基于参变量扫值的非道路用柴油机增压匹配  

Turbocharger matching for non-road diesel engine based on parametric sweeping

作　　者：王俊[1] 申立中[1] 王贵勇[1] 万明定 

机构地区：[1]昆明理工大学云南省内燃机重点实验室,昆明650500

出　　处：《农业工程学报》2014年第17期63-70,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金项目(51166006);国家自然科学基金项目(51246004);云南省应用基础研究计划资助项目(2011FA011)

摘　　要：为了解决传统增压匹配方法不能保证所选涡轮增压器与柴油机最佳匹配的问题,以及内燃机是高度的非线性系统,难以使用具体的数学公式来表示某一参数与其他参数之间的相互关系,基于一款非道路用柴油机的设计开发需求,提出了利用参变量扫值进行增压匹配的方法,以GT-Power软件为载体建立相应的增压柴油机模型,通过对不同大小的压气机和涡轮进行参变量扫值计算,在满足柴油机设计指标与耐久性约束的条件下,综合选取了与柴油机匹配良好的涡轮增压器。为了折中增压之后表征机械负荷的最高气缸压力与表征热负荷的排气歧管温度,又通过模拟分析确定了合理的增压压力和燃烧始点。台架试验结果表明:选定的涡轮增压器与柴油机匹配良好,各项性能参数与排放指标均达到了设计要求,合理匹配增压压力和燃烧始点可有效平衡最高气缸压力与排气歧管温度之间的矛盾。参变量扫值方法代替了实际增压匹配的复杂调整过程,并为实际的标定工作提供了一定的借鉴指导。A certain number of turbochargers are usually selected according to calculation parameters to conduct the bench test with diesel engine and the best one among the several turbochargers will be chosen with the traditional turbocharger matching method. However, this method can’t guarantee that the selected turbocharger is the best choice. Because the internal combustion engine is a highly nonlinear system, it is difficult to use specific mathematical formula to represent a certain relationship between a parameter and other ones. Parametric sweeping to calculate objective functions to find optima is an optimization. It computes the objective function by directly sweeping the factors and then finds the optima by checking the sweeping results against the constraints. The parameter sweeping method is usually restricted to only one or two deign factors, because it is difficult to plot the parametric data of more than three factors. Meanwhile, the turbocharger matching just has two factors, i.e., compressor and turbine. Therefore, based on the design and development demand of a non-road diesel engine, a turbocharger matching method conducted by parametric sweeping was put forward, the corresponding turbocharged diesel engine model was developed according to the primarily selected turbocharger with GT-Power software as a carrier. In order to choose the best compressor and turbine, parametric sweeping study of normalized compressor mass multiplier and normalized turbine mass multiplier was conducted. The effects of compressors and turbines of different sizes on air-fuel ratio, brake specific fuel consumption, peak cylinder pressure and exhaust manifold temperature were analyzed. The final turbocharger having a good matching with diesel engine was selected under the conditions of the diesel engine design objective and durability constraints. However, the cylinder pressure and temperature will significantly increase when the internal combustion engine is equipped with a turbocharger, and both of the mechanical loading and

关 键 词：柴油机 耐久性 涡轮 非道路 增压匹配 参变量扫值研究 

分 类 号：TK421.8[动力工程及工程热物理—动力机械及工程]