CAJ | 학술논문

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.
물면구유부압제도시학보운재기재수중혹공기중항행시불분리적필요조건.요구운재기정개물면구유부압제도시불가능적,소이구유교단적정압제도외형경유의의.해문연구저양일충압력분포적축대칭외형,칭지위부압제도축대칭외형.대부압제도축대칭외형진행료분리특성적수치모의병여Nesteruk적시험결과진행비교분석,기우전통핵공화기시이론대부압제도축대칭외형진행공화계산.계산결과증실료세류이론화풍동시험적압력분포,병차재모의적뢰낙수범위내몰유분리현상발생.연이부압제도축대칭외형발생료공화현상,병형성료초공포.
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 results. However, cavitation phenomenon for the shape was observed and a supercavity was formed.