论文部分内容阅读
为了研究某膨胀循环氢氧发动机推力室冷却结构流场分布特性,进行了单根冷却通道和完整冷却通道结构的三维CFD分析。仿真计算过程中,以单根通道模型的仿真结果作为完整通道结构模型流场仿真分析的边界条件之一,并考虑了材料物性参数随温度或压力的变化。分析结果表明:1)仿真预测的温升、压降与热试验实测值吻合,该推力室冷却通道流量相对偏差范围为-4.8%~6.6%,由此造成喉部气壁温的环向偏差为33 K;2)集合器管内流体的环向流动压差、法兰起分流或汇聚作用时拐弯效应形成的压力波动是造成冷却通道流量不均匀分布的主要原因,出口集合器内的压力分布对通道流量分布起主要作用;3)提高通道流量均匀性的措施可以从增大出口集合器管径或采用变管径设计、采用扩口型法兰并设置弧形导流片、集合器的进、出口法兰布置在同一环向位置等方面进行考虑。
In order to study the flow field distribution in the thrust chamber cooling structure of an expansion cycle oxyhydrogen engine, a three-dimensional CFD analysis of the single cooling channel and the complete cooling channel structure was carried out. In the process of simulation calculation, the simulation results of the single-channel model are taken as one of the boundary conditions for the flow field simulation analysis of the complete channel structure model, and the changes of material physical parameters with temperature or pressure are considered. The results show that: 1) The simulated temperature rise and pressure drop are in good agreement with the measured values of the thermal test, and the relative deviation of the cooling channel flow rate in the thrust chamber is -4.8% -6.6%, resulting in circumferential deviation of the gas wall temperature in the throat Is 33 K; 2) The pressure difference between the annular flow in the collector pipe and the pressure fluctuation caused by the turning effect when the flange is shunting or converging is the main reason for the uneven distribution of flow in the cooling passage. The pressure distribution in the outlet collector The channel flow distribution plays a major role; 3) to improve channel flow uniformity measures can be increased from the export collector diameter or variable diameter design, the use of flared flange and set the arc guide vane, the collector’s Import and export flange arrangement in the same location and so on to consider.