EFFECT OF THERMAL INERTIA ON DIESEL ENGINES TRANSIENT PERFORMANCE

D. Minchev, O. A. Gogorenko
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引用次数: 2

Abstract

Transient operation of turbocharged diesel engines is affected by the thermal inertia of the cylinder parts, intake and exhaust manifolds. Because of thermal inertia the temperature of engine parts at steady operation fluctuates during the operating cycle near their average values in a relatively small range, but during transient operation it takes some time to warm or cool the engine parts. Thermal inertia is expressed in changes in fuel combustion, in-cylinder heat transfer and indicated efficiency of the cycle, and increase of general inertia of gas-turbine supercharging system, which determines the necessity to take into account this phenomenon when modeling unsteady engine operation. The conductance-capacitance model was proposed for online internal combustion engines operating cycle simulation tool Blitz-PRO to consider thermal inertia during engine’s transient process. The idea is to consider the heat capacity of engine parts during the heat transfer process, so they accumulate energy at warming and release it at cooling. Com-bined with equations of heat transfer and thermal conductivity it enables to calculate the change in the average temperatures during engine transient and consider the changes in the overall heat transfer process. The proposed method was tested by comparing the experimental data, obtained from the dyno test-bench based on modified KamAZ-740.10 diesel engine, and the results of modeling in Blitz-PRO. During the experiment, the instantaneous brake torque of the engine, crankshaft and turbocharger speed, supercharged air pressure and the pressure at the turbine’s inlet as well as the intake air mass flow were automatically measured during engine running. Calculations were executed for two setups: with the thermal inertia consideration and without it. As a result, it was found that the most influenced by thermal inertia is the supercharging system: by the 8th second of transient process the calculated supercharged air pressure without thermal inertia consideration is 19% greater, comparing to experimental data. The turbocharger’s rotor speed, intake air flow are influenced greatly too. Suggested method of thermal inertia assessment helps to provide much more accurate simulation of engine transient operation, especially in terms of turbocharging system behavior as it is shown.
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热惯性对柴油机瞬态性能的影响
涡轮增压柴油机的瞬态运行受到气缸部件、进气和排气歧管的热惯性的影响。由于热惯性的存在,发动机部件在稳定运行时的温度在一个相对较小的范围内波动在其平均值附近,但在瞬态运行时,发动机部件的加热或冷却需要一段时间。热惯量表现为燃料燃烧、缸内换热和循环指示效率的变化以及燃气轮机增压系统总惯量的增加,这决定了在对发动机非定常运行建模时必须考虑这一现象。针对内燃机运行周期在线仿真工具Blitz-PRO,提出了考虑发动机瞬态过程热惯性的电导-电容模型。这个想法是考虑在传热过程中发动机部件的热容量,所以它们在加热时积累能量,在冷却时释放能量。结合传热方程和导热方程,可以计算发动机瞬态期间平均温度的变化,并考虑整个传热过程的变化。通过对基于改进型kamz -740.10柴油机的动态试验台的实验数据和在Blitz-PRO中建模的结果进行对比,对所提方法进行了验证。实验过程中,自动测量发动机在运行过程中的瞬时制动扭矩、曲轴转速、增压器转速、增压气压、涡轮进气压力以及进气质量流量。计算执行了两种设置:考虑热惯性和不考虑热惯性。结果发现,受热惯性影响最大的是增压系统,到瞬态过程的第8秒,计算出的不考虑热惯性的增压气压比实验数据高19%。涡轮增压器的转子转速、进气流量也受到较大的影响。所建议的热惯性评估方法有助于提供更准确的发动机瞬态运行模拟,特别是在涡轮增压系统方面,如图所示。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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3050
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