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从工程实用观点出发,引入考虑主流紊流度影响的经验关系式,对McNally程序的前驻点、层流区计算方法和转捩模型进行了改进;引入“紊流度帖性”和间歇因子的概念,并综合考虑压力梯度、紊流度和进、出口霄诺数等因素对转捩的影响,对STAN5程序的层流区和过度区计算方法进行了改进。采用相似解方法计算前驻点区的流动和换热,作为STAN5程序的初始条件。用改进的程序,对C3x、MKII,Turner、Daniels和VKI叶型,在多种工况下的二维外边界层流动和换热进行了计算研究。分析和比较了程序中积分法和差分法的特点,总结出一套适用于工程设计计算的方法和程序。
From the perspective of engineering practice, this paper introduces an empirical relation that takes into account the influence of the mainstream turbulence, and improves the pre-stationary point, laminar flow area calculation method and transition model of the McNally program. By introducing the “turbulence signature” and the intermittent factor The influence of pressure gradients, turbulence, inlet and outlet Reynolds numbers and other factors on the transition was comprehensively considered, and the calculation method of laminar flow and over-range in STAN5 program was improved. The similar solution method was used to calculate the flow and heat transfer in the pre-stagnation zone as the initial conditions of the STAN5 program. The improved program was used to study the flow and heat transfer of the two-dimensional outer boundary layer of C3x, MKII, Turner, Daniels and VKI blades under various operating conditions. Analyzed and compared the characteristics of integration method and difference method in the program, summed up a set of methods and procedures for engineering design calculation.