Abstract
The influence of forms of nozzle and diffuser, relative position of nozzle and diffuser, suction vacuum and delivery pressure, on the characteristics of air ejector, was experimentally researched, using compressed air of 1·2∼2·9 ata, the maximum suction vacuum and delivery pressure being 20 mmAq and 120 mmAq respectively. The conclusion is as follws : For low pressure air ejector, the parallel nozzle whose length of parallel part is about twice of its diameter, is suitable and it is desirable for diffuser that its length of parallel part is about 2·5 times of its diameter. The ratio of diameter of parallel part of diffuser to that of nozzle should be about 5. For the relative position of nozzle and diffuser, when the exit edge of nozzle coinsides with the inlet edge of diffuser, the ratio of quantity of suction air to that of used air becomes maximum and its value attains to 2·7 in the best condition.
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