摆盘流动与换热性能数值仿真

针对受燃烧室出口高温燃气冲刷的摆盘装置的冷却水回路,建立二维、三维物理仿真模型,模拟了冷却水在内部流道的 流动与换热过程,考察了冷却水进口压力、冷却水流量对流阻和换热性能的影响.结果表明:①摆盘冷却水进口压力由2.3×105Pa提高到8.3×105Pa,摆盘壁温变化微小,结构1壁温升高5K,结构2壁温升高7K;②冷却水进口速度由0.5m/s提高到5.3m/s,结构1壁温降低约120K,结构2壁温降低约100K,冷却效果明显;③结构2通过缩小流道的流通面积,能在更小的冷却水流量的工况下得到更好的换热效果. 

Numerical simulation of flow and heat transfer performance in turntable

For coolant water path of turntable scoured by hot gas at combustor exit, two-dimensional and three-dimensional physical models of were established to simulate the flow and heat transfer process in internal path. The effect of inlet pressure and mass flow of coolant water on flow resistant and heat transfer performance was investigated. The results show that: (1) increasing inlet pressure of coolant water has little influence on wall temperature of turntable, and the wall temperature of structure 1 increases by 5K and the wall temperature of structure 2 increases by 7K when the inlet pressure of coolant water of turntable increases from 2.3×10⁵Pa to 8.3×10⁵Pa; (2) the wall temperature of structure 1 decreases about 120K and the wall temperature of structure 2 decreases about 100K when the inlet velocity of coolant water increases from 0.5m/s to 5.3m/s; the cooling effect is obvious; (3) shortening passage area of structure 2 will gain better heat transfer effect with the smaller mass flow of coolant water.