The curves N8 versus M generated for the Type A ejectors @Fig. 16~a!# were practically linear, while the ones generated for the Type B ejectors @Fig. 16~b!# were slightly parabolic. It was verified that the head ratio N8 ~and consequently the discharge head H3 since H1 and H2 were fixed! was inversely dependent on the flow ratio M ~and consequently on the suction flow Q2 since Q1 was fixed!. Hence, for the same flow ratios, the Type A ejectors
caused smaller head losses than the Type B ejectors. It could be seen for both types of ejectors that the lower the area ratio R, the lower the head ratio N8, but the higher the range of flow ratio M. The curves h8 versus M @Figs. 17~a and b!# presented a parabolic form with small asymmetry. It was verified that as the area ratio R decreased, maximum efficiency h8 increased and then decreased for both types of ejectors. This was due to the fact that the lower the area ratio R ~higher throat diameters Dt since Dn was fixed!, the lower the friction head loss was at the annular area
of the secondary inlet until the point that the efficiency began to decline because the driving jet could not exchange its momentum very effectively with the secondary stream near the throat wall. Therefore, the maximum theoretical efficiency for the Type A ejectors, around 26%, was reached for area ratios R between 0.30 and 0.40 and flow ratios M between 0.50 and 0.70. The maximum theoretical efficiency for the Type B ejectors, around 13%, was
reached with R50.30 and M50.35. The value of R50.20 allowed the equipment to operate at higher range of flow ratio M,
the best operation point for the Type A ejectors being around M 51.00, and for the Type B ejectors, around M50.60.
The curves N8 versus M generated for the Type A ejectors @Fig. 16~a!# were practically linear, while the ones generated for the Type B ejectors @Fig. 16~b!# were slightly parabolic. It was verified that the head ratio N8 ~and consequently the discharge head H3 since H1 and H2 were fixed! was inversely dependent on the flow ratio M ~and consequently on the suction flow Q2 since Q1 was fixed!. Hence, for the same flow ratios, the Type A ejectorscaused smaller head losses than the Type B ejectors. It could be seen for both types of ejectors that the lower the area ratio R, the lower the head ratio N8, but the higher the range of flow ratio M. The curves h8 versus M @Figs. 17~a and b!# presented a parabolic form with small asymmetry. It was verified that as the area ratio R decreased, maximum efficiency h8 increased and then decreased for both types of ejectors. This was due to the fact that the lower the area ratio R ~higher throat diameters Dt since Dn was fixed!, the lower the friction head loss was at the annular areaof the secondary inlet until the point that the efficiency began to decline because the driving jet could not exchange its momentum very effectively with the secondary stream near the throat wall. Therefore, the maximum theoretical efficiency for the Type A ejectors, around 26%, was reached for area ratios R between 0.30 and 0.40 and flow ratios M between 0.50 and 0.70. The maximum theoretical efficiency for the Type B ejectors, around 13%, wasถึง R50.30 และ M50.35 ค่าของ R50.20 อนุญาตให้ใช้อุปกรณ์ที่สามารถทำงานที่สูงกว่าช่วงของอัตราการไหล Mจุดดีที่สุดการดำเนินงาน สำหรับตัวดีดชนิด A อยู่ใกล้ M 51.00 และตัว ดีดชนิด B รอบ M50.60
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