Application of Box-Behnken Analysis on the Optimisation of Air Intake System for a Naturally Aspirated Engine

Abstract

Fuel price crisis has caused people to demand a car that is having a low fuel consumption without compromising the engine performance. Designing a naturally aspirated engine which can enhance engine performance and fuel efficiency requires optimisation processes on air intake system components. Hence, this study intends to carry out the optimisation process on the air intake system and airbox geometry. The parameters that have high influence on the design of an airbox geometry was determined by using AVL Boost software which simulated the automobile engine. The optimisation of the parameters was done by using Design Expert which adopted the Box-Behnken analysis technique. The result that was obtained from the study are optimised diameter of inlet/snorkel, volume of airbox, diameter of throttle body and length of intake runner are 81.07 mm, 1.04 L, 44.63 mm and 425 mm, respectively. By using these parameters values, the maximum engine performance and minimum fuel consumption are 93.3732 Nm and 21.3695×10-4 kg/s, respectively. This study has fully accomplished its aim to determine the significant parameters that influenced the performance of airbox and optimised the parameters so that a high engine performance and fuel efficiency can be produced. The success of this study can contribute to a better design of an airbox.

Throttling Effect on the Performance and Emissions of a Multi-Cylinder Gasoline Fuelled Spark Ignition Engine

“…For example, a reduction technique of engine output torque is required for all spark ignition (SI) engines to meet their load and speed range [3]. To match this requirement for conventional carburetted SI engines, the airflow is usually restricted by the intake throttle plate, which governs the fuel flow through the carburettor [4], as well as controls the air quantity which enters into the combustion chamber [5]. As a result of throttle restriction, the manifold absolute pressure (MAP) falls below atmospheric pressure through the intake manifold.…”

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“…The basic component of the working medium of any internal combustion engine is air drawn from the atmosphere. The engine's intake system is responsible for supplying ambient air to the engine's cylinders with the right purity [1], in the right quantities and at the right pressure and temperature to ensure proper fuel combustion in the cylinders [2] and minimize wear on engine components [3,4]. In addition, the intake system, has the task of suppressing the noise caused by the flow of the air stream [5] and forcing the wave phenomena of the flowing air causing resonant charging, which increases the filling pressure p N in the cylinders, resulting in an increase in engine power [6].…”

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“…The following table (Table 1) provides typical dust concentrations for a variety of engine operating sites [1]. The task of the inlet system in a motor vehicle's internal combustion engine is to deliver air to the engine cylinders in appropriate amounts and with appropriate parameters, in such a way as to ensure the correct course of the fuel combustion process in the engine cylinders [4][5][6][7]. An important task is to supply air with appropriate quality (cleanliness) to engine cylinders to minimise engine components wear.…”

“…The authors of [6] believe that an increase in engine performance and a reduction in fuel consumption of a naturally aspirated engine can be achieved by optimising the geometry of intake system components -airbox. Important parameters in the design of the airbox geometry are the intake diameter, airbox volume, throttle body diameter and the length of the intake manifold.…”