CAJ | 학술논문

采用VOF方法，通过求解RANS方程数值研究了船底凹槽中的气层运动形态及其影响因素，模拟了气层在凹槽中的发展过程，分析了气流量、断阶高度、来流速度对气层形态的影响规律，分析了气层波长与来流速度之间的函数关系．研究结果表明：向凹槽中喷气可形成长气穴；存在一个气流量的临界值，当气流量小于该值时，仅在凹槽首部形成长度有限的局部气穴；当气流量大于该值时，气穴迅速向尾部延伸，并呈波动特征；凹槽深度对气层波动的波长影响甚微，对气层厚度的影响较大；凹槽深度增加，气层的平均厚度增大；气层的波长随来流速度增加而增大，波长近似为速度平方的63．6％．
채용VOF방법，통과구해RANS방정수치연구료선저요조중적기층운동형태급기영향인소，모의료기층재요조중적발전과정，분석료기류량、단계고도、래류속도대기층형태적영향규률，분석료기층파장여래류속도지간적함수관계．연구결과표명：향요조중분기가형성장기혈；존재일개기류량적림계치，당기류량소우해치시，부재요조수부형성장도유한적국부기혈；당기류량대우해치시，기혈신속향미부연신，병정파동특정；요조심도대기층파동적파장영향심미，대기층후도적영향교대；요조심도증가，기층적평균후도증대；기층적파장수래류속도증가이증대，파장근사위속도평방적63．6％．
The air layer formation and its influencing factor on 2D bottom hollow was revealed numeri‐cally by VOF method and solving RANS equations .The effects of some factors ,such as air flow rate , step height and velocity on air layer shapes were studied ,the formula between wave length and veloci‐ty is obtained .T he numerical results show s that a long air cavity is obtained by injecting air into hol‐low if air flow rate is larger than the critical value ,but a short and small local air cavity is presented if air flow is lower than the value .The large and long air cavity shows itself as wave pattern .The hol‐low height has little effect on wave length ,but has some effect on air layer thickness .The air layer thickness is increase as the increase of velocity .The wave length is up as the speed up ,and the wave length is equal to 0 .636 times of the square of velocity .