基于流场/结构耦合计算的温度场预测技术研究

Research on Temperature Prediction Based on Coupling of Flow Field and Structure

高马赫数飞行器气动加热、红外热辐射、热防护、结构热载荷离不开对飞行器表面的气动热和固体内温度的准确预测,两者之间的耦合作用对此有着重要影响,利用流场/结构耦合传热数值计算就成为一个比较有效的手段。流场部分需要求解非定常N-S方程,时间离散采用双时间步隐式推进;固体部分求解了非稳态的热传导方程;通过流固交界面数据传递实现流场和固体温度场的紧耦合计算。基于此方法对二维带桁架机翼以及高焓风洞喷管的受热特性进行预测,为机翼红外特性预测提供准确温度场数据,评估复合材料喷管应用到高焓风洞建设上来的可能性。

The aerodynamic heating,thermal radiation,thermal protection and thermal load of structure of in high Ma number cannot do well without the accurate predictionon of coupling in fluid and solid. The coupling effect between fluid and solid has a significant impact,and the numerical calculation of coupling fluid and solid becomes a more effective means. The flow field needs to solve the unsteady N-S equation,dual time step method; the solid field needs to solve the unsteady heat conduction equation. The tight coupling calculation is based on the interface data transfer of fluid and solid. Because of this method,the two-dimensional wing and thermal property of high enthalpy wind tunnel nozzle were predicted,providing accurate data for the prediction of infrared characteristics of wing,evaluating the possibility of composite nozzle applied to high enthalpy tunnel construction.