在专门设计和建造的40种不同配置的复合排气罩试验设施中进行试验的报告，该排气罩使用槽进行空气分配。在每个发动机罩的三个流速下收集空气分配和发动机罩损失的数据。对于三种发动机罩配置，还收集了发动机罩前面耗尽空间的详细速度分布数据。数据表明，发动机罩损失系数随发动机罩结构显著变化，但对槽速度的变化不敏感。与90度起飞罩相比，直起飞罩的损失系数更低，空气分布更好。发现发动机罩表面边缘的突出挡板会提高发动机罩前面的空气流速。 对于一些简单的排气罩配置，使用标准方法计算的理论排气罩损失系数被发现是准确的，但对于其他配置，其误差显著。关键词:测试、空气流量、压降、空气分布、排气罩。引文:研讨会，ASHRAE交易，第96卷，pt。1990年3月2日，圣路易斯

Reports on the testing in a purpose-designed and built test facility of 40 different configurations of compound exhaust hood that use slots for air distribution. Data on air distribution and hood losses were collected at three flow rates for each hood. Detailed velocity profile data for the exhausted space in front of the hoods were also collected for three of the hood configurations. States the data showed that the hood loss coefficient varied significantly with hood configuration but was insensitive to changes in slot velocity. Straight take-off hoods tended to have lower loss coefficients and better air distribution than 90deg take-off hoods. Projecting baffles at the edges of the hood face were found to raise air velocities in front of the hood. Theoretical hood loss coefficients calculated using standard methods were found to be accurate for some simple exhaust hood configurations but significantly in error for others.KEYWORDS: Testing, air flow, pressure drop, air distribution, exhaust hoods.