Egzoz Susturucusu Malzeme Değişikliğinin Isıl ve Akustik Etkisinin Sayısal Olarak İncelenmesi

Öz

Egzoz susturucuları otomobillerde içten yanmalı motorlardan kaynaklanan egzoz gazlarından kaynaklanan gürültüyü önlemek amacıyla kullanılmaktadır. Otomotiv sektörünün gelişmesiyle birlikte egzoz susturucuları gürültüyü azaltmak ve sürüş konforunu artırmak için zamanla daha karmaşık hale geldi. Bu çalışma kapsamında farklı geometrilere sahip egzoz susturucu geometrileri tasarlanmış ve harmonik akustik analizleri yapılmıştır. Analizde hava akış hızı 30 m/s olarak kabul edilmiştir. 1Pa basınç girişi ile yapılan analizler sonucunda elde edilen akustik basınç ve iletim kaybı verileri değerlendirilmiştir. Yapılan değerlendirmeler sonucunda karmaşık bir yapıda modellenen susturucunun akustik olarak daha iyi olduğu sonucuna varılmıştır. Egzoz susturucularının asıl görevi egzoz gazlarının çıkışındaki ses seviyesini azaltmak olsa da egzoz sistemindeki havanın sıcaklığını düşürmesi ve ısıl iletkenliğinin iyi olması da sistemin ısıl güvenliğini tehlikeye atmaması açısından önemlidir. sistem. Bu nedenle CFD termal akış analizi, akustik verimi yüksek, karmaşık bir tasarım kullanılarak 4 farklı malzeme ile gerçekleştirilmiştir. Malzeme olarak gri dökme demir, paslanmaz çelik, 1020 çelik ve alüminyum kullanılmıştır. Çalışmanın bu bölümünde alüminyum malzeme kullanımının ısıl verim açısından daha iyi olduğu tespit edilmiştir.

Anahtar Kelimeler

• Egzoz susturucusu
• Harmonik akustik analiz
• Termal akış analizi
• Hesaplamalı akışkanlar dinamiği

Numerical investigation of the thermal and acoustic effect of material variations on the exhaust muffler

Öz

Exhaust mufflers are used in automobiles to prevent the noise arising from exhaust gases resulting from internal combustion engines. With the advancement of the automotive industry, exhaust mufflers have become more complex over time to reduce noise and increase driving comfort. Within the scope of this study, exhaust muffler geometries with different geometries have been designed, and harmonic acoustic analyses have been carried out. In the analysis, the airflow speed has been accepted as 30 m/s. Acoustic pressure and transmission loss data obtained because of analyses performed with 1Pa pressure input have been evaluated. As a result of the evaluations, it has been concluded that the muffler modeled in a complex structure has been better acoustically. Although the main task of exhaust muffler is to reduce the sound level at the exit of exhaust gases, it is also important to reduce the temperature of the air in the exhaust system and have good thermal conductivity so as not to jeopardize the thermal safety of the system. For this reason, CFD thermal flow analysis has been carried out with 4 different materials using a complex design with high acoustic efficiency. Gray cast iron, stainless steel, 1020 steel, and aluminum have been used as materials. In this part of the study, it has been determined that the use of aluminum material has been better in terms of thermal efficiency.

Anahtar Kelimeler

• Exhaust silencer
• Harmonic acoustic analysis
• Thermal flow analysis
• Computational fluid dynamics

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