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Measurement of annular liquid film thickness in an open-end swirl injector

机译：开放式旋流喷油器中环形液体膜厚度的测量

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An electrical conductance method was used to measure the liquid film thickness formed in an open-end swirl injector which is commonly used in Russian liquid-oxygen (LOX)/kerosene engines such as RD-120, RD-170, and RD-180. Two porous titanium electrodes and signal processing circuit based on lock-in amplifier were designed to measure the rapid variation liquid film thickness. The experimental results show that the liquid film thickness in the injector decreases with the increase of the pressure drop. The results of these measurements were compared with theoretical equations for predicting liquid film thickness in a swirl injector. An empirical equation to predict liquid film thickness in open-end swirl injector was modified based on the experimental results. Agreement between the modified equation and experimental results is demonstrated in this paper. This measurement method was also used to measure the liquid film thickness under pulsating conditions, and the study shows that our proposed method can be used to measure the liquid film thickness not only in the steady condition but also in the pulsating condition.
机译：使用电导法测量在开放式涡旋式喷射器中形成的液膜厚度，该涡旋式喷射器通常用于俄罗斯的液氧（LOX）/煤油发动机，例如RD-120，RD-170和RD-180。设计了两个多孔钛电极和基于锁定放大器的信号处理电路，以测量液膜厚度的快速变化。实验结果表明，喷射器中的液膜厚度随着压降的增加而减小。将这些测量的结果与用于预测旋流喷射器中的液膜厚度的理论方程式进行比较。在实验结果的基础上，修改了预测开放式旋流喷油器中液膜厚度的经验公式。证明了修正方程与实验结果之间的一致性。该测量方法还用于在脉动条件下测量液膜厚度，研究表明，我们提出的方法不仅可以用于稳定条件下的液膜厚度测量，还可以用于脉动条件下的液膜厚度测量。

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