Dynamic and Thermodynamic Examination of a TwoStroke Internal Combustion Engine

In this study the combined dynamic and thermodynamic analysis of a two-stroke internal combustion engine was carried out. The variation of the heat, given to the working fluid during the heating process of the thermodynamic cycle, was modeled with the Gaussian function. The dynamic model of the piston driving mechanism was established by means of nine equations, five of them are motion equations and four of them are kinematic relations. Equations are solved by using a numerical method based on the Taylor series. By means of introducing practical specific values, the dynamic and thermodynamic behaviors of the engine were examined. Variations of several engine performance parameters with engine speed and charging pressure were examined. The brake thermal efficiency, cooling loss, friction loss and exhaust loss of the engine were predicted as about 37%, 28%, 4%, and 31% respectively for 3000 rpm engine speed and 1 bar charging pressure. Speed fluctuation was found to be 3% for 3000 rpm engine speed and 45 Nm torque.

Bu araştırmada iki zamanlı bir içten yanmalı motorun dinamik ve termodinamik birleşik analizi yapılmıştır. Termodinamik çevrimin yanma süresince çalışma akışkanına verilen ısının değişimi Gauss fonksiyonu ile modellenmiştir. Piston hareket mekanizmasının dinamik modeli dokuz denklemle modellenmiş olup bunlardan beşi hareket denklemi, dördü kinematik ilişkidir. Dinamik ve termodinamik modeli oluşturan denklemler Taylor serisine dayanan bir yöntemle çözülmüştür. Gerçekçi spesifik değerler kullanılmak suretiyle motorun dinamik ve termodinamik davranışları incelenmiştir. Muhtelif motor performans parametrelerinin motor hızı ve şarj basıncı ile değişimi incelenmiştir. 3000 rpm motor hızı ve 1 bar dolgu basıncı için termik fren verimi, soğutma kayıpları, sürtünme kayıpları ve egzoz kayıpları sırası ile %37, %28, %4 ve %31 olarak belirlenmiştir. 3000 rpm motor hızı ve 45 Nm tork için hız dalgalanmaları %3 olarak belirlenmiştir.

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