_202409 用于测量发动机冷却风扇性能的测试方法

[中文适用范围]： 本SAE推荐实践用于测试和评估发动机驱动冷却风扇的近似性能。性能包括流量、压力和功率。这些流量和压力信息用于估计发动机冷却性能。功率消耗用于根据SAE J1349估计发动机净功率。该程序还提供了测量近似风扇性能所需设备的一般描述。 程序中的测试条件通常不会与需要冷却和燃油消耗信息的安装条件相匹配。给定风扇的性能取决于安装的几何细节，包括护罩及其间隙。如果需要精确的性能测量，应在测试设置中复制这些细节。在给定空气密度和速度下的性能还取决于体积流量或风扇上的压力上升，因为这两个参数是相互依赖的。这些参数取决于通过散热器核心的压力降和由于车辆运动而产生的冲压压力。因此，应认识到测试程序仅提供安装风扇性能的近似测量。 尽管测试程序基于使用电动机测功机运行风扇，但如果可以使用精确的扭矩计，则实际安装可以用作测试夹具。在这种情况下，适用相同的资格讨论。 有关风扇离合器在减少风扇使用和功率消耗方面的效果（不属于本程序的一部分），请参阅SAE J1342。 电动冷却风扇组件的性能测试涵盖在SAE J2867中。 1.1 目的 本文件提供了一种推荐的测试程序，用于测量和比较风扇在一系列压力和速度下的性能。所得性能数据旨在预测使用这些风扇的发动机的冷却性能和燃油消耗，并比较一个风扇与另一个风扇。 [外文原描述]： This SAE Recommended Practice is intended for use in testing and evaluating the approximate performance of engine-driven cooling fans. This performance would include flow, pressure, and power. This flow and pressure information is used to estimate the engine cooling performance. This power consumption is used to estimate net engine power per SAE J1349. The procedure also provides a general description of equipment necessary to measure the approximate fan performance.The test conditions in the procedure generally will not match those of the installation for which cooling and fuel consumption information is desired. The performance of a given fan depends on the geometric details of the installation, including the shroud and its clearance. These details should be duplicated in the test setup if accurate performance measurement is expected. The performance at a given air density and speed also depends on the volumetric flow rate, or the pressure rise across the fan, since these two parameters are mutually dependent. These parameters depend on the pressure drop across the radiator core and the ram pressure due to vehicle motion. For these reasons, the test procedure should be recognized as providing only an approximate measure of installed fan performance.Although the test procedure is based on running the fan with a motoring dynamometer, the actual installation can be used as a test fixture if an accurate torque meter is available. In this case, the same qualifications discussed apply.For the effect of a fan clutch in reducing fan use and power consumption, which is not a part of this procedure, refer to SAE J1342.Performance testing of electric cooling fan assemblies is covered in SAE J2867.Cross Reference: J1342_201706,J1349,J2867_201902