The effect of bellmouth radius and venturi restrictor length on the power and torque of the BM-9's engine

Fauzun, Cahyo Wibi Yogiswara

Student Formula SAE is an international formula car competition for bachelor student. One of the rules in this competition is at the air intake must have a restrictor located after the throttle body and has 20 mm maximum diameter. The restrictor at the air intake causes power and torque produced by engine decrease under the engine specification. To increase the engine performance, modify the bellmouth radius and modify the venturi restrictor length are some of options. The author analyzed the effect of bellmouth radius and divergent length of venturi restrictor at the air intake on power and torque produced by KTM 450 SX-F engine of Bimasakti UGM’s 9th generation car (BM-9). The author made 9 design variation of bellmouth and restrictor then simulated by Ricardo Wave 2016.1 software to calculate the value of power and torque produced by engine. Also, Ansys Fluent 18.1 software was used to analyze pressure loss in the restrictor from the 3 samples design selected. The result is, greater the bellmouth radius and longer the divergent length of venturi restrictor produced higher value of peak power and peak torque produced by engine, also has the lower value of pressure loss in the restrictor. The best design variation in this research is bellmouth design with 30 mm radius and venturi restrictor design with 95 mm divergent length that produced peak power of 37.94 hp at 9300 rpm and peak torque of 29.38 Nm at 9000 rpm, also produced pressure loss of 4713 Pa in the restrictor.

Corresponding Author : Fauzun, Cahyo Wibi Yogiswara
Email : fauzun71@ugm.ac.id

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