The Effect Of Billet-Barrel Type Throttle On An Intake Flow Of A Throttle Body Unit

Che Hashim, Nurul Afikah (2021) The Effect Of Billet-Barrel Type Throttle On An Intake Flow Of A Throttle Body Unit. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Throttle body unit is a main component of air intake system in vehicle’s engine, which is functioned to control quantity of air entering engine’s combustion chamber. Common throttle body utilize the concept of butterfly valve. This concept however has a notable problem which is the plate and spindle that obstruct the air flow. This problem persist even at full throttle, causes flow restriction, which then leads to reduction of engine performance, induction of pressure drops and high pumping losses at high engine speed. In order to improve the engine performance, the newly billet-barrel throttle is designed to replace the current design of butterfly throttle as this design can eliminate flow restriction, which then reflects a high engine performance and high engine speed. The air flow pattern through billet-barrel throttle at idle throttle, partial throttle and full throttle are studied in order to know whether the newly billet-barrel throttle can improve the current butterfly throttle or not. Two concept design of billet-barrel throttle was designed using SolidWorks drawing software, then one of the best designs was choose through design selection method and imported to Ansys-Fluent to proceed the Computational Fluid Dynamic analysis. At the end of case study, the result of the case study was compared with conventional throttle body, which is butterfly throttle and the best design of throttle body was chosen at the end of research work. Four methods had been used in this research study, which are literature review by reviewing, analyzing and synthesizing information from previous study, designing newly billet-barrel type throttle using SolidWorks software, flow simulation analysis using Ansys-Fluent and lastly, comparison method in order to know whether newly billet-barrel type throttle can improve the current butterfly throttle or not especially at full throttle. Referring to major finding of this research study, billet-barrel throttle shows low performance at idle throttle due to high pumping losses at this throttle opening. At partial throttle, both throttle types have shown almost identical performance. However, at throttle opening beyond than 75°, billet-barrel throttle shows a significant performance enhancement with an increase of 39% in mass flow rate, which then reflects a better engine performance at this throttle opening. According to these findings, newly billet-barrel throttle can improve the current butterfly throttle as its resulting in high engine performance and high engine speed at full throttle.

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