Integration between Measurements and Particle Simulations for Hypersonic Rarefied Flows
The hypersonic rarefied wind tunnel has lately been developed at JAXA. The characteristics of hypersonic rarefied flows have been investigated experimentally and numerically in this work. Using a sphere pendulous model, the test flow has been probed by measuring its displacement due to the aerodynamic force. In addition, a spatial variation of total pressure of the test flow has also been measured by using total pressure tubes. The flow field from a conical nozzle to a test section was simulated by computational fluid dynamics/direct simulation Monte Carlo loosely coupled computations, and the flow fields were deduced by integrating experimental and numerical results. Consequently, a 25 mm hypersonic rarefied core flow was obtained using a 45 degree conical nozzle with a Mach number greater than 10 and a Knudsen number greater than 0.1.