The Application of Wave Action Techniques to Reciprocating Engines

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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“…This behavior is justified by previous works and especially at engine low speed, the subject of this paper investigation. 39…”

Section: Resultsmentioning

confidence: 99%

“…The in-cylinder dynamic flow behavior, in internal combustion engine, is mathematically depicted 10,25 by the continuity equations, the momentum equation, and the energy equation: …”

Section: Determination Of Optimized Intake Line Lengthsmentioning

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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“…However, the results predicted for the exhaust manifold were not as good as those for the intake manifold. This inaccuracy is suggested by Winterbone [27] to be due to the shortcomings of the homentropic method in application to the hot exhaust gas flow.…”

Section: Steady State Modelsmentioning

confidence: 99%

“…Winterbone [27] also quotes Worth [28], who investigated the ability of non-homentropic MOC to predict a range of manifold configurations. A full set of results was obtained over an engine speed range of 2500-5000 r/min for a total of 12 manifold arrangements.…”

Section: Steady State Modelsmentioning

confidence: 99%

“…Although conservation of the species was achieved, the authors did not mention the ability of the method to track temperature discontinuities. It was mentioned in reference [27] that the finite volume method can cope with entropy changes but it does not preserve the discontinuities to a degree that can be achieved by using the path lines method in the MOC. Although Baruah's work was published about 20 years ago, little work has been published since then on his approach.…”

Section: Composition/species Trackingmentioning

confidence: 99%

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Thermodynamic modelling of complete engine systems—a review

Chow

Wyszyński

1999

Proceedings of the Institution of Mechanical Engineers, Part D:

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This paper gives an overview of engine systems modelling by first and second law analysis. Complex engine systems are becoming more commonly implemented to meet the increasing demands of fuel efficiency and emission legislation. Future engine systems may also include both exhaust gas treatment and fuel processing devices. This leads to complex interactions within the thermodynamics and chemistry of powerplant systems. There is therefore a need to improve the systems modelling methods. This concerns first of all the composition tracking and the models of three-way catalytic exhaust converters and fuel processors. The applicability of gas dynamics modelling to chemically complex systems is also discussed. All these processes need to be modelled as interacting parts of one system.

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The Accuracy of Calculating Wave Action in Engine Intake Manifolds

Winterbone¹,

Yoshitomi²

1990

SAE Technical Paper Series

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The Application of Wave Action Techniques to Reciprocating Engines

Cited by 4 publications

References 30 publications

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

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

Thermodynamic modelling of complete engine systems—a review

The Accuracy of Calculating Wave Action in Engine Intake Manifolds

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