Components downstream of the pump in the cryogenic liquid rocket engine were simplified to a horizontal pipe upstream of an injector. Cryogenic chilldown was investigated experimentally in this pipe by constant flow rate of LO₂. The chilldown processes were discussed and the boiling curves were drawn to identify the boiling transition points, Leidenfrost point (LFP) and critical heat flux point (CHF). By fitting the present sets of data, correlation formats of the previous expressions were selected and revised linearly to give the suggested correlation expressions on T_Leid, q_Leid, T_CHF and q_CHF. Because these parameters could also be well correlated to the corresponding pressure, it could be supposed that the effects of pressure could be well represented by the physical properties of the fluid. The recommended correlations on T_Leid, q_Leid and T_CHF include the physical properties of fluid only. The recommended correlation on q_CHF include both the sensor position (L_se) and the physical properties of fluid. Furthermore, a couple of previous correlations based on cryogenic chilldown were validated, at least partially.

低温液体火箭发动机中泵下游的组件简化为喷射器上游的水平管。通过恒定的LO ₂流量，对该管道进行了低温冷却试验。讨论了冷却过程，并绘制了沸腾曲线，以确定沸腾的转变点，莱顿弗罗斯特点（LFP）和临界热通量点（CHF）。通过拟合当前的数据集，选择先前表达式的相关格式并进行线性修正，以给出关于T _Leid，q _Leid，T _CHF和q _CHF的建议相关表达式。。因为这些参数也可以很好地与相应的压力相关联，所以可以认为压力的影响可以由流体的物理性质很好地表示出来。关于T _Leid，q _Leid和T _CHF的推荐相关性仅包括流体的物理性质。关于q _CHF的推荐相关性包括传感器位置（L _se）和流体的物理特性。此外，至少部分地验证了基于低温冷却的几个先前的相关性。