一次调节通道流阻特性的数值模拟

Numerical simulation on the flow characteristics of the primary metering groove

关键词:  推力燃烧室  发汗冷却  流动特性  流体阻力  数值仿真

Key words:  Thrust chamber  Sweet coolling  Flow characteristic  Fluid drag  Numerical simulation

摘要:

为了研究冷却剂在层板发汗冷却推力室一次调节通道中的流动特性,引入了粗糙粘度μ_R的概念及其计算式,用有效粘度μ₁,eff代替分子粘度μ,导出了冷却剂在一次调节通道中层流流动的N-S方程并对其进行了数值求解。计算结果表明,利用μ₁,eff=μ_R+μ代数模型计算得到的流动结果与试验数据吻合较好,说明冷却剂在D_h≈0.16mm～0.18mm的一次调节通道中层流流动时,可不计微小尺度的效应,但应考虑壁面粗糙度对流动的影响。

Abstract:

In order to study the flow characteristics of the coolant in primary metering groove, the N-S equation suitable for the laminar flow in primary metering groove was obtained by introducing the concept of roughness-viscosity model μR , replacing the viscosity μwith the effect viscosity μ1,eff, and then calculating. The numerical prediction shows that the calculation results obtained from the model μ1,eff =μR +μ are in good agreement with the experimental results. It indicates that, for the coolant laminar flow in the primary metering grooves with the hydraulic diameter Dh≈0.16mm - 0.18mm, the micro-scale effect could be neglected, but the effect of surface roughness on the fluid flow must be considered.