脉冲爆震燃烧室管壁冲击冷却效果的数值研究

根据实验测量的脉冲爆震燃烧室壁温沿程分布,推算出符合脉冲爆震燃烧室特定频率下的准稳态热流阶梯分布;在此基础上,针对叉排阵列射流冲击冷却的脉冲爆震燃烧室壁面温度分布进行了数值计算.研究表明,由于冷却气流通道端壁效应的影响,靠近爆震燃烧室尾部的射流孔的冲击射流速度较大,热流最大的燃烧室尾部管壁的温度可以得到有效的降低,而燃...

Numerical simulation on impingement cooling characteristics of pulsed detonation tube

According to axial wall temperature distributions on pulsed detonation chamber wall measured from experiment,the quasi-steady state heat flux along the detonation tube with ladder distribution was deduced under a specific frequency.Based on the quasi-steady thermal load,a series of computations were conducted to analyze the cooling effects with array jet impingement.The results show that:the jet velocity from rear rows is bigger than that from the front rows due to end wall effects,the cooling action is stronger near the pulsed detonation tube edge,and the impingement cooling effect is worse in the middle part because the impinging jet is weakened by cross-flow forming from the front rows.Under the same cooling flow Reynolds number at circular passage inlet,the array jet holes are reasonably arranged at middle area of pulsed detonation chamber.When the ratio of the impinging space to diameter is 1.5,the cooling effect seems to be best with uniform axial temperature distribution and lowest peak temperature.And smaller diameter of the cooling holes is also beneficial to improving the cooling effects.