Wind tunnel experiment interference and correction

Author: Cheng Houmei
Publisher:
Publish Date: 2003-01-01
Features: This book focuses on the theoretical and technical aspects of ensuring the quality of wind tunnel test data under "research experiment conditions," and provides methods for evaluating the accuracy of concurrent test data for aircraft model high-angle-of-attack tests, the correlation level of test data between wind tunnels, and the uncertainty assessment of test data. For the wind tunnel test of aircraft models, which involves tunnel wall interference, support structure interference, and Reynolds number effects, the book first introduces the optimization design methods of the test system to correct residual interference. Among these, tunnel wall interference correction methods include classical image methods, Maskell blocking interference correction methods, wall pressure information methods, and some pure numerical computation correction methods. Adaptive wall technology is presented as a method to reduce tunnel wall interference, along with its adjustment principles and experimental techniques. For support structure interference correction, detailed theoretical analysis, experimental techniques, and results are provided, including corrections for model tail booms, belly booms, back supports, and cable support systems. Some experimental results are available for reference in similar interference correction tests. Reference correction methods are also provided for tunnel wall and support structure interference in special tests. From an engineering perspective, the book introduces techniques to eliminate the "false" Reynolds number effect in wind tunnel tests. At low speeds, it provides examples of the impact of Reynolds number on two-dimensional airfoils (including multi-segment airfoils) and three-dimensional wings, as well as correction results from wind tunnel to flight conditions for civil aircraft. At high speeds, it presents simulation methods for Reynolds number effects in wind tunnel tests and extrapolation techniques to flight conditions. It also discusses the impact of Reynolds number on the separation characteristics of the forebody of high-angle-of-attack aircraft, simulation methods, and experimental results. This book is a reference for aerodynamic wind tunnel test engineers, aerodynamic model designers, and graduate students in experimental aerodynamics.