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Thermodynamic and dynamic modeling of a single cylinder four stroke diesel engine

机译：单缸四冲程柴油机的热力学和动力学模型

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In this study the conjugate thermodynamic and dynamic modeling of a single cylinder four-stroke diesel engine was conducted. The gas pressure in cylinder was calculated with the first law of the thermodynamic and the general state equation of the perfect gases. 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 engine consists of the motion equations of piston, conrod and crankshaft Conrod motion was modeled by 2 transla-tional and 1 angular motion equations. In the derivation of the motion equations, the Newton method was used. Motion equations involve hydrodynamic and asperity frictions as well as gas forces. By preparing a heat release rate profile consistent with ones given in the literature, thermal efficiency, knocking, vibration, torque and emission characteristics of the engine were investigated. The counterweight mass and its radial distance were optimized. At full load, if the heat release period is initiated soon after the piston passed the top dead center, the pressure rise rate becomes critical from the knocking point of view however, a couple of degree of retarding of the heat release period avoids the knocking without causing significant loss in thermal efficiency. If the throttling is more than 70%, the temperature of the combustion gas is high enough for NOx formation. At full load the vibrational torque exerting on the crankshaft was determined as about 17 times the engine torque.
机译：在这项研究中，对单缸四冲程柴油机进行了共轭热力学和动力学建模。利用热力学第一定律和理想气体的一般状态方程计算出气缸中的气压。在热力学循环的加热过程中，赋予工作流体的热量变化用高斯函数建模。发动机的动力学模型由活塞，连杆和曲轴的运动方程组成。连杆运动由2个平移和1个角运动方程建模。在运动方程的推导中，使用了牛顿法。运动方程涉及流体动力摩擦和粗糙摩擦以及气体力。通过准备与文献中给出的一致的放热率曲线，研究了发动机的热效率，爆震，振动，扭矩和排放特性。对重质量及其径向距离进行了优化。在满载情况下，如果在活塞经过上止点后立即开始放热阶段，则从爆震的角度来看，压力上升率变得至关重要，但是，放热时期的几个延迟程度可以避免爆震，而不会导致爆震。造成热效率的重大损失。如果节流超过70％，则燃烧气体的温度足够高以形成NOx。在满载时，施加在曲轴上的振动扭矩确定为发动机扭矩的17倍左右。

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