The effect of thermodynamic and geometric parameters on the performance of a Turbocharged Diesel Engine

Öz

The increasing complexity of modern engines has rendered the prototyping phase long and expensive. This is where engine modeling becomes in the recent years extremely useful and can be used as an indispensable tool when developing new engine concepts. The thermodynamic performance of a Turbocharged diesel engine with heat transfer and friction term losses is analyzed. This study deals with the numerical simulation and performance prediction of a turbocharged diesel engine with six-cylinder direct injection. To predict the engine performances, we developed a computer program for simulating the operation of a turbocharged diesel engine, and used the commercial GT-Power software to validate the simulation results. The range of variation of the rotational speed of the diesel engine chosen extends from 800 rpm to 2100 rpm. In this paper we studied the influence of several engine parameters on the brake power and effective efficiency. Moreover it puts in evidence the existence of two optimal points in the engine, one relative to maximum power and another to maximum efficiency; it was found that if the injection time is advanced, so the maximum levels of pressure and temperature in the cylinder are high.

Anahtar Kelimeler

• Single-zone model, ignition compression engine, heat transfer, friction, turbocharged diesel engine, GT-Power, performance optimization.

Bir Turbo Dizel motorun performansı üzerinde termodinamik ve geometrik parametrelerin etkisi

Öz

Modern motorlarda artan karmaşıklık prototipleme aşaması uzun ve pahalı hale gelmiştir. Motor modelleme, son yıllarda son derece yararlı olur ve yeni motor konseptleri geliştirirken vazgeçilmez bir araç olarak kullanılabilir budur. Isı transferi ve sürtünme dönem kayıpları ile Turbo dizel motorun termodinamik performans analiz edilir. Bu çalışma altı silindirli direkt enjeksiyonlu turbo dizel motorun sayısal simülasyon ve performans tahmini ile ilgilenir. Motor performanslarını tahmin etmek, bir turbo dizel motorunun çalışmasını simüle etmek için bir bilgisayar programı geliştirdi ve simülasyon sonuçlarını doğrulamak için ticari GT-Güç yazılımını kullanmıştır. Seçilen dizel motorun dönme hızının değişme çeşitleri 800 rpm 2100 rpm kadar uzanır. Bu yazıda fren gücü ve etkin verim birkaç motor parametrelerinin etkisi araştırıldı. Üstelik bu kanıt motorda iki optimum nokta, tek maksimum güç akrabası ve maksimum verimlilik için başka varlığını koyar; Bu enfeksiyon süresi, gelişmiş, yani, eğer silindir içindeki basınç ve sıcaklığın en yüksek seviyeler yüksek olduğu bulunmuştur.

Anahtar Kelimeler

• Tek bölgeli modeli,ateşleme sıkıştırma motoru,ısı transferi,sürtünme,turboşarjlı dizel motor,GT-Güç,performans

Kaynakça

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