TAILIEUCHUNG - Theory Design Air Cushion Craft 2009 Part 3

Tham khảo tài liệu 'theory design air cushion craft 2009 part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 66 Air cushion theory Static air cushion characteristics on a water surface Static hovering performance of SES on water The various shapes of mid-sections of sidewalls are shown in Fig. a typical one is figure a namely sidewalls with perpendicular inner and outer walls near the water surface. The craft total weight is supported by a combination of cushion lift and buoyancy of the sidewall which can be expressed as aA 2 where w is the craft weight N pc the cushion pressure N m2 Sc the cushion area m2 Ko the volumetric displacement provided by each sidewall m3 and 7W the specific weight of water N m3 . According to Archimedes principle the relationship between cushion beam inner and outer drafts and width of sidewalls with different shape can be determined by the following expressions and those in Fig. Sc Bclc to - 6 pc yw where t0 is the outer draft of sidewalls m 6 the inner draft of sidewalls m 4 the cushion length m Bc the cushion beam m and w the calculating width of sidewalls m . The inner sidewall draft gradually reduces as lift power is increased and cushion air will leak from under both sidewalls once the cushion pressure exceeds the inner sidewall draft Fig. as well as under the bow and stern seals and form the plenum type of craft similar to the craft model 33 of HSEI and the US Navy SES-100B. The drag of this type of craft decreases dramatically as lift power is increased. The outer draft of sidewalls t0 is dependent upon the lift fan s flow rate and the inner draft tị is dependent upon the cushion pressure pc. The air leakage from the Fig. Sidewall thickness on various sidewall configurations. static air cushion characteristics on a water surface 67 Fig. Air leakage under sES sidewall with large air flow rate hovering static over water. cushion at the bow also at the stern can be illustrated as in Fig. . The flow rate of an SES hovering statically on a water surface is normally calculated using the .

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