气流速度对感烟火灾探测器响应灵敏度的影响

针对地下车库、空调出风口等存在高速气流的特殊场所，利用火灾探测综合模拟实验平台，根据气流是否影响烟颗粒生成过程，分别设计2种实验方案，分析比较了光电型与离子型两种感烟火灾探测器在不同气流条件下的响应灵敏度。实验结果表明，在烟颗粒生成过程不受气流影响的情况下，两种感烟探测器的响应灵敏度均随气流速度增大而下降。在气流影响烟颗粒生成过程的情况下，光电感烟探测器的灵敏度依然随着气流速度的增大而迅速下降；而离子型感烟探测器的灵敏度受气流速度影响较小，在高速气流条件下依然保持较高的灵敏度。综合分析表明，离子感烟探测器

The Influence of Flow Velocity on Response Sensitivity of Smoke Detectors

The objective of the work was to evaluate the performance of photoelectric and ionic smoke detectors at different flow velocities through the Fire Emulator/Detector Evaluator(FE/DE).That was accomplished through a series of experiments at different flow velocity,with the same smoldering cottons put directly at the entrance of the FE/DE and in box,respectively.The experiment results indicate that the sensitivity of the two kinds of smoke detectors decreases sharply while the flow velocity around them increases,with the smoldering cottons in the box.However,for the smoldering cottons at the entrance of FE/DE,the sensitivity of the ionic smoke detector does not fall down as sharply as the photoelectric detector.In this case,ionic detectors show better sensitivity than the photoelectric ones.Accordingly,the ionization smoke detector is more suitable for those locations with high flow velocity.