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为了研究针栓式喷注器无旋锥形液膜表面波不稳定特性,采用高速摄影获得了不同压降下表面波波动图像,测量了液膜表面波破碎点波长、振幅以及破碎长度等特征信息。利用试验结果修正了无旋锥形液膜色散方程中的参数C和ln(η_bη_0),并求解了色散方程。研究了喷注压降对液膜破碎长度、破碎时间以及破碎点波长的影响。结果表明:随着喷注压降的增加,液膜破碎长度和破碎时间均降低,并且降低趋势越来越缓,液膜表面波发展的非线性增强,理论值与试验值的偏差由3.9%增大到29.2%;液膜破碎位置处扰动波长随喷注压降的增加而降低,并且试验值比理论值偏大50%左右,无旋锥形液膜破碎模型可定性分析针栓式喷注器液膜表面波不稳定性。
In order to study the instability characteristics of the surface wave of the non-conical liquid film in the needle-bolt type injector, the image of surface wave fluctuation under different pressure drop was obtained by high-speed photography. The characteristics of the wavelength, amplitude and breaking length of the broken point information. Using the experimental results, the parameters C and ln (η_bη_0) in the dispersion equation of a non-rotating conical liquid membrane were corrected and the dispersion equation was solved. The effects of jet pressure drop on the length, breaking time and breaking point wavelength of liquid film were studied. The results show that with the increase of jet pressure drop, the length and breaking time of the liquid film decrease, and the decreasing trend is more and more slow. The non-linearity of the liquid film surface wave enhances. The deviation between the theoretical value and the experimental value decreases from 3.9% To 29.2%. The perturbation wavelength at the position of liquid film fracture decreases with the increase of jet pressure drop, and the experimental value is about 50% larger than the theoretical value. Filler liquid film surface wave instability.