泵浦式消防车使用的气流式喷射泵排气抽真空作用过程是:发动机排出的燃烧废气以一定的流速和压力通过喷嘴,变为高速(亚声速)气流,将负压室的空气(主要来自消防水泵及其进、出水管路系统)曳附形成混合气流进入扩散器,经过再次加速(最高流速可达声速M=1)之后,嘴出到大气中。由于 Pump-type fire pump jet pump exhaust exhaust process is the role of vacuum exhaust: the exhaust gas from the engine at a certain flow rate and pressure through the nozzle into a high-speed (subsonic) airflow, the negative pressure chamber air (mainly From the fire pump and its inlet and outlet piping system) drag to form a mixed gas flow into the diffuser, after re-accelerated (up to the maximum velocity of sound velocity M = 1), the mouth out to the atmosphere. due to