液氧/甲烷发动机推力室肋强化换热技术数值研究

为了提高液氧/甲烷发动机再生冷却通道中冷却剂的吸热效率,同时提高该区域的热防护能力,对带有4种不同肋结构的推力室进行了三维稳态耦合传热计算。分析结果表明,在推力室燃气侧壁面设置纵向肋之后,通过引入等效平均热流密度能够描述带肋发动机推力室壁面的实际换热特征。设置人工粗糙度能够使壁面温度降低85.4 K,但会使压降增大0.11 MPa。设置纵向肋则使冷却剂温升提高24.2 K,但同时壁面温度升高276.4 K。此外,虽然人工粗糙度能促进流体之间的传热进而使冷却剂温度分层有所削弱,但由于壁面温度较低导致靠近通道底部处的流体温度明显较低,因此冷却剂温升并没有明显提高。

Numerical study on enhanced heat transfer technology of LOX/CH4engine chamber with ribs

In order to improve the heat absorption efficiency of coolant in the regenerative cooling channel of LOX/methane engines,and improve the thermal protection ability of the region,three-dimensional steady-state heat transfer coupling simulation of chamber with four different rib arrangements were carried out in this paper.By comparing the results,it can be seen that after adding longitudinal ribs on the gas side wall of the thrust chamber,the actual heat transfer characteristics of the thrust chamber wall can be accurately described by introducing the equivalent average heat flux.Adding artificial roughness reduced the wall temperature by 85.4 K and increased the pressure drop by 0.11 MPa.Adding longitudinal ribs increased the coolant temperature by 24.2 K,but the wall temperature increased by 276.4 K.In addition,although the addition of artificial roughness can promote the heat transfer between the fluids and weaken the temperature stratification of the coolant,the temperature rise of the coolant is not significantly increased because the temperature of the fluid near the bottom of the channel is significantly lower due to the lower wall temperature.