Floating System due to Jet Curtain

1.理论研究：本文研究了两种情况：(1)对柔性薄壁漂浮材料的气动力进行了二维分析；(2)对气垫室内的流场进行了三维分析。在文献(1)中，指出基本浮体系统仅由三种类型的喷幕构成，并在无粘不可压流体流动的假设下对这三种类型进行了分析。利用这些结果，对典型的浮式三系统进行了分析。在实际漂浮系统中，射流喷嘴的跨向宽度较大，且气垫室的两边不会被射流帷幕截断，导致气垫室内的压力在跨向不均匀恒定。在后者(2)中，这种三维流动是在层流假设下进行分析的。实验研究：搭建了二维实验装置，以估算外冷场向内暖气垫室的热量交叉率。测量了保持腔内温度恒定所需的能量。利用实验结果，从一维能量平衡分析中估算了热的交叉率，并利用上述结果估算了喷流幕处于不平衡状态时的总热流。

1. Theoretical study : This study treats two cases ; (1) two-dimensional analysis on the aerodynamic forces on a flexible thin floating material, and (2) three-dimensional analysis focussed mainly on the flow field in a cushion chamber. In the former (1), it is shown that the foundamental floating system is constructed by only three types of the jet curtain and these three types are analyzed under the assumption of an inviscid and incompressible fluid flow. Using these results, typical floating three systems are analyzed. In the actual floating system, the spanwise width of the jet nozzle is fairly large and the both edges of the cushion chamber is not intercepted by the jet curtain, so that the pressure in the cushion chamber is not uniformly constant in spanwise. In the latter (2), this three-dimensional flow is analyzed by the assumption of the laminar flow.2. Experimental study : Two-dimensional experimental equipment was built in order to estimate the crossing rate of heat from the outer cool field to the warm innner cushion chamber. The energy which needs to keep the temperature in the chamber constant is measured. By using the experimental results, the crossing rate of heat is estimated from one-dimensional energy balance analysis, The overall heat flow in the case where the jet curtain is in unbalanced state is also estimated by applying the above results.