基于动态特征融合的船舶柴油机进排气系统故障诊断

为满足分离效率高、阻力损失小的设计要求，提出柴油机进气过滤器惯性级的结构优化设计方案。

首先，以某船柴油机进气过滤器惯性级为研究对象，采用沟槽和叶型自然融合的方式建立融合型叶型结构；然后，利用数值仿真方法计算其液滴分离效率和阻力损失特性，并与目前常用的叶型结构方案进行对比；最后，开展进气过滤器惯性级的性能试验，并进行数值仿真结果验证。

仿真和试验结果表明：在充分利用惯性分离液滴的同时，融合型叶型结构尽量保持了气流速度场和压力场的均匀分布和连续分布，兼顾了分离性能和阻力性能要求，该设计方案的综合性能最优；在标准工况下，液滴分离效率接近99.9%，阻力损失约为42 Pa。

该叶型结构设计方案可为兼顾液滴分离效率和阻力损失性能的过滤器惯性级设计提供技术参考。

Fault diagnosis of marine diesel engine intake and exhaust system based on dynamic feature fusion

An optimal design scheme for the inertial stage structure of the diesel engine intake filter is proposed, in order to meet the requirements of high separation efficiency and low resistance loss at the same time.First, taking the inertial stage of a diesel engine intake filter as the research object, a fusion blade structure was established by the natural fusion of groove and blade. Then, numerical simulation was used to calculate the droplet separation efficiency and resistance loss characteristics, and compare them with commonly used blade structure schemes at present. Finally, the inertial stage performance test of the intake filter was carried out, and the numerical simulation results were verified by the test results.The simulation results and test results show that the fusion-type airfoil structure keeps the uniform and continuous distribution of the airflow velocity field and pressure field as much as possible while making full use of inertia to separate droplets, taking into account the requirements of separation performance and resistance performance. The overall performance of the design scheme is optimal. Under standard conditions, the droplet separation efficiency is close to 99.9%, and the resistance loss is about 42 Pa.The design scheme of the blade structure can provide a technical reference for the design of the inertial stage of the filter that takes into consideration the droplet separation efficiency and resistance loss performance.