摘要
为了实现艇尾实尺桨空化初始航速和高频噪声谱的工程预报,采用模型桨空化多相流模拟和实桨高频噪声谱半经验公式预报相结合的方法,预报了SUBOFF潜艇标称伴流下的实尺度7叶大侧斜桨的空化初始航速和高频噪声谱曲线以及特定频率1kHz处的谱源级。空化模拟和空化初生的较高预报精度由E779A桨的空化形态、空化面积和初生空化数的预报给予了校验。半经验公式的适用性由USS212型潜艇和Agosta-80潜艇的螺旋桨噪声预报给予了校验,精度适中。计算结果表明:7叶桨在水深16.8 m时空化初始航速为12.8 kn,6 kn航速下1 kHz处谱级为101.7 dB,较相同水深下Agosta-80潜艇临界航速高2.6 kn、谱级低0.3 dB,表明噪声性能更优。较好地建立了艇尾实尺桨空化初始航速和高频噪声谱预报的工程应用方法。
For predicting the cavitation inception speed(CIS) and high frequency noise spectrum of full scale propeller at the rear of submarine,the cavitation multiphase simulation for model propeller united with semi-empirical formulas for high frequency noise spectrum prediction for full scale propeller was used to investigate the CIS,cavitating noise spectrum curves and spectrum source level at the characteristic frequency 1kHz of the 7-bladed highly-skewed propeller behind full-appended SUBOFF submarine's nominal wake.The cavitation simulation and tip vortex inception prediction were verified by the calculated cavity pattern,area,and initial inception point of E779A propeller.The reasonability of the semi-empirical formulations was validated by the predicted noise spectrum of both the USS212 submarine and Agosta-80 submarine's full scale propellers,and the precision is acceptable.The calculated results show that the CIS of the 7-bladed highly-skewed propeller is 12.8 knots under the condition of 16.8m water depth,which is 2.6 knots higher than that of the Agosta-80.The spectrum level at 1kHz frequency under 6 knots speed is 101.7dB,and 0.3dB lower than that of the Agosta-80.The numerical method proposed can be a productive approach to assess the full scale propeller's critical speed and high frequency noise characteristics at the rear of submarine.
出处
《振动与冲击》
EI
CSCD
北大核心
2013年第15期71-76,共6页
Journal of Vibration and Shock
基金
国家自然科学基金资助项目(51009144)
关键词
潜艇
螺旋桨
空化噪声
空化初始航速
空化模型
尺度效应
submarine
propeller
cavitation noise
cavitation inception speed
cavitation model
scale effects
