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本文给出了冻结流面理论(FSST),用于计算三维表面不平整突体非分离水流中的最小压强系数(C_(Pm))。该理论适用于圆拱的回转体。由圆拱回转体而计算出的 C_(Pm)数值与风洞试验测量所得的数值相比较。在试验状态Ⅰ中,旋转流入的来流是轴对称的,而且它是由锥形体产生的一系列尾流所产生的;在状态Ⅱ中,旋转流入的来流是非轴对称的,它是由在平板上的紊流边界层流而产生。两种情况中,计算所得的 C_(Pm)数值要比试验所得的 C_(Pm)数值大。因此,冻结流面理论给空化初生提供了一个保守的估算值值。
This paper presents the theory of frozen flow surface (FSST), which is used to calculate the minimum pressure coefficient (C Pm) in the non-separated flow with three-dimensional surface irregularities. The theory applies to the circular arch of the body. The C_ (Pm) value calculated from the circular arch rotor is compared with the value obtained from the wind tunnel test. In experimental condition I, the incoming stream of rotation is axisymmetric and it is produced by a series of wakes generated by the cone; in state II, the incoming stream of rotation is non-axisymmetric and consists of Turbulent boundary laminar flow on the plate. In either case, the calculated C_ (Pm) value is greater than the C_ (Pm) value obtained from the test. Therefore, the theory of the frozen flow surface provides a conservative estimate of cavitation.