高空通风活门内流场特性数值模拟和试验验证

为准确掌握大通风量条件下高空通风活门工作特性，以高空通风活门为研究对象开展流场特性数值仿真分析技术研 究，对不同膜盒间隙的高空通风活门内部流场进行对比分析，获得了不同入口质量流量条件下高空通风活门的压降特性曲线。结 合滑油系统附件试验器改造，利用小量程与大量程体积流量计组合形式实现纯空气体积流量的测量，开展了高空通风活门压降试 验，并将试验结果与数值仿真分析结果进行对比验证。结果表明：仿真分析结果与试验结果吻合较好，流场特性仿真分析方法可 用于高空通风活门压降特性预测，现有高空通风活门在不同膜盒间隙下内流场特性相似，其压降主要集中于膜盒间隙处，改善膜 盒间隙处结构，可有效降低压降。

Numerical Simulation and Experimental Verification of Flow Field Characteristics in High-altitude Ventilation Valve

In order to accurately grasp the characteristics of high-altitude ventilation valves under high-flow ventilation conditions, the numerical simulations and analyses were conducted on the flow field characteristics of a high-altitude ventilation valve. Comparative analyses were conducted on the internal flow fields of the ventilation valve with different bellow clearances, and the pressure drop characteristic curves of the valve under different inlet mass flow conditions were obtained. Leveraging the opportunity of renovating the lubricating oil system accessory tester, a combination of small-range and large-range volume flowmeters was used to measure pure air volume flow. The pressure drop tests of the valve were conducted, and numerical results were compared and verified with test results. The results show that the numerical results are in good agreement with the test results, the simulation analysis method can be used to predict the pressure drop characteristics of high-altitude ventilation valves. The valve has similar internal flow field characteristics under different bel? low clearances, the pressure drop mainly occurred near the bellow clearance area, and the structural improvement near the bellow clear? ance can effectively reduce the pressure drop.