500 rpm, 750 rpm and 1000 rpm respectively. Furthermore, the collected data proves that varying intake pipe length continuously with the engine speed leads to an average of 39.7% improvement in volumetric efficiency from the original engine configuration at 1000 rpm.

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“…Obter valores de vazão e compará-los com resultados experimentais. Maftouni et al (2006) FIGURA 59. Efeito do raio de concordância no campo de velocidades: a) r = 0.0m; b) r = 0.005m c) r = 0.01m (SHAW et al, 2000).…”

Section: -Análise Do Fluxo Interno No Coletor De Admissão (Cfd)unclassified

Aspectos a serem considerados no desenvolvimento de um coletor de admissão plástico soldado por vibração

Simões¹

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Intake manifold project is essential to achieve the best internal combustion engine performance, and, therefore, several parameters should be considered during it development. For instance, an uneven air distribution lead to uneven cylinder volumetric efficiency, power loss and increased fuel consumption. On the other hand, pressures variations within intake manifold due to air flow transient effects could substantially increase or decrease the engine performance. Nowadays, in Brazil, the majority of the intake manifolds are fabricated from nylon with glass fiber which provides weight reduction, wall friction reduction and complex internal geometries. However, new factors become important like structural integrity reduction and withstand to burst pressure. This work presents the mainly development stages of a plastic intake manifold vibration welded. First, the basic intake manifold dimensions are defined through one-dimensional simulation. From this, three-dimensional model is built considering the engine compartment space available and aspects which allows injection and welding process of manifold shells. Then, intake manifold internal geometry is optimized to minimize air flow losses, increasing the volumetric efficiency. Intake manifold structural integrity and welding quality should de evaluated to withstand customer requirements. Confirming the intake manifold drawing through tests with prototype parts, production tooling is started.

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The effect of Intake Manifold Runners Length on the Volumetric Efficiency by 3-D CFD Model

Cited by 12 publications

References 4 publications

Effects of intake manifold geometry in H2 & CNG fueled engine combustion

Effects of intake manifold geometry in H2 & CNG fueled engine combustion

Variable intake manifold geometry influence on volumetric efficiency enhancement at gaseous engine starting speeds

Aspectos a serem considerados no desenvolvimento de um coletor de admissão plástico soldado por vibração

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