NUMERICAL ANALYSIS OF STRIKE OF PISTON TO CYLINDER UNDER SUPERCHARGE CONDITIONS

Objective To investigate the changes to the strike extent of piston to cylinder after engine supercharge design. Methods The lubrication model between the skirt of piston and liner is established by means of piston dynamics, combined with the hydrodynamic lubrication equation. Optimized numerical analysis method is employed in solving the dynamics and lubrication equations. The analyses about piston strike under two combustion gas pressures are performed. Results The peak values of maximum eccentricity under supercharge condition are much greater than under non-supercharge condition, which means a stronger impulsion of piston to cylinder wall and a greater possibility of scuffing. The horizontal velocities of piston in supercharge condition are larger, which illuminate the more unstable motion state. Conclusion The analysis gives a new conclusion. Combustion gas pressure plays an important role in the piston strike motion. Influences of supercharge should be taken into account so that the traditional product test items can be improved.     

小型柴油机谐振增压的探讨

探讨了小型柴油机谐振增压的机理，并在此基础上提出了一种谐振增压管长度的计算式，此计算式既反映了增压管长度与柴油机结构参数、使用参数之间的关系，又简明实用，本文还介绍了此计算式在285Q型柴油机谐振增压中的运用和性能对比试验。     

主空气冷却器和废气涡轮的清洗

有效清洗船舶空气冷却器和废气涡轮可提高空冷器的冷却效率,促进废气能量的充分利用,进而提高整台柴油机的热效率。     

N54/N55涡轮增压系统检查分析

随着职业教育、校企合作、定单培养模式的逐步深入,同学们在经销商实习和工作中常遇到各种各样的实际案例,而涡轮增压系统故障,如何检查、分析,是同学们讨论最多也是最有争议的,结合实际案例,进行分析整理,希望对大家有所帮助,力求通俗易懂。     

基于MATLAB的增压发动机动态排放仿真模型研究

介绍了研究增压发动机动态排放问题的意义以及研究方法.采用了增压发动机动态性能模拟与稳态试验相结合的方法,建立了涡轮增压柴油机的准线性动态模型,利用稳态试验数据建立神经网络排放模型,提出了一种将2种模型结合起来在MATLAB/SIMULINK环境下的增压发动机动态排放预测仿真模型.