可変ピッチプロペラまわりの流場に関する実験的研究(第1報) : タフト法および油膜法による翼面上の流線観察

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Hydrodynamical characteristics of propeller at design condition are analized by propeller lifting surface theory with accuracy. To extend lifting surface theory to the analysis of controllable pitch propeller (CPP) performances at off-design condition, there are two major problems. l) Is boundary layer assumption for flow on CPP blade at off-design condition formed? Otherwise, it is impossible to apply lifting surface theory to the analysis because it is essentially potential theory. 2) Can mathematical model of free vortex at off-design condition be drawn? Investigation of first problem is described in this report. Four bladed CPP model with 257mm diameter was used for experiments. Flow on blade at design and off-design condition was visualized by depth tuft method and oil film method. No stall nor turbulent separation phenomenon was observed and it is concluded that boundary layer assumption is formed even at off-design condition of CPP. Therefore, hydrodynamical characteristics at off-design condition can be analized by extended lifting surface theory. If boundary layer assumption is formed, calculated pressure distribution can be examined indirectly by comparison of calculated and observed boundary layer characteristics. As a base of examination at off-design condition, boundary layer characteristics at design condition are calculated. They show good correspondence with the results by oil film method. Investigation of second problem will be reported in sequent report.
社団法人日本船舶海洋工学会の論文
1982-09-30

可変ピッチプロペラまわりの流場に関する実験的研究(第1報) : タフト法および油膜法による翼面上の流線観察

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