Wall effects and cavitation number correcting of supercavitating tests in water tunnel
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摘要: 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。Abstract: 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.
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Key words:
- super-cavity /
- water-tunnel experiments /
- wall effects /
- correction rules
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图 2 沿程压降对空泡形态的影响(σ0=0.02)
Figure 2. Influence of longitudinal pressure gradient on cavity shape
图 5 公式(19)与验证试验照片的对比
Figure 5. Comparison between the test cavity shape and formula (19)
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