某船用中速相继增压柴油机旁通控制策略优化研究

Bypass Control Strategy Optimization of a Medium-Speed Marine Diesel Engine With Sequential Turbocharging

某船用中速相继增压柴油机由一台增压器工作切换至两台增压器工作后排气总管温度偏高。针对该问题对柴油机进排气旁通策略进行优化研究。首先建立该中速柴油机工作过程仿真模型并校验;然后利用仿真模型对改善排气总管温度偏高问题的控制策略进行优化设计,并对优化后的控制策略进行试验验证。结果表明:优化后的旁通控制策略能够使切换点工况的排气总管温度平均降低35℃左右,各缸排气温度略有上升,燃油消耗率基本保持不变。

A medium-speed marine diesel engine with sequential turbocharging technology met the pro-blem that the temperature of exhaust pipe was a little too high when the engine was switched from one turbocharger mode to two turbochargers mode.To deal with it,optimal design of the inlet and exhaust bypass strategy of this diesel engine was carried out.First,the simulation model was built up to simulate the operation process of the medium diesel engine,and the model was verified.Then,the simulation model was used to optimize the control strategy of improve the condition of high temperature in exhaust manifold.The optimized control strategy was verified by test.The result shows that the optimized bypass control strategy can reduce the temperature of exhaust manifold by about 35℃at switching point,the exhaust temperature of each cylinders increases a little,while the fuel consumption rate keeps the same.