泵喷宽带非定常激振力预报与参数分析

为预报泵喷推进器转子与湍流互作用宽频非定常激振力,在Sears函数的基础上,考虑随机湍流波的影响,推导了螺旋桨宽频非定常激振力预报公式,并与实验值对比验证了该公式。进一步考虑泵喷推进器转子工作在前导叶尾流场的情况,通过Gauss尾流模型建立叶片尾流湍流波数谱,通过经验公式计算叶片尾流场参数。推导得到泵喷推进器转子宽频非定常激振力预报公式,通过公式计算得到的宽频非定常激振力与数值计算结果相近。分析了流场参数的变化对推进器转子宽频辐射噪声预报结果的影响。研究得到,湍流强度只影响宽频非定常激振力预报结果的幅值,湍流积分尺度对幅值和频谱形状都有较大的影响。

Prediction and parameter analysis of unsteady broadband thrust for pump jet

To predict the unsteady thrust of the interaction between pump jet rotor and turbulence, on the basis of the Sears function, and considering the influence of the turbulence, the prediction formula of propeller broadband unsteady excitation thrust was derived, which was verified by comparison with experimental values. Furthermore, considering the situation that the rotor of the pump-jet propeller works in the wake field of the leading vane, the turbulence wavenumber spectrum of the blade wake was established through the Gauss wake model, and the parameters of the blade wake field were calculated by empirical formulas. The prediction formula of the unsteady broadband force of the pump jet propeller rotor was derived. The broadband unsteady excitation thrust calculated by the formula was similar to the numerical calculation result. The influence of changes in flow field parameters on the prediction results of the propeller rotor broadband radiation noise was analyzed. Research shows that the turbulence intensity only affects the amplitude of the broadband unsteady excitation thrust prediction results, and the turbulence integral scale has a greater impact on the amplitude and spectrum shape.