船舶燃气轮机进气系统中过滤装置数值模型化处理方法研究

Investigation on Numerical Modeling Treatment Method of Filtration Device in Marine Gas Turbine Intake System

关键词:  船舶燃气轮机  进气系统  多孔介质  总压损失  过滤装置  边界

Key words:  Marine gas turbine  Intake system  Porous media  Total pressure loss  Filtration device  Boundary condition

摘要:

为了研究船舶燃气轮机进气系统中，过滤装置数值模型化处理方法的模拟精度及其适用性，针对一种双通道船舶燃气轮机进气系统，分别采用Fan边界和多孔介质模型方法对过滤装置（百叶窗、滤清器）的复杂结构进行处理，开展进气系统内流场特性的详细数值计算研究。结果表明：进气系统大部分总压损失源于燃烧空气滤清器产生的总压损失和竖井中的流动损失；与Fan边界相比，多孔介质模型方法能够获得更贴合实际的进气系统流场，对系统总压损失的预测更具可靠性；两种方法计算出的进气系统流动损失相差不超过10%；使用Fan边界需保证过滤装置不产生明显的整流作用，且压力损失实验数据完备，而选用多孔介质模型需要已知过滤装置阻力系数、孔隙率等物理参数。

Abstract:

In order to study the simulation accuracy and applicability of the numerical modeling method for filtration device in marine gas turbine intake system， for a marine gas turbine double-channel intake system， the Fan boundary condition and porous media model are used to model the complex structure of filtration device （shutter and filter）， and the detailed numerical calculation of the flow field characteristics in the intake system is carried out. Research shows that most of total pressure loss of the intake system results from the total pressure loss in primary air filter and the flow loss in the shaft.Compared with Fan boundary condition， the porous media model can obtain more practical flow field inside the intake system and more reliable prediction of total pressure loss. The difference in the flow loss of the intake system calculated by the two methods does not exceed 10%. When using Fan boundary condition， it is necessary to ensure that the filtration device does not play an obvious role in rectifying， and the experimental data of pressure loss is complete， while porous media model can be selected under the given physical parameters of filtration device， such as resistance coefficient and porosity.