Fuel-film cooling is necessary to mitigate heat transfer in high-pressure oxygen-rich staged combustion engines. A 4.8 MPa (700 psia) axisymmetric kerosene–${\mathrm{H}}_2{\mathrm{O}}_2$ combustor used fuel-film cooling to deposit carbonaceous material on removable metal samples. Posttest inspection of the samples revealed a two-layer structure, with a tenacious dense lower layer and a soot-like upper layer. Total deposit depth was measured using an optical profilometer and was repeatable between tests at the same conditions. Combustor conditions of fuel-film flow rate, bipropellant run time, fuel composition, chamber liner material, and chamber liner surface roughness were varied to determine their effects on total carbonaceous deposit depth as a function of position and time. Increasing the fuel-film flow rate by 40% resulted in similar deposit depths to lower fuel-film flow rates, but for longer axial lengths. Longer run times resulted in thicker deposits. The use of lower thermal conductivity chamber liners resulted in three to four times more deposits.

为了减轻高压富氧分级内燃机中的热传递，必须进行燃料膜冷却。4.8 MPa（700 psia）轴对称煤油–${\mathrm{H}}_{\mathrm{2个}}{\mathrm{Ø}}_{\mathrm{2个}}$燃烧室使用燃料膜冷却将碳质材料沉积在可移动的金属样品上。样品的后测试检查显示为两层结构，具有坚韧的致密下层和类似烟灰的上层。使用光学轮廓仪测量总沉积深度，并且在相同条件下的测试之间可以重复。改变燃烧器的燃料膜流速，双推进剂运行时间，燃料成分，燃烧室衬里材料和燃烧室衬里表面粗糙度的条件，以确定它们对总含碳沉积深度的影响随位置和时间的变化。将燃料膜流量增加40％会导致相似的沉积深度，从而降低燃料膜流量，但轴向长度更长。运行时间越长，沉积物越厚。