摘要
物面具有负压梯度是确保运载器在水中或空气中航行时不分离的必要条件.要求运载器整个物面具有负压梯度是不可能的,所以具有较短的正压梯度外形更有意义.该文研究这样一种压力分布的轴对称外形,称之为负压梯度轴对称外形.对负压梯度轴对称外形进行了分离特性的数值模拟并与Nesteruk的试验结果进行比较分析,基于传统核空化起始理论对负压梯度轴对称外形进行空化计算.计算结果证实了势流理论和风洞试验的压力分布,并且在模拟的雷诺数范围内没有分离现象发生.然而负压梯度轴对称外形发生了空化现象,并形成了超空泡.
A shape with a negative pressure gradient ensures a vehicle flying in the air or water does not Separate. It is impossible for any vehicle to have a negative pressure gradient over the whole surface, so a shape with a relatively short zone of positive pressure gradient is ideal. An axi-symmetrical shape with an ideal negative pressure distribution was studied. Separate characteristics of the shape were simulated and the results were compared with Nesteruk＇s experimental data. Cavitation characterstics for the shape were calculated based on traditional nuclear theory for incipient cavitation. The pressure distribution of potential theory and wind tunnel tests confirmed that the separation phenomenon isn＇t observed in the range of Reynold＇s numbers as the calculation resuhs. However, cavitation phenomenon for the shape was observed and a supercavity was formed.
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2009年第11期1219-1223,共5页
Journal of Harbin Engineering University
基金
国防"十一五"基础科研基金资助项目(A2420061291)
关键词
负压梯度
轴对称外形
分离特性
空化特性
数值模拟
negative pressure gradient
axi-symmetry shape
separate characters
cavitation characters
numerical simulation
