通气空泡水洞试验壁面影响理论分析及空化数修正

以超空泡横截面独立膨胀原理作为理论基础,针对水洞通气超空泡试验中不可避免的壁面影响问题,推导了水洞试验段压力环境下空泡形态的理论计算公式,与已有的无界流空泡形态计算公式比较,得到了试验段沿程压降对空泡形态的影响规律.基于推导的公式,进一步分析了模型阻塞比对空泡形态的影响,给出了试验中实测空化数与原型空化数的理论换算方法...

Wall effects and cavitation number correcting of supercavitating tests in water tunnel

This paper is intended to evaluate the wall effects in the super-cavity flow past a test model held in a closed water tunnel, and to establish a theoretical correction rule. Based on the principle of independence of cavity expansion, mainly considering the longitudinal pressure gradient in the working section, a theoretical solution of the super-cavity shape in the closed water tunnel is derived. With the theoretical solution the wall effects are discussed, and a correction rule of the cavitation number is presented.