低速二元柔壁自流线型风洞的试验研究

本文简要介绍西北工业大学低速二元柔壁自流线型风洞的设计参数选择与结构特点,空风洞的流场性能、自流线型迭代方案,试验运行程序和初步试验结果。 对于堵塞比ε=13.7％的圆柱体模型和高弦比H/c=1.28的NACA0012翼型零升状态,经2～4次自流线型迭代过程便可收敛得到与国外自修正风洞和有关参考文献一致的无干扰值。

THE EXPERIMENTAL RESEARSH OF LOW SPEED TWO-DIMENTIONAL FLEXIBLE WALL SELF STREAMLINING WIND TUNNEL

A low speed 2-D wind tunnel with flexible wall, self-streamlining test section, has been built at NPU. The present paper expounds the working principle and testing method of the tunnel, the main design characteristics of the flexible-walled test section, pitot-tube measurement of the flow field in the empty tunnel, the considerations of test models and instrumentations. The running program and the calculation method for iterative testings of the 2-D adaptive wind tunnel.The results of the preliminary tests show that, if the relaxation factor is taken between 0.25⁰.60, the test for a cylinder model （e = 13.7%） will converge to the interference-free datum by 2 ⁴ iterations. A procedure for varying the relaxation factor to accelerate the convergence was also studied in the test. For NACA 0012 airfoil model （H/C = 1.28, at a=0）, the results show that, if the relaxation factor is pro-porly chosen, the interference free datum can be achieve by 2 itera tions.